CA2915539A1 - Magnesium phosphate based cement, mortar and concrete compositions with increased working time - Google Patents
Magnesium phosphate based cement, mortar and concrete compositions with increased working time Download PDFInfo
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- CA2915539A1 CA2915539A1 CA2915539A CA2915539A CA2915539A1 CA 2915539 A1 CA2915539 A1 CA 2915539A1 CA 2915539 A CA2915539 A CA 2915539A CA 2915539 A CA2915539 A CA 2915539A CA 2915539 A1 CA2915539 A1 CA 2915539A1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
A phosphate-based cement composition comprising: a source of low purity metal oxide, a phosphate component, optionally, a retarder, sufficient amount of water and, optionally, calcium oxide containing material having substantially high amount of amorphous glass content and methods to make such.
Description
MAGNESIUM PHOSPHATE BASED CEMENT, MORTAR AND CONCRETE COMPOSITIONS
WITH INCREASED WORKING TIME
FIELD OF THE INVENTION
The present invention is directed. to a fast setting cement, more specifically a phosphate-based cement using a source of low purity metal oxide, a phosphate component, a retarder, sufficient water and, optionally, calcium oxide containing material, having substantially high amount of amorphous glass content.
BACKGROUND OF THE INVENTION
Known phosphate cements that have been discovered, including the one that was done by Argonne National Laboratories, pioneers in phosphate cements have been significantly (ten times) expensive compared to conventional cements and do not possess the required working time for large volume placement.
This is due to the fact that these compositions Use as much as 30-45% of mono potassium phosphate content which is very expensive ($1900/ ton). and a very high purity metal oxide (more than 95% purity). to the tune of 10-15%. Hence the traditional phosphate cements have always been limited to the application of concrete road repair where the volume is less and more working time is not required.
To extend the.. working time of the phosphate cements would mean that it would allow one to use these type of cements- for larger area applications like underlayment or overlayment of concrete floorings or for normal construction of buildings itself. This concept was attempted numerous times by different groups by adopting different techniques like usage of retarders like borax or using metal oxides calcined at higher temperatures. However, all of these techniques failed to give a desired working time because the resulting cement set very fast which made them impractical to be used for large area applications.
US patent No. 6,136,088 discloses ahigh early strength binder based on phosphate cement utilizing a maximum binder level of 58%, which avoids the evolution of ammonia gas in its preparation by reacting mono ammonium phosphate with potassium carbonate and a process for preparing a .cementitious binder useful in a quick setting mortar, whose utilityincludes a repair material for cementitious structures. The binding system is based on the formation of potassium struvite, by reacting a source of high purity magnesium oxide with potassium phosphate and water. Although still quick setting, the set time of this binder is slower than the set time of struvite.
US patent No. 7,001,860 discloses an inexpensive construction material, adapted for use in warm weather climates where styrofoam or other synthetic organic resin foams are used as construction materials and require a coating of a hard, dense material for a surface finish and a method to coat styrofoam structures with a material which cures or sets at room temperature and is easy to apply in the field.
=
US patent No. 7,204,880 discloses a cement formula utilizing the metal oxide along with mono potassium phosphate and mono ammonium phosphate but uses a very small amount of it because of the use of high purity metal oxide. lithe percentage of mono ammonium phosphate is increased the final cement sets faster making rendering it impractical for large area applications.
As seen from the above, some of the drawbacks of cements of the prior art include quick setting and less working time. llenee used for limited applications like road patching;
high cost (due to the use of high quantities of expensive low solubility acid phosphates); and the sensitivity, to increase in water/cement ratio.
In light of the prior art, there exists a need for a low cost phosphate-based cement composition with high mechanical properties and the present .invention relates to the method of producing a structural material with an improved workability to be used in the infrastructure development.
After years of experimentation the inventors have found that the failure wasattributed to the purity of magnesium oxide used.
It was unexpectedly and surprisingly found that by lowering the purity of metal oxides by adding other compounds like silicate or aluminate, the loading of metal oxides can be increased and the loading of phosphates can be decreased thereby reducing the cost of the final binder and extend the working time of the cement so that it can be used for many other applications other than road repair. By replacing metal oxides with metal silicates it is possible to extend the working time and replace expensive a portion or all of the mono potassium phosphate with a cheaper phosphate source such as mono ammonium phosphate. Thereby reducing the cost and achieving a greater working time to be able to be used for wider applications as compared to the disclosed prior art.
SUMMARY OF THE INVENTION
According to a preferred embodiment of the present invention, there is provided a method of producing fast setting phosphate-based cement, using a .source of low purity metal oxide, a phosphate component, a retarder, a sufficient quantity of water and optionally, a source of calcium oxide containing material having a substantially high amount of amorphous glass content.
According to a preferred embodiment of the present invention, the phosphate cement comprising a source of low purity metal oxides can also overcome the working time -issue by using low purity metal oxides in combination with retarders such as an alkali metal stannate or an alkali metal fluoride. According to a preferred embodiment of the present invention, the water resistance is improved by the use of amorphous calcium oxide containing material. According to a preferred embodiment of the present invention, the use of
WITH INCREASED WORKING TIME
FIELD OF THE INVENTION
The present invention is directed. to a fast setting cement, more specifically a phosphate-based cement using a source of low purity metal oxide, a phosphate component, a retarder, sufficient water and, optionally, calcium oxide containing material, having substantially high amount of amorphous glass content.
BACKGROUND OF THE INVENTION
Known phosphate cements that have been discovered, including the one that was done by Argonne National Laboratories, pioneers in phosphate cements have been significantly (ten times) expensive compared to conventional cements and do not possess the required working time for large volume placement.
This is due to the fact that these compositions Use as much as 30-45% of mono potassium phosphate content which is very expensive ($1900/ ton). and a very high purity metal oxide (more than 95% purity). to the tune of 10-15%. Hence the traditional phosphate cements have always been limited to the application of concrete road repair where the volume is less and more working time is not required.
To extend the.. working time of the phosphate cements would mean that it would allow one to use these type of cements- for larger area applications like underlayment or overlayment of concrete floorings or for normal construction of buildings itself. This concept was attempted numerous times by different groups by adopting different techniques like usage of retarders like borax or using metal oxides calcined at higher temperatures. However, all of these techniques failed to give a desired working time because the resulting cement set very fast which made them impractical to be used for large area applications.
US patent No. 6,136,088 discloses ahigh early strength binder based on phosphate cement utilizing a maximum binder level of 58%, which avoids the evolution of ammonia gas in its preparation by reacting mono ammonium phosphate with potassium carbonate and a process for preparing a .cementitious binder useful in a quick setting mortar, whose utilityincludes a repair material for cementitious structures. The binding system is based on the formation of potassium struvite, by reacting a source of high purity magnesium oxide with potassium phosphate and water. Although still quick setting, the set time of this binder is slower than the set time of struvite.
US patent No. 7,001,860 discloses an inexpensive construction material, adapted for use in warm weather climates where styrofoam or other synthetic organic resin foams are used as construction materials and require a coating of a hard, dense material for a surface finish and a method to coat styrofoam structures with a material which cures or sets at room temperature and is easy to apply in the field.
=
US patent No. 7,204,880 discloses a cement formula utilizing the metal oxide along with mono potassium phosphate and mono ammonium phosphate but uses a very small amount of it because of the use of high purity metal oxide. lithe percentage of mono ammonium phosphate is increased the final cement sets faster making rendering it impractical for large area applications.
As seen from the above, some of the drawbacks of cements of the prior art include quick setting and less working time. llenee used for limited applications like road patching;
high cost (due to the use of high quantities of expensive low solubility acid phosphates); and the sensitivity, to increase in water/cement ratio.
In light of the prior art, there exists a need for a low cost phosphate-based cement composition with high mechanical properties and the present .invention relates to the method of producing a structural material with an improved workability to be used in the infrastructure development.
After years of experimentation the inventors have found that the failure wasattributed to the purity of magnesium oxide used.
It was unexpectedly and surprisingly found that by lowering the purity of metal oxides by adding other compounds like silicate or aluminate, the loading of metal oxides can be increased and the loading of phosphates can be decreased thereby reducing the cost of the final binder and extend the working time of the cement so that it can be used for many other applications other than road repair. By replacing metal oxides with metal silicates it is possible to extend the working time and replace expensive a portion or all of the mono potassium phosphate with a cheaper phosphate source such as mono ammonium phosphate. Thereby reducing the cost and achieving a greater working time to be able to be used for wider applications as compared to the disclosed prior art.
SUMMARY OF THE INVENTION
According to a preferred embodiment of the present invention, there is provided a method of producing fast setting phosphate-based cement, using a .source of low purity metal oxide, a phosphate component, a retarder, a sufficient quantity of water and optionally, a source of calcium oxide containing material having a substantially high amount of amorphous glass content.
According to a preferred embodiment of the present invention, the phosphate cement comprising a source of low purity metal oxides can also overcome the working time -issue by using low purity metal oxides in combination with retarders such as an alkali metal stannate or an alkali metal fluoride. According to a preferred embodiment of the present invention, the water resistance is improved by the use of amorphous calcium oxide containing material. According to a preferred embodiment of the present invention, the use of
2 a high amount of tow cost high solubility phosphate provides for a cost effective cement composition.
According to a preferred embodiment; the mechanical properties of the cement are improved by the use of calcium oxide containing .fillers having amorphous glass content.
According to a preferred embodiment of the present invention, the novel cement with good strength coupled with improved flowability and increased working time and mechanical properties is produced by mixing the right proportions of metal oxide or a source of low purity metal oxide, an industrial waste containing a source of silica which can include fly ash, steel slag, ground granulated blast furnace slag (GGBFS), and a phosphate component, and a retarder with sufficient water. The resulting cement does not involve clinkering. More particularly, a preferred embodiment of the present invention is directed to overcoming the problem of poor water resistance, increased cost and lack of working time of traditional phosphate cements which has been the main hindrance to the widespread use of such cements.
The setting time of the final cement depends upon the amount of metal cations released from the metal oxide to be able to react with phosphate anions when water is added to the cement. If the amount of metal cations released is higher in a given period of time then the cements sets faster. If the release of the cations can be controlled, the setting can be controlled. .One of the ways to do it is by increasing the calcination temperature of metal oxides or the having other compounds along with the metal oxides which will lower the amount of metal oxide getting released. Examples of such compounds are silicates and aluminates, which can be represented as IVIgSiO3 and .MgA1204. As far as the chemical composition of the metal oxide is concerned it is preferred to have a non stoichiometric metal oxide silicates or aluminates in order to obtain better results. The non stoichiometric metal oxide silicates can be represented as MgO,Si02 0-20 and the metal oxide aluminate can be represented as MgO,Al2030,0.
Reactivity of magnesium oxide depends on its morphology and its chemical composition. Highly crystalline oxide is also the least soluble in the phosphate solution (the crystals are called periclase) and it is achieved by increasing the temperature of calcination. Due to the low solubility of these crystals, the mixing and application time of the resulting cement is expected to be longer than that without this crystal morphology. Using this lower purity (thus, less reactive) magnesium oxide or magnesium silicate, it may be then possible to reduce the content of the phosphate by increasing the content of this magnesium oxide. By reducing the content of the phosphate in the total binder the cost of the cement is consequently reduced as the former is a high cost component in the binder. The binder here is referred as the combination of metal oxide or metal silicate, metal aluminate and the phosphate component. The cement forming reaction between 100%
magnesium oxide and mono potassium phosphate can be expressed as:
According to a preferred embodiment; the mechanical properties of the cement are improved by the use of calcium oxide containing .fillers having amorphous glass content.
According to a preferred embodiment of the present invention, the novel cement with good strength coupled with improved flowability and increased working time and mechanical properties is produced by mixing the right proportions of metal oxide or a source of low purity metal oxide, an industrial waste containing a source of silica which can include fly ash, steel slag, ground granulated blast furnace slag (GGBFS), and a phosphate component, and a retarder with sufficient water. The resulting cement does not involve clinkering. More particularly, a preferred embodiment of the present invention is directed to overcoming the problem of poor water resistance, increased cost and lack of working time of traditional phosphate cements which has been the main hindrance to the widespread use of such cements.
The setting time of the final cement depends upon the amount of metal cations released from the metal oxide to be able to react with phosphate anions when water is added to the cement. If the amount of metal cations released is higher in a given period of time then the cements sets faster. If the release of the cations can be controlled, the setting can be controlled. .One of the ways to do it is by increasing the calcination temperature of metal oxides or the having other compounds along with the metal oxides which will lower the amount of metal oxide getting released. Examples of such compounds are silicates and aluminates, which can be represented as IVIgSiO3 and .MgA1204. As far as the chemical composition of the metal oxide is concerned it is preferred to have a non stoichiometric metal oxide silicates or aluminates in order to obtain better results. The non stoichiometric metal oxide silicates can be represented as MgO,Si02 0-20 and the metal oxide aluminate can be represented as MgO,Al2030,0.
Reactivity of magnesium oxide depends on its morphology and its chemical composition. Highly crystalline oxide is also the least soluble in the phosphate solution (the crystals are called periclase) and it is achieved by increasing the temperature of calcination. Due to the low solubility of these crystals, the mixing and application time of the resulting cement is expected to be longer than that without this crystal morphology. Using this lower purity (thus, less reactive) magnesium oxide or magnesium silicate, it may be then possible to reduce the content of the phosphate by increasing the content of this magnesium oxide. By reducing the content of the phosphate in the total binder the cost of the cement is consequently reduced as the former is a high cost component in the binder. The binder here is referred as the combination of metal oxide or metal silicate, metal aluminate and the phosphate component. The cement forming reaction between 100%
magnesium oxide and mono potassium phosphate can be expressed as:
3 MgO + KI-12PO4 + 5H20 Mgl(PO4.6H20 -------------------- = (I) Based on the, above cement forming equation (1), the molecular weight ratio of metal oxide:
phosphate would ideally have to be 40 grams: 136 grams (I 3.2). This ratio not only makes the price of the binder high but also results in a quick setting composition. In an effort to reduce the price of the binder, a slight increase (of as little as 10%) in the high purity metal oxide, weight releases more cations in the mix which renders the cement fast setting, hence unsuitable for certain practical applications.
The cement forming reaction when using a low purity metal oxide with silicate may be written as:
Mg0xSi02 0,0 + + 51120 -->MgO,Si02 (1.õ) KPO4.61420 (2).
- Magnesium potassium phosphate, the final product formed due to the chemical reaction between magnesium oxide and mono potassium phosphate has a solubility product constant of 24X. I tr" and gets converted into Mg3(PO4)2 when immersed in water for a prolonged period of time accompanied by a drop in the mechanical properties making. it unusable in areas where prolonged water immersion is expected. It was found after an extensive period of testing with various fillers along with binder (magnesium silicate +
phosphate component) that by having a suitable magnesium oxide/silicate:
phosphate component ratio, the water resistance of these phosphate cements are greatly increased.
DETAILED DESCRIPTION OF THE INVENTION
According to a preferred embodiment of the present invention, a preferred embodiment of the present invention comprises a source. of low purity metal oxide (<85% purity) or similar material such as magnesium silicate or magnesium aluminate. This source of low purity metal oxide is preferably present in the range of 20-55% by weight of the total composition. This source of low purity metal oxide is more preferably present in the range of 25-45%. This source of low purity metal oxide is even more preferably present in the range of 30-40%. The preferred form of metal oxide is magnesium oxide.
The phosphate component is selected from the group consisting of: a low solubility acid phosphate; a high solubility acid phosphate, and combinations thereof. The low solubility acid phosphate (such as mono potassium phosphate) is preferably present in an amount ranging from I to 45%
by weight of the total composition; and when present, the high solubility acid phosphate (such as mono ammonium phosphate) is preferably present in an amount ranging from I to 20% by weight of the total composition, more preferably from 1 to 15% and even more prefereably from 1 to 5%. Preferably, the total content of phosphate component will range of 20-55% by weight of the total composition. More preferably, the phosphate
phosphate would ideally have to be 40 grams: 136 grams (I 3.2). This ratio not only makes the price of the binder high but also results in a quick setting composition. In an effort to reduce the price of the binder, a slight increase (of as little as 10%) in the high purity metal oxide, weight releases more cations in the mix which renders the cement fast setting, hence unsuitable for certain practical applications.
The cement forming reaction when using a low purity metal oxide with silicate may be written as:
Mg0xSi02 0,0 + + 51120 -->MgO,Si02 (1.õ) KPO4.61420 (2).
- Magnesium potassium phosphate, the final product formed due to the chemical reaction between magnesium oxide and mono potassium phosphate has a solubility product constant of 24X. I tr" and gets converted into Mg3(PO4)2 when immersed in water for a prolonged period of time accompanied by a drop in the mechanical properties making. it unusable in areas where prolonged water immersion is expected. It was found after an extensive period of testing with various fillers along with binder (magnesium silicate +
phosphate component) that by having a suitable magnesium oxide/silicate:
phosphate component ratio, the water resistance of these phosphate cements are greatly increased.
DETAILED DESCRIPTION OF THE INVENTION
According to a preferred embodiment of the present invention, a preferred embodiment of the present invention comprises a source. of low purity metal oxide (<85% purity) or similar material such as magnesium silicate or magnesium aluminate. This source of low purity metal oxide is preferably present in the range of 20-55% by weight of the total composition. This source of low purity metal oxide is more preferably present in the range of 25-45%. This source of low purity metal oxide is even more preferably present in the range of 30-40%. The preferred form of metal oxide is magnesium oxide.
The phosphate component is selected from the group consisting of: a low solubility acid phosphate; a high solubility acid phosphate, and combinations thereof. The low solubility acid phosphate (such as mono potassium phosphate) is preferably present in an amount ranging from I to 45%
by weight of the total composition; and when present, the high solubility acid phosphate (such as mono ammonium phosphate) is preferably present in an amount ranging from I to 20% by weight of the total composition, more preferably from 1 to 15% and even more prefereably from 1 to 5%. Preferably, the total content of phosphate component will range of 20-55% by weight of the total composition. More preferably, the phosphate
4 component is present. in the range of 25-45%. Even more preferably, the phosphate component is present in the range of 30-40%.
Material containing calcium oxide in the range of 1-50% and having high amorphous glass content includes materials selected from the group consisting of: fly ash, ground granulated blast furnace slag and steel slag. More preferred is fly ash. When present, such material is preferably present in an amount ranging from 15 to 45% by weight of the total composition. More preferably, this material is present from 15 to 25 A by weight of the total composition.
Preferably, the ratio of MgO:phosphate.component should range between 0.6: 1 to 1.5: 1.
According to a preferred embodiment of the present invention, fibers are added to the cement composition in order to increase the flexural strength of the resulting cement. Preferably, the fibers are selected from the group consisting of: glass fibers (preferably 3mm long);
polypropylene fibers; and basalt fibers. Most preferred are glass fibers. Pigments such as titanium dioxide can be added to impart a white tone to the cement. Typically, the presence of pigments ranges from 1 to 5%
but can be reasonably adjusted to more or less than this range in order to obtain the desired color or tone while substantially maintaining the physical characteristics required of the cement To allow for longer working (setting) time, of cement compositions, retarders are generally used.
According to a preferred embodiment of the present invention retarders are selected from the group consisting of: alkali metal fluoride; alkali metal stannate; borax and combinations thereof'. More preferably, an alkali metal fluoride such as sodium fluoride is used: in another preferred embodiment, an alkali metal stannate such as sodium stannate is used. When present as retarder, the alkali metal fluoride such as sodium fluoride is preferably present in an amount ranging from 0.1 to 10% by weight of the total composition, more preferably from I to 5%. When present as retarder, the alkali metal stannate such as sodium stannate is preferably present in an amount ranging from 0.1 to 10 % and more preferably from 1 to 5% by weight of the total composition. When present as retarder, borax is preferably present in an amount ranging from 0.1 to 10 % and more preferably from Ito 5% by weight of the total composition.
As understood by the person of ordinary skill in the art, the amount of water used in the cement composition should generally be half the amount of hinder. Of course, the person of ordinary skill in the art will know that the amount of water can be varied within a reasonable range to optimize the cement pertbrmance (setting time and strength) without departing from the scope of the present invention. Ideally,
Material containing calcium oxide in the range of 1-50% and having high amorphous glass content includes materials selected from the group consisting of: fly ash, ground granulated blast furnace slag and steel slag. More preferred is fly ash. When present, such material is preferably present in an amount ranging from 15 to 45% by weight of the total composition. More preferably, this material is present from 15 to 25 A by weight of the total composition.
Preferably, the ratio of MgO:phosphate.component should range between 0.6: 1 to 1.5: 1.
According to a preferred embodiment of the present invention, fibers are added to the cement composition in order to increase the flexural strength of the resulting cement. Preferably, the fibers are selected from the group consisting of: glass fibers (preferably 3mm long);
polypropylene fibers; and basalt fibers. Most preferred are glass fibers. Pigments such as titanium dioxide can be added to impart a white tone to the cement. Typically, the presence of pigments ranges from 1 to 5%
but can be reasonably adjusted to more or less than this range in order to obtain the desired color or tone while substantially maintaining the physical characteristics required of the cement To allow for longer working (setting) time, of cement compositions, retarders are generally used.
According to a preferred embodiment of the present invention retarders are selected from the group consisting of: alkali metal fluoride; alkali metal stannate; borax and combinations thereof'. More preferably, an alkali metal fluoride such as sodium fluoride is used: in another preferred embodiment, an alkali metal stannate such as sodium stannate is used. When present as retarder, the alkali metal fluoride such as sodium fluoride is preferably present in an amount ranging from 0.1 to 10% by weight of the total composition, more preferably from I to 5%. When present as retarder, the alkali metal stannate such as sodium stannate is preferably present in an amount ranging from 0.1 to 10 % and more preferably from 1 to 5% by weight of the total composition. When present as retarder, borax is preferably present in an amount ranging from 0.1 to 10 % and more preferably from Ito 5% by weight of the total composition.
As understood by the person of ordinary skill in the art, the amount of water used in the cement composition should generally be half the amount of hinder. Of course, the person of ordinary skill in the art will know that the amount of water can be varied within a reasonable range to optimize the cement pertbrmance (setting time and strength) without departing from the scope of the present invention. Ideally,
5 the working time of the cement according to a preferred embodiment of the present invention will be ten minutes or more.
It is understood that the cements according to the present invention can be used to make concretes by the addition of various types of aggregates commonly used in the field. These include fine granular sand such as quartz sand (of 3mm size) as well as rock aggregates (such as 20mm stones). It is also understood that the cements according to the present invention can be used to make, mortars by the addition of various types of .fine granular material such as sand commonly used in .the field. The purposes disclosed herein are understood to be examples of the breadth of use the present invention can be applied and should not be construed to be limited to such.
The following examples. are included to illustrate the present invention and are not to be considered limiting thereof. In each of the examples, the amount of water was carefully controlled, as would be understood by the. person Of ordinary skill in the art, to ensure an efficient mixing and reaction and also to ensure that the cement created was of sufficient strength. The person skilled in the art will understand the scope of the invention is defined by the claims appended hereto.
Example 1 A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
- Magnesium silicate having a MgO content of 84%
- and Si02 content of 12.5% ¨446 g =
- MKP-364 g - M.AP ¨ 20 g - Fly Ash ¨ 1.70 g - Borax 20 g - Sand ¨ 2000 g - 20 mm Aggregates ¨ 4000 g - Water ¨400 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 100 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 25 minutes and the final setting time was 40 minutes. The slump was recorded to
It is understood that the cements according to the present invention can be used to make concretes by the addition of various types of aggregates commonly used in the field. These include fine granular sand such as quartz sand (of 3mm size) as well as rock aggregates (such as 20mm stones). It is also understood that the cements according to the present invention can be used to make, mortars by the addition of various types of .fine granular material such as sand commonly used in .the field. The purposes disclosed herein are understood to be examples of the breadth of use the present invention can be applied and should not be construed to be limited to such.
The following examples. are included to illustrate the present invention and are not to be considered limiting thereof. In each of the examples, the amount of water was carefully controlled, as would be understood by the. person Of ordinary skill in the art, to ensure an efficient mixing and reaction and also to ensure that the cement created was of sufficient strength. The person skilled in the art will understand the scope of the invention is defined by the claims appended hereto.
Example 1 A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
- Magnesium silicate having a MgO content of 84%
- and Si02 content of 12.5% ¨446 g =
- MKP-364 g - M.AP ¨ 20 g - Fly Ash ¨ 1.70 g - Borax 20 g - Sand ¨ 2000 g - 20 mm Aggregates ¨ 4000 g - Water ¨400 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 100 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 25 minutes and the final setting time was 40 minutes. The slump was recorded to
6 be 160 mm. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example I are listed below:
2 Hours ¨ 3.6 Mpa Day¨ 1.8.4 Mpa 3 Days -19.8 Mpa
2 Hours ¨ 3.6 Mpa Day¨ 1.8.4 Mpa 3 Days -19.8 Mpa
7 Days ¨23 Mpa 28 Days ¨27 MPti Example 2 A concrete comprising a cetnentitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and Si02 content of 12.5% ¨400 g MKP 380 g MAP 20 g Ely Ash ¨ 180 g-Borax ¨ 20 g Sand ¨ 1000 g (Quartz sand having 3 mm size) Water ¨ 220 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 nun were cast, their .setting times were recorded and the hardness was measured. The initial setting time was of 3 minutes and the final setting time was 10 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 2 are listed below:
2 Hours ¨ 18 Mpa 1 Day ¨ 35 Mpa 3 Days -38.4 Mpa 7 Days ¨45 Mpa 28 Days ¨ 53A Mpa Example 3 A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and Si02 content of 12.5% ¨ 400 g MKP-380 g MAP¨ 20 g Fly Ash ¨ 180 g Sodium Stannate ¨50 g Sand ¨ 1000 g Water ¨220 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 10 minutes and the final setting time was 20 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 3 are listed below:
2 Hours ¨ 16.9 Mpa I Day ¨ 34.5 .Mpa 3 Days ¨36 Mpa 7 Days 43.7 Mpa 28 Days ¨49.2 Mpa Example 4 A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according tothe following formula:
Magnesium silicate having a MgO content of 84%
and SiO2 content of 115% ¨ 400 g = MKP ¨ 380 g MAP 20 g Fly Ash ¨ 180 g Sodium Fluoride¨SO g Sand ¨ 1000 g
Magnesium silicate having a MgO content of 84%
and Si02 content of 12.5% ¨400 g MKP 380 g MAP 20 g Ely Ash ¨ 180 g-Borax ¨ 20 g Sand ¨ 1000 g (Quartz sand having 3 mm size) Water ¨ 220 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 nun were cast, their .setting times were recorded and the hardness was measured. The initial setting time was of 3 minutes and the final setting time was 10 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 2 are listed below:
2 Hours ¨ 18 Mpa 1 Day ¨ 35 Mpa 3 Days -38.4 Mpa 7 Days ¨45 Mpa 28 Days ¨ 53A Mpa Example 3 A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and Si02 content of 12.5% ¨ 400 g MKP-380 g MAP¨ 20 g Fly Ash ¨ 180 g Sodium Stannate ¨50 g Sand ¨ 1000 g Water ¨220 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 10 minutes and the final setting time was 20 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 3 are listed below:
2 Hours ¨ 16.9 Mpa I Day ¨ 34.5 .Mpa 3 Days ¨36 Mpa 7 Days 43.7 Mpa 28 Days ¨49.2 Mpa Example 4 A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according tothe following formula:
Magnesium silicate having a MgO content of 84%
and SiO2 content of 115% ¨ 400 g = MKP ¨ 380 g MAP 20 g Fly Ash ¨ 180 g Sodium Fluoride¨SO g Sand ¨ 1000 g
8 Water 220 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 12 minutes and the final setting time was 20 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 4 are listed below:
2 Hours ¨ 15.8 Mpa .1 Day ¨ 31 Mpa 3 Days ¨37 Mpa 7 Days- 43.1 Mpa 28 Days ¨47 Mpa Example 5 A concrete comprising a. cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content o114%
and Si02 content of 12.5% ¨230 g M.KP ¨ 115 g MAP¨ 115.g Fly Ash 286g Borax ¨8 g Fibers.¨ 3 g Ti02 ¨ 38 g Sand¨ 1500 g Water ¨210 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 5 minutes. and the final setting time was 10 minutes. The cement hardness was
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 12 minutes and the final setting time was 20 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 4 are listed below:
2 Hours ¨ 15.8 Mpa .1 Day ¨ 31 Mpa 3 Days ¨37 Mpa 7 Days- 43.1 Mpa 28 Days ¨47 Mpa Example 5 A concrete comprising a. cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content o114%
and Si02 content of 12.5% ¨230 g M.KP ¨ 115 g MAP¨ 115.g Fly Ash 286g Borax ¨8 g Fibers.¨ 3 g Ti02 ¨ 38 g Sand¨ 1500 g Water ¨210 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 5 minutes. and the final setting time was 10 minutes. The cement hardness was
9 monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 5 are listed below:
3 Hours 18.6 Mpa 1 Day ¨ 24 Mpa 3 Days 26 Mpa 7 Days ¨ 28.9 Mpa 28 Days ¨ 37 Mpa Example 6 A cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and Si02 content of 12.5% ¨ 253 g M.KP ¨ 213 g MAP 40 g Fly Ash ¨433 g Quartz sand powder ¨66 g Water ¨ 210 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 3 minutes and the final setting time was 5 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 6 are listed below:
2 Hours ¨ 5 Mpa I Day ¨ 16. Mpa 3 Days¨ 18.7 Mpa 7 Days ¨ 21.3 Mpa 28 Days 26 Mpa Example 7 . A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and a S102 content of 12.5% ¨ 245 g MKP-410 g Sand Powder ¨ 267 g Borax ¨ 58 g TDO- 20 g Sand ¨ 2000 g Water ¨ 260 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 20 minutes and the final setting time was 30 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 7 are listed below:
2 Hours ¨4 inpa 1 Day¨ 14.3 Mpa 3 Days 19.6 Mpa 7 Days 22 Mpa 28 Days ¨29.6 Mpa Table 1 - Weight content of each component for the cement composition of Examples 1 to 7 (in grams) component 1 2 3 4 5 6 7 Magnesium silicate having a MgO content 446 400 400 400 230 253 245 of 84% and Si02 content of 12.5%
MKP 364 380 380 380 ¨ 115 213 410 Fly ash 170 180 180 180 286 433 X
Borax 20 20 X X 8 X 58 -Na Stannate X X 50 X X X X
NaF X X X 50 X X X
Fiber X X X X 3 X X
sand powder X ' X X X X 66 267 Total 1020 1.000 1030 1030 795 1005 1000 , Table 2- Percentage content of each component of the cement composition of Examples 1 to 7 Component 1 2 3 4 5 6 7 Magnesium silicate having a MgO Content of 43.73 40.00 38.83 38.83 28.93 25.17 24.50 84% and Si% content of 12.5%
MKP 35.69 ' 38.00 36.89 36.89 14.47 21.19 41.00 MAP 1.96 2.00 1.94 1.94 14.47 3.98 0.00 Fly aih------ 16.67 18.00 17.48 17.48 ' 35.97 43.08 ' 0.00 Borax ' 1.96 - 2.00 ' 0.00 0.00 1.01 0.00 5.80 Na Stannate 0.00 0.00 4.85 ' 0.00 0.00 0.00 0.00 ....____ NaF 0.00 0.00 0.00 4.85 0.00 0.00 0.00 Fiber 0.00 0.00 0.00 0.00 4 0.38 0.00 0.00 iDo 0.00 0.00 0,00 0.00 4.78 0.00 2.00 sand powder 0.00 ' 0.00 0.00 0.00 0.00 6.57 26.70
3 Hours 18.6 Mpa 1 Day ¨ 24 Mpa 3 Days 26 Mpa 7 Days ¨ 28.9 Mpa 28 Days ¨ 37 Mpa Example 6 A cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and Si02 content of 12.5% ¨ 253 g M.KP ¨ 213 g MAP 40 g Fly Ash ¨433 g Quartz sand powder ¨66 g Water ¨ 210 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 3 minutes and the final setting time was 5 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 6 are listed below:
2 Hours ¨ 5 Mpa I Day ¨ 16. Mpa 3 Days¨ 18.7 Mpa 7 Days ¨ 21.3 Mpa 28 Days 26 Mpa Example 7 . A concrete comprising a cementitious composition according to a preferred embodiment of the present invention was prepared according to the following formula:
Magnesium silicate having a MgO content of 84%
and a S102 content of 12.5% ¨ 245 g MKP-410 g Sand Powder ¨ 267 g Borax ¨ 58 g TDO- 20 g Sand ¨ 2000 g Water ¨ 260 ml All the powder components were mixed first and water was then added and mixed in a mixer. Then sand was then added and the resulting mixture was mixed for another 10 minutes.
Cubes of 70.6 mm were cast, their setting times were recorded and the hardness was measured. The initial setting time was of 20 minutes and the final setting time was 30 minutes. The cement hardness was monitored and recorded over a range of time of up to 4 weeks. The results of the hardness testing for Example 7 are listed below:
2 Hours ¨4 inpa 1 Day¨ 14.3 Mpa 3 Days 19.6 Mpa 7 Days 22 Mpa 28 Days ¨29.6 Mpa Table 1 - Weight content of each component for the cement composition of Examples 1 to 7 (in grams) component 1 2 3 4 5 6 7 Magnesium silicate having a MgO content 446 400 400 400 230 253 245 of 84% and Si02 content of 12.5%
MKP 364 380 380 380 ¨ 115 213 410 Fly ash 170 180 180 180 286 433 X
Borax 20 20 X X 8 X 58 -Na Stannate X X 50 X X X X
NaF X X X 50 X X X
Fiber X X X X 3 X X
sand powder X ' X X X X 66 267 Total 1020 1.000 1030 1030 795 1005 1000 , Table 2- Percentage content of each component of the cement composition of Examples 1 to 7 Component 1 2 3 4 5 6 7 Magnesium silicate having a MgO Content of 43.73 40.00 38.83 38.83 28.93 25.17 24.50 84% and Si% content of 12.5%
MKP 35.69 ' 38.00 36.89 36.89 14.47 21.19 41.00 MAP 1.96 2.00 1.94 1.94 14.47 3.98 0.00 Fly aih------ 16.67 18.00 17.48 17.48 ' 35.97 43.08 ' 0.00 Borax ' 1.96 - 2.00 ' 0.00 0.00 1.01 0.00 5.80 Na Stannate 0.00 0.00 4.85 ' 0.00 0.00 0.00 0.00 ....____ NaF 0.00 0.00 0.00 4.85 0.00 0.00 0.00 Fiber 0.00 0.00 0.00 0.00 4 0.38 0.00 0.00 iDo 0.00 0.00 0,00 0.00 4.78 0.00 2.00 sand powder 0.00 ' 0.00 0.00 0.00 0.00 6.57 26.70
Claims (36)
1. A phosphate-based fast setting cement composition comprising:
- a source of low purity metal oxide;
- a phosphate component selected from the group consisting of: a high solubility acid phosphate, a low solubility acid phosphate and a combination thereof;
- a material containing calcium oxide and having a high amorphous glass content;
- a retarder; and - a sufficient amount of water.
- a source of low purity metal oxide;
- a phosphate component selected from the group consisting of: a high solubility acid phosphate, a low solubility acid phosphate and a combination thereof;
- a material containing calcium oxide and having a high amorphous glass content;
- a retarder; and - a sufficient amount of water.
2. The cement composition according to claim 1 wherein the source of low purity metal oxide has a metal oxide content of less than 85%.
3. The cement composition according to claim 1 or 2 wherein the source of low purity metal oxide is selected from the group consisting of: magnesium silicate, magnesium aluminate and a combination thereof.
4. The cement composition according to claim 3 wherein the source of low purity metal oxide is magnesium silicate.
5. The cement composition according to any one of claims 1 to 4 wherein the ratio of metal oxide :
phosphate component ranges between 0.5 : 1 to 1.8 : 1.
phosphate component ranges between 0.5 : 1 to 1.8 : 1.
6. The cement composition according to any one of claims 1 to 4 wherein the ratio of metal oxide :
phosphate component ranges between 0.6 : 1 to 1.5 : 1.
phosphate component ranges between 0.6 : 1 to 1.5 : 1.
7. The cement composition according to any one of claims 1 to 6 wherein the source of low purity metal oxide is present in the range of about 20 to 55% by weight of the total weight of the composition.
8. The cement composition according to any one of claims 1 to 7 wherein the phosphate component is present in the range of about 20 to 50 % by weight of the total weight of the composition.
9. The cement composition according to any one of claims 1 to 7 wherein the phosphate component is present in the range of about 25 to 45 % by weight of the total weight of the composition.
10. The cement composition according to any one of claims 1 to 7 wherein the phosphate component is present in the range of about 30 to 40 % by weight of the total weight of the composition.
11. The cement composition according to any one of claims 1 to 10 wherein the material containing calcium oxide and having a high amorphous glass content is present in an amount ranging from 1.5 to 45 % by weight of the total weight of the composition.
12. The cement composition according to any one of claims 1 to 10 wherein the material containing calcium.
oxide and having a high amorphous glass content is present in an amount ranging from 15 to 25 % by weight of the total weight of the composition.
oxide and having a high amorphous glass content is present in an amount ranging from 15 to 25 % by weight of the total weight of the composition.
13. The cement composition according to any one of claims 1 to 12 wherein the material containing calcium oxide and having a high amorphous glass content is ground blast furnace slag.
14. The cement composition according to any one of claims 1 to 12 wherein the material containing calcium oxide and having a high amorphous glass content is fly ash.
15. The cement composition according to any one of claims 1 to 14 wherein the retarder is selected from the group consisting of: alkali metal fluoride; alkali metal stannate; borax and combinations thereof.
16. The cement composition according to claim 15 wherein the alkali metal fluoride is sodium fluoride.
17. The cement composition according to claim 15 wherein the alkali metal stannate is sodium stannate.
18. The cement composition to any one of claims 1 to 17 wherein the retarder is present in an amount ranging from 1 to 10%.
19. The cement composition according to claim 18 wherein the retarder is present in an amount ranging from 1 to 5%.
20. The cement composition according to any one of claims 1 to 19 wherein the low solubility acid phosphate is mono potassium phosphate.
21. The cement composition according to claim 20 wherein the mono potassium phosphate is present in an amount ranging from 5 to 45% by weight of the total composition.
22. The cement composition according to claim 21 wherein the mono potassium phosphate is present in an amount ranging from 10 to 40% by weight of the total composition.
23 The cement composition according to claim 22 wherein the mono potassium phosphate is present in an amount ranging from 30 to 40% by weight of the total composition.
24. The cement composition according to any one of claims 1 to 23 wherein the high solubility acid phosphate is mono ammonium phosphate
25. The cement composition according to claim 24 wherein the mono ammonium phosphate is present in an amount ranging from 1 to 20% by weight of the total composition.
26. The cement composition according to claim 25 wherein the mono ammonium phosphate is present in an amount ranging from 1 to 15% by weight of the total composition.
27. The cement composition according to claim 26 wherein the mono ammonium phosphate is present in an amount ranging from 1 to 5% by weight of the total composition
28. A phosphate-based fast-setting cement composition comprising a low purity source of MgO, monopotassium phosphate, monoammonium phosphate; a source of silica; and water
29. The cement composition according to claim 28 further comprising a retarder selected from the group consisting of: sodium fluoride and sodium stannate.
30 The cement composition according to any one of claims 27 to 29 wherein the source of silica is fly ash.
31: The cement composition according to any one of claims 27 to 30 further comprising a retarder selected from the group consisting of sodium fluoride and sodium stannate
32. The cement composition according to any one of claims 27 to 31, wherein the low purity source of MgO
is selected from the group consisting of: magnesium silicate having a MgO
content of less than 85% and magnesium aluminate having a MgO content of less than 85% and a combination thereof
is selected from the group consisting of: magnesium silicate having a MgO
content of less than 85% and magnesium aluminate having a MgO content of less than 85% and a combination thereof
33. The cement composition according to claim 32, wherein the low purity source of MgO is magnesium silicate having a MgO content of less than 85%
34. A concrete comprising a cement according to any one of claims 1 to 33 further comprising components selected from the group consisting: granular sand, stone aggregates and combinations thereof.
35. A concrete according to claim 34 wherein the granular sand is quartz sand having an average particle size of 3 mm.
36. A mortar comprising a cement according to any one of claims 1 to 33 further comprising sand.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2915539A CA2915539A1 (en) | 2015-12-21 | 2015-12-21 | Magnesium phosphate based cement, mortar and concrete compositions with increased working time |
| PCT/IB2016/002007 WO2017109583A2 (en) | 2015-12-21 | 2016-12-14 | Magnesium phosphate based cement, mortar and concrete compositions with increased working time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2915539A CA2915539A1 (en) | 2015-12-21 | 2015-12-21 | Magnesium phosphate based cement, mortar and concrete compositions with increased working time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2915539A1 true CA2915539A1 (en) | 2017-06-21 |
Family
ID=59078303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2915539A Abandoned CA2915539A1 (en) | 2015-12-21 | 2015-12-21 | Magnesium phosphate based cement, mortar and concrete compositions with increased working time |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2915539A1 (en) |
| WO (1) | WO2017109583A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108975751A (en) * | 2018-09-27 | 2018-12-11 | 辽宁科技大学 | A kind of concrete additive, preparation and application |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443849B (en) * | 2021-07-28 | 2022-12-02 | 喜跃发国际环保新材料股份有限公司 | Retarder for magnesium phosphate cement and use method thereof |
| CN115448687B (en) * | 2022-10-18 | 2023-08-04 | 中铁第四勘察设计院集团有限公司 | Magnesium ammonium phosphate cement-based composite material and preparation method and application thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758278A (en) * | 1986-11-28 | 1988-07-19 | E. I. Du Pont De Nemours And Company | Magnesium oxide powder for workable, rapid-setting phosphate-containing cement compositions |
| US20020009622A1 (en) * | 1999-08-03 | 2002-01-24 | Goodson David M. | Sprayable phosphate cementitious coatings and a method and apparatus for the production thereof |
| JP4562929B2 (en) * | 2001-02-14 | 2010-10-13 | 独立行政法人農業・食品産業技術総合研究機構 | Cement composition |
| CA2462546A1 (en) * | 2004-03-30 | 2005-09-30 | Michael J. Mabey | Lightweight "mineral foam" composite materials and methods of making and using such composite materials |
| US7204880B1 (en) * | 2004-05-21 | 2007-04-17 | Turner Terry A | Rapid setting cement |
| US9815738B2 (en) * | 2012-10-09 | 2017-11-14 | Premier Magnesia, Llc | Magnesium phosphate cement |
-
2015
- 2015-12-21 CA CA2915539A patent/CA2915539A1/en not_active Abandoned
-
2016
- 2016-12-14 WO PCT/IB2016/002007 patent/WO2017109583A2/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108975751A (en) * | 2018-09-27 | 2018-12-11 | 辽宁科技大学 | A kind of concrete additive, preparation and application |
| CN108975751B (en) * | 2018-09-27 | 2021-04-09 | 辽宁科大中驰镁建材科技有限公司 | A kind of admixture for concrete, preparation and application |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017109583A2 (en) | 2017-06-29 |
| WO2017109583A3 (en) | 2017-08-03 |
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