CN111943540A - Magnesium flyash cement composition and its products and making method - Google Patents
Magnesium flyash cement composition and its products and making method Download PDFInfo
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- CN111943540A CN111943540A CN202010627517.9A CN202010627517A CN111943540A CN 111943540 A CN111943540 A CN 111943540A CN 202010627517 A CN202010627517 A CN 202010627517A CN 111943540 A CN111943540 A CN 111943540A
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- fly ash
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- 239000010881 fly ash Substances 0.000 title claims abstract description 80
- 239000004568 cement Substances 0.000 title claims abstract description 69
- 239000000203 mixture Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 24
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 22
- 239000011777 magnesium Substances 0.000 title claims description 22
- 229910052749 magnesium Inorganic materials 0.000 title claims description 22
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910001868 water Inorganic materials 0.000 claims abstract description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 16
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 claims abstract description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 8
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 7
- 239000010452 phosphate Substances 0.000 claims abstract description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 23
- 239000000835 fiber Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 13
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000002657 fibrous material Substances 0.000 claims description 6
- 238000009415 formwork Methods 0.000 claims description 6
- 229920002978 Vinylon Polymers 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 239000010754 BS 2869 Class F Substances 0.000 claims 1
- 235000013311 vegetables Nutrition 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 229910052681 coesite Inorganic materials 0.000 description 6
- 229910052906 cristobalite Inorganic materials 0.000 description 6
- 229910052682 stishovite Inorganic materials 0.000 description 6
- 229910052905 tridymite Inorganic materials 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 5
- 235000019341 magnesium sulphate Nutrition 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- CENHPXAQKISCGD-UHFFFAOYSA-N trioxathietane 4,4-dioxide Chemical compound O=S1(=O)OOO1 CENHPXAQKISCGD-UHFFFAOYSA-N 0.000 description 4
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 3
- 239000004137 magnesium phosphate Substances 0.000 description 3
- 229960002261 magnesium phosphate Drugs 0.000 description 3
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 3
- 235000010994 magnesium phosphates Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000012190 activator Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- FSBVERYRVPGNGG-UHFFFAOYSA-N dimagnesium dioxido-bis[[oxido(oxo)silyl]oxy]silane hydrate Chemical compound O.[Mg+2].[Mg+2].[O-][Si](=O)O[Si]([O-])([O-])O[Si]([O-])=O FSBVERYRVPGNGG-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/04—Magnesium cements containing sulfates, nitrates, phosphates or fluorides
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a magnesia fly ash cement composition, a product and a manufacturing method thereof. The magnesia fly ash cement is prepared from light-burned magnesia, fly ash, magnesium sulfate heptahydrate, phosphoric acid or phosphate and water. The high-performance disassembly-free fixed die template manufactured by using the magnesia fly ash cement has the following advantages: (1) the use value of the fly ash is improved; (2) the best state of the physical mechanical property and the chemical stability of the magnesia fly ash cement and the products thereof is achieved; (3) the construction efficiency of the building is improved.
Description
Technical Field
The invention belongs to the field of building material engineering, and relates to a magnesium fly ash cement composition, a product and a manufacturing method thereof.
Background
The existing magnesium cement comprises magnesium oxychloride cement, magnesium oxysulfate cement and magnesium phosphate cement. The magnesium oxychloride cement can not be applied to manufacturing of a non-dismantling fixed die template due to moisture absorption, halogen returning and metal corrosion; the magnesium oxysulfate cement has poor mechanical properties and cannot meet the strength requirement of a non-dismantling die-fixing template; the magnesium phosphate cement has too high reaction speed, and is difficult to mechanically produce the mould-fixing template without dismantling. The Chinese invention patent CN102701616B 'a high-strength magnesia fly ash clinker-free cement' requires that the ratio of fly ash to light-burned magnesia is 100: 30-40, namely the ratio of light-burned magnesia to fly ash is 100: 250-333. As the fly ash is mixed in a large amount, active silicon dioxide exists in a cement hardened body, and when the fly ash is used as the non-dismantling solid mould template cast-in-situ cement, alkali-aggregate reaction is easy to occur at a contact interface, so that the fly ash is not suitable for manufacturing the non-dismantling solid mould template.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnesia fly ash cement composition, a product and a manufacturing method thereof.
In one aspect, the present invention provides a magnesia fly ash cement composition comprising light-burned magnesium oxide, fly ash, magnesium sulfate heptahydrate, phosphoric acid or phosphate, and water.
In one embodiment, the magnesia fly ash cement composition comprises the following components in parts by weight:
wherein, part of effective components in the magnesium sulfate heptahydrate are obtained by the reaction of concentrated sulfuric acid and light-burned magnesia, but the additional light-burned magnesia reacted with the concentrated sulfuric acid does not change the proportion of the magnesia fly ash cement.
The selected fly ash is low-calcium F class 1 grade acidic fly ash (CaO < 7%) which is selected through sorting and grinding, the fineness is 0.045mm, the screen residue of a square-hole screen is less than or equal to 12%, the ignition loss is less than or equal to 5%, and the water demand ratio is less than or equal to 95%.
The magnesium sulfate heptahydrate diffuses more than hydrates when dissolved in water and is endothermic. Therefore, magnesium sulfate heptahydrate is slowly dissolved in water, and in order to accelerate the dissolution of magnesium sulfate heptahydrate, magnesium fly ash cement is prepared by using a magnesium sulfate solution with higher concentration, an exothermic reaction of concentrated sulfuric acid dissolved in water and an exothermic reaction of sulfuric acid and magnesium oxide to generate magnesium sulfate are required.
The invention has the remarkable characteristic that the effective components of part of the magnesium sulfate heptahydrate are obtained by the reaction of concentrated sulfuric acid and light-burned magnesia, but the proportion of the magnesia fly ash cement is not changed by the additional light-burned magnesia reacted with the concentrated sulfuric acid. The quantity of concentrated sulfuric acid is determined by the environmental temperature and the mixing amount of the fly ash, but the temperature of the slurry of the stirred magnesia fly ash cement is not higher than 35 ℃.
The reaction mechanism of the magnesia fly ash cement is different from magnesium oxychloride cement and magnesium oxysulfate cement, and is also different from magnesium phosphate cement. The reaction mechanism of the present invention includes: magnesium oxide is used as an alkaline activator, magnesium sulfate is used as a sulfate activator to activate the acidified fly ash, and the activated Al in the fly ash2O3Active SiO2The reaction produces a new magnesium cement which is formed by the copolymerization of hydrated magnesium aluminate sulfate, hydrated magnesium silicate and magnesium oxysulfate cement. Because of Al in the fly ash2O3、SiO2The chemical component proportion of the fly ash is different, the mixing amount of the fly ash is also different, the magnesium fly ash cement is dynamically proportioned according to the chemical component proportion difference of the fly ash, and the optimal proportioning of the magnesium fly ash cement is found out through experiments. Al activated in fly ash2O3、SiO2Fully participates in the hydration reaction of the magnesia fly ash cement, and avoids the alkali-aggregate reaction with the alkaline substance in the cast-in-situ portland cement.
In another aspect, the present invention provides a method of making a product using the magnesian fly ash cement, comprising the steps of:
magnesium sulfate heptahydrate, fly ash, phosphoric acid or phosphate and water are added with concentrated sulfuric acid and stirred to form a uniform mixture;
adding light-burned magnesium oxide into the mixture, and stirring to obtain clean slurry;
adding fiber materials into the purified pulp, and stirring the mixture into slurry; and
and forming the slurry to manufacture a fiber reinforced cement product.
The method may further comprise:
stirring 30-70 parts of fly ash, 39-61 parts of magnesium sulfate heptahydrate, 0.7-1.3 parts of phosphoric acid or phosphate and 35-80 parts of water into a uniform mixture;
adding 100 parts of light-burned magnesium oxide into the mixture, and stirring to obtain pure slurry;
adding 15 parts of fiber material into the clean slurry, and stirring into slurry; and
and forming the slurry to manufacture a fiber reinforced cement product.
The fiber material is one or more of glass fiber, modified vinylon fiber, modified polypropylene fiber or plant fiber or the combination thereof.
The fiber reinforced cement product can be a high-performance non-dismantling mould-fixing template.
By adopting the process steps, the coal ash is favorably acidified, and the functions of an alkaline excitant of magnesium oxide and a sulfate excitant of magnesium sulfate are fully exerted.
The magnesia fly ash cement is prepared to manufacture a high-performance non-dismantling die-fixing template, and can be added with additives such as a water reducing agent, an early strength admixture, a retarder, an accelerator, a plasticizer and the like as other cements. These are well known techniques to those skilled in the art, provided that these additives do not adversely affect the achievement of the objects and effects of the present invention.
The high-performance disassembly-free fixed die template made of the magnesia fly ash cement can be made by a rolling forming process, a semi-dry pressing forming process and even a semi-dry hot pressing forming process instead of a copying method and a pulp flow method.
In yet another aspect, the present invention provides a product made from the magnesian fly ash cement composition. In one embodiment the product is a high performance non-demolition solid form.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, different proportions of the fly ash with different chemical component proportions are adopted, so that the fly ash which is a production waste is reasonably utilized as a new production element, and the use value of the fly ash is improved.
(2) According to the invention, on the basis of acidizing the fly ash, an alkaline excitant and a sulfate excitant are adopted to excite the activity of the fly ash, so that the effective components of the fly ash are fully utilized, and the optimal states of the physical and mechanical properties and the chemical stability of the magnesium fly ash cement and the magnesium fly ash cement product are achieved.
(3) And a high-performance non-dismantling fixed formwork template or other wall materials are manufactured by using fiber reinforced magnesium fly ash cement, so that the building construction efficiency is improved.
Detailed Description
The invention relates to a magnesia fly ash cement and high-performance non-dismantling fixed die template and a manufacturing method thereof, and the manufacturing method comprises the following process steps: adding concentrated sulfuric acid into magnesium sulfate heptahydrate, fly ash, phosphoric acid or phosphate and water, and stirring; after being stirred evenly, the light-burned magnesia is added and stirred into clean slurry; after the net slurry is prepared, at least one of glass fiber, modified vinylon fiber, modified polypropylene fiber or plant fiber is used for reinforcement, and various molding equipment is used for preparing a high-performance non-dismantling mold-fixing template or other fiber-reinforced cement products. By adopting the process steps, the coal ash is favorably acidified, and the functions of an alkaline excitant of magnesium oxide and a sulfate excitant of magnesium sulfate are fully exerted.
The magnesia fly ash cement is prepared to manufacture a high-performance non-dismantling die-fixing template, and can be added with additives such as a water reducing agent, an early strength admixture, a retarder, an accelerator, a plasticizer and the like as other cements. These are well known techniques to those skilled in the art, provided that these additives do not adversely affect the achievement of the objects and effects of the present invention.
The high-performance disassembly-free fixed die template made of the magnesia fly ash cement can be made by a rolling forming process, a semi-dry pressing forming process and even a semi-dry hot pressing forming process instead of a copying method and a pulp flow method.
The invention is further illustrated by the following examples, which are not to be construed as limiting the scope of the invention, which is intended to be covered by the claims and which are not to be construed as requiring insubstantial modifications or adaptations of the invention by those skilled in the art from the foregoing disclosure.
Example 1 fabrication of a 20mm thick fabricated building disassembly-free composite floor slab
Al in chemical components detected after pre-homogenization of transported fly ash2O326% of SiO248 percent, and the optimized proportion of the magnesium fly ash cement according to the test is as follows by weight: 100 parts of light-burned magnesium oxide, 50 parts of fly ash, 52 parts of magnesium sulfate heptahydrate, 0.7 part of phosphoric acid and 58 parts of water. Stirring the mixture into magnesium fly ash cement paste according to the manufacturing process steps in the invention; after the pulp is cleaned, 15 parts of wood chips are added and stirred into slurry. Rolling the glass fiber mesh cloth with 200g per square meter of upper and lower layers into a plate blank, curing for 8h in a curing room at 35 ℃ and demoulding, wherein after natural curing for 15d, each performance index can reach the requirements specified by JC/T412.1-2018 'asbestos-free fiber cement slab', and the plate blank is used for assembly type building non-dismantling laminated floor plates.
Example 2 manufacture of a dismantling-free cast-in-place cement external wall formwork for a frame type building production workshop with a thickness of 8mm
Al in chemical components detected after pre-homogenization of transported fly ash2O318% of SiO2The weight percentage of the components of the magnesia fly ash cement is 60%, and the preferred proportion of the magnesia fly ash cement according to the test is as follows: 100 parts of light-burned magnesium oxide, 58 parts of fly ash, 41 parts of magnesium sulfate heptahydrate, 1.3 parts of potassium dihydrogen phosphate and 37 parts of water. Stirring the mixture into magnesia fly ash cement paste according to the manufacturing process in the invention; after the slurry is prepared, the slurry is mixed with 7 parts of modified vinylon fiber to form the magnesium fly ash cement semi-dry slurry. Paving, forming, cutting, stacking on a stacker one by one, stacking to a certain height, applying pressure of 5MPa in a plane press, locking a mold locking device, moving into a curing room at 40 ℃, curing for 8h, and demolding; after natural curing for 28 days, all performance indexes can meet the requirements specified by JC/T412.1-2018 'asbestos-free fiber cement slab', and the cast-in-place cement external wall template is used for a frame type building production workshop without dismantling.
Example 3 production of hollow slat of prefabricated building internal partition wall
Al in chemical components detected after pre-homogenization of transported fly ash2O333% of SiO2The weight percentage of the components of the magnesia fly ash cement is 52%, and the preferred proportion of the magnesia fly ash cement according to the test is as follows: 100 parts of light-burned magnesium oxide, 43 parts of fly ash, 56 parts of magnesium sulfate heptahydrate, 1.0 part of sodium hexametaphosphate and 63 parts of water. Stirring the mixture into magnesium fly ash cement paste according to the manufacturing process steps in the invention; after the clean slurry is prepared, 30 parts of wood chips and 10 parts of chopped brown fibers are added, the mixture is stirred into slurry, hollow battens are poured by a group formwork erection method, the battens are subjected to normal-pressure steam curing for 3 hours with the formwork, and after the formwork is removed and the battens are naturally cured for 14 days, all performance indexes can reach the technical requirements specified in GB/T23451-2009 'light partition battens for buildings' and the battens are used for assembling type partition battens for building interior partitions.
In the description herein, the products and methods of the present invention are described in terms of particular shapes, materials, dimensions, or process sequences, and some specific parameters are provided for illustration purposes with respect to specific embodiments. It should be understood, however, that the detailed description is not intended to limit the invention; that is, the shapes, materials, dimensions, processing steps or sequences may be appropriately adjusted, modified or changed according to actual needs, and still be included in the scope of the claims.
Claims (8)
1. The magnesium fly ash cement composition is characterized by comprising the following components in parts by weight:
wherein, part of effective components in the magnesium sulfate heptahydrate are obtained by the reaction of concentrated sulfuric acid and light-burned magnesia, but the additional light-burned magnesia reacted with the concentrated sulfuric acid does not change the proportion of the magnesia fly ash cement.
2. The magnesia fly ash cement composition as claimed in claim 1, wherein the fly ash is selected from sorted, ground low-calcium class-F grade-1 acidic fly ash, CaO < 7%, fineness 0.045mm, screen residue of square-hole screen < 12%, ignition loss < 5%, and water demand < 95%.
3. A method of making a product from the magnesian fly ash cement composition of claim 1 or 2, comprising:
1) magnesium sulfate heptahydrate, fly ash, phosphoric acid or phosphate and water are added with concentrated sulfuric acid and stirred to form a uniform mixture;
2) adding light-burned magnesium oxide into the mixture, and stirring to obtain clean slurry;
3) adding fiber materials into the purified pulp, and stirring the mixture into slurry; and
4) forming the slurry into an article.
4. The method of claim 3, comprising:
stirring 30-70 parts of fly ash, 39-61 parts of magnesium sulfate heptahydrate, 0.7-1.3 parts of phosphoric acid or phosphate and 35-80 parts of water into a uniform mixture;
adding 100 parts of light-burned magnesium oxide into the mixture, and stirring to obtain pure slurry;
adding 15 parts of fiber material into the clean slurry, and stirring into slurry; and
forming the slurry into a fiber cement article.
5. The method of claim 3 or 4, wherein the fibrous material is glass fiber, modified vinylon fiber, modified polypropylene fiber, or vegetable fiber, or a combination thereof.
6. The method of claim 3, wherein the fiber cement article is a high performance, non-demolition cast formwork.
7. A product made from the magnesium fly ash cement composition of claim 1 or 2.
8. The product of claim 7, which is a high performance tamper-free form.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010627517.9A CN111943540A (en) | 2020-07-02 | 2020-07-02 | Magnesium flyash cement composition and its products and making method |
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| CN202010627517.9A CN111943540A (en) | 2020-07-02 | 2020-07-02 | Magnesium flyash cement composition and its products and making method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115716742A (en) * | 2022-11-23 | 2023-02-28 | 大连理工大学 | Glass fiber reinforced hydrated magnesium silicate cement composite material and preparation method thereof |
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| CN1468706A (en) * | 2002-07-17 | 2004-01-21 | 丁玉峒 | Light composite flyash-calcium silicate board |
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| CN104446063A (en) * | 2014-12-03 | 2015-03-25 | 北京中晶佳镁环境科技股份有限公司 | Cement and manufacturing method thereof |
| CN104496235A (en) * | 2014-12-15 | 2015-04-08 | 北京中晶佳镁环境科技股份有限公司 | Magnesia cement and manufacturing method thereof |
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Application publication date: 20201117 |