CN116854435A - A green and environmentally friendly high-strength composite Portland cement material and preparation method - Google Patents
A green and environmentally friendly high-strength composite Portland cement material and preparation method Download PDFInfo
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- CN116854435A CN116854435A CN202310932133.1A CN202310932133A CN116854435A CN 116854435 A CN116854435 A CN 116854435A CN 202310932133 A CN202310932133 A CN 202310932133A CN 116854435 A CN116854435 A CN 116854435A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention discloses an environment-friendly high-strength composite silicate cement material and a preparation method thereof. The raw materials comprise 500-600 parts of Portland cement, 200-240 parts of fly ash and 125-150 parts of household garbage incineration fly ash pretreated by water washing; oscillating the mixed solution obtained by mixing fly ash and tap water, performing solid-liquid separation on the mixed solution after oscillating, and filtering and taking out the solid; repeating the steps, drying the filtered solid to obtain agglomerated fly ash, and preparing the fly ash pretreated by washing by a physical grinding method; and mixing and stirring the fly ash, the fly ash and the silicate cement pretreated by water washing uniformly to obtain the product. According to the invention, through the performance complementation and synergistic effect of the two admixtures, the green and environment-friendly high-strength composite silicate cement is prepared, has higher early-stage and later-stage strength, can realize the recycling of wastes to the maximum extent, reduces the environmental pollution, saves natural resources and relieves the pressure of resource shortage.
Description
Technical Field
The invention relates to a high-strength composite cement material and a preparation method thereof, and in particular relates to a green and environment-friendly high-strength composite silicate cement material and a preparation method thereof.
Background
Cement is used as the cementing material with the most important and largest consumption in the current construction engineering, and not only can consume a large amount of energy sources and a large amount of non-renewable natural mineral resources in the production process, but also can generate a large amount of carbon dioxide emission, thereby having very negative effects on environmental protection and sustainable development.
With the rapid development of global infrastructure construction, the demand for cement is rapidly increasing, while the traditional raw material resources are limited, and the demand for cement is rapidly increasing and increasingThe shortage of traditional mineral resources creates a contradiction between supply and demand. Fly ash as common silicate cement admixture belongs to CaO-SiO 2 -Al 2 O 3 -Fe 2 O 3 The system has pozzolanic activity and Ca (OH) generated by hydration with cement 2 The volcanic ash reaction occurs to produce gelled substances such as C-S-H.
The fly ash silicate cement has the advantages of large later strength enhancement rate and the like, however, the fly ash has poorer reactivity and slower reaction speed, and when being doped in a large amount, the early strength of the cement can be obviously reduced. Compared with cement clinker, the reaction activity of the fly ash is poor, the reaction speed is very slow under the condition of no external excitation, and the problems of low early strength, long setting time and the like of the fly ash silicate cement are caused, so that the form removal period and the engineering progress of concrete engineering are influenced, and the practical engineering application of the fly ash silicate cement is restricted.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a green and environment-friendly high-strength composite silicate cement material and a preparation method, because fly ash is favorable for the development of early strength of cement and the fly ash is favorable for the later strength of cement, the fly ash can better excite the pozzolanic effect of the fly ash, and the waste incineration fly ash and the fly ash which are subjected to water washing pretreatment are compounded to be added into silicate cement as admixture, so that the active components in the admixture are activated to the maximum extent by utilizing the performance complementation and the synergistic effect of the two admixture, the early and later mechanical properties are synergistically improved, the recycling utilization of wastes is realized, the consumption of cement is reduced, the production cost of the cement is reduced, and the cement has important theoretical and practical significance.
The technical scheme of the invention is as follows:
1. the environment-friendly high-strength composite silicate cement material comprises the following raw materials in parts by weight:
500-600 parts of silicate cement;
200-240 parts of fly ash;
125-150 parts of fly ash.
The silicate cement is PI silicate cement.
The fly ash is household garbage incineration fly ash pretreated by water washing.
The household garbage incineration fly ash is fire grate furnace fly ash, wherein SiO 2 The content is not less than 25%, the CaO content is not less than 30%, and Al 2 O 3 The content is not less than 10%.
The fly ash is primary, secondary, tertiary ash or total ash, wherein SiO 2 The content is not less than 35%, the CaO content is not less than 3%, al 2 O 3 The content is not less than 20%.
SiO in the admixture formed by compounding fly ash and fly ash 2 The content of CaO is not less than 30%, the content of Al is not less than 12% 2 O 3 The content is not less than 15%.
In the high-strength composite silicate cement material, the content of Cl ions is 0.051-0.057%, and the specification of Cl is met; the ion content is less than or equal to 0.06 percent.
Specifically, the main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
2. The preparation method of the high-strength composite silicate cement material comprises the following steps:
(1) Placing the mixed solution obtained by mixing fly ash and tap water in a constant-temperature oscillator for oscillation treatment;
(2) After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, and filtering and taking out the solid;
(3) Repeating the steps (1) - (2) for 2 times, finally, placing the filtered solid in a drying box at 65 ℃ for drying for 2d, obtaining agglomerated fly ash after drying, and carrying out powder preparation treatment on the agglomerated fly ash by a physical grinding method to obtain the fly ash subjected to water washing pretreatment, wherein the mass percentage of Cl ions is less than 5%;
(4) And mixing and stirring the fly ash, the fly ash and the silicate cement pretreated by water washing uniformly according to the proportion to obtain the environment-friendly high-strength composite silicate cement material.
In the step (1), fly ash and tap water are mixed according to the proportion of 1: the mixed solution after mixing in the mass ratio of 5 is placed in a constant temperature oscillator and oscillated for 5min at an oscillation frequency of 180 r/min.
The fly ash from incineration of household garbage (simply called fly ash) is one of solid waste materials for power generation by incineration of garbage, and chemical composition analysis and a great deal of researches on the fly ash show that the fly ash and the fly ash have similar components and have potential pozzolanic activity. However, fly ash as an admixture increases the early strength of cement but decreases the later strength.
The invention develops a green and environment-friendly high-strength composite silicate cement material, which utilizes the characteristics that the chemical components of the fly ash and the fly ash of the incineration of the household garbage are close to cement, and the fly ash has gelling activity and can be used as an admixture of concrete, so that the early-stage and later-stage mechanical properties of the silicate cement are improved, the recycling of wastes is realized, the consumption of the cement is reduced, the production cost of the cement is reduced, and the cement has important theoretical and practical significance.
The invention combines special fly ash material with hydration product Ca (OH) of cement 2 Generating gelling substances such as C-S-H and the like through reaction, and having certain gelling effect; meanwhile, a proper amount of Cl ions in the fly ash can promote early hydration of cement, and in addition, the fly ash is alkaline and contains a large amount of Ca elements, so that the activity of the fly ash can be well excited.
The invention takes the waste incineration fly ash and the fly ash which are pretreated by water washing as the admixture, utilizes the advantages of the fly ash for the early strength development of the cement and the fly ash for the later strength of the cement, and prepares the environment-friendly high-strength composite silicate cement by the performance complementation and the synergistic effect of the two admixtures.
Under the condition of adopting PI 52.5-grade Portland cement, the 3d compressive strength can reach 41.5 MPa-42.3 MPa, the 28d compressive strength can reach 51.6 MPa-55.6 MPa, the 90d compressive strength can reach 62 MPa-64.1 MPa, the early-stage and later-stage strength is higher, the recycling of wastes can be realized to the greatest extent, the environmental pollution is reduced, the natural resources are saved, and the resource shortage pressure is relieved.
In the invention, the following components are added:
1. the fly ash contains a relatively high amount of volcanic ash active substances, and can react with a hydration product Ca (OH) 2 of cement to generate C-S-H and other gelling substances, so that the fly ash has a certain gelling effect and can be used as a cement admixture. However, the activity of the fly ash is affected by the hydration process of the cement, the early strength is lower, the chemical reaction is slower, and the fly ash is not suitable for early-strength cement;
2. the fly ash contains a higher amount of Cl element, and the Cl element is a commonly used early strength agent in the market, so that the hydration reaction of cement can be promoted, and the hardening speed of the cement can be accelerated. The fly ash is mixed into the cement, so that the setting time of the cement can be reduced and the early strength can be improved;
3. the fly ash is alkaline and contains a large amount of Ca element, can be used as an exciting agent for the pozzolan reaction of the fly ash, well excites the activity of the fly ash and improves the early-stage and later-stage strength of cement.
In conclusion, the fly ash and the incineration fly ash are mixed according to the proportion and then used as the admixture to produce the novel composite silicate cement, and the cement has better early strength and better later strength.
The beneficial effects of the invention are as follows:
compared with the prior art, the invention fully activates and exerts active components in the fly ash and the fly ash by adding the fly ash and the fly ash into the silicate cement, and generates more hydration products, thereby leading the material to have higher early strength and later strength. Under the condition of adopting PI 52.5-grade Portland cement, the compressive strength of the Portland cement in 3 days can reach 41.5MPa to 42.3MPa, the compressive strength in 28 days can reach 51.6MPa to 55.6MPa, and the compressive strength in 90d can reach 62MPa to 64.1MPa, so that the early-stage and later-stage mechanical properties of the Portland cement are greatly improved.
The invention realizes the resource utilization of the wastes such as the fly ash, the fly ash and the like by adding the fly ash and the fly ash into the silicate cement; meanwhile, the utilization rate of the waste in the composite silicate cement material provided by the invention is up to 40.0%, so that the production cost of cement is obviously reduced, the discharge amount of the waste in the production process is greatly reduced, and the purposes of environmental protection and sustainable development are achieved.
Detailed Description
The invention will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
The raw materials used in the following examples meet the following requirements:
the fly ash is obtained from Zhejiang and eight-direction thermoelectric limited liability company, and the incineration process is a grate furnace; fly ash is produced from the large Tang power plant in Henan province; pi.52.5 portland cement is produced by shandong kangjing new material technology limited. The chemical composition of the furnace fly ash and fly ash is shown in Table 1.
TABLE 1 composition of fly ash and fly ash from refuse incineration
Embodiments of the invention are as follows:
example 1:
the environment-friendly high-strength composite silicate cement material comprises the following components in parts by weight:
500 parts of PI.52.5 Portland cement, 200 parts of fly ash and 125 parts of fly ash pretreated by water washing. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
The preparation method comprises the following steps:
(1) Fly ash and tap water were mixed according to 1:5, mixing the materials, and then placing the mixture into a constant temperature oscillator to oscillate for 5min at an oscillation frequency of 180 r/min. After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, filtering and taking out the solid, repeating the steps for 2 times, and finally, placing the filtered solid in a drying box at 65 ℃ for drying for 2 days, and after the drying is finished, preparing the fly ash pretreated by washing by a physical grinding method;
(2) And sequentially adding the weighed silicate cement, the fly ash and the fly ash pretreated by washing into a stirrer for dry mixing, and mixing to obtain the fly ash and fly ash mixed silicate cement material.
(3) The fly ash and fly ash of the invention are mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 2475 parts of standard sand and 412.5 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Example 2:
the environment-friendly high-strength composite silicate cement material comprises the following components in parts by weight:
600 parts of PI.52.5-grade Portland cement, 240 parts of fly ash and 150 parts of fly ash pretreated by water washing. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
The preparation method comprises the following steps:
(1) Fly ash and tap water were mixed according to 1:5, mixing the materials, and then placing the mixture into a constant temperature oscillator to oscillate for 5min at an oscillation frequency of 180 r/min. After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, filtering and taking out the solid, repeating the steps for 2 times, and finally, placing the filtered solid in a drying box at 65 ℃ for drying for 2 days, and after the drying is finished, preparing the fly ash pretreated by washing by a physical grinding method;
(2) And sequentially adding the weighed silicate cement, the fly ash and the fly ash pretreated by washing into a stirrer for dry mixing, and mixing to obtain the fly ash and fly ash mixed silicate cement material.
(3) The fly ash and fly ash of the invention are mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 2970 parts of standard sand and 495 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Example 3:
the environment-friendly high-strength composite silicate cement material comprises the following components in parts by weight:
500 parts of PI.52.5 Portland cement, 200 parts of fly ash and 150 parts of fly ash pretreated by water washing. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
The preparation method comprises the following steps:
(1) Fly ash and tap water were mixed according to 1:5, mixing the materials, and then placing the mixture into a constant temperature oscillator to oscillate for 5min at an oscillation frequency of 180 r/min. After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, filtering and taking out the solid, repeating the steps for 2 times, and finally, placing the filtered solid in a drying box at 65 ℃ for drying for 2 days, and after the drying is finished, preparing the fly ash pretreated by washing by a physical grinding method;
(2) And sequentially adding the weighed silicate cement, the fly ash and the fly ash pretreated by washing into a stirrer for dry mixing, and mixing to obtain the fly ash and fly ash mixed silicate cement material.
(3) The fly ash and fly ash of the invention are mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 2475 parts of standard sand and 412.5 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Example 4:
the environment-friendly high-strength composite silicate cement material comprises the following components in parts by weight:
500 parts of PI.42.5 Portland cement, 200 parts of fly ash and 150 parts of fly ash pretreated by water washing. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
The preparation method comprises the following steps:
(1) Fly ash and tap water were mixed according to 1:5, mixing the materials, and then placing the mixture into a constant temperature oscillator to oscillate for 5min at an oscillation frequency of 180 r/min. After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, filtering and taking out the solid, repeating the steps for 2 times, and finally, placing the filtered solid in a drying box at 65 ℃ for drying for 2 days, and after the drying is finished, preparing the fly ash pretreated by washing by a physical grinding method;
(2) And sequentially adding the weighed silicate cement, the fly ash and the fly ash pretreated by washing into a stirrer for dry mixing, and mixing to obtain the fly ash and fly ash mixed silicate cement material.
(3) The fly ash and fly ash of the invention are mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 2475 parts of standard sand and 412.5 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Example 5:
the environment-friendly high-strength composite silicate cement material comprises the following components in parts by weight:
500 parts of PI.62.5 Portland cement, 200 parts of fly ash and 150 parts of fly ash pretreated by water washing. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
The preparation method comprises the following steps:
(1) Fly ash and tap water were mixed according to 1:5, mixing the materials, and then placing the mixture into a constant temperature oscillator to oscillate for 5min at an oscillation frequency of 180 r/min. After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, filtering and taking out the solid, repeating the steps for 2 times, and finally, placing the filtered solid in a drying box at 65 ℃ for drying for 2 days, and after the drying is finished, preparing the fly ash pretreated by washing by a physical grinding method;
(2) And sequentially adding the weighed silicate cement, the fly ash and the fly ash pretreated by washing into a stirrer for dry mixing, and mixing to obtain the fly ash and fly ash mixed silicate cement material.
(3) The fly ash and fly ash of the invention are mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 2475 parts of standard sand and 412.5 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Comparative example 1:
the silicate cement material comprises the following components in parts by weight:
1000 parts of PI.52.5 Portland cement.
The preparation method comprises the following steps:
(1) The weighed silicate cement material is made into tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 3000 parts of standard sand and 500 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Comparative example 2:
the silicate cement material comprises the following components in parts by weight:
500 parts of PI.52.5 Portland cement, 200 parts of fly ash and 150 parts of fly ash which is not subjected to water washing pretreatment. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% and 3.24% CaO. The main chemical components of the fly ash are as follows: siO (SiO) 2 27.9% of Al 2 O 3 13.3%, caO 32.5%, fe 2 O 3 0.78%.
The preparation method comprises the following steps:
(1) And sequentially adding the weighed silicate cement, the fly ash and the fly ash which is not subjected to water washing pretreatment into a stirrer for dry mixing, and mixing to obtain the fly ash and fly ash mixed silicate cement material.
(2) The fly ash and fly ash of the invention are mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is adopted as water. 2475 parts of standard sand and 412.5 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
Comparative example 3:
the silicate cement material comprises the following components in parts by weight:
500 parts of PI.52.5-grade Portland cement and 200 parts of fly ash. The main chemical components of the fly ash are as follows: siO (SiO) 2 38.2% of Al 2 O 3 24.6% of Fe 2 O 3 4.18% CaO 3.24%。
The preparation method comprises the following steps:
(1) And sequentially adding the weighed silicate cement and the fly ash into a stirrer for dry mixing, and mixing to obtain the fly ash blended silicate cement material.
(2) The fly ash of the invention is mixed with silicate cement material to prepare tested mortar, wherein the mixed mortar is ISO standard mortar specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999, and tap water is selected as water. 2475 parts of standard sand and 412.5 parts of water. The preparation of the cement sand, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the test piece are all carried out according to the GB/T17671-1999 standard of the cement sand strength test method (ISO method).
The test results of the present examples 1 to 5 and comparative example 1 are shown in Table 2.
Table 2 shows the mechanical properties of green and environment-friendly high-strength composite silicate cement mortar
| Numbering device | 3d average compressive strength/MPa | 28d average compressive strength/MPa | 90d average compressive strength/MPa |
| Example 1 | 42.3 | 55.6 | 64.1 |
| Example 2 | 41.8 | 54.2 | 63.4 |
| Example 3 | 41.5 | 51.6 | 62 |
| Example 4 | 31.9 | 43.6 | 51.1 |
| Example 5 | 47.8 | 62.7 | 73.2 |
| Comparative example 1 | 30.1 | 52.9 | 58.1 |
| Comparative example 2 | 45.1 | 56.2 | 57.3 |
| Comparative example 3 | 17.5 | 40.3 | 61.1 |
From the results in table 2, the green and environment-friendly high-strength composite portland cement mortar provided by the invention has compressive strengths of 3d and 28d which meet the strength requirements of the standard on all zero phases of the general portland cement. Under the condition of adopting PI 52.5-grade Portland cement, the 3d compressive strength reaches 41.5 MPa-42.3 MPa,28d compressive strength reaches 51.6 MPa-55.6 MPa, and 90d compressive strength reaches 62 MPa-64.1 MPa. Compared with comparative example 1, the cement mortar formed in examples 1-3 of the invention has significantly improved 3d compressive strength and improved 28d and 90d compressive strengths, and can meet the construction requirements of concrete; compared with comparative example 2, the cement mortar molded in examples 1-3 of the invention has significantly improved 90d compressive strength; the cement mortar molded in examples 1 to 3 of the present invention has significantly improved 3d and 28d compressive strength as compared with comparative example 3.
The environment-friendly high-strength composite silicate cement material provided by the invention has the following properties by adding fly ash, fly ash and the like as mixed materials:
(1) The compressive strength, especially early compressive strength, of the cement mortar can be effectively improved, the form removal period and the project progress of concrete projects can be accelerated, and the application requirements of actual projects are met;
(2) The method can realize the resource utilization of the wastes such as the fly ash, the fly ash and the like, the utilization rate reaches 40.0 percent, and the purposes of saving energy, reducing consumption and lowering cost are achieved.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The environment-friendly high-strength composite silicate cement material is characterized by comprising the following raw materials in parts by weight:
500-600 parts of silicate cement;
200-240 parts of fly ash;
125-150 parts of fly ash.
2. The high strength composite portland cement material of claim 1, wherein the portland cement is PI portland cement.
3. The high-strength portland cement material according to claim 1, wherein,
the fly ash is household garbage incineration fly ash pretreated by water washing.
4. The high-strength portland cement material according to claim 3, wherein,
the household garbage incineration fly ash is fire grate furnace fly ash, wherein SiO 2 The content is not less than 25%, the CaO content is not less than 30%, and Al 2 O 3 The content is not less than 10%.
5. The high strength portland cement material of claim 1, wherein the fly ash is one, two, three or a solid ash, wherein SiO 2 The content is not less than 35%, the CaO content is not less than 3%, al 2 O 3 The content is not less than 20%.
6. The high-strength composite portland cement material according to claim 1, wherein,
SiO in the admixture formed by compounding the fly ash and the fly ash 2 The content of CaO is not less than 30%, the content of Al is not less than 12% 2 O 3 The content is not less than 15%.
7. The high-strength composite portland cement material according to claim 1, wherein,
in the high-strength composite silicate cement material, the content of Cl ions is 0.051-0.057%.
8. A method for preparing the high-strength composite Portland cement material according to any one of claims 1 to 7, comprising the steps of:
(1) Placing the mixed solution obtained by mixing fly ash and tap water in a constant-temperature oscillator for oscillation treatment;
(2) After the oscillation is finished, carrying out solid-liquid separation on the mixed solution, and filtering and taking out the solid;
(3) Repeating the steps (1) - (2) for 2 times, finally, placing the filtered solid in a drying box for drying, obtaining agglomerated fly ash after the drying is finished, and preparing the fly ash pretreated by washing by the agglomerated fly ash through a physical grinding method;
(4) And mixing and stirring the fly ash, the fly ash and the silicate cement pretreated by water washing uniformly according to the proportion to obtain the environment-friendly high-strength composite silicate cement material.
9. The method for preparing a high-strength composite portland cement material according to claim 8, wherein:
in the step (1), fly ash and tap water are mixed according to the proportion of 1: the mixed solution after mixing in the mass ratio of 5 is placed in a constant temperature oscillator and oscillated for 5min at an oscillation frequency of 180 r/min.
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| CN202310932133.1A CN116854435A (en) | 2023-07-27 | 2023-07-27 | A green and environmentally friendly high-strength composite Portland cement material and preparation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117645423A (en) * | 2023-11-17 | 2024-03-05 | 长江勘测规划设计研究有限责任公司 | Geopolymer/sludge extract-based high-salinity fly ash curing agent and curing method |
| CN119161165A (en) * | 2024-09-28 | 2024-12-20 | 长江水利委员会长江科学院 | A multi-component high-salt solid waste alkali salt high-toughness mortar material and preparation method thereof |
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| KR20040001080A (en) * | 2002-06-26 | 2004-01-07 | 한국지질자원연구원 | a Process Method for Scatter Ash following burn up Living Wastes |
| CN104310880A (en) * | 2014-09-29 | 2015-01-28 | 同济大学 | Method for improving freeze-thaw resistance of concrete by using waste incineration fly ash pre-treated by washing |
| CN113443872A (en) * | 2021-06-24 | 2021-09-28 | 东南大学 | Green environment-friendly type ultra-high performance concrete material and preparation method thereof |
| CN114163150A (en) * | 2021-07-23 | 2022-03-11 | 深圳市能源环保有限公司 | Method for preparing cementing material by using water-washed waste incineration fly ash and application |
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| KR20040001080A (en) * | 2002-06-26 | 2004-01-07 | 한국지질자원연구원 | a Process Method for Scatter Ash following burn up Living Wastes |
| CN104310880A (en) * | 2014-09-29 | 2015-01-28 | 同济大学 | Method for improving freeze-thaw resistance of concrete by using waste incineration fly ash pre-treated by washing |
| CN113443872A (en) * | 2021-06-24 | 2021-09-28 | 东南大学 | Green environment-friendly type ultra-high performance concrete material and preparation method thereof |
| CN114163150A (en) * | 2021-07-23 | 2022-03-11 | 深圳市能源环保有限公司 | Method for preparing cementing material by using water-washed waste incineration fly ash and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117645423A (en) * | 2023-11-17 | 2024-03-05 | 长江勘测规划设计研究有限责任公司 | Geopolymer/sludge extract-based high-salinity fly ash curing agent and curing method |
| CN119161165A (en) * | 2024-09-28 | 2024-12-20 | 长江水利委员会长江科学院 | A multi-component high-salt solid waste alkali salt high-toughness mortar material and preparation method thereof |
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