CN115448680A - Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof - Google Patents
Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof Download PDFInfo
- Publication number
- CN115448680A CN115448680A CN202211253546.9A CN202211253546A CN115448680A CN 115448680 A CN115448680 A CN 115448680A CN 202211253546 A CN202211253546 A CN 202211253546A CN 115448680 A CN115448680 A CN 115448680A
- Authority
- CN
- China
- Prior art keywords
- parts
- cement
- fly ash
- desulfurized gypsum
- curing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 61
- 239000004568 cement Substances 0.000 title claims abstract description 58
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 46
- 239000010440 gypsum Substances 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 title claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 31
- 239000002910 solid waste Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 25
- 239000004567 concrete Substances 0.000 claims description 43
- 238000000227 grinding Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000036571 hydration Effects 0.000 abstract description 8
- 238000006703 hydration reaction Methods 0.000 abstract description 8
- 230000007246 mechanism Effects 0.000 abstract description 6
- 230000002195 synergetic effect Effects 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011575 calcium Substances 0.000 abstract description 3
- 229910052791 calcium Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 15
- 239000000047 product Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 239000011178 precast concrete Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- MQWCQFCZUNBTCM-UHFFFAOYSA-N 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylphenyl)sulfanyl-4-methylphenol Chemical group CC(C)(C)C1=CC(C)=CC(SC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O MQWCQFCZUNBTCM-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229940095564 anhydrous calcium sulfate Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229940057307 dihydrate calcium sulfate Drugs 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a low-carbon rapid demoulding prefabricated part prepared from a solid waste base cementing material containing cement, fly ash and desulfurized gypsum, which comprises the following raw materials in parts by weight: 100 to 150 portions of cement, 200 to 250 portions of fly ash, 50 to 100 portions of desulfurized gypsum, 700 to 900 portions of fine aggregate, 1000 to 1200 portions of coarse aggregate, 4 to 6 portions of water reducing agent and 100 to 150 portions of water. The prefabricated member is prepared from the low-cement cementing material, wherein the mixing amount of cement is less than 30%, the mixing amount of fly ash is more than 50%, and a synergistic coupling action mechanism is formed between the low-cement cementing material and desulfurized gypsum. Through a special maintenance system, the influence of the coupling reaction of a calcium source, a silicon oxygen source and a sulfate substance is increased in the initial setting period of hydration, the crystal structure of a hydration product is stabilized while the early strength is rapidly increased, the durability of a prefabricated part is ensured, and the circulation efficiency of a prefabricated part mould is improved.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of solid waste resources and building materials, and particularly relates to a low-carbon rapid demoulding prefabricated part prepared from a solid waste base cementing material containing cement, fly ash and desulfurized gypsum and a preparation method thereof.
Background
Fly ash is a common admixture and is applied on a large scale in the field of building materials. If the fly ash is used as a raw material to prepare the precast concrete, the waste utilization is realized, the problem that the fly ash is difficult to treat is solved, the emission of carbon dioxide is reduced, the environmental pollution is reduced, the national policy of 'carbon emission reduction' is met, and meanwhile, the precast concrete with the large amount of fly ash can still reach the expected strength of more than 40MPa in 56 days. However, how to apply the large-amount fly ash as a raw material to precast concrete with sufficient engineering application strength is a difficult point to be solved.
CN 113620646B discloses a high-alumina fly ash self-insulation autoclaved aerated concrete block and a preparation method thereof. The absolute dry density of the concrete building block is less than or equal to 450kg/m and the preparation method thereof is successfully prepared 3 The compression strength is more than 2.5MPa, and the blank does not collapse the mould and is continuousThe high-alumina fly ash self-insulation autoclaved aerated concrete block product is stably produced. However, the process flow of the patent is complex, and an autoclave is required, so that the use is dangerous.
CN 114195465A discloses a non-curing concrete for C40 prefabricated parts and a preparation method thereof. The concrete has high early strength and good construction performance, can improve the turnover rate of the die, quickens the production progress and shortens the construction period. However, the patent uses a large amount of cement materials and also adds a chemical reagent sodium sulfate, so that the integral cost is high, the carbon emission is large, and the green degree of the concrete is insufficient.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a low-carbon rapid-demolding prefabricated member prepared from a solid waste-based cementing material containing cement, fly ash and desulfurized gypsum and a preparation method thereof.
The invention provides a low-carbon rapid demoulding prefabricated part prepared from a solid waste base cementing material containing cement, fly ash and desulfurized gypsum, which comprises the following raw materials in parts by weight: 100 to 150 portions of cement, 200 to 250 portions of fly ash, 50 to 100 portions of desulfurized gypsum, 700 to 900 portions of fine aggregate, 1000 to 1200 portions of coarse aggregate, 4 to 6 portions of water reducing agent and 100 to 150 portions of water.
Preferably, the cement is selected from Portland 42.5 cement.
Preferably, the fly ash is the fly ash meeting GB/T1596-2017 fly ash for cement and concrete.
Preferably, the desulfurized gypsum is the desulfurized gypsum meeting GB/T37785-2019 flue gas desulfurization gypsum.
Preferably, the fine aggregate is a fine aggregate which accords with GB/T25176-2010 recycled fine aggregate for concrete and mortar.
Preferably, the coarse aggregate is the coarse aggregate which conforms to GB/T25177-2010 recycled coarse aggregate for concrete.
Preferably, the water reducing agent is selected from polycarboxylic acid water reducing agents.
The invention also provides a preparation method of the prefabricated member, which comprises the following steps:
a) Mixing and grinding cement, fly ash and desulfurized gypsum to obtain a cementing material;
b) Mixing the cementing material, the fine aggregate, the coarse aggregate, the water reducing agent and water, and then pouring and forming to obtain poured and formed concrete;
c) And sequentially carrying out primary standard curing, curing under a heating condition, stripping and secondary standard curing on the cast concrete to obtain the low-carbon rapid demoulding prefabricated member.
Preferably, in the step A), the specific surface area of the ground raw material is 550m 2 /kg and above.
Preferably, the time of the first standard curing is 4 hours;
the curing temperature under the heating condition is 40-60 ℃, and the curing time is 8-20 hours;
the second standard curing to 1 day, 3 days, 7 days and 28 days age.
Compared with the prior art, the invention provides a low-carbon rapid demoulding prefabricated part prepared from a solid waste base cementing material containing cement, fly ash and desulfurized gypsum, which comprises the following raw materials in parts by weight: 100 to 150 parts of cement, 200 to 250 parts of fly ash, 50 to 100 parts of desulfurized gypsum, 700 to 900 parts of fine aggregate, 1000 to 1200 parts of coarse aggregate, 4 to 6 parts of water reducing agent and 100 to 150 parts of water. The prefabricated member is prepared from the low-cement cementing material, wherein the cement content is less than 30%, the fly ash content is more than 50%, and a synergistic coupling action mechanism is formed between the prefabricated member and the desulfurized gypsum. Through a special maintenance system, the influence of the coupling reaction of a calcium source, a silicon oxygen source and a sulfate substance is increased in the initial setting period of hydration, the crystal structure of a hydration product is stabilized while the early strength is rapidly increased, the durability of a prefabricated part is ensured, and the circulation efficiency of a prefabricated part mould is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) The prefabricated member prepared from the solid waste based low-carbon cementing material has more than 70% of raw materials from industrial solid waste, so that the consumption of ordinary portland cement is greatly reduced, the emission of carbon dioxide is reduced, the cost of concrete is reduced, and the environment is protected;
(2) The invention combines the hydration characteristics of the solid waste base cementing material to formulate a special curing mode of 4+ N, realizes the rapid increase of the early strength of the large-dosage fly ash prefabricated member, achieves the demolding strength within 24 hours, and does not influence the later strength increase and the durability of the prefabricated member.
(3) The compression strength of the prefabricated part prepared by the method can reach 50MPa in 28 days, the strength requirements of most prefabricated parts are met, and the application field of products with large amount of fly ash is expanded.
In conclusion, the low-carbon rapid demoulding precast concrete is prepared by using the low-doping-amount cement, the large-doping-amount fly ash and the desulfurization gypsum, the problems of low strength, slow hydration and narrow application of a large-doping-amount fly ash product and the problems of large pollution, high carbon emission and high cost of a cement product are solved, a relatively proper fly ash doping amount is provided for a cementing material of the precast concrete, the solid waste utilization and environmental protection are promoted, and a technical basis is laid for large-scale popularization of the low-carbon high-efficiency cementing material.
Detailed Description
The invention provides a low-carbon rapid demoulding prefabricated part prepared from a solid waste base cementing material containing cement, fly ash and desulfurized gypsum, which comprises the following raw materials in parts by weight: 100 to 150 portions of cement, 200 to 250 portions of fly ash, 50 to 100 portions of desulfurized gypsum, 700 to 900 portions of fine aggregate, 1000 to 1200 portions of coarse aggregate, 4 to 6 portions of water reducing agent and 100 to 150 portions of water.
The raw materials for preparing the low-carbon rapid demoulding prefabricated member comprise 100-150 parts of cement, preferably 100, 110, 120, 130, 140 and 150, or any value between 100 and 150 parts. In the invention, the cement is selected from Portland 42.5 cement, and the cement meets the GB175-2007 Standard "general Portland Cement".
The raw material for preparing the low-carbon rapid demoulding prefabricated member also comprises 200-250 parts of fly ash, preferably 200, 210, 220, 230 and 24 parts of fly ash0. 250, or any value between 200 and 250 parts. In the invention, the fly ash is the fly ash which accords with GB/T1596-2017 fly ash for cement and concrete. In some embodiments of the invention, the fly ash consists essentially of: caO 6 parts, siO 2 53 parts of Al 2 O 3 26 parts of, K 2 O1 part, mgO 1 part, na 2 O1 part, fe 2 O 3 5 parts of SO 3 4 parts.
The preparation raw material of the low-carbon rapid demoulding prefabricated member also comprises 50-100 parts of desulfurized gypsum, preferably any value between 50, 60, 70, 80, 90 and 100 or between 50-100 parts. The desulfurized gypsum is an industrial byproduct which is generated by chemical reaction in power plant production and takes anhydrous and dihydrate calcium sulfate as main components. In the invention, the desulfurization gypsum is the desulfurization gypsum which accords with GB/T37785-2019 flue gas desulfurization gypsum.
The raw materials for preparing the low-carbon rapid demoulding prefabricated member also comprise 700-900 parts of fine aggregate, preferably 700, 750, 800, 850 and 900 or any value between 700-900 parts. In the invention, the fine aggregate is the fine aggregate which conforms to GB/T25176-2010 recycled fine aggregate for concrete and mortar.
The preparation raw materials of the low-carbon rapid demoulding prefabricated member also comprise 1000-1200 parts of coarse aggregate, preferably 1000, 1050, 1100, 1150 and 1200, or any value between 1000-1200 parts. In the invention, the coarse aggregate is the coarse aggregate which conforms to GB/T25177-2010 recycled coarse aggregate for concrete.
The raw materials for preparing the low-carbon rapid demoulding prefabricated part also comprise 4-6 parts of a water reducing agent, preferably 4, 4.5, 5, 5.5 and 6 or any value between 4-6 parts. In the invention, the water reducing agent is selected from polycarboxylic acid water reducing agents. The water reducing agent meets the standard of GB 8076-2008 concrete admixture.
The raw materials for preparing the low-carbon rapid demoulding prefabricated member also comprise 100-150 parts of water, preferably 100, 110, 120, 130, 140 and 150 or any value between 100-150 parts.
The invention also provides a preparation method of the prefabricated member, which comprises the following steps:
a) Mixing and grinding cement, fly ash and desulfurized gypsum to obtain a cementing material;
b) Mixing the cementing material, the fine aggregate, the coarse aggregate, the water reducing agent and water, and then pouring and forming to obtain concrete for pouring and forming;
c) And sequentially carrying out primary standard curing, curing under a heating condition, stripping and secondary standard curing on the cast concrete to obtain the low-carbon rapid demoulding prefabricated member.
Firstly, mixing and grinding cement, fly ash and desulfurized gypsum to obtain a cementing material; wherein the specific surface area of the ground raw materials is 550m 2 /kg and above.
And then, mixing the cementing material, the fine aggregate, the coarse aggregate, the water reducing agent and water, and then pouring and forming to obtain the concrete for pouring and forming. The concrete method of the casting is not particularly limited, and the method known to those skilled in the art can be used.
And then, sequentially carrying out primary standard curing, curing under a heating condition, demolding and secondary standard curing on the cast concrete to obtain the low-carbon rapid demolding prefabricated member.
In the invention, the standard curing temperature is 20 +/-2 ℃, and the humidity is higher than 90%.
The temperature of the first standard maintenance is 20 +/-1 ℃, the humidity is higher than 90%, and the time is 4 hours;
the curing temperature under the heating condition is 40-60 ℃, the humidity is higher than 90%, and the curing time is 8-20 hours;
the temperature of the second standard curing is 20 +/-2 ℃, the humidity is higher than 90%, and the curing is carried out for 1 day, 3 days, 7 days and 28 days.
By adopting the maintenance mode, the form can be removed within 12 to 24 hours.
According to the invention, a 4+ N special steam curing system is prepared through the synergistic effect of three materials of cement, fly ash and desulfurized gypsum and a segmented reaction mechanism, the early hydration rate is accelerated, the early strength is improved, the form removal within 24 hours after pouring is realized, and the problems of slow mold turnover and low utilization rate are solved.
According to the invention, by exploring a curing mechanism reaction mechanism of the low-calcium-silicon ratio cementing material, the recent curing time and curing temperature of the solid waste base cementing material containing cement, fly ash and desulfurized gypsum are determined, high-temperature curing at 40-60 ℃ is carried out before and after the initial setting time of the solid waste base cementing material, and on the basis of ensuring that the early strength of the prefabricated member reaches the demolding requirement, the damage of a pore structure caused by high-temperature curing is avoided, so that deformed crystals can be slowly recovered without influencing the later strength and durability of the prefabricated member.
The cement mixing amount in the solid waste base cementing material used by the invention is less than 30%, the 28-day strength of the prepared prefabricated member can reach 50MPa, the cement mixing amount is far lower than that of a concrete product with the same strength standard, the processing technology is simple, the steam curing time is short, the energy consumption is low, no other calcium source substances are added, and the carbon dioxide emission is far lower than that of a common prefabricated member.
The fly ash, the cement and the desulfurized gypsum are mixed and ground, and the mixture is ground until the specific surface area is 550m < 2 >/kg. By grinding materials, the reaction distance between reactants is shortened, the synergistic effect of the three materials is realized, a reaction mechanism is segmented, and the early hydration speed of the prefabricated part is effectively improved, the initial and final setting time is reduced on the basis of ensuring the durability of the prefabricated part by utilizing a 4+ N special steam curing system, namely a curing system of 4-hour standard curing, 8-20-hour high-temperature curing and subsequent standard curing, so that the demoulding within 24 hours and the 28-day strength of 50MPa are achieved. Compared with other fly ash concrete, the gypsum is added in a large amount to promote the synergistic effect of the cement, the fly ash and the gypsum, and the high-temperature curing is carried out in the early setting process at short time, so that a new idea is provided for the production of prefabricated parts and the utilization of the fly ash.
For further understanding of the present invention, the low-carbon rapid-release preform and the method for preparing the low-carbon rapid-release preform from the cement, fly ash and desulfurized gypsum-containing solid waste-based cementitious material provided by the present invention are described below with reference to the following examples, but the scope of the present invention is not limited by the following examples.
In the following examples, the cement used was selected from Portland 42.5 cement;
the used fly ash is fly ash of a thermal power plant and mainly comprises the following components: caO 6 parts, siO 2 53. Part(s) of Al 2 O 3 26 parts of, K 2 O1 part, mgO 1 part, na 2 O1 part, fe 2 O 3 5 parts of SO 3 4 parts.
The water reducing agent used is a polycarboxylic acid water reducing agent.
Example 1
(1) The material is prepared by mixing and grinding the raw materials according to the mass part, wherein 150 parts of cement, 250 parts of fly ash, 100 parts of desulfurized gypsum, 800 parts of fine aggregate, 1100 parts of coarse aggregate, 6 parts of water reducing agent and 125 parts of water are mixed and ground to 561m 2 /kg。
(2) All the raw materials are accurately weighed according to the test mixing proportion, and the water reducing agent is diluted in advance to be completely dissolved in water according to the standard of 30 percent of solid content. All the raw materials are stirred by a concrete stirrer, and are poured into a mould immediately after the stirring is finished, and the mould is fully vibrated and molded.
(3) And curing the formed concrete test block in a curing room with the temperature of 20 +/-1 ℃ and the humidity of more than 90% for 4 hours, then curing in a high-temperature curing box with the curing temperature of 55 +/-2 ℃ and the humidity of more than 90% for 20 hours, then removing the mold, and then continuously curing in the curing room with the temperature of 20 +/-2 ℃ and the humidity of more than 90% for 1 day, 3 days, 7 days and 28 days. The corresponding compressive strengths can reach 48, 59, 68 and 75MPa respectively.
The embodiment adopts the largest glue material dosage, wherein the dosages of cement, fly ash and desulfurized gypsum are all the largest, the strength can reach 48MPa by 1 day through a special curing system, the later strength increase is not influenced by high-temperature curing, the 28d compressive strength reaches 75MPa, the strength increase curve is good, and for a large-dosage solid waste base prefabricated member, the prefabricated member has extremely excellent strength performance under the condition of not adding expensive additives.
Example 2
(1) The cement is prepared by mixing and grinding the raw materials according to the mass parts, wherein 100 parts of cement and 25 parts of fly ash are mixed0 part of desulfurized gypsum, 100 parts of fine aggregate, 800 parts of coarse aggregate, 5 parts of water reducing agent and 120 parts of water, and mixing and grinding the mixture to be in a specific table 551m 2 /kg。
(2) All the raw materials are accurately weighed according to the test mixing proportion, and the water reducing agent is diluted in advance to be completely dissolved in water according to the standard of 30 percent of solid content. All the raw materials are stirred by a concrete stirrer, and are poured into a mould immediately after the stirring is finished, and the mould is fully vibrated and molded.
(3) And curing the formed concrete test block in a curing room with the temperature of 20 +/-1 ℃ and the humidity of more than 90% for 4 hours, then curing in a high-temperature curing box with the curing temperature of 50 +/-2 ℃ and the humidity of more than 90% for 12 hours, then removing the mold, and then continuously curing in the curing room with the temperature of 20 +/-2 ℃ and the humidity of more than 90% for 1 day, 3 days, 7 days and 28 days. The corresponding compressive strengths can reach 24 MPa, 33 MPa, 44 MPa and 56MPa respectively.
In the embodiment, compared with the first embodiment, the consumption of the glue material is reduced by 50 parts, the glue material is completely cement, the water consumption is reduced by 5 parts, the high-temperature curing temperature is reduced by 5 ℃, and the high-temperature curing time is shortened by 8 hours. Although the early strength is reduced by more than 50 percent, the demoulding requirement is still met, and the 28d compressive strength still reaches 56MPa, the strength of the mixture ratio is reduced, the mixture ratio better meets the industrial requirements of energy conservation, emission reduction and low carbon and green, the cement consumption is reduced, the high-temperature curing time is shortened, the product cost can be effectively reduced, and the popularization value is high.
Example 3
The invention provides a low-carbon rapid demoulding prefabricated part prepared from a low-cement cementing material and a preparation method thereof, and the method comprises the following specific steps:
(1) The cement-flyash composite material is prepared by mixing and grinding raw materials according to mass parts, wherein 120 parts of cement, 230 parts of fly ash, 85 parts of desulfurized gypsum, 800 parts of fine aggregate, 1100 parts of coarse aggregate, 5 parts of water reducing agent and 125 parts of water are mixed and ground to a specific surface of 559m 2 /kg。
(2) All the raw materials are accurately weighed according to the test mixing proportion, and the water reducing agent is diluted in advance to be completely dissolved in water according to the standard of 30 percent of solid content. All the raw materials are stirred by a concrete stirrer, and are immediately poured into a mould after the stirring is finished, and the mould is fully vibrated and molded.
(3) And (3) placing the formed concrete test block in a curing room with the temperature of 20 +/-1 ℃ and the humidity of more than 90% for curing for 4 hours, then placing the cured concrete test block in a high-temperature curing box with the curing temperature of 50 +/-2 ℃ and the humidity of more than 90% for curing for 14 hours, then removing the formwork, and then continuing placing the cured concrete test block in the curing room with the curing temperature of 20 +/-2 ℃ and the humidity of more than 90% for curing for 1 day, 3 days, 7 days and 28 days. The corresponding compressive strength can reach 42 MPa, 46 MPa, 53 MPa and 59MPa respectively.
In the embodiment, the mass parts of the raw materials and the median values of the high-temperature curing temperature and the high-temperature curing time in the claim I are taken, the early strength is not obviously reduced compared with that in the embodiment 1, the overall strength performance in the later period is reduced by about 15%, but the 28-day compressive strength still reaches 59MPa.
Example 4
The invention provides a low-carbon rapid demoulding prefabricated member prepared from a low cement cementing material and a preparation method thereof, and the method comprises the following specific steps:
(1) The material is prepared by mixing and grinding 100 parts of cement, 200 parts of fly ash, 50 parts of desulfurized gypsum, 700 parts of fine aggregate, 1000 parts of coarse aggregate, 6 parts of water reducing agent and 100 parts of water according to the mass parts until the mixture is ground to 565m 2 /kg。
(2) All the raw materials are accurately weighed according to the test mixing proportion, and the water reducing agent is diluted in advance to be completely dissolved in water according to the standard of 30 percent of solid content. All the raw materials are stirred by a concrete stirrer, and are poured into a mould immediately after the stirring is finished, and the mould is fully vibrated and molded.
(3) And curing the formed concrete test block in a curing room with the temperature of 20 +/-1 ℃ and the humidity of more than 90% for 4 hours, then curing in a high-temperature curing box with the curing temperature of 60 +/-2 ℃ and the humidity of more than 90% for 20 hours, then removing the mold, and then continuously curing in the curing room with the temperature of 20 +/-2 ℃ and the humidity of more than 90% for 1 day, 3 days, 7 days and 28 days. The corresponding compressive strength can reach 27, 35, 43 and 50MPa respectively.
In the embodiment, the lowest standard of the selectable range is selected for all the dosage, the dosage of each glue material in the proportion is greatly reduced, but through a special curing system, the early strength reduction is not obvious and still reaches 27MPa and the 28d strength reaches 50MPa compared with the embodiment 1, and the preparation method is enough for preparing a high-strength prefabricated part.
Comparative example 1
(1) The material is prepared by mixing and grinding 150 parts of cement, 250 parts of fly ash, 100 parts of desulfurized gypsum, 800 parts of fine aggregate, 1100 parts of coarse aggregate, 5 parts of water reducing agent and 125 parts of water according to the mass parts until the mixture is ground to 554m 2 /kg。
(2) All the raw materials are accurately weighed according to the test mixing proportion, and the water reducing agent is diluted in advance according to the standard of 30 percent of solid content so as to be completely dissolved in water. All the raw materials are stirred by a concrete stirrer, and are poured into a mould immediately after the stirring is finished, and the mould is fully vibrated and molded.
(3) And curing the formed concrete test block in a curing room with the temperature of 20 +/-1 ℃ and the humidity of more than 90% for 1d, then removing the mold, and then continuously curing the concrete test block in the curing room with the temperature of 20 +/-2 ℃ and the humidity of more than 90% for 1 day, 3 days, 7 days and 28 days. The corresponding compressive strength can reach 3, 21, 38 and 54MPa respectively.
The raw materials of comparative example 1 and example 1 are in parts by weight, under standard curing, the 1-day compressive strength is only 3MPa, the possibility of early form removal in engineering is not considered, and the 28-day strength is far lower than the 28-day strength of example 1.
Comparative example 2
(1) The material is prepared by mixing and grinding 150 parts of cement, 340 parts of fly ash, 10 parts of desulfurized gypsum, 800 parts of fine aggregate, 1100 parts of coarse aggregate, 5 parts of water reducing agent and 125 parts of water according to the mass parts until the ratio table is 552m2/kg.
(2) All the raw materials are accurately weighed according to the test mixing proportion, and the water reducing agent is diluted in advance to be completely dissolved in water according to the standard of 30 percent of solid content. All the raw materials are stirred by a concrete stirrer, and are poured into a mould immediately after the stirring is finished, and the mould is fully vibrated and molded.
(3) And curing the formed concrete test block in a curing room with the temperature of 20 +/-1 ℃ and the humidity of more than 90% for 4 hours, then curing in a high-temperature curing box with the curing temperature of 55 +/-2 ℃ and the humidity of more than 90% for 20 hours, then removing the mold, and then continuously curing in the curing room with the temperature of 20 +/-2 ℃ and the humidity of more than 90% for 1 day, 3 days, 7 days and 28 days.
The compressive strength can reach 42 MPa, 51 MPa, 58 MPa and 49MPa respectively.
Compared with the embodiment 1, the comparative example 2 reduces the dosage of the desulfurized gypsum to 10 parts, increases the dosage of the fly ash to 340 parts, and achieves the compressive strength of 43MPa after 1 day through a special curing system, but the strength of 28d is reduced due to the adjustment of internal crystals in the later period, so that the engineering application safety has great hidden danger.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A low-carbon rapid demoulding prefabricated member prepared from a solid waste base cementing material containing cement, fly ash and desulfurized gypsum is characterized by comprising the following raw materials in parts by weight: 100 to 150 parts of cement, 200 to 250 parts of fly ash, 50 to 100 parts of desulfurized gypsum, 700 to 900 parts of fine aggregate, 1000 to 1200 parts of coarse aggregate, 4 to 6 parts of water reducing agent and 100 to 150 parts of water.
2. A preform according to claim 1, wherein the cement is selected from Portland 42.5 cement.
3. A preform according to claim 1, wherein the fly ash is fly ash according to GB/T1596-2017 fly ash for use in cement and concrete.
4. The preform according to claim 1, wherein the desulfurized gypsum is desulfurized gypsum conforming to GB/T37785-2019 flue gas desulfurized gypsum.
5. The preform according to claim 1, wherein the fine aggregate is a fine aggregate according to GB/T25176-2010 recycled fine aggregate for concrete and mortar.
6. The preform according to claim 1, characterized in that said coarse aggregate is a coarse aggregate in accordance with GB/T25177-2010 "recycled coarse aggregate for concrete".
7. The preform of claim 1, wherein the water-reducing agent is selected from the group consisting of polycarboxylic acid water-reducing agents.
8. A method for producing a preform according to any one of claims 1 to 7, comprising the steps of:
a) Mixing and grinding cement, fly ash and desulfurized gypsum to obtain a cementing material;
b) Mixing the cementing material, the fine aggregate, the coarse aggregate, the water reducing agent and water, and then pouring and forming to obtain poured and formed concrete;
c) And sequentially carrying out primary standard curing, curing under a heating condition, stripping and secondary standard curing on the cast concrete to obtain the low-carbon rapid demoulding prefabricated member.
9. The method according to claim 8, wherein the specific surface area of the ground raw material in the step A) is 550m 2 (iv) kg and above.
10. The method of claim 8, wherein the first standard curing time is 4 hours;
the curing temperature under the heating condition is 40-60 ℃, and the curing time is 8-20 hours;
the second standard curing to 1 day, 3 days, 7 days and 28 days age.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211253546.9A CN115448680A (en) | 2022-10-13 | 2022-10-13 | Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211253546.9A CN115448680A (en) | 2022-10-13 | 2022-10-13 | Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115448680A true CN115448680A (en) | 2022-12-09 |
Family
ID=84309092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211253546.9A Pending CN115448680A (en) | 2022-10-13 | 2022-10-13 | Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115448680A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116854497A (en) * | 2023-07-13 | 2023-10-10 | 中建西部建设北方有限公司 | Cementing material for absorbing carbon dioxide and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182141A (en) * | 2007-11-14 | 2008-05-21 | 北京科技大学 | Method for preparing high-strength structure material by using iron tailings |
| JP2013014447A (en) * | 2011-06-30 | 2013-01-24 | Takenaka Komuten Co Ltd | Cement hardened body, method for manufacturing the same, and cement composition |
| CN104030634A (en) * | 2014-06-12 | 2014-09-10 | 杭州固华复合材料科技有限公司 | High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete |
| CN106278100A (en) * | 2016-08-17 | 2017-01-04 | 盐城工学院 | A kind of slag is utilized to carry out the toughness reinforcing method of gypsum increasing and goods thereof |
| CN108975788A (en) * | 2018-08-30 | 2018-12-11 | 济南大学 | A method of improving steam-cured complementary cementitious material/cement system intensity |
| CN114409361A (en) * | 2022-02-18 | 2022-04-29 | 涉县清漳水泥制造有限公司 | Premixed pump concrete prepared from fly ash and preparation method thereof |
-
2022
- 2022-10-13 CN CN202211253546.9A patent/CN115448680A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182141A (en) * | 2007-11-14 | 2008-05-21 | 北京科技大学 | Method for preparing high-strength structure material by using iron tailings |
| JP2013014447A (en) * | 2011-06-30 | 2013-01-24 | Takenaka Komuten Co Ltd | Cement hardened body, method for manufacturing the same, and cement composition |
| CN104030634A (en) * | 2014-06-12 | 2014-09-10 | 杭州固华复合材料科技有限公司 | High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete |
| CN106278100A (en) * | 2016-08-17 | 2017-01-04 | 盐城工学院 | A kind of slag is utilized to carry out the toughness reinforcing method of gypsum increasing and goods thereof |
| CN108975788A (en) * | 2018-08-30 | 2018-12-11 | 济南大学 | A method of improving steam-cured complementary cementitious material/cement system intensity |
| CN114409361A (en) * | 2022-02-18 | 2022-04-29 | 涉县清漳水泥制造有限公司 | Premixed pump concrete prepared from fly ash and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 邹玉生等: "《宁波地区城市轨道交通工程混凝土耐久性研究及应用》", 30 June 2021, 中国建材工业出版社, pages: 54 - 55 * |
| 马虎臣: "《建筑构件质量管理导论》", 30 April 1996, 地震出版社, pages: 173 - 176 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116854497A (en) * | 2023-07-13 | 2023-10-10 | 中建西部建设北方有限公司 | Cementing material for absorbing carbon dioxide and preparation method thereof |
| CN116854497B (en) * | 2023-07-13 | 2024-08-27 | 中建西部建设北方有限公司 | Cementing material for absorbing carbon dioxide and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112430051A (en) | Building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and method | |
| CN101581131B (en) | Non-autoclaved aerated concrete building block and manufacturing method | |
| CN102515673A (en) | Circulating fluidized bed boiler ash cement-based self-leveling material | |
| CN113248205A (en) | Large-mixing-amount solid waste non-steamed lightweight concrete wallboard and preparation method thereof | |
| CN101190834A (en) | Method for preparing magnesium slag aerated concrete building block added with cinder | |
| CN114988791B (en) | Flue grouting material doped with sulfur-rich lithium slag, and preparation method and application thereof | |
| CN105036677A (en) | Autoclaved aerated concrete block or plate and preparation method thereof | |
| CN112430050A (en) | Non-autoclaved aerated concrete and preparation method thereof | |
| CN115893967A (en) | Low-carbon type multi-element composite early-strength steam-curing-free concrete prefabricated part and preparation method thereof | |
| CN115448680A (en) | Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof | |
| CN113716919B (en) | Biomass ash-based steam-curing-free light foam concrete and preparation method thereof | |
| CN110981259A (en) | Additive for improving crystallinity of hydro-thermal synthesis hydrated calcium silicate | |
| CN114890809A (en) | Steel slag-based high-carbon-fixation-quantity non-autoclaved aerated concrete and preparation method thereof | |
| CN115432982B (en) | Preparation method of aerated concrete | |
| CN113929425B (en) | Building block and preparation method thereof | |
| CN116606115A (en) | Autoclaved aerated concrete block and preparation method thereof | |
| CN114988835A (en) | Carbide slag-based high-solid-carbon-content non-autoclaved aerated concrete and preparation method thereof | |
| CN114105535A (en) | Method for preparing light energy-saving wall material by sintering desulfurized ash through high-doping semidry method | |
| CN113248201A (en) | Early-strength micro-expansion ultra-high performance concrete and preparation method and application thereof | |
| CN115417654A (en) | Low-carbon early-strength steam-curing prefabricated member prepared from gasified slag and preparation method | |
| CN114524654A (en) | Phosphogypsum lightweight concrete and preparation method thereof | |
| GB1593121A (en) | Method of producing building elements | |
| CN112358255A (en) | Environment-friendly water permeable brick and preparation method thereof | |
| CN115716727B (en) | Light wall material and preparation method thereof | |
| CN115849849B (en) | Light insulation board prepared from phosphogypsum and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |