CN113603402A - Method for preparing anti-carbonization concrete by using waste slurry of mixing plant - Google Patents
Method for preparing anti-carbonization concrete by using waste slurry of mixing plant Download PDFInfo
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- 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
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- 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
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Abstract
The invention relates to a method for preparing anti-carbonization concrete by using waste slurry of a mixing plant, which comprises the following specific steps: 1) mixing and ball-milling the waste slurry, water and the deflocculating and homogenizing agent in a stirring station to obtain a waste slurry treatment solution; 2) adding stone powder and silica sand according to the composition of oxides in the waste slurry of the stirring station, uniformly mixing to obtain a raw material, calcining and ball-milling the mixed raw material to obtain a calcined and ground product; 3) preparing the anti-carbonization concrete: mixing and stirring the waste slurry treatment solution, the calcined and ground product, the fly ash, the water, the composite alkaline activator and the water reducing agent, pressing and forming, and then steaming and curing to obtain the anti-carbonization concrete. The preparation process flow of the method is simple and clear, the product obtained by treating the waste slurry of the mixing station by two modes is mixed with the aggregate and the like for compression molding, the activity of the waste slurry of the mixing station can be effectively excited, and the stability of the system can be ensured by the hydration reaction of the calcined product, so that the anti-carbonization performance of the concrete is obviously improved.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to a method for preparing anti-carbonization concrete by using waste slurry of a mixing plant.
Background
In the process of the urbanization development and construction of China, the concrete plays a significant role in urban construction. In order to ensure the stable quality of the used concrete, the production of the concrete is changed from extensive production to intensive and large-scale production, so that a plurality of commercial concrete mixing stations are born, and the specialization, commercialization and socialization of the concrete production are realized. However, in the operation process of the commercial concrete mixing plant, a large amount of waste materials are inevitably generated due to stuffer, material scattering, cleaning and the like, and if the waste materials are not properly treated, the peripheral environment and the ecological system are inevitably greatly influenced. Therefore, it is necessary to develop and utilize these concrete wastes.
The waste materials are treated by the mixing plant and are usually separated by a sand-stone separation device, the separated sand-stone can be continuously recycled, and the separated slurry is continuously recycled by multi-stage sedimentation. Although the upper layer of the wastewater in the sedimentation tank basically realizes zero discharge, the lower layer of the wastewater in the sedimentation tank has higher utilization difficulty. The waste slurry is composed of hydration products of gelled materials and residual gelled material particles, has a high pH value, and still causes great pollution to the environment after being continuously buried and poured. At present, the waste slurry is utilized to prepare mineral admixture in C30 concrete, but because the waste slurry of a mixing plant is soaked in alkaline water for a long time, the hydration activity of the waste slurry is greatly reduced, the prepared mineral admixture has insufficient activity, certain damage can be caused to the strength of the concrete, and the mixing amount in the whole concrete preparation is small, so that the effective utilization can not be achieved; secondly, the viscosity of the precipitated waste slurry is high, the pumping process is difficult, and even certain damage can be caused to equipment.
The invention adopts a series of process means to carry out modification treatment on the waste slurry of the mixing plant to prepare the concrete with carbonization resistance, not only can effectively utilize the waste slurry of the commercial concrete mixing plant to solve the problem that the waste slurry of the mixing plant is difficult to treat, but also improves the strength and durability of the concrete.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for preparing anti-carbonization concrete by using waste slurry of a mixing plant aiming at the defects in the prior art,
in order to solve the technical problems, the technical scheme provided by the invention is as follows:
the method for preparing the anti-carbonization concrete by using the waste slurry of the mixing plant comprises the following specific steps:
1) wet processing of mixing station waste slurries
Mixing and ball-milling the waste slurry, water and the deflocculating and homogenizing agent for 30-60 min to obtain waste slurry treatment liquid, wherein the specific surface area of evaporation residues of the waste slurry treatment liquid is 400-500 m2/Kg；
2) Dry treatment of mixing station waste slurries
a. According to the composition of oxides in waste slurry of a stirring station, adding stone powder and silica sand, and uniformly mixing to obtain a raw material, wherein the calcium-silicon molar ratio of the raw material is 1.4-1.8: 1;
b. calcining the mixed raw material at 1400-1450 ℃ for 1-2 h, then cooling to 800 ℃ at a cooling rate of 4-6 ℃/min, preserving heat for 5-10 s, then rapidly cooling to below 400 ℃ within 30-60 s, and then cooling to room temperature along with a furnace to obtain a calcined product;
c. ball-milling the obtained calcined product for 30-60 min to obtain the fineness of 360-480 m2Kg of calcined ground product;
3) preparation of anti-carbonization concrete
Mixing and stirring the waste slurry treatment solution obtained in the step 1), the calcined and ground product obtained in the step 2), fly ash, water, a composite alkaline activator and a water reducing agent, pressing and molding the obtained mixture, and then performing steam curing and curing to obtain the carbonization-resistant concrete. Coarse aggregate, fine aggregate and the like can also be added into the mixture according to the needs. The calcined and ground product of the invention has gelling property under the action of the alkaline activator, and the product after the waste slurry treatment and the alkaline activator can generate geopolymer reaction which has good shrinkage resistance.
According to the scheme, the mixing station waste slurry in the step 1) is slurry obtained by washing mixing station waste (waste concrete) into a sedimentation tank for sedimentation, and the water content is 25-35%.
According to the scheme, the decondensation leveling agent in the step 1) is prepared from ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to the mass ratio of 1-6: 2-10: 80-90: 2-4, wherein the purity of the ethylene glycol is more than 98 wt%, and the purity of the diethanol monoisopropanolamine is more than 85 wt%. The deflocculating and homogenizing agent is used for fully dispersing the waste slurry and simultaneously improving the grinding efficiency.
According to the scheme, the mass ratio of the waste slurry, the water and the disaggregation leveling agent in the mixing station in the step 1) is 65-80: 10-15: 0.5 to 2.
According to the scheme, the stone powder in the step 2) is powder collected in the production process of limestone machine-made sand or limestone stone, wherein CaCO3Not less than 80 wt%, and has particle sizeD5016 to 25 μm. The stone powder provides a calcium source for the system, so that the calcium-silicon ratio is adjusted.
The invention uses CaO-Al in the high-temperature calcination stage2O3-SiO2The ternary phase diagram is used as reference, the molar ratio of calcium to silicon is controlled according to the content of oxide in the calcined raw material, the compositions of waste slurry, stone powder and silica sand in the calcined raw material are prepared, and CaCO of solid wastes such as waste slurry and the like is efficiently utilized3And SiO2And meanwhile, the calcined product can be effectively controlled, the temperature is kept at 800 ℃ for 5-10 s, the conversion of partial beta-dicalcium silicate to gamma-dicalcium silicate can be promoted, so that the calcined product contains a cementitious material capable of being hydrated and a silicon-calcium compound capable of resisting carbonization after quenching, and the calcined product is formed by C3S2、β-C2S and gamma-C2And S.
According to the scheme, SiO in the silica sand in the step 2)2More than or equal to 95 percent (mass percentage).
According to the scheme, the grinding balls used in the ball milling process in the step 2) are glass beads, alumina grinding balls or ceramic grinding balls, the ball-material ratio is 1-1.5, and the mass ratio of the grinding balls with the particle sizes of 7mm, 5mm and 3mm is 3: 4: 3.
according to the scheme, the fly ash in the step 3) is I or II grade fly ash, wherein SiO is2/Al2O3The mass ratio is 2.2-2.5. The fly ash is made of SiO2And Al2O3The fine glass body is mainly composed of 50-80% of glass body with high activity, and the contained aluminum ions can decompose the glass body in alkaline environment to promote the progress of geopolymer reaction.
According to the scheme, the mixture in the step 3) comprises the following raw materials in parts by mass: 200-220 parts of waste slurry treatment liquid, 300-320 parts of calcined and ground product, 45-55 parts of fly ash, 60-80 parts of water, 110-130 parts of composite alkaline activator and 0-2 parts of water reducer. And 0-1250 parts of coarse aggregate and 0-710 parts of fine aggregate can be added according to the requirement, wherein the coarse aggregate is selected from 5-19 mm continuous graded stones, and the fine aggregate is selected from one or more of natural river sand, mountain sand, lake sand and machine-made sand.
Is pressed onIn the scheme, the preparation method of the composite alkaline exciting agent in the step 3) comprises the following steps: sodium silicate, sodium hydroxide and silica sol are mixed according to the mass ratio of 78-86: 7-10: 9-12, mixing and stirring uniformly, and aging for 20-30 min to obtain the composite alkaline activator. The invention mixes sodium silicate and sodium hydroxide according to a certain proportion and ages for a period of time to excite dimer H in the solution2SiO4 2-Or trimeric silicate H3SiO4 -The content is increased, and simultaneously, the high alkalinity of the sodium hydroxide can erode the waste slurry and the fly ash to dissolve the dissolved Ca2+、Al3+The reaction generates calcium silicate hydrate gel and calcium aluminosilicate hydrate, and vice versa, the hydrolysis reaction of the sodium silicate is promoted; the added silica sol is a low-viscosity solution, and can be used for regulating and controlling SiO in the activator with sodium silicate and sodium hydroxide2/Na2The molar ratio of O and SiO produced in the further reaction2/Na2The O liquid phase is in a transition state of an ionic state and a polymerization state, which is beneficial to continuously generating calcium silicate hydrate with gelling property, and the partially incompletely reacted silica sol can react with calcium hydroxide to generate C-S-H gel in the later reaction stage, so that the later strength of the concrete is improved.
According to the scheme, the modulus of the sodium silicate is 2.0-2.3, and the Baume degree is 30-40.
According to the scheme, SiO in the silica sol2The content is 24-30 wt%.
According to the scheme, the water reducing agent in the step 3) is a polycarboxylic acid water reducing agent, and the water reducing rate is 20-28%.
According to the scheme, the steam curing conditions in the step 3) are as follows: standing for 4 hours at the temperature of 45-50 ℃ under water vapor.
According to the scheme, the curing conditions in the step 3) are as follows: the temperature is 20 +/-2 ℃, the relative humidity is more than or equal to 95 percent, and the curing is carried out for more than 3 days.
The invention also comprises the anti-carbonization concrete obtained by the method.
The invention integrates two modes of physical excitation and chemical excitation to modify the waste slurry of the mixing plant, wet grinding treatment is carried out on part of the waste slurry of the mixing plant to improve the surface property of the waste slurry, and then an exciting agent is added to excite the activity of the waste slurry; then calcining the other part of the waste slurry of the mixing plant, adding proper amount of correcting raw material stone powder, silica sand and the like to regulate and control the silicon-calcium molar ratio (Si/Ca) of the materials, mixing the two processed products with aggregate and the like, pressing to prepare concrete, and steaming and carbonizing after forming. The physical and chemical excitation methods can mutually reinforce and jointly ensure the strength of the concrete. The calcined and ground product contains a large amount of beta-type dicalcium silicate with hydration activity, which can react with water to generate amorphous hydrated calcium silicate, and when the early strength of concrete is improved, the generated calcium hydroxide can also ensure a certain alkalinity of the whole system, and particularly can ensure that stirring station waste slurry subjected to physical ball milling treatment interacts with a composite alkaline activator in an alkaline environment to slowly react to generate silicate with a stable frame structure. The other part of the calcined products of the gamma-dicalcium silicate and calcium pyrosilicate (also called as the wollastonite) has strong binding capacity with carbon dioxide, and can gradually absorb the carbon dioxide to generate calcium carbonate in the whole concrete system, thereby capturing the carbon dioxide in the calcium hydroxide, preventing the alkalinity of the system from being reduced, and filling the calcium hydroxide to improve the later strength of the concrete. The 3d compressive strength without carbonization curing is 48.7MPa, and the 3d compressive strength after carbonization curing for a period of time can reach 62 MPa.
The invention has the beneficial effects that: the preparation process flow of the method is simple and clear, the product obtained by treating the waste slurry of the mixing station by two modes is mixed with the aggregate and the like for compression molding, the activity of the waste slurry of the mixing station can be effectively excited, and the stability of the system can be ensured by the hydration reaction of the calcined product, so that the anti-carbonization performance of the concrete is obviously improved. The invention prepares the anti-carbonization concrete by using the waste slurry of the mixing plant, can effectively reduce the discharge of the waste of the mixing plant, increases the economic benefit, and provides technical support for realizing the green low-carbon cycle development of the premixed concrete industry.
Drawings
FIG. 1 is an XRD pattern of a calcined, ground product made in step 2 of example 1 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described in detail with reference to the following examples.
The waste slurry of the mixing plant used in the embodiment and the comparative example of the invention is slurry obtained by washing leaked or waste concrete in a sedimentation tank in the mixing process of the concrete in the mixing plant, and the waste slurry of the mixing plant comprises the following oxides: CaO content 35 wt%, SiO 230 wt% of Al2O3The content is 6 wt%; the purity of the used glycol is 98 percent; the purity of the used diethanol monoisopropanolamine is 85 percent; the water used is tap water; the stone powder is powder collected during the production process of limestone machine-made sand or limestone stone, wherein CaCO3Content 85 wt%, particle size D50 ═ 18 μm; SiO in the used silica sand2The content is 95 wt%; the modulus of the sodium silicate is 2.2, and the Baume degree is 35; SiO in the silica sol used2The content is 25 wt%; the fly ash is II-grade fly ash, wherein SiO is2/Al2O3The mass ratio is 2.3; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 25%; the coarse aggregate is selected from 5-19 mm continuous graded stones; the fine aggregate is selected from natural river sand and mountain sand, and the weight ratio of the fine aggregate is 3: 7, mixing and preparing.
Example 1
A method for preparing anti-carbonization concrete by using waste slurry of a mixing plant comprises the following specific steps:
1. wet processing of mixing station waste slurries
Mixing waste slurry (with the water content of 30%) in a stirring station, water and a de-coagulating leveling agent (prepared by mixing ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to the mass ratio of 3: 6: 85: 3) according to the mass ratio of 65: 15: 0.5, and grinding in a wet ball mill for 30min to obtain a waste slurry treatment solution, wherein the specific surface area of evaporation residue of the waste slurry treatment solution is 407m2/Kg；
2. Dry treatment of mixing station waste slurries
a. Adding stone powder and silica sand as correction raw materials according to the composition of oxides in the waste slurry of the stirring station, so that the calcium-silicon ratio of the raw materials is 1.4, and uniformly mixing the waste slurry of the stirring station, the stone powder and the silica sand to obtain a raw material;
b. calcining the mixed raw material at 1400 ℃ for 1h, then cooling to 800 ℃ at a cooling rate of 5 ℃/min, preserving heat for 5s, then rapidly cooling to below 400 ℃ within 30s, and then cooling to room temperature along with the furnace to obtain a calcined product;
c. ball-milling the obtained calcined product in a dry-type ball mill for 30min, wherein the used grinding balls are glass beads (the mass ratio of the particle diameter of 7mm to 5mm to 3mm is 3: 4: 3), the ball-to-material ratio is 1, and the fineness is 363m2Kg of calcined ground product;
3. concrete press forming
a. Mixing sodium silicate, sodium hydroxide and silica sol according to a mass ratio of 78: 7: 9 to obtain a compound alkaline activator, and aging for 20min for later use;
b. mixing the waste slurry treatment liquid obtained in the step 1, the calcined and ground product obtained in the step 2, fly ash, coarse aggregate, fine aggregate, water, a composite alkaline activator and a water reducing agent according to a mass ratio of 200: 300: 45: 1200: 670: 60: 110: 1.5, mixing and stirring, pressing and molding the mixture according to JG/T520 plus 2018 compression strength test method of extrusion molding concrete, preparing the mixture into a cube of 40mm multiplied by 40mm, steaming the cube at 45 ℃ for 4 hours, and curing the steamed sample for more than 3 days according to GB/T50081-2019 Standard test method of concrete physical and mechanical properties (the temperature of a standard curing box is 20 +/-2 ℃, and the relative humidity is more than or equal to 95 percent) to obtain the carbonization-resistant concrete. The samples steamed in the embodiment are subjected to carbonization test process Conditions (CO) according to GB/T50082-2009 Standard test method for testing long-term performance and durability of ordinary concrete2The concrete with the concentration of 20 +/-3 percent, the relative humidity of 70 +/-5 percent and the temperature of 20 +/-2 ℃ is carbonized for 0.5h (simulating the influence of carbon dioxide erosion on the concrete in an air environment for a long time) and then is cured (the temperature of a standard curing box is 20 +/-2 ℃ and the relative humidity is more than or equal to 95 percent) for more than 3d to obtain the concrete as the comparative sample concrete.
As shown in FIG. 1, which is an XRD pattern of the calcined and ground product obtained in step 2 of this example, it can be seen that the calcined product is represented by C3S2、β-C2S and gamma-C2And S.
The 3d compressive strength of the anti-carbonization concrete prepared by the embodiment is 43MPa, and the 3d compressive strength of the comparative sample concrete is 52MPa, which shows that the compressive strength of the concrete prepared by the embodiment is improved after carbonization, and shows that the concrete has excellent carbonization resistance and good durability.
Example 2
A method for preparing anti-carbonization concrete by using waste slurry of a mixing plant comprises the following specific steps:
1. wet processing of mixing station waste slurries
Mixing waste slurry (with the water content of 33%) in a stirring station, water and a de-coagulating leveling agent (prepared by mixing ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to the mass ratio of 2: 5: 87: 4) according to the mass ratio of 80: 15: 2, and grinding for 60min in a wet ball mill to obtain a waste slurry treatment solution, wherein the specific surface area of evaporation residues of the waste slurry treatment solution is 518m2/Kg；
2. Dry treatment of mixing station waste slurries
a. Adding stone powder and silica sand as correction raw materials according to the composition of oxides in the waste slurry of the stirring station, so that the calcium-silicon ratio of the raw materials is 1.8, and uniformly mixing the waste slurry of the stirring station, the stone powder and the silica sand to obtain a raw material;
b. calcining the mixed raw material at 1450 ℃ for 2h, then cooling to 800 ℃ at a cooling rate of 4 ℃/min, preserving the temperature for 10s, then rapidly cooling to below 400 ℃ within 60s, and then cooling to room temperature along with the furnace to obtain a calcined product, wherein the calcined product is prepared from C3S2、β-C2S and gamma-C2S;
c. ball-milling the obtained calcined product and grinding aid in a dry ball mill for 60min, wherein the grinding balls are glass beads (the mass ratio of the particle diameters of 7mm, 5mm and 3mm is 3: 4: 3), the ball-to-material ratio is 1.5, and the fineness of 493m is obtained2Kg of calcined ground product;
3. concrete press forming
a. Mixing sodium silicate, sodium hydroxide and silica sol according to a mass ratio of 86: 10: 12 to obtain a compound alkaline activator, and aging for 30min for later use;
b. and (2) mixing the waste slurry treatment liquid obtained in the step (1), the calcined and ground product obtained in the step (2), fly ash, coarse aggregate, fine aggregate, water, a composite alkaline activator and a water reducing agent according to a mass ratio of 220: 320: 55: 1250: 710: 80: 130: 2, mixing and stirring, pressing and molding the mixture by the same method as the embodiment 1, and then steaming and curing to obtain the carbonization-resistant concrete (and carbonizing the steamed sample for 4 hours and then curing the obtained concrete as the comparative sample concrete).
The compressive strength of the carbonization-resistant concrete 3d prepared by the embodiment is 40MPa, and the compressive strength of the concrete 3d of the comparison sample is 49 MPa.
Example 3
A method for preparing anti-carbonization concrete by using waste slurry of a mixing plant comprises the following specific steps:
1. wet processing of mixing station waste slurries
Mixing waste slurry (with water content of 28%) in a stirring station, water and a de-coagulating leveling agent (prepared by mixing ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to a mass ratio of 5: 8: 82: 2) according to a mass ratio of 72: 12: 1.2, and grinding in a wet ball mill for 45min to obtain a waste slurry treatment solution, wherein the specific surface area of evaporation residue of the waste slurry treatment solution is 463m2/Kg；
2. Dry treatment of mixing station waste slurries
a. Adding stone powder and silica sand as correction raw materials according to the composition of oxides in the waste slurry of the stirring station, so that the calcium-silicon ratio of the raw materials is 1.6, and uniformly mixing the waste slurry of the stirring station, the stone powder and the silica sand to obtain a raw material;
b. calcining the mixed raw material at 1425 ℃ for 1.5h, then cooling to 800 ℃ at a cooling rate of 4 ℃/min, keeping the temperature for 7s, then rapidly cooling to below 400 ℃ within 45s, and then cooling to room temperature along with the furnace to obtain a calcined product, wherein the calcined product is formed by the reaction of C3S2、β-C2S and gamma-C2S;
c. ball-milling the obtained calcined product and grinding aid in a dry ball mill for 45min, wherein the used grinding balls are glass beads (the mass ratio of the particle diameter of 7mm to 5mm to 3mm is 3: 4: 3), the ball-to-material ratio is 1.3, and the fineness of 437m is obtained2Kg of calcined ground product;
3. concrete press forming
a. Mixing sodium silicate, sodium hydroxide and silica sol according to a mass ratio of 82: 8.5: 11 to obtain a composite alkaline activator, and aging for 25min for later use;
b. mixing the waste slurry treatment liquid obtained in the step 1, the calcined and ground product obtained in the step 2, fly ash, coarse aggregate, fine aggregate, water, a composite alkaline activator and a water reducing agent according to a mass ratio of 210: 310: 50: 1225: 690: 70: 120: 1.7, mixing and stirring, pressing and molding the mixture according to the same method as the embodiment 1, and then steaming and curing to obtain the carbonization-resistant concrete (and carbonizing the steamed sample for 2 hours and then curing the obtained concrete as the comparative sample concrete).
The compressive strength of the carbonization-resistant concrete 3d prepared by the embodiment is 47MPa, and the compressive strength of the concrete 3d of the comparison sample is 55 MPa.
Example 4
A method for preparing anti-carbonization concrete by using waste slurry of a mixing plant comprises the following specific steps:
1. wet processing of mixing station waste slurries
Mixing waste slurry (with water content of 26%) in a stirring station, water and a de-coagulating leveling agent (prepared by mixing ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to a mass ratio of 3: 2: 87: 4) according to a mass ratio of 70: 12: 1, grinding for 40min in a wet ball mill to obtain a waste slurry treatment solution, wherein the specific surface area of evaporation residues of the waste slurry treatment solution is 405m2/Kg；
2. Dry treatment of mixing station waste slurries
a. Adding stone powder and silica sand as correction raw materials according to the composition of oxides in the waste slurry of the stirring station, so that the calcium-silicon ratio of the raw materials is 1.5, and uniformly mixing the waste slurry of the stirring station, the stone powder and the silica sand to obtain a raw material;
b. calcining the mixed raw material at 1420 deg.C for 1.2h, cooling to 800 deg.C at a cooling rate of 6 deg.C/min, holding for 6s, rapidly cooling to 400 deg.C within 40s, and furnace cooling to room temperature to obtain calcined product3S2、β-C2S and gamma-C2S;
c. ball-milling the obtained calcined product and grinding aid in a dry ball mill for 40min, wherein the grinding is carried outThe balls are glass beads (the mass ratio of the particle diameter of 7mm to 5mm to 3mm is 3: 4: 3), the ball material ratio is 1.2, and the fineness is 388m2Kg of calcined ground product;
3. concrete press forming
a. Mixing sodium silicate, sodium hydroxide and silica sol according to a mass ratio of 80: 8: 10 to obtain a compound alkaline activator, and aging for 23min for later use;
b. and (2) mixing the waste slurry treatment liquid obtained in the step (1), the calcined and ground product obtained in the step (2), fly ash, coarse aggregate, fine aggregate, water, a composite alkaline activator and a water reducing agent in a mass ratio of 207: 315: 47: 1220: 680: 69: 117: 1.6 mixing and stirring, pressing and molding the mixture according to the same method as the embodiment 1, and then steaming and curing to obtain the carbonization-resistant concrete (and carbonizing the steamed sample for 3 hours and then curing the obtained concrete as the comparative sample concrete).
The 3d compressive strength of the anti-carbonization concrete prepared by the embodiment is 45MPa, and the 3d compressive strength of the comparative sample concrete is 54 MPa.
Example 5
A method for preparing anti-carbonization concrete by using waste slurry of a mixing plant comprises the following specific steps:
1. wet processing of mixing station waste slurries
Mixing waste slurry (with water content of 26%) in a stirring station, water and a de-coagulating leveling agent (prepared by mixing ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to a mass ratio of 3: 9: 82: 2) according to a mass ratio of 78: 14: 1.7, grinding in a wet ball mill for 50min to obtain a waste slurry treatment solution, wherein the specific surface area of evaporation residues of the waste slurry treatment solution is 485m2/Kg；
2. Dry treatment of mixing station waste slurries
a. Adding stone powder and silica sand as correction raw materials according to the composition of oxides in the waste slurry of the stirring station, so that the calcium-silicon ratio of the raw materials is 1.7, and uniformly mixing the waste slurry of the stirring station, the stone powder and the silica sand to obtain a raw material;
b. calcining the mixed raw materials at 1440 deg.C for 1.8h, cooling to 800 deg.C at a cooling rate of 4 deg.C/min, maintaining for 9s, and rapidly cooling within 50sTo below 400 ℃, and then cooling to room temperature along with the furnace to obtain a calcined product, wherein the calcined product is formed by C3S2、β-C2S and gamma-C2S;
c. ball-milling the obtained calcined product and grinding aid in a dry ball mill for 50min, wherein the grinding balls are glass beads (the mass ratio of the particle diameter of 7mm to 5mm to 3mm is 3: 4: 3), the ball-to-material ratio is 1.1, and the fineness of 461m is obtained2Kg of calcined ground product;
3. concrete press forming
a. Mixing sodium silicate, sodium hydroxide and silica sol according to a mass ratio of 82: 9: 11 to obtain a compound alkaline activator, and aging for 28min for later use;
b. and (2) mixing the waste slurry treatment liquid obtained in the step (1), the calcined and ground product obtained in the step (2), fly ash, coarse aggregate, fine aggregate, water, a composite alkaline activator and a water reducing agent according to a mass ratio of 215: 317: 53: 1245: 700: 72: 122: 1.8, mixing and stirring, pressing and molding the mixture according to the same method as the embodiment 1, and then steaming and curing to obtain the carbonization-resistant concrete (and carbonizing the steamed sample for 3.2 hours and then curing the obtained concrete as the comparative sample concrete).
The 3d compressive strength of the anti-carbonization concrete prepared by the embodiment is 41MPa, and the 3d compressive strength of the comparative sample concrete is 50 MPa.
Claims (10)
1. A method for preparing anti-carbonization concrete by using waste slurry of a mixing plant is characterized by comprising the following specific steps:
1) wet processing of mixing station waste slurries
Mixing and ball-milling the waste slurry, water and the deflocculating and homogenizing agent for 30-60 min to obtain waste slurry treatment liquid, wherein the specific surface area of evaporation residues of the waste slurry treatment liquid is 400-500 m2/Kg；
2) Dry treatment of mixing station waste slurries
a. According to the composition of oxides in waste slurry of a stirring station, adding stone powder and silica sand, and uniformly mixing to obtain a raw material, wherein the calcium-silicon molar ratio of the raw material is 1.4-1.8: 1;
b. calcining the mixed raw material at 1400-1450 ℃ for 1-2 h, then cooling to 800 ℃ at a cooling rate of 4-6 ℃/min, preserving heat for 5-10 s, then rapidly cooling to below 400 ℃ within 30-60 s, and then cooling to room temperature along with a furnace to obtain a calcined product;
c. ball-milling the obtained calcined product for 30-60 min to obtain the fineness of 360-480 m2Kg of calcined ground product;
3) preparation of anti-carbonization concrete
Mixing and stirring the waste slurry treatment solution obtained in the step 1), the calcined and ground product obtained in the step 2), fly ash, water, a composite alkaline activator and a water reducing agent, pressing and molding the obtained mixture, and then performing steam curing and curing to obtain the carbonization-resistant concrete.
2. The method for preparing the anti-carbonization concrete by using the waste slurry of the mixing plant according to claim 1, wherein the waste slurry of the mixing plant in the step 1) is slurry obtained by washing waste materials of the mixing plant into a sedimentation tank for sedimentation, and the water content is 25-35%.
3. The method for preparing the carbonization-resistant concrete by using the waste slurry of the mixing plant according to claim 1, wherein the de-coagulation leveling agent in the step 1) is prepared from ethylene glycol, diethanol monoisopropanolamine, water and a polycarboxylic acid water reducing agent according to a mass ratio of 1-6: 2-10: 80-90: 2-4, wherein the purity of the ethylene glycol is more than 98 wt%, and the purity of the diethanol monoisopropanolamine is more than 85 wt%.
4. The method for preparing the anti-carbonization concrete by using the mixing station waste slurry according to claim 1, wherein the mixing station waste slurry, the water and the disaggregation leveling agent in the step 1) have a mass ratio of 65-80: 10-15: 0.5 to 2.
5. The method for preparing anti-carbonization concrete using the waste slurry of mixing plant as claimed in claim 1, wherein the stone powder of step 2) is limestone machine-made sand or powder collected during the production of limestone stone, wherein CaCO3Not less than 80 percent and particle diameter D5016-25 μm; the siliconSiO in sand2More than or equal to 95 percent; the grinding balls used in the ball milling process are glass beads, alumina grinding balls or ceramic grinding balls, the ball-to-material ratio is 1-1.5, and the mass ratio of the grinding balls with the particle sizes of 7mm, 5mm and 3mm is 3: 4: 3.
6. the method for preparing anti-carbonization concrete by using the waste slurry of the mixing plant as claimed in claim 1, wherein the fly ash of step 3) is class i or II fly ash, wherein SiO is2/Al2O3The mass ratio is 2.2-2.5.
7. The method for preparing the anti-carbonization concrete by using the waste slurry of the mixing plant according to claim 1, wherein the raw materials of the mixture in the step 3) comprise the following components in parts by mass: 200-220 parts of waste slurry treatment liquid, 300-320 parts of calcined and ground product, 45-55 parts of fly ash, 60-80 parts of water, 110-130 parts of composite alkaline activator and 0-2 parts of water reducer.
8. The method for preparing the anti-carbonization concrete by using the mixing station waste slurry according to claim 1, wherein the preparation method of the composite alkali-activating agent in the step 3) is as follows: sodium silicate, sodium hydroxide and silica sol are mixed according to the mass ratio of 78-86: 7-10: 9-12, mixing and stirring uniformly, and aging for 20-30 min to obtain a composite alkaline activator; the modulus of the sodium silicate is 2.0-2.3, and the Baume degree is 30-40; SiO in the silica sol2The content is 24-30 wt%.
9. The method for preparing the anti-carbonization concrete by using the waste slurry of the mixing plant according to claim 1, wherein the water reducing agent in the step 3) is a polycarboxylic acid water reducing agent, and the water reducing rate is 20-28%; the steam curing conditions are as follows: standing for 4 hours at the temperature of 45-50 ℃ under water vapor; the maintenance conditions are as follows: the temperature is 20 +/-2 ℃, the relative humidity is more than or equal to 95 percent, and the curing is carried out for more than 3 days.
10. Carbonation resistant concrete obtainable according to the process of any one of claims 1 to 9.
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