CN113754361A - Method for manufacturing viscosity-reducing concrete - Google Patents
Method for manufacturing viscosity-reducing concrete Download PDFInfo
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- CN113754361A CN113754361A CN202110964196.6A CN202110964196A CN113754361A CN 113754361 A CN113754361 A CN 113754361A CN 202110964196 A CN202110964196 A CN 202110964196A CN 113754361 A CN113754361 A CN 113754361A
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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
-
- 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
Abstract
A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 160 parts of cement 150-containing materials, 10-15 parts of slag, 10-20 parts of kaolin, 5-10 parts of nano silicon dioxide, 400 parts of coarse aggregate 300-containing materials, 350 parts of fine aggregate 300-containing materials, 5-10 parts of glass fiber, 8-10 parts of viscosity reduction type water reducing agent and 40-50 parts of water, wherein the two groups have synergistic effect to enable water reducing agent molecules to be rapidly adsorbed and dispersed on the surfaces of cement particles with charges, a layer of dispersion film is formed on the surfaces of the cement particles, the formation of the dispersion film can destroy the flocculation structure of the cement particles, the cement particles are fully dispersed and generate the effect of inhibiting agglomeration, and therefore the effect of reducing the net slurry viscosity of the cement is achieved.
Description
Technical Field
The invention relates to a method for manufacturing viscosity-reducing concrete, belonging to the technical field of concrete.
Background
The water reducing agent is a macromolecular surfactant of a molecular structure containing carboxyl graft copolymer, has a series of advantages of low mixing amount, strong dispersing capacity, good dispersion retention performance, no pollution to the environment in production and application and the like, and is generally accepted by the concrete engineering industry; with the application of high-strength concrete in a large quantity, the viscosity of fresh concrete is higher and higher, and the construction difficulty is increased year by year. In recent years, the research on viscosity-reducing water reducing agents is gradually paid attention to the field, and the existing reaction concrete has high viscosity and is difficult to pump and vibrate in engineering construction. The main reason is that when the aggregate is used for preparing concrete, the mud content of the aggregate is relatively high. The viscosity is increased, the viscosity reduction performance of the existing water reducer product is poor, and the apparent viscosity of cement paste is high; the product quality is not stable enough.
Disclosure of Invention
The invention aims to provide a method for manufacturing viscosity-reducing concrete, which aims to solve the technical problems of high viscosity, poor dispersibility, high construction difficulty and unsatisfactory concrete compressive strength of the existing concrete.
A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 150-160 parts of cement, 10-15 parts of slag, 10-20 parts of kaolin, 5-10 parts of nano silicon dioxide, 400 parts of coarse aggregate, 300-350 parts of fine aggregate, 5-10 parts of glass fiber, 8-10 parts of a viscosity-reducing water reducer, 40-50 parts of water,
the concrete preparation method comprises the steps of premixing cement, slag, kaolin and nano-silica, adding coarse aggregate, fine aggregate and glass fiber, uniformly mixing, adding a viscosity reduction type water reducer and water, stirring for 2-5 minutes to obtain the viscosity reduction type concrete,
the preparation method of the viscosity-reducing water reducer comprises the following steps:
(1) putting 100g of hydroxypropyl methacrylate, 30-60g of methyl allyl polyoxyethylene ether, 20-30g of sodium methallyl sulfonate, 5-10g of dibutyltin dilaurate and 70-90g of absolute ethyl alcohol into a reaction kettle, mixing, adjusting the pH to 8-9, adding 100g of deionized water, adding 150 g of ion-doped water, raising the temperature of the reaction kettle to 50-55 ℃, raising the pressure to 0.4-0.5 MPa, introducing ethylene oxide gas, keeping the ventilation speed at 1-1.5 mol/h for 1-1.5 h, and keeping the temperature and pressure for 1-2 h after ventilation to obtain a preformed macromonomer;
(2) adding a preformed macromonomer, hexamethylene diisocyanate and sodium lauryl alcohol ether sulfate into a reaction vessel according to the molar ratio of 1:0.25-0.5:0.2, adding water, uniformly stirring, wherein the mass ratio of the preformed macromonomer to the water is 1:2-2.5, raising the temperature to 60-70 ℃, adding ascorbic acid and thioglycollic acid, stirring for 10-15 minutes, adding sodium persulfate, continuously preserving the temperature for reaction for 1-2 hours, reducing the temperature to room temperature after the reaction is finished, adding a pH regulator, and regulating the pH to 6-6.5 to obtain the viscosity-reducing water reducer.
2. The method for preparing viscosity-reducing concrete according to claim 1, wherein the concrete is prepared from the following raw materials in proportion: 150 parts of cement, 12 parts of slag, 15 parts of kaolin, 8 parts of nano silicon dioxide, 350 parts of coarse aggregate, 320 parts of fine aggregate, 10 parts of glass fiber, 8 parts of viscosity reduction type water reducer and 45 parts of water.
In a preferred embodiment, the method for manufacturing viscosity-reducing concrete is characterized in that the pH is adjusted to 8 in the step (1).
In a preferred embodiment, the method for manufacturing viscosity reduction type concrete is characterized in that in the step (1), 100g of hydroxypropyl methacrylate, 50g of methyl allyl polyoxyethylene ether, 20g of sodium methallyl sulfonate, 6g of dibutyltin dilaurate and 80g of absolute ethyl alcohol are adopted.
In a preferred embodiment, the method for manufacturing viscosity reduction type concrete is characterized in that in the step (1), after the temperature of the reaction kettle is increased to 90 ℃, the pressure is increased to 0.4 MPa.
In a preferred embodiment, the viscosity-reducing concrete is characterized in that in the step (1), the aeration speed is 1 mol/hour, and the aeration time is 1.5 hours.
In a preferred embodiment, the method for manufacturing the viscosity-reducing concrete is characterized in that in the step (1), the temperature and pressure are kept for 2 hours
The method for manufacturing the viscosity reduction type concrete is characterized in that the preformed macromonomer, the hexamethylene diisocyanate and the sodium lauryl ether sulfate are in a molar ratio of 1:0.5: 0.2.
In a preferred embodiment, the viscosity reduction type concrete manufacturing method is characterized in that the adding amount of the ascorbic acid is 5-8% of the mass of the hexamethylene diisocyanate, the adding amount of the thioglycolic acid is 5-10% of the mass of the hexamethylene diisocyanate, and the adding amount of the sodium persulfate is 5-8% of the mass of the hexamethylene diisocyanate.
In a preferred embodiment, the method for manufacturing viscosity-reducing concrete is characterized in that a pH regulator is added in the step (2) to regulate the pH to 6.
The invention has the beneficial effects that: the hydroxypropyl methacrylate group has high ionization performance, can be quickly adsorbed to the surface of cement particles with charges, and the cement particles are quickly and uniformly dispersed under the action of electrostatic repulsion of the same charges. In addition, the polar groups have stronger hydrophilic action and are combined with water molecules to form hydrogen bonds, so that the wettability of the surface of cement particles is improved, and the water molecules are easier to permeate into narrower micropores among the particles. In addition, the adsorption capacity of sulfonic acid groups is large, the introduction of the sulfonic acid groups into the water reducing agent is favorable for improving the dispersibility of cement paste, so that the effect of improving the dispersibility is achieved, the length of a main chain is reduced, the introduction of the sulfonic acid groups is more favorable for exerting the dispersibility of hydroxypropyl methacrylate groups, the synergistic effect of the two groups enables the water reducing agent molecules to be quickly adsorbed and dispersed on the surfaces of cement particles with charges, a layer of dispersion film is formed on the surfaces of the cement particles, the formation of the dispersion film can destroy the flocculation structure of the cement particles, the cement particles are fully dispersed, the effect of inhibiting agglomeration is achieved, and the effect of reducing the viscosity of cement paste is achieved.
Detailed Description
Example 1
A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 150 parts of cement, 12 parts of slag, 15 parts of kaolin, 7 parts of nano silicon dioxide, 330 parts of coarse aggregate, 350 parts of fine aggregate, 8 parts of glass fiber, 9 parts of a viscosity reduction type water reducing agent and 45 parts of water.
The concrete preparation method comprises the steps of premixing cement, slag, kaolin and nano-silica, adding coarse aggregate, fine aggregate and glass fiber, uniformly mixing, adding a viscosity reduction type water reducer and water, stirring for 3 minutes to obtain the viscosity reduction type concrete,
the preparation method of the viscosity-reducing water reducer comprises the following steps:
(1) putting 100g of hydroxypropyl methacrylate, 50g of methyl allyl polyoxyethylene ether, 30g of sodium methallyl sulfonate, 5g of dibutyltin dilaurate and 80g of absolute ethyl alcohol into a reaction kettle, mixing, adjusting the pH to 8, adding 120 g of deionized water, raising the temperature of the reaction kettle to 50 ℃, raising the pressure to 0.5 MPa, introducing ethylene oxide gas, keeping the ventilation speed at 1 mol/h for 1.5 h, and keeping the temperature and pressure for 2 h after ventilation to obtain a preformed macromonomer;
(2) adding a preformed macromonomer, hexamethylene diisocyanate and sodium lauryl alcohol ether sulfate into a reaction vessel according to the molar ratio of 1:0.5:0.2, adding water, uniformly stirring, wherein the mass ratio of the preformed macromonomer to the water is 1: 2.5, raising the temperature to 60 ℃, adding ascorbic acid and thioglycollic acid, stirring for 15 minutes, adding sodium persulfate, continuously preserving the temperature for reaction for 2 hours, reducing the temperature to room temperature after the reaction is finished, adding a pH regulator, and regulating the pH to 6.5 to obtain the viscosity-reducing water reducer.
Example 2
A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 160 parts of cement, 10 parts of slag, 12 parts of kaolin, 6 parts of nano silicon dioxide, 370 parts of coarse aggregate, 320 parts of fine aggregate, 6 parts of glass fiber, 8 parts of viscosity reduction type water reducer and 40 parts of water.
The concrete preparation method comprises the steps of premixing cement, slag, kaolin and nano-silica, adding coarse aggregate, fine aggregate and glass fiber, uniformly mixing, adding a viscosity reduction type water reducer and water, stirring for 5 minutes to obtain the viscosity reduction type concrete,
the preparation method of the viscosity-reducing water reducer comprises the following steps:
(1) putting 100g of hydroxypropyl methacrylate, 50g of methyl allyl polyoxyethylene ether, 20g of sodium methallyl sulfonate, 6g of dibutyltin dilaurate and 90g of absolute ethyl alcohol into a reaction kettle, mixing, adjusting the pH to 8.5, adding 150 g of deionized water, raising the temperature of the reaction kettle to 55 ℃, raising the pressure to 0.45 MPa, introducing ethylene oxide gas, keeping the ventilation speed at 1.5 mol/h for 1 h, and keeping the temperature and pressure for 1 h after ventilation to obtain a preformed macromonomer;
(2) adding a preformed macromonomer, hexamethylene diisocyanate and sodium lauryl alcohol ether sulfate into a reaction vessel according to the molar ratio of 1:0.4:0.2, adding water, uniformly stirring, wherein the mass ratio of the preformed macromonomer to the water is 1:2, raising the temperature to 65 ℃, adding ascorbic acid and thioglycollic acid, stirring for 10 minutes, adding sodium persulfate, continuously carrying out heat preservation reaction for 1.5 hours, cooling to room temperature after the reaction is finished, adding a pH regulator, and regulating the pH to 6.5 to obtain the viscosity-reducing water reducer.
Example 3
A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 160 parts of cement, 15 parts of slag, 10 parts of kaolin, 8 parts of nano silicon dioxide, 380 parts of coarse aggregate, 350 parts of fine aggregate, 9 parts of glass fiber, 10 parts of a viscosity reduction type water reducing agent and 50 parts of water.
The concrete preparation method comprises the steps of premixing cement, slag, kaolin and nano-silica, adding coarse aggregate, fine aggregate and glass fiber, uniformly mixing, adding a viscosity reduction type water reducer and water, stirring for 3 minutes to obtain the viscosity reduction type concrete,
the preparation method of the viscosity-reducing water reducer comprises the following steps:
(1) putting 100g of hydroxypropyl methacrylate, 40g of methyl allyl polyoxyethylene ether, 30g of sodium methallyl sulfonate, 9g of dibutyltin dilaurate and 70g of absolute ethyl alcohol into a reaction kettle, mixing, adjusting the pH to 9, adding 150 g of deionized water, raising the temperature of the reaction kettle to 50 ℃, raising the pressure to 0.4 MPa, introducing ethylene oxide gas, keeping the ventilation speed at 1 mol/h for 1 h, and keeping the temperature and pressure for 2 h after ventilation to obtain a prefabricated macromonomer;
(2) adding a preformed macromonomer, hexamethylene diisocyanate and sodium lauryl alcohol ether sulfate into a reaction vessel according to the molar ratio of 1:0.3:0.2, adding water, uniformly stirring, wherein the mass ratio of the preformed macromonomer to the water is 1: 2.5, raising the temperature to 60 ℃, adding ascorbic acid and thioglycollic acid, stirring for 10 minutes, adding sodium persulfate, continuously preserving the temperature for reaction for 2 hours, reducing the temperature to room temperature after the reaction is finished, adding a pH regulator, and regulating the pH to 6 to obtain the viscosity-reducing water reducer.
Example 4
A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 150 parts of cement, 14 parts of slag, 16 parts of kaolin, 6 parts of nano silicon dioxide, 400 parts of coarse aggregate, 350 parts of fine aggregate, 5 parts of glass fiber, 10 parts of viscosity reduction type water reducer and 45 parts of water.
The concrete preparation method comprises the steps of premixing cement, slag, kaolin and nano-silica, adding coarse aggregate, fine aggregate and glass fiber, uniformly mixing, adding a viscosity reduction type water reducer and water, stirring for 5 minutes to obtain the viscosity reduction type concrete,
the preparation method of the viscosity-reducing water reducer comprises the following steps:
(1) putting 100g of hydroxypropyl methacrylate, 30g of methyl allyl polyoxyethylene ether, 30g of sodium methallyl sulfonate, 10g of dibutyltin dilaurate and 85g of absolute ethyl alcohol into a reaction kettle, mixing, adjusting the pH to 9, adding 140 g of deionized water, raising the temperature of the reaction kettle to 55 ℃, raising the pressure to 0.45 MPa, introducing ethylene oxide gas, wherein the aeration speed is 1.5 mol/h, the aeration time is 1.5 h, and preserving heat and pressure for 1 h after aeration to obtain a preformed macromonomer;
(2) adding a preformed macromonomer, hexamethylene diisocyanate and sodium lauryl alcohol ether sulfate into a reaction vessel according to the molar ratio of 1:0.25:0.2, adding water, uniformly stirring, wherein the mass ratio of the preformed macromonomer to the water is 1:2, raising the temperature to 60 ℃, adding ascorbic acid and thioglycollic acid, stirring for 15 minutes, adding sodium persulfate, continuously carrying out heat preservation reaction for 1 hour, cooling the temperature to room temperature after the reaction is finished, adding a pH regulator, and regulating the pH to 6 to obtain the viscosity-reducing water reducer.
Comparative example 1
The viscosity-reducing water reducer of the invention in the concrete in example 1 is replaced by a commercial viscosity-reducing water reducer, and the proportion of other concrete raw materials is the same as that in example 1.
Comparative example 2
The viscosity-reducing water reducer of the invention in the concrete in the example 2 is replaced by a commercial viscosity-reducing water reducer, and the proportion of other concrete raw materials is the same as that in the example 2.
And (3) carrying out a net slurry fluidity test on the concrete slurry for 1 hour and 2 hours according to the standard of GB/T8077-2012 test method for homogeneity of concrete admixture.
The concrete sample is tested for initial slump, 2-hour slump, slump and the slump after 2 hours, and the standard GB8076-2008 'concrete admixture' is referred to.
The concrete samples are respectively tested for 3-day compressive strength, 7-day compressive strength and 28-day compressive strength, and reference is made to the standard GB/T50081-2002 Standard of test methods for mechanical properties of ordinary concrete.
Table 1: concrete slurry and concrete type test results:
as can be seen from Table 1, the viscosity-reducing water reducer prepared according to the invention enables the net slurry fluidity of concrete slurry to have better performance in a longer time; the slump and the expansion of the concrete sample prepared by the invention have better performances than the concrete using the commercial viscosity reduction type water reducer, and the compressive strength of the concrete sample is improved due to better dispersity, so that the concrete sample can completely meet the engineering requirements of a construction site.
Claims (10)
1. A method for manufacturing viscosity-reducing concrete is characterized in that: the concrete is prepared from the following raw materials in proportion: 150-160 parts of cement, 10-15 parts of slag, 10-20 parts of kaolin, 5-10 parts of nano silicon dioxide, 400 parts of coarse aggregate, 300-350 parts of fine aggregate, 5-10 parts of glass fiber, 8-10 parts of a viscosity-reducing water reducer, 40-50 parts of water,
the concrete preparation method comprises the steps of premixing cement, slag, kaolin and nano-silica, adding coarse aggregate, fine aggregate and glass fiber, uniformly mixing, adding a viscosity reduction type water reducer and water, stirring for 2-5 minutes to obtain the viscosity reduction type concrete,
the preparation method of the viscosity-reducing water reducer comprises the following steps:
(1) putting 100g of hydroxypropyl methacrylate, 30-60g of methyl allyl polyoxyethylene ether, 20-30g of sodium methallyl sulfonate, 5-10g of dibutyltin dilaurate and 70-90g of absolute ethyl alcohol into a reaction kettle, mixing, adjusting the pH to 8-9, adding 100g of deionized water, adding 150 g of ion-doped water, raising the temperature of the reaction kettle to 50-55 ℃, raising the pressure to 0.4-0.5 MPa, introducing ethylene oxide gas, keeping the ventilation speed at 1-1.5 mol/h for 1-1.5 h, and keeping the temperature and pressure for 1-2 h after ventilation to obtain a preformed macromonomer;
(2) adding a preformed macromonomer, hexamethylene diisocyanate and sodium lauryl alcohol ether sulfate into a reaction vessel according to the molar ratio of 1:0.25-0.5:0.2, adding water, uniformly stirring, wherein the mass ratio of the preformed macromonomer to the water is 1:2-2.5, raising the temperature to 60-70 ℃, adding ascorbic acid and thioglycollic acid, stirring for 10-15 minutes, adding sodium persulfate, continuously preserving the temperature for reaction for 1-2 hours, reducing the temperature to room temperature after the reaction is finished, adding a pH regulator, and regulating the pH to 6-6.5 to obtain the viscosity-reducing water reducer.
2. The method for preparing viscosity-reducing concrete according to claim 1, wherein the concrete is prepared from the following raw materials in proportion: 150 parts of cement, 12 parts of slag, 15 parts of kaolin, 8 parts of nano silicon dioxide, 350 parts of coarse aggregate, 320 parts of fine aggregate, 10 parts of glass fiber, 8 parts of viscosity reduction type water reducer and 45 parts of water.
3. The method for producing viscosity-reducing concrete according to claim 1, wherein the pH is adjusted to 8 in the step (1).
4. The method for preparing viscosity-reducing concrete according to claim 1, wherein 100g of hydroxypropyl methacrylate, 50g of methallyl polyoxyethylene ether, 20g of sodium methallyl sulfonate, 6g of dibutyltin dilaurate and 80g of absolute ethyl alcohol are adopted in the step (1).
5. The method for preparing viscosity-reducing concrete according to claim 1, wherein in the step (1), after the temperature of the reaction kettle is increased to 90 ℃, the pressure is increased to 0.4 MPa.
6. The viscosity-reducing concrete according to claim 1, wherein in the step (1), the aeration speed is 1 mol/h, and the aeration time is 1.5 h.
7. The method for preparing viscosity-reducing concrete according to claim 1, wherein in the step (1), the temperature and pressure are maintained for 2 hours.
8. The method for preparing viscosity-reducing concrete according to claim 1, wherein the preformed macromonomer, hexamethylene diisocyanate and sodium lauryl ether sulfate are in a molar ratio of 1:0.5: 0.2.
9. The method for producing viscosity-reducing concrete according to claim 1, wherein the amount of ascorbic acid added is 5 to 8% by mass of hexamethylene diisocyanate, the amount of thioglycolic acid added is 5 to 10% by mass of hexamethylene diisocyanate, and the amount of sodium persulfate added is 5 to 8% by mass of hexamethylene diisocyanate.
10. The method for producing viscosity-reducing concrete according to claim 1, wherein a pH adjusting agent is added in the step (2) to adjust the pH to 6.
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