CN109665743B - Marble stone powder-based concrete admixture capable of reducing water bleeding and preparation method thereof - Google Patents
Marble stone powder-based concrete admixture capable of reducing water bleeding and preparation method thereof Download PDFInfo
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- CN109665743B CN109665743B CN201811505175.2A CN201811505175A CN109665743B CN 109665743 B CN109665743 B CN 109665743B CN 201811505175 A CN201811505175 A CN 201811505175A CN 109665743 B CN109665743 B CN 109665743B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Abstract
The invention relates to the field of building materials, in particular to a water secretion reducing concrete admixture mainly containing marble stone powder and a preparation method thereof, wherein the concrete admixture comprises the following components in parts by weight: 50-70 parts of modified marble powder, 10-20 parts of ultrafine fly ash, 10-20 parts of silica fume and 1-5 parts of water-retaining agent, and the preparation method comprises the steps of simultaneously adding the water-retaining agent and the silica fume into a mixer, stirring for 10-20 minutes, adding the ultrafine fly ash, stirring for 10-20 minutes, finally adding the modified marble powder, stirring for 20-30 minutes, and uniformly mixing to obtain the bleeding-reducing concrete admixture. The invention improves the flow rate of concrete and the pumping performance by introducing and optimizing the modified marble stone powder, the ultrafine fly ash and the silica fume, and simultaneously introduces the water-retaining agent to improve the homogeneity of concrete, reduce the bleeding of the concrete and improve the homogeneity of the concrete, thereby being widely applied to the construction of pumping concrete and middle and low grade concrete.
Description
Technical Field
The invention relates to the field of building materials, in particular to a water secretion reducing concrete admixture mainly comprising marble stone powder and a preparation method thereof.
Background
In recent years, with the continuous improvement of modern construction technology, the continuous refreshing of building height, the increase of labor cost and the vigorous popularization of assembly type buildings, high requirements are provided for the pumping height of pumping concrete, the filling performance of self-compacting concrete, the segregation resistance, the production efficiency of precast concrete and the apparent quality.
At present, common admixtures such as fly ash and mineral powder can improve the pumping property, filling property and fluidity in concrete, but the concrete is easy to have the defects of segregation, bleeding, floating slurry, floating foam, apparent mass and the like. In the pumping concrete, particularly in the high-grade concrete, the effects of reducing the viscosity of the concrete and increasing the pumping performance are poor.
The Minnan gold triangular area is a well-developed area of the stone processing industry, the Fujian is rapidly developed in the Fujian in the last decade, and makes great contribution to local economy, particularly, the Fujian Nanan is a core area of the stone industry in China, and over 100 million tons of stone powder waste is expected to be generated every year. Not only causes serious pollution to water and air, but also causes large pieces of land hardening, and has a plurality of problems to be solved urgently. At present, the main measures for treating the stone powder waste material are as follows: producing aerated concrete blocks and autoclaved bricks, producing additives from putty powder and producing the stone-like coating. The consumption of the waste stone powder by the method of nan' an is about 70 ten thousand tons every year, but the stone powder waste cannot be completely treated.
Disclosure of Invention
In order to solve the problems, the invention provides the water secretion reducing concrete admixture mainly containing the marble stone powder and the preparation method thereof, which can solve the discharge problem of the marble stone powder, play a role in reducing emission, improve the pumping performance of pumped concrete, improve the construction speed, improve the flowability of self-compacting concrete, improve the filling performance, reduce the concrete viscosity of a prefabricated part, improve the air bubble discharge speed, improve the apparent quality and have great significance for improving the environmental protection and the construction performance.
The technical scheme adopted by the invention is as follows: the bleeding-reducing concrete admixture mainly containing marble stone powder comprises the following components in parts by weight:
in a preferred embodiment of the invention, the preparation method comprises the following steps of adding the water-retaining agent and the silica fume into a mixer at the same time, stirring for 10-20 minutes, adding the ultrafine fly ash, stirring for 10-20 minutes, adding the modified marble powder, stirring for 20-30 minutes, and uniformly mixing to obtain the bleeding reduction type concrete admixture.
In a preferred embodiment of the invention, the preparation method of the modified marble powder comprises the steps of adding the waste marble powder into a ball mill, grinding for 20-45 minutes, dropwise adding a grinding aid in the grinding process, keeping the temperature at 60-65 ℃, preparing the modified marble powder, and modifyingThe specific surface area of the marble stone powder is 1000-1200 m2The water requirement ratio is less than 85 percent per kg, the 28d strength activity index is more than 70 percent, and the weight ratio of the marble stone powder to the grinding aid is 1000: 0.1 to 1.
In a preferred embodiment of the invention, the waste marble stone powder is obtained by grinding and drying a marble plate, the water content of the waste marble stone powder is less than 1.0%, and the specific surface area of the waste marble stone powder is 600-800 m2Per kg, CaO content 43.0% -50.0%, SiO2The content is 4.0-7.0%.
In a preferred embodiment of the invention, the ultrafine fly ash has a specific surface area of 2000-2400 m2/kg, water demand ratio less than 85%, 28d strength activity index greater than 75%.
In a preferred embodiment of the invention, the silica fume activity index is greater than 105% and the specific surface area is greater than 20m2/g。
In a preferred embodiment of the invention, the preparation method of the grinding aid comprises the steps of dropping alcohol amine, molasses, urea and glycerol into water for reaction, wherein the dropping reaction time is 0.5-2 hours, the reaction temperature is 40-55 ℃, the grinding aid is prepared after the reaction is finished, the total amount of water used in the step enables the mass concentration of a reaction product to be 5-35%, and the mass ratio of the alcohol amine to the molasses is 1: 0.5-1, wherein the dosage of the urea is 5-20% of that of the alcohol amine and the molasses solution, and the dosage of the glycerol is 1-5% of that of the alcohol amine and the molasses solution.
In a preferred embodiment of the present invention, the alcohol amine is at least one of monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, diethanolisopropanolamine, N-dimethylethanolamine, N-dibenzylethanolamine.
In a preferred embodiment of the invention, the water-retaining agent is prepared by mixing powder polycarboxylic acid water reducing agent, cellulose ether and surfactant for 20-30 minutes in a mixer, wherein the mass ratio of the powder polycarboxylic acid water reducing agent, the cellulose ether and the surfactant is 1: 0.2-0.4: 0.1-0.2.
In a preferred embodiment of the invention, the preparation method of the powder polycarboxylate superplasticizer comprises the following steps: adding a stabilizer into a polycarboxylate superplasticizer mother liquor, centrifuging at the temperature of 100-105 ℃, controlling the centrifugal revolution number to be 1800-2500 revolutions per minute, drying and spraying powder after centrifuging to prepare a powdery polycarboxylate superplasticizer, wherein the solid content of the powdery polycarboxylate superplasticizer is more than 95%, the concrete water reducing rate is 30-35% when the mixing amount is 0.5%, the 28d compressive strength ratio is more than 145%, and the mass ratio of the polycarboxylate superplasticizer mother liquor to the stabilizer is 1: 0.001 to 0.01.
In a preferred embodiment of the present invention, the cellulose ether is at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose.
In a preferred embodiment of the present invention, the surfactant is at least one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, triterpenoid saponin, and isomeric polyoxyethylene lauryl ether.
In a preferred embodiment of the present invention, the stabilizer is at least one of anhydrous sodium acetate, active anhydrous copper sulfate, magnesium sulfate, sodium sulfate, calcium sulfate, potassium carbonate.
The invention has the beneficial effects that:
1. the invention is used for pumping concrete, can reduce the pumping pressure of the pumping concrete, improve the pumping performance, does not cause the problems of segregation, bleeding and the like of the pumping concrete, reduces the abrasion of a pump truck and pumping, and improves the service life of the pump truck and a pump pipe, and the dosage of the invention is 5 to 35 percent of the total weight of the concrete cementing material.
2. The invention is used in the middle and low grade concrete, can improve the free water tension in the middle and low grade concrete, improve the continuity and stability of concrete air holes, improve the cohesiveness of the middle and low grade concrete, block capillary holes in the concrete through continuous air holes, reduce bleeding concrete, and has good homogeneity, and the dosage of the admixture is 5-35% of the total weight of the concrete cementing material.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is further illustrated and described by the following detailed description.
Example 1
(1) Preparing a grinding aid: 50.00g of triethanolamine, 60.00g of molasses, 16.00g of urea solution (urea, 84.00g of water) and 2.00g of glycerol (water, 98.00g) are added into 640.00g of water in a dropwise manner to react, the temperature is raised to 50 ℃ for reaction, and the adding time is 1h, thus obtaining the grinding aid.
(2) Preparing modified marble stone powder: adding 5000.00g of waste marble powder and 1.00g of grinding aid into a ball mill, grinding for 20 minutes, and keeping the temperature at 60 ℃ in the process to obtain the modified marble powder.
(3) Preparing a powder polycarboxylic acid water reducing agent: and adding 2.00g of anhydrous sodium acetate serving as a stabilizer into 1000.00g of the mother liquor of the polycarboxylic acid water reducing agent, controlling the temperature to be 100 ℃, and performing centrifugal drying to obtain the powdery polycarboxylic acid water reducing agent.
(4) Preparing a water-retaining agent: 100.00g of powder polycarboxylic acid water reducing agent, 20.00g of carboxymethyl cellulose, 10.00g of hydroxyethyl cellulose and 10.00g of sodium dodecyl sulfate are mixed to prepare the water-retaining agent.
(5) Preparing the materials according to the following weight ratio
20.00g of the prepared water-retaining agent and 150.00g of silica fume are mixed and stirred for 10 minutes, then 150.00g of superfine fly ash is added and stirred for 10 minutes, finally 600.00g of modified marble stone powder is added and stirred for 30 minutes, and the concrete admixture with the marble stone powder as the main component and the capability of reducing water secretion is prepared.
Example 2
(1) Preparing a grinding aid: 60.00g of N, N-dimethylethanolamine, 40.00g of diethanol monoisopropanolamine, 70.00g of molasses, 20.00g of urea solution (20.00 g of urea and 80.00g of water), and glycerol (2.50 g of glycerol and 97.50g of water) are dripped into 630.00g of water to react, the temperature is raised to 45 ℃ to react, and the dripping time is 0.75h, so that the grinding aid is prepared.
(2) Preparing modified marble stone powder: adding 5000.00g of waste marble powder and 1.20g of grinding aid into a ball mill, grinding for 25 minutes, and keeping the process at 60 ℃ to obtain the modified marble powder.
(3) Preparing a powder polycarboxylic acid water reducing agent: adding 1.50g of stabilizer active anhydrous copper sulfate and 1.00g of sodium sulfate into 1000.00g of polycarboxylic acid water reducer mother liquor, controlling the temperature to be 100 ℃, and centrifugally drying to obtain powdery polycarboxylic acid water reducer.
(4) Preparing a water-retaining agent: mixing 100.00g of powder polycarboxylic acid water reducing agent, 20.00g of carboxymethyl cellulose, 10.00g of hydroxypropyl cellulose and 10.00g of triterpenoid saponin to prepare the water-retaining agent.
(5) Preparing the materials according to the following weight ratio
30.00g of the prepared water-retaining agent and 150.00g of silica fume are mixed and stirred for 10 minutes, then 100.00g of superfine fly ash is added and stirred for 10 minutes, finally 650.00g of modified marble stone powder is added and stirred for 30 minutes, and the concrete admixture with the marble stone powder as the main component and capable of reducing water secretion is prepared.
Example 3
(1) Preparing a grinding aid: 60.00g of N, N-dibenzylethanolamine, 20.00g of diethanolamine, 20.00g of diethanol monoisopropanolamine, 70.00g of molasses, 20.00g of urea solution (20.00 g of urea and 80.00g of water), and glycerol (3.50 g of glycerol and 96.50g of water) are dripped into 630.00g of water to react, the temperature is raised to 45 ℃ to react, and the dripping time is 1.5h, thus obtaining the grinding aid.
(2) Preparing modified marble stone powder: adding 5000.00g of waste marble powder and 1.50g of grinding aid into a ball mill, grinding for 25 minutes, and keeping the process at 60 ℃ to obtain the modified marble powder.
(3) Preparing a powder polycarboxylic acid water reducing agent: and adding 1.50g of stabilizer potassium carbonate and 1.00g of anhydrous sodium acetate into 1000.00g of polycarboxylic acid water reducer mother liquor, controlling the temperature to be 100 ℃, and performing centrifugal drying to obtain powdery polycarboxylic acid water reducer.
(4) Preparing a water-retaining agent: 100.00g of powder polycarboxylic acid water reducing agent, 16.00g of carboxymethyl cellulose, 14.00g of hydroxyethyl methyl cellulose, 10.00g of sodium dodecyl sulfate and 6.00g of isomeric dodecyl alcohol polyoxyethylene ether are mixed to prepare the water-retaining agent.
(5) Preparing the materials according to the following weight ratio
40.00g of the prepared water-retaining agent and 150.00g of silica fume are mixed and stirred for 10 minutes, 200.00g of superfine fly ash is added and stirred for 10 minutes, and finally 700.00g of modified marble stone powder is added and stirred for 30 minutes to prepare the concrete admixture mainly based on the marble stone powder and capable of reducing water secretion.
Application example 1
The fineness, the fluidity ratio and the activity index of the bleeding-reducing concrete admixtures obtained in examples 1, 2 and 3 were measured according to JG/T486-.
TABLE 1 reduction of bleeding concrete admixtures test results
As can be seen from Table 1, the water secretion reducing concrete admixture based on marble stone powder of the present invention meets the general type II requirements of JG/T486-2015 concrete composite admixture.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, so that any modifications, equivalents and improvements made by the present invention as described in the specification are included in the scope of the present invention.
Claims (10)
1. The utility model provides an it is main with marble stone powder to reduce water secretion type concrete admixture which characterized in that:
the paint comprises the following components in parts by weight:
50-70 parts of modified marble stone powder
10-20 parts of ultrafine fly ash
10-20 parts of silica fume
1-5 parts of a water-retaining agent;
the water-retaining agent is prepared by mixing powder polycarboxylate superplasticizer, carboxymethyl cellulose, hydroxyethyl cellulose and sodium dodecyl sulfate;
grinding the waste marble stone powder and a grinding aid to prepare the modified marble stone powder; adding the waste marble powder into a ball mill, grinding for 20-45 minutes, dropwise adding the grinding aid in the grinding process, keeping the temperature at 60-65 ℃, and preparing the modified marble powder, wherein the specific surface area of the modified marble powder is 1000-1200 m2The water requirement ratio is less than 85 percent, the 28d strength activity index is more than 70 percent, and the weight ratio of the marble stone powder to the grinding aid is 1000: 0.1 to 1;
the preparation method of the grinding aid comprises the steps of dripping alcohol amine, molasses, urea and glycerin into water for reaction, wherein the dripping reaction time is 0.5-2 hours, the reaction temperature is 40-55 ℃, and the grinding aid is prepared after the reaction is finished.
2. The method for preparing the marbles stone powder based water secretion reducing concrete admixture according to claim 1, wherein the method comprises the following steps: the bleeding reducing concrete admixture is prepared by the following steps of adding the water retaining agent and the silica fume into a mixer at the same time, stirring for 10-20 minutes, adding the ultrafine fly ash, stirring for 10-20 minutes, adding the modified marble powder, stirring for 20-30 minutes, and uniformly mixing.
3. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 1, wherein: the specific surface area of the ultrafine fly ash is 2000-2400 m2The water requirement ratio is less than 85 percent per kg, the 28d strength activity index is more than 75 percent, the silica fume activity index is more than 105 percent, and the specific surface area is more than 20m2/g。
4. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 1, wherein: the waste marble stone powder is obtained by grinding and drying a marble plate, the water content of the waste marble stone powder is less than 1.0%, and the specific surface area of the waste marble stone powder is 600-800 m2Per kg, CaO content of 43.0-50.0%, SiO2The content is 4.0-7.0%.
5. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 4, wherein: the total amount of the water enables the mass concentration of the reaction product to be 5-35%, and the mass ratio of the alcohol amine to the molasses is 1: 0.5-1%, the dosage of the urea is 5-20% of that of the alcohol amine and the molasses solution, and the dosage of the glycerol is 1-5% of that of the alcohol amine and the molasses solution.
6. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 5, wherein: the alcohol amine is at least one of monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, diethanolisopropanolamine, N dimethylethanolamine and N, N-dibenzylethanolamine.
7. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 1, wherein: the preparation method of the water-retaining agent comprises the following steps of stirring and mixing powder polycarboxylate superplasticizer, cellulose ether and surfactant for 20-30 minutes through a mixer to obtain the water-retaining agent, wherein the mass ratio of the powder polycarboxylate superplasticizer to the cellulose ether to the surfactant is as follows: 1: 0.2-0.4: 0.1-0.2.
8. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 7, wherein: the cellulose ether is at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxyethyl methyl cellulose, and the surfactant is at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, triterpenoid saponin and isomeric dodecyl alcohol polyoxyethylene ether.
9. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 7, wherein: the preparation method of the powder polycarboxylate superplasticizer comprises the following steps: adding a stabilizer into a polycarboxylic acid water reducing agent mother liquor, centrifuging at the temperature of 100-105 ℃, controlling the centrifugal revolution at 1800-2500 revolutions per minute, drying and spraying powder after centrifuging to obtain the powdery polycarboxylic acid water reducing agent, wherein the powdery polycarboxylic acid water reducing agent contains more than 95% of solid, the concrete water reducing rate is 30-35% when the mixing amount is 0.5%, the compressive strength ratio at 28d is more than 145%, and the mass ratio of the polycarboxylic acid water reducing mother liquor to the stabilizer is 1: 0.001 to 0.01.
10. The marble stone powder-based water secretion reducing concrete admixture as claimed in claim 9, wherein: the stabilizer is at least one of anhydrous sodium acetate, active anhydrous copper sulfate, magnesium sulfate, sodium sulfate, calcium sulfate and potassium carbonate.
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| CN111908825A (en) * | 2020-07-24 | 2020-11-10 | 尧柏特种水泥技术研发有限公司 | Early strength type nano mineral admixture for concrete and preparation method thereof |
| CN112851187A (en) * | 2021-01-28 | 2021-05-28 | 科之杰新材料集团有限公司 | Enhanced concrete admixture and preparation method thereof |
| CN115819011B (en) * | 2022-10-10 | 2023-09-29 | 浙江交通资源投资集团有限公司 | Concrete water-retaining agent based on high-adsorptivity stone powder |
| CN115784661A (en) * | 2022-11-15 | 2023-03-14 | 安徽中铁工程材料科技有限公司 | Preparation method of water-retaining limestone powder |
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