CN111825368A - Concrete with good workability and preparation method thereof - Google Patents
Concrete with good workability and preparation method thereof Download PDFInfo
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- CN111825368A CN111825368A CN201910314456.8A CN201910314456A CN111825368A CN 111825368 A CN111825368 A CN 111825368A CN 201910314456 A CN201910314456 A CN 201910314456A CN 111825368 A CN111825368 A CN 111825368A
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides concrete with good workability and a preparation method thereof, belonging to the field of concrete. The raw materials of the concrete with good workability provided by the invention comprise a brand-new glue reducing agent, and the glue reducing agent is prepared from alcohol amine compounds, quaternary ammonium salt surfactants, lignin or derivatives thereof, tannic acid and water. The best results are obtained when the lignin derivatives are sulfonated lignin treated with horseradish peroxidase. In addition, the gel reducer has better workability when being used together with a naphthalene water reducer. The concrete provided by the invention has the best initial slump reaching 220 mm.
Description
Technical Field
The invention belongs to the field of concrete, and particularly relates to concrete with good workability and a preparation method thereof.
Background
The common concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening. In concrete, sand and stone act as a framework, called aggregate; the cement and water form cement paste, and the cement paste wraps the surface of the aggregate and fills gaps of the aggregate. Before hardening, the cement slurry plays a role in lubrication, so that the mixture is endowed with certain workability, and the construction is convenient. After the cement slurry is hardened, the aggregate is cemented into a solid whole.
The workability refers to the property that newly-mixed cement concrete is easy to be subjected to construction operation (stirring, transportation, pouring, tamping and the like) in each process, can obtain uniform quality and compact forming, and has the meanings of fluidity, cohesiveness and water-retaining property. Also known as workability of concrete. Workability is a comprehensive technical property, and is closely related to the construction process. Generally, the three aspects of fluidity, water retention and cohesiveness are included.
1. The fluidity refers to the property that fresh concrete can flow under the action of dead weight or mechanical vibration and uniformly and compactly fill the template. The fluidity reflects the degree of thickness of the mixture. If the concrete mixture is too dry and thick, the fluidity is poor, and the concrete mixture is difficult to vibrate and compact; if the mixture is too thin, the fluidity is good, but the phenomenon of delamination and segregation is easy to occur.
2. Cohesiveness refers to the property that certain cohesiveness exists among the constituent materials of the fresh concrete, and the phenomena of layering and segregation cannot occur in the construction process. Cohesiveness reflects the uniformity of the concrete mix. If the cohesiveness of the concrete mixture is poor, aggregates in the concrete are easily separated from cement paste, so that the concrete is not uniform, and phenomena such as honeycombs and cavities can occur after vibration.
3. The water retention refers to the property that the fresh concrete has certain water retention capacity and does not cause serious bleeding phenomenon in the construction process. The water retention reflects the stability of the concrete mixture. A water permeable channel is easily formed in the concrete with poor water retention, the compactness of the concrete is influenced, and the strength and the durability of the concrete are reduced.
The workability of the fresh concrete is the comprehensive reflection of the fluidity, the cohesiveness and the water-retaining property, and the fluidity, the cohesiveness and the water-retaining property of the fresh concrete are mutually linked and often contradictory. Therefore, under the condition of a certain construction process, the workability of the fresh concrete is unified by the contradiction of the properties in the three aspects.
The existing cement material has fine particles, and when the cement particles meet mixing water, the cement particles are mutually interacted under the action of electrostatic attraction and the like, so that a three-dimensional flocculation structure is formed. About 10% -30% of the mixing water is wrapped in the flocculation structure and can not freely flow, so that the lubricating effect is lost, and the fluidity of the mixture is greatly reduced. Ordinary water reducing agents cannot effectively disperse flocculation structures of ultrafine particles, and according to research, concrete glue reducing agents can disperse the flocculation structures, so that cement particles are more fully contacted with water, and the reaction activity of the cement particles is improved. The concrete gel reducing agent can also fully activate mineral admixtures with potential activity, thereby improving the hydration degree of the cementing material and achieving the purpose of improving the concrete strength or reducing the cement consumption.
The prior research shows that the gel reducing agent can have great influence on the workability of concrete. The prior art does not have a size reducer using lignin as a main component.
Disclosure of Invention
The invention provides concrete with good workability and a preparation method thereof. The concrete provided by the invention contains a brand-new glue reducing agent, and the glue reducing agent is matched with the water reducing agent, so that the mechanical property of the concrete can be still ensured while the using amount of cement is reduced. The glue reducing agent has simple components, low cost and convenient preparation.
Specifically, the invention is realized by the following technical scheme:
a concrete with good workability, which comprises a gel reducing agent;
the gel reducing agent is prepared from 10-20 parts of alcohol amine compounds, 0.5-2 parts of quaternary ammonium salt surfactants, 2-10 parts of lignin or derivatives thereof, 2-10 parts of tannic acid and 20-30 parts of water in parts by weight.
Preferably, the alcohol amine compound is selected from any one of butyl ethanolamine, methyl diethanolamine, diacetyl ethanolamine or tert-butyl ethanolamine.
Preferably, the quaternary amine surfactant is selected from any one of dodecyl trimethyl ammonium bromide, tridecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, pentadecyl trimethyl ammonium bromide or hexadecyl trimethyl ammonium bromide.
The concrete with good workability also comprises a water reducing agent.
Preferably, the water reducing agent is a naphthalene water reducing agent.
Preferably, the preparation method of the lignin derivative comprises the following steps:
s1, dissolving 2-5 parts by weight of lignin in 8-10 parts of 20-30 wt% sodium hydroxide aqueous solution, heating to 60-80 ℃, adding 0.5-1 part of 20-40 wt% formaldehyde aqueous solution, stirring for 1-3 hours, heating to 80-100 ℃, adding 0.5-2 parts of sodium sulfite, stirring for 1-3 hours, adjusting the pH value to 6-7 by using 1-2mol/L sulfuric acid, and freeze-drying to obtain sulfonated lignin;
s2, preparing sulfonated lignin into 10-20g/L aqueous solution, adding horseradish peroxidase to enable the concentration of the horseradish peroxidase in the water to be 2-3g/L, adding hydrogen peroxide with the mass fraction of 22-30% and the total volume of 2-3%, stirring for 1-3 hours at 25-30 ℃, heating for 5-10 minutes at 90-100 ℃, adjusting the pH value to 1-2 by using 1-2mol/L sulfuric acid, filtering to obtain a solid, and freeze-drying to obtain the sulfonated lignin.
Preferably, the preparation method of the gel reducing agent comprises the following steps;
grinding lignin or its derivatives into powder, sieving, dispersing in water, adding tannic acid, adjusting pH to 10-11 with sodium hydroxide solid, heating to 60-80 deg.C, holding for 5-10 hr, adding alcohol amine compound and quaternary ammonium salt surfactant, naturally cooling to room temperature, and adjusting pH to 6-7 with 0.5-2mol/L sulfuric acid.
The concrete with good workability comprises, by weight, 150-180 parts of cement, 80-100 parts of fly ash, 800-850 parts of sand, 1000-1100 parts of stone, 150-200 parts of water, 3-10 parts of a water reducing agent and 1-3 parts of a gel reducing agent.
The concrete with good workability comprises, by weight, 150-180 parts of cement, 80-100 parts of fly ash, 800-850 parts of sand, 1000-1100 parts of gravel, 150-200 parts of water, 3-6 parts of a water reducing agent and 1.5-2 parts of a gel reducing agent.
The preparation method of the concrete with good workability comprises the following steps:
mixing cement, fly ash, sand, pebbles, a water reducing agent and a glue reducing agent, adding water, and stirring for 30-60 minutes.
The invention has the advantages that: the strength of concrete depends to some extent on the particle size of its cementitious material and its structure. The invention provides the effective matching of the water reducing agent and the glue reducing agent in the concrete, and the lignin or the derivatives thereof contain proper molecular weight and polar functional groups, thereby being beneficial to forming steric hindrance and electrostatic force and effectively dispersing gelled material particles. The silicate-quaternary ammonium salt surfactant component in the cement forms core and is condensed to form spherical particles, calcium ions in the system are chemically bonded with silicate ions to finally form calcium salt precipitate, the precipitate has silicate submicron particles in a submicron size range, the stability of a concrete system is facilitated, and finally prepared concrete has good workability.
In addition, lignin is generally regarded as an environmentally unfriendly compound which, by being insoluble in water, is soluble only in some highly polar organic solvents, and thus although the modified lignin has good dispersibility, it cannot be used in size reducers. However, after proper modification and addition of tannic acid, the lignin modifier can be dissolved in a water-based solvent surprisingly and in a considerable amount, so that the lignin modifier can be successfully applied to the size reducing agent and achieves good effect.
Detailed Description
The present invention is further illustrated by the following detailed description of specific embodiments, which are provided for the purpose of illustration only and are not to be construed as limiting the invention.
Specifically, the raw material sources used in the following examples are as follows:
cement, 42.5 ordinary portland cement.
Fly ash, class II fly ash.
Sand, river sand with fineness modulus of 2.5.
Pebbles, 5-25mm continuous graded broken stones.
Naphthalene water reducing agent, FDN-C naphthalene water reducing agent produced by Shenyang Xingzheng and chemical Co.
A polycarboxylic acid water reducing agent, and HW-1 type polycarboxylic acid water reducing agent produced by Hangzhou Wuwei concrete admixture company Limited.
Lignin, made from pine, is available from Jilin paper industries, Inc.
Horseradish peroxidase, purchased from Shanghai Weiqing Biotech Co., Ltd., having an enzymatic activity of 12700U/g, was stored at-20 ℃ before use.
Example 1
The concrete with good workability is prepared from 155 parts by weight of cement, 90 parts by weight of fly ash, 825 parts by weight of sand, 1000 parts by weight of pebbles, 180 parts by weight of water, 4 parts by weight of water reducing agent and 1.5 parts by weight of glue reducing agent.
The water reducing agent is a naphthalene water reducing agent.
The raw materials of the gel reducing agent comprise 15 parts of methyldiethanolamine, 1.2 parts of hexadecyl trimethyl ammonium bromide, 6 parts of lignin, 6 parts of tannic acid and 25 parts of water in parts by weight.
Grinding lignin into powder, sieving with a 500-mesh sieve, dispersing in water, adding tannic acid, adjusting pH to 11 with sodium hydroxide solid, heating to 70 ℃, keeping for 8 hours, adding methyldiethanolamine and hexadecyltrimethylammonium bromide, naturally cooling to room temperature, and adjusting pH to 7 with 1mol/L sulfuric acid.
The preparation method of the concrete with good workability comprises the steps of mixing cement, fly ash, sand, stones, a water reducing agent and a glue reducing agent, adding water, stirring at 15rpm for 45 minutes, and pouring according to actual needs.
Example 2
The concrete with good workability is prepared from 155 parts by weight of cement, 90 parts by weight of fly ash, 825 parts by weight of sand, 1000 parts by weight of pebbles, 180 parts by weight of water, 4 parts by weight of water reducing agent and 1.5 parts by weight of glue reducing agent.
The water reducing agent is a naphthalene water reducing agent.
The raw materials of the gel reducing agent comprise 15 parts of methyldiethanolamine, 1.2 parts of hexadecyl trimethyl ammonium bromide, 6 parts of sulfonated lignin, 6 parts of tannic acid and 25 parts of water in parts by weight.
The preparation method of the sulfonated lignin comprises the steps of dissolving 3 parts by weight of lignin in 10 parts by weight of 20 wt% sodium hydroxide aqueous solution, heating to 70 ℃, adding 06 parts by weight of 25 wt% formaldehyde aqueous solution, stirring at 300rpm for 2 hours, heating to 90 ℃, adding 1 part by weight of sodium sulfite, stirring at 300rpm for 2 hours, adjusting the pH value to 6 by using 1mol/L sulfuric acid, and freeze-drying at the temperature of-4 ℃/15Pa for 6 hours to obtain the sulfonated lignin.
The preparation method of the glue reducing agent comprises the steps of grinding the sulfonated lignin into powder, sieving the powder by a sieve of 500 meshes, dispersing the powder in water, adding tannic acid, adjusting the pH value to 11 by using sodium hydroxide solid, heating the solution to 70 ℃, keeping the temperature for 8 hours, adding methyldiethanolamine and hexadecyl trimethyl ammonium bromide, naturally cooling the solution to room temperature, and adjusting the pH value to 7 by using 1mol/L sulfuric acid.
The preparation method of the concrete with good workability comprises the steps of mixing cement, fly ash, sand, stones, a water reducing agent and a glue reducing agent, adding water, stirring at 15rpm for 45 minutes, and pouring according to actual needs.
Example 3
The concrete with good workability is prepared from 155 parts by weight of cement, 90 parts by weight of fly ash, 825 parts by weight of sand, 1000 parts by weight of pebbles, 180 parts by weight of water, 4 parts by weight of water reducing agent and 1.5 parts by weight of glue reducing agent.
The water reducing agent is a naphthalene water reducing agent.
The raw materials of the gel reducing agent comprise 15 parts of methyldiethanolamine, 1.2 parts of hexadecyl trimethyl ammonium bromide, 6 parts of lignin derivatives, 6 parts of tannic acid and 25 parts of water in parts by weight.
The preparation method of the lignin derivative comprises the following steps
S1, dissolving 3 parts by weight of lignin in 10 parts of 20 wt% sodium hydroxide aqueous solution, heating to 70 ℃, adding 0.6 part of 25 wt% formaldehyde aqueous solution, stirring at 300rpm for 2 hours, heating to 90 ℃, adding 1 part of sodium sulfite, stirring at 300rpm for 2 hours, adjusting the pH value to 6 by using 1mol/L sulfuric acid, and freeze-drying at-4 ℃/15Pa for 6 hours to obtain sulfonated lignin;
s2, preparing sulfonated lignin into a 15g/L aqueous solution, adding horseradish peroxidase to enable the concentration of the horseradish peroxidase in the water to be 2.5g/L, adding hydrogen peroxide with the total volume of 3% and the mass fraction of 25%, stirring for 2 hours at 300rpm at 25 ℃, heating for 8 minutes at 95 ℃, adjusting the pH value to 1 by using 1mol/L sulfuric acid, sieving by using a 500-mesh sieve to obtain a solid, and freeze-drying for 6 hours at the temperature of-4 ℃/15Pa to obtain the sulfonated lignin.
The preparation method of the glue reducing agent comprises the steps of grinding the lignin derivatives into powder, sieving the powder by a sieve of 500 meshes, dispersing the powder in water, adding tannic acid, adjusting the pH value to 11 by using sodium hydroxide solids, heating the solution to 70 ℃, keeping the temperature for 8 hours, adding methyldiethanolamine and hexadecyltrimethylammonium bromide, naturally cooling the solution to room temperature, and adjusting the pH value to 7 by using 1mol/L sulfuric acid.
The preparation method of the concrete with good workability comprises the steps of mixing cement, fly ash, sand, stones, a water reducing agent and a glue reducing agent, adding water, stirring at 15rpm for 45 minutes, and pouring according to actual needs.
Example 4
The concrete with good workability is prepared from 155 parts by weight of cement, 90 parts by weight of fly ash, 825 parts by weight of sand, 1000 parts by weight of pebbles, 180 parts by weight of water, 4 parts by weight of water reducing agent and 1.5 parts by weight of glue reducing agent.
The water reducing agent is a polycarboxylic acid water reducing agent.
The raw materials of the gel reducing agent comprise 15 parts of methyldiethanolamine, 1.2 parts of hexadecyl trimethyl ammonium bromide, 6 parts of sulfonated lignin, 6 parts of tannic acid and 25 parts of water in parts by weight.
The preparation method of the sulfonated lignin comprises the steps of dissolving 3 parts by weight of lignin in 10 parts by weight of 20 wt% sodium hydroxide aqueous solution, heating to 70 ℃, adding 06 parts by weight of 25 wt% formaldehyde aqueous solution, stirring at 300rpm for 2 hours, heating to 90 ℃, adding 1 part by weight of sodium sulfite, stirring at 300rpm for 2 hours, adjusting the pH value to 6 by using 1mol/L sulfuric acid, and freeze-drying at the temperature of-4 ℃/15Pa for 6 hours to obtain the sulfonated lignin.
The preparation method of the glue reducing agent comprises the steps of grinding the sulfonated lignin into powder, sieving the powder by a sieve of 500 meshes, dispersing the powder in water, adding tannic acid, adjusting the pH value to 11 by using sodium hydroxide solid, heating the solution to 70 ℃, keeping the temperature for 8 hours, adding methyldiethanolamine and hexadecyl trimethyl ammonium bromide, naturally cooling the solution to room temperature, and adjusting the pH value to 7 by using 1mol/L sulfuric acid.
The preparation method of the concrete with good workability comprises the steps of mixing cement, fly ash, sand, stones, a water reducing agent and a glue reducing agent, adding water, stirring at 15rpm for 45 minutes, and pouring according to actual needs.
Example 5
The concrete with good workability is prepared from 155 parts by weight of cement, 90 parts by weight of fly ash, 825 parts by weight of sand, 1000 parts by weight of pebbles, 180 parts by weight of water, 4 parts by weight of water reducing agent and 1.5 parts by weight of glue reducing agent.
The water reducing agent is a polycarboxylic acid water reducing agent.
The raw materials of the gel reducing agent comprise 15 parts of methyldiethanolamine, 1.2 parts of hexadecyl trimethyl ammonium bromide, 6 parts of lignin derivatives, 6 parts of tannic acid and 25 parts of water in parts by weight.
The preparation method of the lignin derivative comprises the following steps
S1, dissolving 3 parts by weight of lignin in 10 parts of 20 wt% sodium hydroxide aqueous solution, heating to 70 ℃, adding 0.6 part of 25 wt% formaldehyde aqueous solution, stirring at 300rpm for 2 hours, heating to 90 ℃, adding 1 part of sodium sulfite, stirring at 300rpm for 2 hours, adjusting the pH value to 6 by using 1mol/L sulfuric acid, and freeze-drying at-4 ℃/15Pa for 6 hours to obtain sulfonated lignin;
s2, preparing sulfonated lignin into a 15g/L aqueous solution, adding horseradish peroxidase to enable the concentration of the horseradish peroxidase in the water to be 2.5g/L, adding hydrogen peroxide with the total volume of 3% and the mass fraction of 25%, stirring for 2 hours at 300rpm at 25 ℃, heating for 8 minutes at 95 ℃, adjusting the pH value to 1 by using 1mol/L sulfuric acid, sieving by using a 500-mesh sieve to obtain a solid, and freeze-drying for 6 hours at the temperature of-4 ℃/15Pa to obtain the sulfonated lignin.
The preparation method of the glue reducing agent comprises the steps of grinding the lignin derivatives into powder, sieving the powder by a sieve of 500 meshes, dispersing the powder in water, adding tannic acid, adjusting the pH value to 11 by using sodium hydroxide solids, heating the solution to 70 ℃, keeping the temperature for 8 hours, adding methyldiethanolamine and hexadecyltrimethylammonium bromide, naturally cooling the solution to room temperature, and adjusting the pH value to 7 by using 1mol/L sulfuric acid.
The preparation method of the concrete with good workability comprises the steps of mixing cement, fly ash, sand, stones, a water reducing agent and a glue reducing agent, adding water, stirring at 15rpm for 45 minutes, and pouring according to actual needs.
Test example 1
Testing of compression strength ratio of gel reducing agent
The compression strength ratio of the rubber reducing agents prepared in examples 1 to 3 was measured by the method described in GB 8076-2008.
The test results are shown in table 1.
TABLE 1 compression Strength ratio of the paste reducing agent
| Example 1 | Example 2 | Example 3 | |
| 3 days compressive Strength ratio% | 135 | 142 | 155 |
| 28 days compressive Strength ratio% | 117 | 130 | 141 |
From the above table, the compressive strength of the concrete at the early stage and the later stage is greatly improved by the gel reducer provided by the invention, wherein the compressive strength of the concrete at the early stage is higher than that of the concrete at the later stage, and the treated lignin has a better compressive strength ratio than untreated lignin.
Test example 2
Concrete slump test
The concrete prepared according to examples 1 to 5 was subjected to slump test according to GB/T50080-2016.
The test results are shown in table 2.
TABLE 2 concrete slump test
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Initial slump/mm | 190 | 200 | 220 | 170 | 185 |
The above table shows that the glue reducing agent provided by the invention has good workability under the matching of a proper water reducing agent. Particularly, the lignin of the glue reducing agent is treated by the moringa peroxidase, so that the workability of the whole glue reducing agent can be effectively improved.
Claims (8)
1. The concrete with good workability is characterized by comprising a gel reducing agent;
the gel reducing agent is prepared from 10-20 parts of alcohol amine compounds, 0.5-2 parts of quaternary ammonium salt surfactants, 2-10 parts of lignin or derivatives thereof, 2-10 parts of tannic acid and 20-30 parts of water in parts by weight.
2. The concrete with good workability according to claim 1, characterized by further comprising a water reducing agent.
3. The concrete with good workability according to claim 2, characterized in that the water reducing agent is a naphthalene water reducing agent.
4. The concrete with good workability according to claim 1, wherein the preparation method of the lignin derivative comprises the following steps:
s1, dissolving 2-5 parts by weight of lignin in 8-10 parts of 20-30 wt% sodium hydroxide aqueous solution, heating to 60-80 ℃, adding 0.5-1 part of 20-40 wt% formaldehyde aqueous solution, stirring for 1-3 hours, heating to 80-100 ℃, adding 0.5-2 parts of sodium sulfite, stirring for 1-3 hours, adjusting the pH value to 6-7 by using 1-2mol/L sulfuric acid, and freeze-drying to obtain sulfonated lignin;
s2, preparing sulfonated lignin into 10-20g/L aqueous solution, adding horseradish peroxidase to enable the concentration of the horseradish peroxidase in the water to be 2-3g/L, adding hydrogen peroxide with the mass fraction of 22-30% and the total volume of 2-3%, stirring for 1-3 hours at 25-30 ℃, heating for 5-10 minutes at 90-100 ℃, adjusting the pH value to 1-2 by using 1-2mol/L sulfuric acid, filtering, and freeze-drying to obtain the sulfonated lignin.
5. The concrete with good workability according to claim 1, characterized in that the preparation method of the gel reducer comprises the following steps;
grinding lignin or its derivatives into powder, sieving, dispersing in water, adding tannic acid, adjusting pH to 10-11 with sodium hydroxide solid, heating to 60-80 deg.C, holding for 5-10 hr, adding alcohol amine compound and quaternary ammonium salt surfactant, naturally cooling to room temperature, and adjusting pH to 6-7 with 0.5-2mol/L sulfuric acid.
6. The concrete with good workability as recited in claim 1, characterized by comprising, by weight, 150-180 parts of cement, 80-100 parts of fly ash, 800-850 parts of sand, 1000-1100 parts of stone, 150-200 parts of water, 3-10 parts of water reducer and 1-3 parts of gel reducer.
7. The concrete with good workability as recited in claim 1, characterized by comprising, by weight, 150-180 parts of cement, 80-100 parts of fly ash, 800-850 parts of sand, 1000-1100 parts of gravel, 150-200 parts of water, 3-6 parts of water reducer and 1.5-2 parts of gel reducer.
8. The method for preparing concrete having good workability according to any one of claims 6 to 7, characterized by comprising the steps of:
mixing cement, fly ash, sand, pebbles, a water reducing agent and a glue reducing agent, adding water, and stirring for 30-60 minutes.
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| CN112358228A (en) * | 2020-11-23 | 2021-02-12 | 北京富瑞勒斯科技开发有限公司 | Concrete glue reducing agent and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112358228A (en) * | 2020-11-23 | 2021-02-12 | 北京富瑞勒斯科技开发有限公司 | Concrete glue reducing agent and preparation method thereof |
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