CN114573261A - Double-component modifier modified machine-made sand and preparation method thereof - Google Patents
Double-component modifier modified machine-made sand and preparation method thereof Download PDFInfo
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- CN114573261A CN114573261A CN202210333759.6A CN202210333759A CN114573261A CN 114573261 A CN114573261 A CN 114573261A CN 202210333759 A CN202210333759 A CN 202210333759A CN 114573261 A CN114573261 A CN 114573261A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
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Abstract
The invention belongs to the technical field of building engineering materials, and particularly relates to bi-component modifier modified machine-made sand and a preparation method thereof. The technical key points are that the machine-made sand is modified by adopting a bi-component surface modifier; the double-component surface modifier comprises a silicon-based waterproofing agent and a clay modifier, wherein the mass ratio of the silicon-based waterproofing agent to the clay modifier is (1-3) to (1-3). According to the bi-component modifier modified machine-made sand and the preparation method thereof, the machine-made sand is modified by the silicon-based waterproof agent and the clay modifier, a hydrophobic layer is formed on the surfaces of the machine-made sand and the clay, negative charges on the surface of the clay are reduced, and the absorption of mud powder or mud blocks in the machine-made sand on the water reducer is prevented, so that the technical problem of concrete slump reduction caused by the machine-made sand used in concrete is fundamentally solved.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to double-component modifier modified machine-made sand and a preparation method thereof.
Background
With the increasing demand of river sand for construction year by year and the restriction of river sand exploitation, the problems of difficult supply, rising price and the like of natural sandstone appear. It is necessary to use machine-made sand instead of river sand in concrete engineering. However, the machine-made sands prepared in the prior art tend to contain a large amount of silt/clods. The mud powder or the mud blocks mainly comprise various clay mineral phases, are mostly of a layered structure, can easily adsorb a large amount of water reducing agent, so that branched chains of the water reducing agent are inserted into the clay layered structure, the dispersing capacity of the water reducing agent on cement particles is greatly weakened, the cement particles are coagulated, the water reducing rate of the water reducing agent is reduced, and the problems of poor slump retaining effect of concrete and the like are caused.
Measures such as increasing the using amount of a water reducing agent or washing sand and stones are usually adopted in engineering to weaken the negative effects brought by clay, but the method cannot fundamentally solve the problems, also can damage the aggregate structure and cannot achieve the technical effect of improving the slump loss resistance of concrete.
In view of the defects of the existing machine-made sand concrete, the inventor develops a two-component modifier modified machine-made sand and a preparation method thereof based on years of abundant experience and professional knowledge of the materials, and by matching theoretical analysis and research innovation, the two-component modifier modified machine-made sand is used for preparing the machine-made sand concrete and controlling the influence of clay on the concrete performance.
Disclosure of Invention
The invention aims to provide bi-component modifier modified machine-made sand, which is modified by a silicon-based waterproof agent and a clay modifier, forms a hydrophobic layer on the surfaces of the machine-made sand and the clay, reduces negative charges on the surface of the clay, prevents mud powder or mud blocks in the machine-made sand from adsorbing a water reducing agent, and fundamentally solves the technical problem that the slump retaining effect of concrete is reduced when the machine-made sand is used in concrete.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides bi-component modifier modified machine-made sand, which adopts bi-component surface modifier to modify the machine-made sand; the bi-component surface modifier comprises a silicon-based waterproofing agent and a clay modifier, wherein the mass ratio of the silicon-based waterproofing agent to the clay modifier is (1-3) to (1-3).
Further, the silicon-based waterproof agent consists of sodium methyl silanol and sodium fluorosilicate, wherein the mass ratio of the sodium methyl silanol to the sodium fluorosilicate is (1-3): (1-3).
In the invention, the sodium methylsiliconate and sodium fluorosiliconate have smaller molecular weight, are water-soluble polymers, are easy to be decomposed by weak acid to form a water-insoluble methyl silicagel waterproof membrane with waterproof performance, form a hydrophobic layer on the surfaces of machine-made sand and clay, have stronger hydrophobic performance and weaken the adsorption effect of the machine-made sand on the water reducing agent.
Further, the clay stabilizer is a cationic clay anti-swelling agent, and is an inorganic/organic polycationic polymer. The clay stabilizer adopted in the invention is a cationic clay anti-swelling agent, and an inorganic/organic polycation polymer is mostly adopted, and the anti-swelling agent has or can dissociate out high cations, can neutralize and reduce negative charges on the surface of the clay, is firmly adsorbed on the surface of the clay to occupy active sites thereof, can effectively prevent the clay from adsorbing a water reducing agent, especially a polycarboxylic acid water reducing agent, and effectively inhibits hydration and swelling of the clay, so that the dispersing effect of the polycarboxylic acid water reducing agent is fully exerted. And the steric hindrance effect and the rheological property of the cement paste can be increased, so that the viscosity of the concrete paste is reduced, the wrapping property of the concrete paste to the aggregate is improved, and the construction performance of the concrete is improved.
Further, the clay stabilizer is polydiallyldimethylammonium chloride, alkyl dimethylallylammonium chloride or cationic polyacrylamide.
Furthermore, the mud content of the machine-made sand is 10-20%, and the water absorption rate is 2-4%.
The second purpose of the invention is to provide a preparation method of the bi-component modifier modified machine-made sand, which has the same function.
The preparation method of the bi-component modifier modified machine-made sand provided by the invention comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand and uniformly stirring;
and S4, drying the machine-made sand obtained in the step S3.
Further, in step S3, the two-component modifier mixed solution is added to the machine-made sand in batches. Due to the fact that the double-component modifier enables the machine-made sand to have hydrophobicity, after the double-component modifier is added, the machine-made sand is prone to caking and uneven in stirring, the clay modifier cannot be in full contact with mud powder or mud blocks contained in the machine-made sand, and the technical effect is affected. Therefore, the dual-component modifier needs to be added in batches, so that the machine-made sand is prevented from caking and is uniformly mixed with the dual-component modifier.
Further, in step S3, the adding manner of the two-component surface modifier mixed solution is calculated according to the following calculation model:
An＝A1·(1-m2)n-1；
wherein An is the amount of the mixed solution of the two-component surface modifier added for the nth time, and the unit is g;
a is the total amount of mixed solution added with the bi-component surface modifier, and the unit is g;
A1is the amount of the mixed solution of the two-component surface modifier added for the first time, and the unit is g;
n is the nth time of adding the mixed solution of the two-component surface modifier;
p is the total times of adding the mixed solution of the bi-component surface modifier, and p is more than or equal to n;
and m is the mud content of the machine-made sand, and the unit is 1.
According to the invention, under the condition that the total adding times and the total adding amount are determined, the amount of the first-time added two-component modifier can be calculated according to the difference of mud-containing rate through the calculation model, and then the amount of the first-time added two-component modifier can be calculated through a calculation mode of an equal ratio series. And the common ratio in the geometric progression is determined by the mud content of the machine-made sand, and the higher the mud content of the machine-made sand is, the smaller the common ratio in the geometric progression is, the smaller the difference between the addition amounts of two adjacent times is.
When the total adding amount and the total adding times of the bi-component modifier are fixed, the higher the mud content of the machine-made sand is, the smaller the amount of the bi-component modifier added for the first time is, and the machine-made sand is prevented from caking or uneven contact among mud powder, mud powder and the bi-component modifier is avoided.
Further, in step S3, the adding manner of the two-component surface modifier mixed solution is calculated according to the following calculation model:
An＝A1·(1-m2+c)n-1；
where c is the water absorption of the machine-made sand in 1.
The higher the water absorption of the machine-made sand, the more easily the machine-made sand is combined with the two-component modifier, and therefore the higher the water absorption of the machine-made sand, the larger the amount of the two-component modifier mixed solution added to the machine-made sand at a time, and therefore, in the present invention, the water absorption is used to further modify the metric ratio.
Further, in step S2, the silicon-based waterproofing agent and the clay stabilizer are mixed, and then diluted with water to 15 to 25 times of the mass of the silicon-based waterproofing agent and the clay stabilizer to obtain a two-component modifier mixed solution.
Further, the drying temperature is 40-60 ℃.
In conclusion, the invention has the following beneficial effects:
according to the bi-component modifier modified machine-made sand and the preparation method thereof, the machine-made sand is modified by the silicon-based waterproof agent and the clay modifier, a hydrophobic layer is formed on the surfaces of the machine-made sand and the clay, negative charges on the surface of the clay are reduced, and the absorption of mud powder or mud blocks in the machine-made sand on the water reducer is prevented, so that the technical problem that the slump retaining effect of concrete is reduced when the machine-made sand is used in concrete is fundamentally solved.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the embodiments, features and effects of the two-component modifier modified machine-made sand and the preparation method thereof according to the present invention are described in detail below.
The material sources used in this embodiment are as follows:
and (3) sand making by machine: changjiu New materials, Inc. of Anhui, China in mid-electric construction;
sodium methylsilanolate: jiangsu Runfeng synthetic science and technology company;
sodium fluosilicate: zhengzhou city Yuanguze chemical Co., Ltd;
cement: henan Meng electric group Cement Co., Ltd;
fly ash: hebeihuihao environmental protection science and technology Limited;
stone: changjiu New materials, Inc. of Anhui, China in mid-electric construction;
water reducing agent: jiangsu botte new materials, Inc.;
poly (diallyldimethylammonium chloride): nanjing Grignard chemical Co., Ltd.
Example 1: bi-component modifier modified machine-made sand and preparation method thereof
The bi-component modifier modified machine-made sand provided by the embodiment, wherein the total mass of the silicon-based waterproofing agent and the clay stabilizer is 1.5g, and specifically comprises: 0.5g of sodium methyl silanol, 0.5g of sodium fluorosilicate and 0.5g of poly diallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1 kg.
Wherein, the mud content of the machine-made sand is 12 percent, and the water absorption is 2.4 percent.
The preparation method comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute the mixture to 30g to obtain a double-component modifier mixed solution;
s3, adding the bi-component modifier mixed solution into the machine-made sand and stirring uniformly;
s4, drying the machine-made sand obtained in the step S3 at 50 ℃.
Example 2: bi-component modifier modified machine-made sand and preparation method thereof
The two-component modifier modified machine-made sand that this embodiment provided, wherein silica-based waterproofing agent and clay stabilizer gross mass are 2g, specifically include: 0.75g of sodium methyl silanol, 0.25g of sodium fluorosilicate and 1g of poly (diallyldimethylammonium chloride); the mass of the machine-made sand is 1 kg.
Wherein, the mud content of the machine-made sand is 15 percent, and the water absorption is 2.8 percent.
The preparation method comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to 35g to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand in batches and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3 at 50 ℃.
Example 3: bi-component modifier modified machine-made sand and preparation method thereof
The bi-component modifier modified machine-made sand that this embodiment provided, wherein silica-based waterproofing agent and clay stabilizer gross mass are 2.5g, specifically include: 0.25g of sodium methyl silanol, 0.75g of sodium fluorosilicate and 1.5g of poly (diallyldimethylammonium chloride); the mass of the machine-made sand is 1 kg.
Wherein, the mud content of the machine-made sand is 20 percent, and the water absorption is 3 percent.
The preparation method comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to 40g to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand in batches and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3 at 50 ℃.
Example 4: bi-component modifier modified machine-made sand and preparation method thereof
The bi-component modifier modified machine-made sand provided by the embodiment, wherein the total mass of the silicon-based waterproofing agent and the clay stabilizer is 1.5g, and specifically comprises: 0.75g of sodium methyl silanol, 0.75g of sodium fluorosilicate and 0.5g of poly (diallyldimethylammonium chloride); the mass of the machine-made sand is 1 kg.
Wherein, the mud content of the machine-made sand is 15 percent, and the water absorption is 2.8 percent.
The preparation method comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to 35g to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand in batches and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3 at 50 ℃.
Example 5: bi-component modifier modified machine-made sand and preparation method thereof
The bi-component modifier modified machine-made sand provided by the embodiment, wherein the total mass of the silicon-based waterproofing agent and the clay stabilizer is 1.5g, and specifically comprises: 0.75g of sodium methyl silanol, 0.75g of sodium fluorosilicate and 0.5g of poly diallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1 kg.
Wherein, the mud content of the machine-made sand is 15 percent, and the water absorption is 2.8 percent.
The preparation method comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to 35g to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand in batches and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3 at 50 ℃.
In step S3, the addition mode of the two-component surface modifier mixed solution is calculated according to the following calculation model:
An＝A1·(1-m2)n-1；
wherein An is the amount of the mixed solution of the two-component surface modifier added for the nth time, and the unit is g;
a is the total amount of the mixed solution added with the bi-component surface modifier, and the unit is g;
A1is the amount of the mixed solution of the two-component surface modifier added for the first time, and the unit is g;
n is the nth time of adding the mixed solution of the two-component surface modifier;
p is the total times of adding the mixed solution of the bi-component surface modifier, and p is more than or equal to n;
and m is the mud content of the machine-made sand, and the unit is 1.
Example 6: bi-component modifier modified machine-made sand and preparation method thereof
The bi-component modifier modified machine-made sand provided by the embodiment, wherein the total mass of the silicon-based waterproofing agent and the clay stabilizer is 1.5g, and specifically comprises: 0.75g of sodium methyl silanol, 0.75g of sodium fluorosilicate and 0.5g of poly (diallyldimethylammonium chloride); the mass of the machine-made sand is 1 kg.
Wherein, the mud content of the machine-made sand is 15 percent, and the water absorption is 2.8 percent.
The preparation method comprises the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to 35g to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand in batches and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3 at 50 ℃.
In step S3, the addition mode of the two-component surface modifier mixed solution is calculated according to the following calculation model:
An＝A1·(1-m2)n-1；
wherein An is the amount of the mixed solution of the two-component surface modifier added for the nth time, and the unit is g;
a is the total amount of the mixed solution added with the bi-component surface modifier, and the unit is g;
A1is the amount of the first addition of the mixed solution of the two-component surface modifier, the unit is g;
n is the nth time of adding the mixed solution of the two-component surface modifier;
p is the total times of adding the mixed solution of the bi-component surface modifier, and p is more than or equal to n;
and m is the mud content of the machine-made sand, and the unit is 1.
In step S3, the addition mode of the two-component surface modifier mixed solution is calculated according to the following calculation model:
An＝A1·(1-m2+c)n-1；
wherein An is the amount of the mixed solution of the two-component surface modifier added at the nth time, and the unit is g;
a is the total amount of the mixed solution added with the bi-component surface modifier, and the unit is g;
A1is the amount of the first addition of the mixed solution of the two-component surface modifier, the unit is g;
n is the nth time of adding the mixed solution of the two-component surface modifier;
p is the total times of adding the mixed solution of the bi-component surface modifier, and p is more than or equal to n;
m is the mud content of the machine-made sand, and the unit is 1;
where c is the water absorption of the machine-made sand in 1.
Comparative example: the machine-made sand without any treatment has a mud content of 12% and a water absorption of 2.4%.
The machine-made sands in examples 1-6 and the comparative example were subjected to a concrete verification test, the mix ratio of the concrete is shown in table 1, and the test results are shown in table 2.
TABLE 1C 30 concrete mixing ratio (kg/m)3)
The test method comprises the following steps:
the concrete slump is tested according to the slump test GB/T50080-2016 of general concrete mixture Performance test method Standard.
The concrete compressive strength is tested according to GB/T50081-2019 standard of concrete physical and mechanical property test method, the test block size is 150mm multiplied by 150mm, and the test age is 7d and 28 d.
The initial setting time of the concrete is tested according to the setting time test of GB/T50080-2016 standard test method for the performance of common concrete mixtures.
The drying time of the concrete 28d is tested according to the standard of test methods for long-term performance and durability of common concrete GB/T50082-2009 shrinkage test (contact method), and the test age is 28 d.
TABLE 2C 30 concrete test results (kg/m)3)
According to comparison between the comparative example 1 and the example 1, the machine-made sand modified by the two-component modifier provided by the invention can greatly improve the slump retention of concrete after being doped into the concrete.
According to the comparison between the embodiment 5 and the embodiment 4, the addition mode of the two-component modifier provided by the invention can ensure that the machine-made sand is modified more uniformly, the slump retaining performance is better and the shrinkage is smaller.
From the comparison between example 6 and example 5, it is found that the slump retaining property and compressive strength of the concrete are higher by further modifying the addition mode of the two-component modifier by adding the water absorption of the machine-made sand as an influence factor.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A bi-component modifier modified machine-made sand is characterized in that a bi-component surface modifier is adopted to modify the machine-made sand; the double-component surface modifier comprises a silicon-based waterproofing agent and a clay modifier, wherein the mass ratio of the silicon-based waterproofing agent to the clay modifier is (1-3) to (1-3).
2. The bi-component modifier modified machine-made sand according to claim 1, wherein the silicon-based waterproof agent consists of sodium methyl silanol and sodium fluorosilicate, and the mass ratio of the sodium methyl silanol to the sodium fluorosilicate is (1-3): (1-3).
3. The two-component modifier-modified manufactured sand of claim 1 or 2, wherein the clay stabilizer is a cationic clay anti-swelling agent which is an inorganic/organic polycationic polymer.
4. The two-component modifier modified machine-made sand of claim 1, wherein the machine-made sand has a mud content of 10-20% and a water absorption of 2-4%.
5. The preparation method of the bi-component modifier modified machine-made sand is characterized by comprising the following operation steps:
s1, placing the machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water to dilute to obtain a double-component modifier mixed solution;
s3, adding the double-component modifier mixed solution into the machine-made sand and uniformly stirring;
and S4, drying the machine-made sand obtained in the step S3.
6. The method of claim 5, wherein the two-component modifier mixed solution is added to the machine-made sand in batches in step S3.
7. The method as claimed in claim 6, wherein the two-component surface modifier mixed solution is added in a manner calculated according to the following calculation model in step S3:
wherein An is the amount of the mixed solution of the two-component surface modifier added for the nth time, and the unit is g;
a is the total amount of the mixed solution added with the bi-component surface modifier, and the unit is g;
A1is the amount of the first addition of the mixed solution of the two-component surface modifier, the unit is g;
n is the nth time of adding the mixed solution of the two-component surface modifier;
p is the total times of adding the mixed solution of the bi-component surface modifier, and p is more than or equal to n;
and m is the mud content of the machine-made sand, and the unit is 1.
8. The method as claimed in claim 7, wherein the two-component surface modifier mixed solution is added in a manner calculated according to the following calculation model in step S3:
where c is the water absorption of the machine-made sand in 1.
9. The method for preparing the dual-component modifier modified machine-made sand as claimed in claim 5, wherein in the step S2, the silicon-based waterproof agent and the clay stabilizer are mixed, and then water is added to dilute the mixture to 15-25 times of the mass of the silicon-based waterproof agent and the clay stabilizer, so as to obtain the dual-component modifier mixed solution.
10. The preparation method of the bi-component modifier modified machine-made sand of claim 5, wherein the drying temperature is 40-60 ℃.
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| CN116535121A (en) * | 2023-03-30 | 2023-08-04 | 浙江交工金筑交通建设有限公司 | Ore production improver for dry method sand |
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| WO2012054403A1 (en) * | 2010-10-19 | 2012-04-26 | W. R. Grace & Co.-Conn. | Clay-bearing manufactured sands for hydratable cementitious compositions |
| RU2469005C1 (en) * | 2011-07-04 | 2012-12-10 | Общество с ограниченной ответственностью "ВИС Девелопмент" | Method of producing hydrophobic loose material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116535121A (en) * | 2023-03-30 | 2023-08-04 | 浙江交工金筑交通建设有限公司 | Ore production improver for dry method sand |
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