CN114573261B - 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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- CN114573261B CN114573261B CN202210333759.6A CN202210333759A CN114573261B CN 114573261 B CN114573261 B CN 114573261B CN 202210333759 A CN202210333759 A CN 202210333759A CN 114573261 B CN114573261 B CN 114573261B
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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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Abstract
The invention belongs to the technical field of building engineering materials, and particularly relates to a double-component modifier modified machine-made sand and a preparation method thereof. The technical points are that a bi-component surface modifier is adopted to modify the machine-made sand; the bi-component surface modifier comprises a silicon-based waterproof agent and a clay modifier, wherein the mass ratio of the silicon-based waterproof agent to the clay modifier is (1-3). According to the dual-component modifier modified machine-made sand and the preparation method thereof, the machine-made sand is modified through the silicon-based waterproof agent and the clay modifier, the hydrophobic layer is formed on the surfaces of the machine-made sand and the clay, meanwhile, negative charges on the surfaces of the clay are reduced, the adsorption of mud powder or mud blocks in the machine-made sand to the water reducer is prevented, and the technical problem that the slump of concrete is reduced when the machine-made sand is used in the concrete is fundamentally solved.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a double-component modifier modified machine-made sand and a preparation method thereof.
Background
With the annual increase of the demand of river sand for construction and the limitation of river sand exploitation, the problems of difficult supply, rising price and the like of natural sand and stone occur. The adoption of machine-made sand to replace river sand for concrete engineering becomes necessary. However, the machine-made sand prepared by the prior art is easy to contain a large amount of mud powder/mud blocks. The mud powder or the mud block mainly comprises a plurality of clay mineral phases, is of a layered structure, is easy to adsorb a large amount of water reducer, enables branched chains of the water reducer to be inserted into the clay layered structure, greatly weakens the dispersion capacity of the water reducer on cement particles, causes the cement particles to be aggregated, reduces the water reducing rate of the water reducer, and causes the problems of poor slump retaining effect of concrete and the like.
In the engineering, the negative influence caused by clay is weakened by increasing the consumption of a water reducer or washing sand stone and the like, but the method cannot fundamentally solve the problem, and the aggregate structure is damaged, so that the technical effect of improving the slump loss resistance of the concrete cannot be achieved.
In view of the defects of the existing machine-made sand concrete, the inventor based on years of rich experience and professional knowledge of the materials and the cooperation of theoretical analysis, researches and innovations, develops a two-component modifier modified machine-made sand and a preparation method thereof, and is used for preparing the machine-made sand concrete and controlling the influence of clay on the performance of the concrete.
Disclosure of Invention
The first object of the invention is to provide a dual-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 surfaces of the clay, prevents mud powder or mud blocks in the machine-made sand from adsorbing a water reducer, and fundamentally solves the technical problems that the machine-made sand is used in concrete and the slump retaining effect of the concrete is reduced.
The technical aim of the invention is realized by the following technical scheme:
the machine-made sand is modified by the two-component modifier, and the machine-made sand is modified by the two-component surface modifier; wherein the bi-component surface modifier comprises a silicon-based waterproof agent and a clay modifier, and the mass ratio of the silicon-based waterproof agent to the clay modifier is (1-3) to (1-3).
Further, the silicon-based waterproof agent consists of sodium methyl siliconate and sodium fluorosilicate, wherein the mass ratio of the sodium methyl siliconate to the sodium fluorosilicate is (1-3): (1-3).
In the invention, the methyl sodium silicate and the fluorosilicone sodium silicate have smaller molecular weight, are water-soluble polymers, are easily decomposed by weak acid, form insoluble methyl silica gel waterproof films with waterproof performance, form hydrophobic layers 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 reducer.
Further, the clay stabilizer is a cationic clay anti-swelling agent, and is an inorganic/organic polycation polymer. The clay stabilizer adopted in the invention is a cationic clay anti-swelling agent, and most of the clay stabilizer adopts inorganic/organic polycation polymers, so that the anti-swelling agent has or can dissociate very high cations, can neutralize or reduce negative charges on the surface of clay, is firmly adsorbed on the surface of clay to occupy active sites of the clay, can effectively prevent the adsorption of clay on water reducer, especially polycarboxylate water reducer, effectively inhibit hydration and swelling of clay, and fully exert the dispersing effect of the polycarboxylate water reducer. And the steric hindrance effect and rheological property of the cement paste can be increased, so that the viscosity of the concrete paste is reduced, and the coating property of the concrete paste on aggregate is improved, and the construction performance of the concrete is further improved.
Further, the clay stabilizer is polydiallyl dimethyl ammonium chloride, alkyl dimethyl allyl ammonium chloride or cationic polyacrylamide.
Further, the mud content of the machine-made sand is 10-20%, and the water absorption is 2-4%.
The second object of the invention is to provide a preparation method of the two-component modifier modified machine-made sand, which has the same effect.
The preparation method of the dual-component modifier modified machine-made sand provided by the invention comprises the following operation steps:
s1, placing machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water for dilution to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier into 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. Because the double-component modifier can make the machine-made sand have hydrophobicity, after the double-component modifier is added, the machine-made sand is easy to agglomerate and is unevenly stirred, so that the clay modifier cannot fully contact with mud powder or mud blocks contained in the machine-made sand, and the technical effect is affected. Therefore, the bi-component modifier is required to be added in batches, so that the machine-made sand is ensured not to be agglomerated and is uniformly mixed with the bi-component modifier.
Further, in step S3, the manner of adding the mixed solution of the two-component surface modifier is calculated according to the following calculation model:
A n ＝A 1 ·(1-m 2 ) 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 two-component surface modifier, and the unit is g;
A 1 the unit is g, which is the amount of the mixed solution of the two-component surface modifier added for the first time;
n is the nth time of adding the two-component surface modifier mixed solution;
p is the total number of times of adding the mixed solution of the two-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.
According to the invention, through the calculation model, under the condition that the total adding times and the total adding amount are determined, the amount of the bi-component modifier added for the first time can be calculated according to the difference of mud content, and then the amount of the bi-component modifier added for each time can be calculated through an equal ratio series calculation mode. The public ratio in the equal ratio series 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 public ratio in the equal ratio series is, the smaller the difference between the addition amounts of two adjacent times is.
When the total addition amount and the total addition times of the two-component modifier are fixed, the higher the mud content of the machine-made sand, the smaller the amount of the two-component modifier added for the first time, and the caking of the machine-made sand or uneven contact between mud powder, mud powder and the two-component modifier is avoided.
Further, in step S3, the manner of adding the mixed solution of the two-component surface modifier is calculated according to the following calculation model:
A n ＝A 1 ·(1-m 2 +c) n-1 ；
where c is the water absorption of the machine-made sand and the unit is 1.
When the water absorption rate of the machine-made sand is higher, the machine-made sand is easier to combine with the bi-component modifier, so that the higher the water absorption rate of the machine-made sand is, the larger the amount of the bi-component modifier mixed solution added into the machine-made sand is, and therefore, in the invention, the water absorption rate is adopted to further modify the public ratio.
In step S2, the silicon-based waterproof agent and the clay stabilizer are mixed, and then water is added to dilute the mixture until the mass of the silicon-based waterproof agent and the clay stabilizer is 15-25 times, so that a bi-component modifier mixed solution is obtained.
Further, the drying temperature is 40-60 ℃.
In summary, the invention has the following beneficial effects:
according to the dual-component modifier modified machine-made sand and the preparation method thereof, the machine-made sand is modified through the silicon-based waterproof agent and the clay modifier, the hydrophobic layer is formed on the surfaces of the machine-made sand and the clay, meanwhile, negative charges on the surfaces of the clay are reduced, the adsorption of mud powder or mud blocks in the machine-made sand to the water reducer is prevented, and the technical problem that the machine-made sand is used in concrete and the slump retaining effect of the concrete is reduced is fundamentally solved.
Detailed Description
In order to further illustrate the technical means and effects adopted by the invention to achieve the preset aim, the invention provides the two-component modifier modified machine-made sand and the preparation method thereof, and the specific implementation mode, the characteristics and the effects thereof are described in detail below.
The sources of materials used in this embodiment are as follows:
machine-made sand: middle electric construction Anhui Changjiu New Material stock Co., ltd;
sodium methyl siliconate: jiangsu Runfeng synthetic technology Co., ltd;
sodium fluosilicate: zhengzhou city source zeer chemical Co., ltd;
and (3) cement: henan Meng electric group Cement Co., ltd;
fly ash: hebei Haohao environmental protection technology Co., ltd;
stone: middle electric construction Anhui Changjiu New Material stock Co., ltd;
water reducing agent: jiangsu Bote New Material stock Co., ltd;
polydiallyl dimethyl ammonium chloride: nanjing Geling chemical Co.
Example 1: bi-component modifier modified machine-made sand and preparation method thereof
The dual-component modifier modified machine-made sand provided in the embodiment, wherein the total mass of the silicon-based waterproof agent and the clay stabilizer is 1.5g, specifically comprises: 0.5g of sodium methyl siliconate, 0.5g of sodium fluorosilicate and 0.5g of polydiallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1kg.
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 machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and then adding water to dilute to 30g to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier into machine-made sand, and uniformly stirring;
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 dual-component modifier modified machine-made sand provided in the embodiment, wherein the total mass of the silicon-based waterproof agent and the clay stabilizer is 2g, specifically comprises: 0.75g of sodium methyl siliconate, 0.25g of sodium fluorosilicate and 1g of polydiallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1kg.
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 machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and then adding water to dilute to 35g to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier 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 dual-component modifier modified machine-made sand provided in the embodiment, wherein the total mass of the silicon-based waterproof agent and the clay stabilizer is 2.5g, specifically comprises: 0.25g of sodium methyl siliconate, 0.75g of sodium fluorosilicate and 1.5g of polydiallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1kg.
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 machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and then adding water to dilute to 40g to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier 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 dual-component modifier modified machine-made sand provided in the embodiment, wherein the total mass of the silicon-based waterproof agent and the clay stabilizer is 1.5g, specifically comprises: 0.75g of sodium methyl siliconate, 0.75g of sodium fluorosilicate and 0.5g of polydiallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1kg.
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 machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and then adding water to dilute to 35g to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier 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 dual-component modifier modified machine-made sand provided in the embodiment, wherein the total mass of the silicon-based waterproof agent and the clay stabilizer is 1.5g, specifically comprises: 0.75g of sodium methyl siliconate, 0.75g of sodium fluorosilicate and 0.5g of polydiallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1kg.
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 machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and then adding water to dilute to 35g to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier 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 mixed solution of the two-component surface modifier is calculated according to the following calculation model:
A n ＝A 1 ·(1-m 2 ) 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 two-component surface modifier, and the unit is g;
A 1 the unit is g, which is the amount of the mixed solution of the two-component surface modifier added for the first time;
n is the nth time of adding the two-component surface modifier mixed solution;
p is the total number of times of adding the mixed solution of the two-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.
Example 6: bi-component modifier modified machine-made sand and preparation method thereof
The dual-component modifier modified machine-made sand provided in the embodiment, wherein the total mass of the silicon-based waterproof agent and the clay stabilizer is 1.5g, specifically comprises: 0.75g of sodium methyl siliconate, 0.75g of sodium fluorosilicate and 0.5g of polydiallyl dimethyl ammonium chloride; the mass of the machine-made sand is 1kg.
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 machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and then adding water to dilute to 35g to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier 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 mixed solution of the two-component surface modifier is calculated according to the following calculation model:
A n ＝A 1 ·(1-m 2 ) 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 two-component surface modifier, and the unit is g;
A 1 the unit is g, which is the amount of the mixed solution of the two-component surface modifier added for the first time;
n is the nth time of adding the two-component surface modifier mixed solution;
p is the total number of times of adding the mixed solution of the two-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.
In step S3, the addition mode of the mixed solution of the two-component surface modifier is calculated according to the following calculation model:
A n ＝A 1 ·(1-m 2 +c) 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 two-component surface modifier, and the unit is g;
A 1 the unit is g, which is the amount of the mixed solution of the two-component surface modifier added for the first time;
n is the nth time of adding the two-component surface modifier mixed solution;
p is the total number of times of adding the mixed solution of the two-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 and the unit is 1.
Comparative examples: the mud content of the machine-made sand which is not treated is 12 percent, and the water absorption is 2.4 percent.
The machine-made sand in examples 1 to 6 and comparative example was subjected to concrete verification test, the mixing ratio of the concrete is shown in table 1, and the test results are shown in table 2.
TABLE 1C 30 concrete mix (kg/m) 3 )
The test method comprises the following steps:
the slump of the concrete is tested according to the slump test of GB/T50080-2016, standard of the Performance test method of common concrete mixtures.
The compressive strength of the concrete is tested according to the test method standard for physical and mechanical properties of concrete GB/T50081-2019, the test block size is 150mm multiplied by 150mm, and the test age is 7d and 28d.
The initial setting time of the concrete is tested according to the setting time test of GB/T50080-2016 of the standard of the common concrete mixture performance test method.
The drying time of the concrete 28d is tested according to the shrinkage test (contact method) of GB/T50082-2009 Standard of test method for Long-term Performance and durability of common concrete, and the test age is 28d.
TABLE 2 C30 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 comparison of the embodiment 5 and the embodiment 4, the addition mode of the two-component modifier provided by the invention can lead the machine-made sand to be modified more uniformly, and has better slump retaining performance and smaller shrinkage.
As can be seen from comparison of example 6 and example 5, the slump retaining performance and compressive strength of the concrete are higher after the water absorption of the machine-made sand is used as an influencing factor and the adding mode of the two-component modifier is further modified.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. A dual-component modifier modified machine-made sand is characterized in that a dual-component surface modifier is adopted to modify the machine-made sand; the bi-component surface modifier comprises a silicon-based waterproof agent and a clay modifier, wherein the mass ratio of the silicon-based waterproof agent to the clay modifier is (1-3);
the preparation method of the double-component modifier modified machine-made sand is characterized by comprising the following operation steps:
s1, placing machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water for dilution to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier into machine-made sand, and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3;
in the step S3, the mixed solution of the two-component modifier is added into the machine-made sand in batches;
in step S3, the addition mode of the mixed solution of the two-component surface modifier is calculated according to the following calculation model:
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 two-component surface modifier, and the unit is g;
A 1 the unit is g, which is the amount of the mixed solution of the two-component surface modifier added for the first time;
n is the nth time of adding the two-component surface modifier mixed solution;
p is the total number of times of adding the mixed solution of the two-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.
2. The two-component modifier modified machine-made sand according to claim 1, wherein the silicon-based waterproof agent is composed of sodium methyl siliconate and sodium fluorosilicate, and the mass ratio of the sodium methyl siliconate to the sodium fluorosilicate is (1-3): (1-3).
3. A two-component modifier modified machine-made sand according to claim 1 or 2, wherein the clay stabiliser is a cationic clay anti-swelling agent, and is an inorganic/organic polycationic polymer.
4. The two-component modifier modified machine-made sand according to claim 1, wherein the machine-made sand has a mud content of 10-20% and a water absorption of 2-4%.
5. The two-component modifier modified machine-made sand according to claim 1, wherein in the step S2, after the silicon-based waterproof agent and the clay stabilizer are mixed, 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 a two-component modifier mixed solution.
6. The two-component modifier modified machine-made sand of claim 1, wherein the drying temperature is 40-60 ℃.
7. A dual-component modifier modified machine-made sand is characterized in that a dual-component surface modifier is adopted to modify the machine-made sand; the bi-component surface modifier comprises a silicon-based waterproof agent and a clay modifier, wherein the mass ratio of the silicon-based waterproof agent to the clay modifier is (1-3);
the preparation method of the double-component modifier modified machine-made sand is characterized by comprising the following operation steps:
s1, placing machine-made sand into a stirring pot;
s2, mixing the silicon-based waterproof agent and the clay stabilizer, and adding water for dilution to obtain a two-component modifier mixed solution;
s3, adding the mixed solution of the two-component modifier into machine-made sand, and uniformly stirring;
s4, drying the machine-made sand obtained in the step S3;
in the step S3, the mixed solution of the two-component modifier is added into the machine-made sand in batches;
in step S3, the addition mode of the mixed solution of the two-component surface modifier is calculated according to the following calculation model:
where c is the water absorption of the machine-made sand and the unit is 1.
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