CN111019066A - High slump loss resistant water reducing agent and preparation method thereof - Google Patents
High slump loss resistant water reducing agent and preparation method thereof Download PDFInfo
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- CN111019066A CN111019066A CN201911382473.1A CN201911382473A CN111019066A CN 111019066 A CN111019066 A CN 111019066A CN 201911382473 A CN201911382473 A CN 201911382473A CN 111019066 A CN111019066 A CN 111019066A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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Abstract
The invention relates to the technical field of concrete additives, and relates to a preparation method of a high slump loss resistant water reducing agent, which comprises the following steps: s1, mixing deionized water and the composition A; s2, dropwise adding an initiator, a monomer B, a monomer C, a reducing agent and a chain transfer agent, and reacting; s3, adjusting the pH value to 6-8; the weight portions of the components are as follows: 4-8 parts of deionized water; 20-35 parts of a composition A; 3-6 parts of an initiator; 15-20 parts of a monomer B; 13-16 parts of a monomer C; 2-4 parts of a reducing agent; 1-2 parts of a chain transfer agent; the composition A is formed by mixing monomers A, and the molecular structure of the monomers A is as follows:
(ii) a The monomer B is any one of allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether, isoamylol polyoxyethylene ether, vinyl butyl ether polyoxyethylene ether or isobutenol polyoxyethylene ether; the monomer C is any one of hydroxypropyl acrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate and hydroxyethyl methacrylate. The invention has the effect that the water reducing rate of the water reducing agent is not easily influenced.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a high slump loss resistant water reducing agent and a preparation method thereof.
Background
At present, the water reducing agent is a concrete admixture capable of reducing the water consumption for mixing under the condition of maintaining the slump constant of concrete basically. The water reducing agent has a dispersing effect on cement particles after being added into the concrete mixture, can improve the workability of the concrete mixture, reduce the unit water consumption, improve the fluidity of the concrete mixture, or reduce the unit cement consumption, and save the cement.
Most of the existing water reducing agents belong to anionic surfactants, such as lignosulphonates, naphthalene sulfonate formaldehyde polymers and the like. However, the existing water reducing agent is sensitive to soil and stone powder in concrete aggregate, and when the content of the soil or the content of the powder in a concrete system is high, the water reducing rate of the water reducing agent is easily influenced.
The above prior art solutions have the following drawbacks: because the grit resource consumes almost totally gradually, the grit resource in every place appears the condition of shortage and worsening gradually to make the quality of the grit for preparing the concrete uneven, make the mud content or the powder content in the grit higher easily, and then make the water-reducing rate of water-reducing agent receive the influence easily, consequently, still have the space of improvement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a high slump loss resistant water reducing agent.
The second purpose of the invention is to provide a high slump-retaining water reducing agent.
The above object of the present invention is achieved by the following technical solutions:
a preparation method of a high slump loss resistant water reducing agent comprises the following steps:
s1, adding deionized water and the composition A into a reaction vessel according to the mass portion ratio, raising the temperature to 70-85 ℃, and forming a premix after the composition A is completely dissolved;
s2, adding an initiator into the pre-mixture, dropwise adding the monomer B and the monomer C, dropwise adding a mixed solution of a reducing agent and a chain transfer agent, preserving heat, and stirring for reacting for 3-5 hours;
s3, after the reaction is finished, dropwise adding alkali liquor to adjust the pH value to 6-8, and obtaining the high slump loss resistant water reducer;
the weight portions of the components are as follows:
4-8 parts of deionized water;
20-35 parts of a composition A;
3-6 parts of an initiator;
15-20 parts of a monomer B;
13-16 parts of a monomer C;
2-4 parts of a reducing agent;
1-2 parts of a chain transfer agent;
the composition A is formed by mixing one or more monomers A, and the molecular structure of the monomers A is as follows:
the monomer B is any one of allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether, isoamylol polyoxyethylene ether, vinyl butyl ether polyoxyethylene ether or isobutenol polyoxyethylene ether;
the monomer C is any one of hydroxypropyl acrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate and hydroxyethyl methacrylate.
By adopting the technical scheme, the high slump-retaining water reducing agent is formed by reacting the composition A, the monomer B and the monomer C in a specific proportion, so that the anti-adsorption performance of the high slump-retaining water reducing agent is enhanced, the water reducing effect of the high slump-retaining water reducing agent is not easily influenced by the mud content and the powder content in aggregate, and the water reducing rate of the high slump-retaining water reducing agent is improved better; meanwhile, the slow release of the water reducing agent is facilitated to better keep the slump of the concrete, so that the slump retaining effect of the concrete is better, the mortar fluidity of the concrete is further improved, the slump of the concrete is reduced better, and the compressive strength of the concrete is improved better.
The present invention in a preferred example may be further configured to: the composition A comprises the following components in parts by mass:
8-13 parts of propylene sulfonic acid;
7-10 parts of methacrylic sulfonic acid;
10-12 parts of vinyl sulfonic acid.
By adopting the technical scheme, the composition A is formed by mutually and cooperatively matching the propylene sulfonic acid, the methacrylic sulfonic acid and the vinyl sulfonic acid, so that the high slump-retaining water reducing agent prepared by reaction has stronger adsorption resistance, the water reducing rate of the high slump-retaining water reducing agent is favorably improved, and the water reducing rate of the high slump-retaining water reducing agent is less susceptible to the influence of the powder content and the mud content of aggregate; meanwhile, the slump loss prevention water reducer is beneficial to slow release of the high slump loss prevention water reducer so as to better keep the slump of concrete, so that the slump loss prevention effect of the concrete is better, the mortar fluidity of the concrete is better improved, and the compressive strength of the concrete is better improved while the slump change of the concrete is smaller.
The present invention in a preferred example may be further configured to: the composition A comprises the following components in parts by mass:
9 parts of propylene sulfonic acid;
10 parts of methacrylic sulfonic acid;
and 11 parts of vinyl sulfonic acid.
By adopting the technical scheme, the specific dosage proportion of each component in the composition A is controlled, so that the adsorption resistance of the high slump retaining water reducer obtained by reaction can be better improved, the water reducing rate of the water reducer can be better improved, and the water reducer is less susceptible to the influence of the mud content and the powder content of aggregate; meanwhile, the slump loss prevention water reducer is beneficial to slow release of the high slump loss prevention water reducer so as to better keep the slump of concrete, so that the slump loss prevention effect of the concrete is better, the mortar fluidity of the concrete is favorably improved, and the compressive strength of the concrete is higher while the slump of the concrete is smaller.
The present invention in a preferred example may be further configured to: the monomer B is isobutylene alcohol polyoxyethylene ether.
By adopting the technical scheme, the isobutylene polyoxyethylene ether is adopted as the monomer B for reaction, so that the water reducing effect and the slump retaining effect of the prepared high slump retaining water reducing agent are favorably and better improved, the water reducing rate of the high slump retaining water reducing agent is favorably improved, the slump of concrete is more difficult to be influenced, the mortar fluidity of the concrete is favorably improved, and the slump of the concrete is smaller; in addition, the compressive strength of the concrete is favorably improved.
The present invention in a preferred example may be further configured to: the monomer C is hydroxypropyl methacrylate.
By adopting the technical scheme, the hydroxypropyl methacrylate is adopted as the monomer C for reaction, so that the water reducing effect of the high slump-retaining water reducing agent prepared by reaction is favorably improved, the slump-retaining effect of the high slump-retaining water reducing agent is favorably improved, the water reducing rate of the high slump-retaining water reducing agent is higher, the mortar fluidity is favorably improved, and the slump of concrete is lower; meanwhile, the concrete is favorable for better enhancing the compressive strength of the concrete.
The present invention in a preferred example may be further configured to: the initiator is dimethyl azodiisobutyrate.
By adopting the technical scheme, the reaction is favorably promoted better by adopting the dimethyl azodiisobutyrate as the initiator, so that reactants are favorably and completely converted into reaction products, the yield is improved, the purity of the products is favorably improved, the water reducing effect and slump retaining effect of the high slump retaining water reducing agent are favorably improved, the water reducing rate of the high slump retaining water reducing agent is higher, the slump of concrete is favorably reduced, and the mortar fluidity of the concrete is higher; in addition, the compressive strength of the concrete is favorably improved.
The present invention in a preferred example may be further configured to: the reducing agent is thiourea dioxide.
Through adopting above-mentioned technical scheme, through adopting thiourea dioxide as the reductant, be favorable to promoting going on of reaction better for the high slump retaining type water-reducing agent's that the reaction preparation gained subtract water effect and slump retaining effect better, thereby be favorable to reducing the slump of concrete better when being favorable to improving high slump retaining type water-reducing agent's the water reducing rate better, be favorable to improving the compressive strength of concrete better when making the mortar mobility of concrete higher.
The present invention in a preferred example may be further configured to: the chain transfer agent is n-dodecyl mercaptan.
By adopting the technical scheme, the n-dodecyl mercaptan is taken as the chain transfer agent, the reaction is favorably promoted to be better carried out, the reactants are favorably and completely converted into products, the reaction conversion rate is favorably improved, the purity of the reaction products is favorably improved, the slump retaining effect and the water reducing effect of the prepared high slump retaining water reducing agent are better, the slump of the concrete is favorably reduced while the water reducing rate of the high slump retaining water reducing agent is favorably improved, the mortar fluidity of the concrete is higher, and the compressive strength of the concrete is favorably improved.
The present invention in a preferred example may be further configured to: the alkali solution used for adjusting the pH in the step S5 is a sodium hydroxide solution.
Through adopting above-mentioned technical scheme, through adopting sodium hydroxide solution as alkali lye in order to adjust the pH value, make the alkali lye of adding be difficult to more influence the performance of high slump retaining type water reducing agent when being favorable to improving the regulation degree of accuracy of pH value better, thereby make the water reducing rate of high slump retaining type water reducing agent be difficult to receive the influence of mud content and powder content in the aggregate more, be favorable to improving the water reducing rate of high slump retaining type water reducing agent better, and then be favorable to improving the mobility of mortar better, make the compressive strength of concrete higher when the slump of concrete is littleer.
The second aim of the invention is realized by the following technical scheme:
a high slump loss resistant water reducing agent is prepared by the preparation method of the high slump loss resistant water reducing agent.
By adopting the technical scheme, the high slump-retaining water reducing agent is prepared by adopting the preparation method, so that the prepared high slump-retaining water reducing agent is less susceptible to the influence of the mud content and the powder content of the aggregate, the water reducing rate of the high slump-retaining water reducing agent is favorably improved, and meanwhile, the slow release of the high slump-retaining water reducing agent is favorably realized, the slump-retaining effect of concrete is better, the fluidity of mortar is favorably improved, and the slump of the concrete is smaller; in addition, the compressive strength of the concrete is favorably improved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the high slump-retaining water reducing agent is formed by reacting the composition A, the monomer B and the monomer C in a specific proportion, so that the anti-adsorption performance of the high slump-retaining water reducing agent is enhanced, the water reducing effect of the high slump-retaining water reducing agent is not easily influenced by the mud content and the powder content in aggregate, and the water reducing rate of the high slump-retaining water reducing agent is improved better;
2. the high slump loss resistant water reducing agent is formed by reacting the composition A, the monomer B and the monomer C in a specific proportion, so that the slow release of the water reducing agent is facilitated to better keep the slump of concrete, the mortar fluidity of the concrete is better improved, the slump of the concrete is better reduced, and the compressive strength of the concrete is better improved;
3. by controlling the composition components in the composition A and the specific dosage proportion of the components, the anti-adsorption performance of the high slump-retaining water reducer obtained by reaction can be better improved, the water reducing rate of the water reducer can be better improved, and the water reducer is less susceptible to the influence of the mud content and the powder content of aggregate;
4. by controlling the composition components in the composition A and the specific dosage proportion of the components, the slow release of the high slump loss resistant water reducer is facilitated to better keep the slump of concrete, so that the slump loss resistant effect of the concrete is better, the mortar fluidity of the concrete is favorably improved, and the compressive strength of the concrete is higher while the slump of the concrete is smaller.
Drawings
FIG. 1 is a process flow chart of the preparation method of the high slump loss resistant water reducing agent.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
A preparation method of a high slump loss resistant water reducing agent comprises the following steps:
s1, adding 4kg of deionized water and 35kg of composition A into a four-neck flask with a stirrer and a thermometer, heating in a water bath to 70 ℃, and stirring until the composition A is completely dissolved to form a premix.
S2, keeping the temperature in the four-neck flask at 70 ℃, mixing and stirring uniformly 2kg of reducing agent and 1kg of chain transfer agent to form a mixed solution, adding 4.5kg of initiator into the pre-mixture while stirring, then adopting a constant flow pump to control the flow rate, dropwise adding 15kg of monomer B and 13kg of monomer C in sequence, and dropwise adding a mixed solution formed by uniformly mixing the reducing agent and the chain transfer agent simultaneously, so that the monomer B, the monomer C and the mixed solution are dropwise added in 3 hours, and then continuously stirring and carrying out heat preservation reaction for 5 hours.
And S3, after the reaction is finished, dropwise adding alkali liquor to adjust the pH value to 6, and thus obtaining the high slump loss resistant water reducer.
In this example, composition a is propylene sulfonic acid, the reducing agent is sodium borohydride, the chain transfer agent is 2, 4-diphenyl-4-methyl-1-pentene, the initiator is potassium persulfate, monomer B is allyl polyoxyethylene ether, monomer C is hydroxypropyl acrylate, and the alkali solution is ammonia.
Example 2
The difference from example 1 is that:
the water bath was heated to 78 ℃ in step S1.
In the step S2, the temperature in the four-neck flask is kept constant at 78 ℃, and after the monomer B, the monomer C, the reducing agent and the mixed solution are added, stirring and heat preservation reaction are carried out for 4 hours.
In step S3, the pH is adjusted to 7.
Meanwhile, the amounts of the components used in the reaction are as follows:
8kg of deionized water; 20kg of composition A; 6kg of initiator; 20kg of monomer B; 15kg of monomer C; 4kg of reducing agent; 1.5kg of chain transfer agent.
Example 3
The difference from example 1 is that:
the water bath was heated to 85 ℃ in step S1.
In the step S2, the temperature in the four-neck flask is kept at 85 ℃, the monomer B, the monomer C, the reducing agent and the mixed solution are added, and then the mixture is stirred and kept for reaction for 3 hours.
In step S3, the pH is adjusted to 8.
Meanwhile, the amounts of the components used in the reaction are as follows:
6kg of deionized water; 27.5kg of composition A; 3kg of initiator; 17.5kg of monomer B; 14.5kg of monomer C; 3kg of reducing agent; 2kg of chain transfer agent.
Example 4
The difference from example 1 is that:
the water bath was heated to 80 ℃ in step S1.
In the step S2, the temperature in the four-neck flask is kept at 80 ℃, the monomer B, the monomer C, the reducing agent and the mixed solution are added, and then the mixture is stirred and kept for reaction for 3.5 hours.
In step S3, the pH is adjusted to 7.5.
Meanwhile, the amounts of the components used in the reaction are as follows:
7kg of deionized water; 20kg of composition A; 5kg of initiator; 19kg of monomer B; 14kg of monomer C; 3.5kg of reducing agent; 1.8kg of chain transfer agent.
Example 5
The difference from example 4 is that: composition a is methacrylic sulfonic acid.
Example 6
The difference from example 4 is that: composition a is vinylsulfonic acid.
Example 7
The difference from example 4 is that: composition A was prepared by uniformly mixing 10kg of propylene sulfonic acid with 10kg of methacrylic sulfonic acid.
Example 8
The difference from example 4 is that: composition A was prepared by uniformly mixing 10kg of propylene sulfonic acid with 10kg of vinyl sulfonic acid.
Example 9
The difference from example 4 is that: composition A was prepared by uniformly mixing 10kg of methacrylic sulfonic acid with 10kg of vinyl sulfonic acid.
Example 10
The difference from example 4 is that: composition A was prepared by uniformly mixing 8kg of propylene sulfonic acid, 10kg of methacrylic sulfonic acid and 12kg of vinyl sulfonic acid.
Example 11
The difference from example 4 is that: composition A was prepared by uniformly mixing 13kg of propylene sulfonic acid, 7kg of methacrylic sulfonic acid and 10kg of vinyl sulfonic acid.
Example 12
The difference from example 4 is that: composition A was prepared by uniformly mixing 9kg of propylene sulfonic acid, 10kg of methacrylic sulfonic acid, and 11kg of vinyl sulfonic acid.
Example 13
The difference from example 12 is that: the monomer B is methyl allyl polyoxyethylene ether.
Example 14
The difference from example 12 is that: the monomer B is isopentenol polyoxyethylene ether.
Example 15
The difference from example 12 is that: the monomer B is vinyl butyl ether polyoxyethylene ether.
Example 16
The difference from example 12 is that: the monomer B is isobutylene polyoxyethylene ether.
Example 17
The difference from example 16 is that: the monomer C is hydroxyethyl acrylate.
Example 18
The difference from example 16 is that: the monomer C is hydroxyethyl methacrylate.
Example 19
The difference from example 16 is that: the monomer C is hydroxypropyl methacrylate.
Example 20
The difference from example 19 is that: the initiator is dimethyl azodiisobutyrate.
Example 21
The difference from example 19 is that: the reducing agent is thiourea dioxide.
Example 22
The difference from example 19 is that: the chain transfer agent is n-dodecyl mercaptan.
Example 23
The difference from example 19 is that: the alkali solution for adjusting the pH in step S3 is a sodium hydroxide solution with a mass concentration of 5%.
Example 24
The difference from example 19 is that: the initiator is dimethyl azodiisobutyrate, the reducing agent is thiourea dioxide, the chain transfer agent is n-dodecyl mercaptan, and the alkali liquor for adjusting the pH in the step S3 is a sodium hydroxide solution with the mass concentration of 5%.
Comparative example 1
The difference from example 4 is that:
the amounts of the components of the reaction were as follows:
9kg of deionized water; 19kg of composition A; 7kg of initiator; 21kg of monomer B; 17kg of monomer C; 1kg of reducing agent; 0.5kg of chain transfer agent.
Comparative example 2
The difference from example 4 is that:
the amounts of the components of the reaction were as follows:
3kg of deionized water; 36kg of composition A; 2kg of initiator; 14kg of monomer B; 12kg of monomer C; 5kg of reducing agent; 2.5kg of chain transfer agent.
Experiment 1
Testing according to the related standard of cement mortar fluidity in GB/T8077-2012 'concrete admixture homogeneity test method', detecting initial mortar fluidity (mm) and 1h mortar fluidity (mm), replacing standard sand with different adsorption type fine aggregates, wherein the fine aggregates respectively select stone field environment-friendly recycled stone powder, environment-friendly recycled fine aggregate and river sand, the water-cement ratio is 0.5, the mixing amount of a water reducing agent is 2.0%, and a commercially available polycarboxylic acid water reducing agent is used as a blank group.
In this experiment, a polycarboxylic acid water reducing agent having a product number of 1 from Ji south east Zhou great industries, chemical Co., Ltd was used as the polycarboxylic acid water reducing agent.
Wherein, the fineness modulus of the environment-friendly recycled stone powder in the stone yard is 3.2, and the mud content is 6.9%; the fineness modulus of the environment-friendly recycled ground aggregate is 3.0, and the mud content is 7.3%; the fineness modulus of the river sand is 2.6, and the mud content is 5.9%.
The data for the test of experiment 1 are shown in Table 1.
TABLE 1
Experiment 2
The water reducing rate (%) of the high slump loss resistant water reducing agent prepared in the above examples and comparative examples was determined according to the determination method of 6.5.2 water reducing rate determination in GB/T8076-2008 "concrete admixture".
The data from experiment 2 are shown in Table 2.
TABLE 2
Experiment 3
The initial slump (mm), the expansion degree (mm), the slump (mm) of 2h and the expansion degree (mm) of the concrete are detected according to a 3.1 slump and slump expansion method in GB/T50080-2002 standard of a common concrete mixture performance test method, fine aggregates adsorbed in different degrees are used as a substitute, the fine aggregates are respectively selected from environment-friendly recycled stone powder, river sand 1, river sand 2 and environment-friendly recycled ground aggregates, the mixing amount of a water reducer is 3.5%, and a commercially available polycarboxylic acid water reducer is used as a blank group.
In this experiment, a polycarboxylic acid water reducing agent having a product number of 1 from Ji south east Zhou great industries, chemical Co., Ltd was used as the polycarboxylic acid water reducing agent.
Wherein, the fineness modulus of the environment-friendly recycled stone powder in the stone yard is 3.2, and the mud content is 6.9%; the fineness modulus of the river sand 1 is 2.6, and the mud content is 5.9%; the fineness modulus of the river sand 2 is 2.7, and the mud content is 2%; the fineness modulus of the environment-friendly recycled ground aggregate is 3.0, and the mud content is 7.3%.
The mix proportion of the concrete for detection is as follows: cement 240kg/m3(ii) a 60kg/m of mineral powder3(ii) a 60kg/m of fly ash3(ii) a 780kg/m of sand3(ii) a Stone 1050kg/m3(ii) a 160kg/m water3。
The data for experiment 3 are shown in Table 3.
TABLE 3
Experiment 4
The 3d compressive strength (MPa), the 7d compressive strength (MPa) and the 28d compressive strength (MPa) of the concrete in experiment 3 are detected according to a third chapter cubic compressive strength test in GBJ51-85 ordinary concrete mechanical property test method.
The data for the assay of experiment 4 are shown in Table 4.
TABLE 4
According to comparison of blank groups of recycled stone powder, recycled ground aggregate and river sand in the table 1 with data of an embodiment, when mud content and powder content in the aggregate are high, the water reducing agent is easy to adsorb, so that the water reducing rate of the water reducing agent is easy to influence, and further, performances such as fluidity of mortar, slump of concrete, compressive strength of concrete and the like are easy to influence; the high slump-retaining water reducing agent prepared by the method is added into concrete, so that the adsorption effect of the powder content and the mud content in aggregate can be better resisted, the water reducing rate of the high slump-retaining water reducing agent is less susceptible, the water reducing effect of the high slump-retaining water reducing agent can be better improved, the slump-retaining effect of the high slump-retaining water reducing agent can be better improved, and the variation of the slump of the concrete along with time is smaller.
According to the comparison of the data of the examples in tables 1, 3 and 4 with the data of the blank group, the addition of the high slump loss resistant water reducing agent prepared by the method in the invention into concrete not only does not cause negative influence on the performance of the concrete, but also is beneficial to better reducing the slump variable quantity of the concrete and simultaneously is beneficial to better improving the compressive strength of the concrete to a certain extent.
According to the comparison of the data of the example 4 and the comparative examples 1 and 2 in the tables 1 to 4, only when the components react at a specific ratio, the high slump-retaining water reducer generated by the reaction can better resist the adsorption of clay and stone powder in aggregate, so that the water reducing rate of the high slump-retaining water reducer is higher, and meanwhile, the performances of the concrete such as mortar fluidity, slump and compressive strength are better improved.
According to the comparison of the data of examples 4 to 12 in tables 1 to 4, the composition A is favorably matched and reacted with the monomer B and the monomer C better by controlling the composition components and the using amounts of the components, so that the water reducing rate of the prepared water reducing agent is higher, and simultaneously, the slump of concrete is favorably kept better, the variation of the slump of the concrete along with the change of time is smaller, the fluidity of mortar is higher, and in addition, the compressive strength of the concrete is favorably and better improved. Meanwhile, only when the composition A is formed by mutually cooperating the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl propylene sulfonic acid, the slump retaining effect and the water reducing effect of the prepared high slump retaining water reducing agent can be better improved, so that the slump variation of the concrete is smaller, the water reducing rate of the high slump retaining water reducing agent is higher, the mortar fluidity and the compressive strength of the concrete are better improved, any component is lacked, and the performance of the concrete is easily greatly influenced.
According to the data comparison of the examples 12 to 24 in the tables 1 to 4, the raw materials adopted in the reaction process are controlled, so that the reaction is favorably promoted to be better carried out, the water reducing rate of the high slump retaining water reducing agent obtained by the reaction is higher, and meanwhile, the slump retaining effect of the high slump retaining water reducing agent is better, so that the slump variation is favorably reduced, and the compressive strength of the concrete is favorably improved.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A preparation method of a high slump loss resistant water reducing agent is characterized by comprising the following steps: the method comprises the following steps:
s1, adding deionized water and the composition A into a reaction vessel according to the mass portion ratio, raising the temperature to 70-85 ℃, and forming a premix after the composition A is completely dissolved;
s2, adding an initiator into the pre-mixture, dropwise adding the monomer B and the monomer C, dropwise adding a mixed solution of a reducing agent and a chain transfer agent, preserving heat, and stirring for reacting for 3-5 hours;
s3, after the reaction is finished, dropwise adding alkali liquor to adjust the pH value to 6-8, and obtaining the high slump loss resistant water reducer;
the weight portions of the components are as follows:
4-8 parts of deionized water;
20-35 parts of a composition A;
3-6 parts of an initiator;
15-20 parts of a monomer B;
13-16 parts of a monomer C;
2-4 parts of a reducing agent;
1-2 parts of a chain transfer agent;
the composition A is formed by mixing one or more monomers A, and the molecular structure of the monomers A is as follows:
wherein R3 is alkenyl;
the monomer B is any one of allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether, isoamylol polyoxyethylene ether, vinyl butyl ether polyoxyethylene ether or isobutenol polyoxyethylene ether;
the monomer C is any one of hydroxypropyl acrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate and hydroxyethyl methacrylate.
2. The preparation method of the high slump loss resistant water reducing agent according to claim 1, characterized by comprising the following steps: the composition A comprises the following components in parts by mass:
8-13 parts of propylene sulfonic acid;
7-10 parts of methacrylic sulfonic acid;
10-12 parts of vinyl sulfonic acid.
3. The preparation method of the high slump loss resistant water reducing agent according to claim 2, characterized by comprising the following steps: the composition A comprises the following components in parts by mass:
9 parts of propylene sulfonic acid;
10 parts of methacrylic sulfonic acid;
and 11 parts of vinyl sulfonic acid.
4. The preparation method of the high slump loss resistant water reducing agent according to claim 3, characterized by comprising the following steps: the monomer B is isobutylene alcohol polyoxyethylene ether.
5. The preparation method of the high slump loss resistant water reducing agent according to claim 4, characterized by comprising the following steps: the monomer C is hydroxypropyl methacrylate.
6. The preparation method of the high slump loss resistant water reducing agent according to any one of claims 1 to 5, characterized by comprising the following steps: the initiator is dimethyl azodiisobutyrate.
7. The preparation method of the high slump loss resistant water reducing agent according to any one of claims 1 to 5, characterized by comprising the following steps: the reducing agent is thiourea dioxide.
8. The preparation method of the high slump loss resistant water reducing agent according to any one of claims 1 to 5, characterized by comprising the following steps: the chain transfer agent is n-dodecyl mercaptan.
9. The preparation method of the high slump loss resistant water reducing agent according to any one of claims 1 to 5, characterized by comprising the following steps: the alkali solution used for adjusting the pH in the step S3 is a sodium hydroxide solution.
10. The high slump loss resistant water reducing agent is characterized in that: the high slump-retaining water reducer prepared by the preparation method of any one of claims 1 to 9.
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Cited By (1)
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| CN112920339A (en) * | 2021-01-29 | 2021-06-08 | 湖北工业大学 | Low-molecular-weight polymer for mud-resistant concrete and preparation method thereof |
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