CN112028538B - Green and environment-friendly water reducing agent and recycled concrete using same - Google Patents
Green and environment-friendly water reducing agent and recycled concrete using same Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
- C08G14/02—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes
- C08G14/04—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols
- C08G14/12—Chemically modified polycondensates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
- C08G14/02—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes
- C08G14/04—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols
- C08G14/06—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols and monomers containing hydrogen attached to nitrogen
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- 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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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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Abstract
The application relates to a green environment-friendly water reducing agent and recycled concrete using the same, and relates to the technical field of concrete and admixtures thereof, wherein the water reducing agent is prepared from the following components in parts by weight: 55-75 parts of sulfamate water reducing agent, 15-25 parts of hydroxypropyl methyl cellulose, 5-15 parts of triisopropanolamine, 5-15 parts of 2-hydroxyethylamine and 2-8 parts of anhydrous sodium metasilicate; the recycled concrete is prepared from the following components in parts by weight: 55-65 parts of recycled coarse aggregate, 15-25 parts of natural coarse aggregate, 10-20 parts of portland cement, 20-40 parts of fine sand, 18-32 parts of fly ash, 20-30 parts of activated water, 5-10 parts of soybean fiber/carbon fiber/epoxy resin composite fiber and 3-5 parts of a water reducing agent. The application has the effect of improving the defect that the water reducing effect of the existing water reducing agent on the ultra-fine particle cement is weak.
Description
Technical Field
The application relates to the technical field of concrete and additives thereof, in particular to a green environment-friendly water reducing agent and recycled concrete using the same.
Background
The water reducing agent is a concrete admixture for reducing the water consumption for mixing under the condition of maintaining the slump constant of concrete basically. The water reducing agent has a certain dispersion effect on the cementing material cement particles after being added into the concrete mixture, thereby reducing the agglomeration of the cement particles, improving the fluidity of the concrete mixture and reducing the unit water consumption of the concrete mixture.
The existing cement particles are fine, and when the existing cement particles meet mixing water, the cement particles can attract each other under the action of electrostatic attraction and the like, so that a three-dimensional flocculation structure is formed. About 10% -30% of the mixing water is wrapped in the flocculation structure and can not freely flow, so that the lubricating effect is lost, and the fluidity of the mixture is greatly reduced. The common water reducing agent can not effectively disperse the flocculated cement with ultra-fine particles, so that the water reducing effect is weakened.
Disclosure of Invention
The application aims to provide a green environment-friendly water reducer for overcoming the defect that the water reducing effect of the existing water reducer on ultra-fine particle cement is weak.
The second purpose of the application is to provide recycled concrete using the water reducing agent.
In a first aspect, the application provides a green water reducing agent, which adopts the following technical scheme:
the green environment-friendly water reducing agent is prepared from the following components in parts by weight: 55-75 parts of sulfamate water reducing agent, 15-25 parts of hydroxypropyl methyl cellulose, 5-15 parts of triisopropanolamine, 5-15 parts of 2-hydroxyethylamine and 2-8 parts of anhydrous sodium metasilicate.
By adopting the technical scheme, the sulfamate water reducer is high in water reducing rate, environment-friendly and non-toxic, the molecular structure of the hydroxypropyl methyl cellulose has a plurality of hydroxyl groups, the hydroxypropyl methyl cellulose has a good water retention effect, and the sulfamate water reducer is compounded with the sulfamate water reducer for use, so that the defect that concrete is easy to segregate and bleed due to the sulfamate water reducer is overcome;
the hydroxypropyl methyl cellulose also has certain adsorption performance, can be adsorbed on the surface of superfine cement particles to generate a certain micro-dispersion effect, so that the water reducing effect of the water reducing agent is further improved;
cationic small monomers in the molecular structures of triisopropanolamine and 2-hydroxyethylamine are easy to adsorb on the surfaces of extremely fine cement gelling material particles showing electronegativity, so that electrostatic repulsion is generated on the surfaces of the extremely fine particles to generate a certain repulsion effect on water molecules, and the effect of dispersing and flocculating is achieved;
the water reducing agent prepared by the mutual synergistic cooperation of the components has high-efficiency water reducing performance on ultra-fine cement particles, and can effectively improve the fluidity of a cement cementing material and reduce the bleeding performance of concrete.
Preferably, the preparation method of the sulfamate water reducer comprises the following steps: 1) heating to dissolve sodium sulfanilate, phenol, urea and sodium pyrophosphate in deionized water, and stirring uniformly to obtain a dissolved solution; 2) slowly dripping formaldehyde into the dissolved solution, and condensing for 2h at constant temperature; 3) preparing a sodium hydroxide solution with the mass concentration of 20%; 4) adding the sodium hydroxide solution prepared in the step 3) into the condensation reaction liquid in the step 2) to enable reactants to be rearranged, wherein the rearrangement reaction time is 8 h; 5) and (3) cooling after the reaction is finished, and stirring reactants continuously in the cooling process to prepare the sulfamate water reducer.
By adopting the technical scheme, the sulfamate water reducer prepared by using the urea and the sodium pyrophosphate monomer has the effects of effectively improving the dispersibility and the retarding property of the sulfamate water reducer, and can be added into a concrete system to improve the segregation and bleeding property of the concrete by improving the pore structure among hydrated product crystals.
Preferably, the molar ratio of the sodium sulfanilate to the phenol to the formaldehyde is 1: (1.25-1.75): 2.75.
by adopting the technical scheme, the molar ratio of the sodium sulfanilate, the phenol and the formaldehyde is controlled within the range, and the water reducing property, the bleeding resistance and the like of the prepared sulfamate water reducing agent are greatly improved.
Preferably, the molar ratio of the (sodium sulfanilate + phenol) to the urea is 1: (0.05-0.15).
By adopting the technical scheme, the molar ratio of the (sodium sulfanilate + phenol) to the urea is controlled within the range, so that the polymerization degree between the urea and other components is favorably improved, and the water reducing property of the prepared sulfamate water reducing agent is improved.
Preferably, the molar ratio of the urea to the sodium pyrophosphate is 1: (0.75 to 1).
By adopting the technical scheme, the molar ratio of the urea to the sodium pyrophosphate is controlled within a proper range, so that efficient polymerization reaction between the two monomers and other components is ensured, and the polymerization reaction effect is ensured, so that the prepared sulfamate water reducer has high-efficiency water reducing property.
Preferably, the condensation reaction temperature in the step 2) is 75-85 ℃, and the rearrangement reaction temperature in the step 4) is 85-95 ℃.
By adopting the technical scheme, the reaction temperature of the step 2) and the step 4) is controlled within a proper range, and the effect of polymerization reaction is improved.
Preferably, the sodium hydroxide solution is added in the step 4) until the pH of the condensation reaction solution is adjusted to 8.5.
By adopting the technical scheme, the sodium hydroxide solution is used for adjusting the pH value of the condensation reaction liquid, after the condensation reaction liquid is adjusted to be alkaline, the condensation reaction product can be subjected to a rephotography reaction again, and finally the sulfamate water reducer with high-efficiency water reducing property is prepared.
Preferably, the component also comprises 1-5 parts of citric acid.
By adopting the technical scheme, the citric acid and the free metal ions in the concrete system form the high-stability multi-element cyclic chelate to reduce the concentration of the free metal ions in the concrete system, so that the hydration reaction speed is greatly reduced, and the setting time of the concrete is prolonged. The citric acid is added into the water reducing agent system, and is in synergistic cooperation with other components, so that the citric acid has a good synergistic effect and is used for further improving the retarding performance of the water reducing agent.
Preferably, the preparation method of the water reducing agent comprises the following steps: 1) firstly, adding deionized water into a stirring tank, then adding a sulfamate water reducer and hydroxypropyl methyl cellulose, and firstly stirring and dissolving the sulfamate water reducer and the hydroxypropyl methyl cellulose; 2) adding triisopropanolamine, 2-hydroxyethylamine and anhydrous sodium metasilicate into the stirring tank, and stirring for 15-25 min to obtain a finished mother solution; 3) carrying out suction filtration treatment on the finished mother liquor; 4) and finally, according to the following steps of 1: and (12) diluting the finished product mother liquor by using deionized water according to the proportion, and uniformly stirring to obtain the finished product of the water reducing agent.
In a second aspect, the present application provides a recycled concrete using the above water reducing agent, which adopts the following technical scheme: the recycled concrete using the water reducing agent is prepared from the following components in parts by weight: 55-65 parts of recycled coarse aggregate, 15-25 parts of natural coarse aggregate, 10-20 parts of portland cement, 20-40 parts of fine sand, 18-32 parts of fly ash, 20-30 parts of activated water, 5-10 parts of soybean fiber/carbon fiber/epoxy resin composite fiber and 3-5 parts of a water reducing agent.
By adopting the technical scheme, the mixing water consumption of the recycled concrete using the water reducing agent in the preparation process is obviously reduced, and the recycled concrete has good segregation resistance and retardation;
the soybean fiber has good antibacterial, air-permeable and moisture-removing performances; the carbon fiber has excellent mechanical property and certain flexibility; the soybean fiber and the carbon fiber are used for modifying the epoxy resin, and are finally added into a concrete system in a composite fiber form, so that the strength performance of the concrete is favorably improved, the bleeding performance of the concrete is reduced, and the concrete has good air permeability due to the special molecular structure of the composite fiber, so that the performance of the concrete is improved from multiple aspects by the soybean fiber/carbon fiber/epoxy resin composite fiber.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the water reducing agent prepared by the mutual synergistic cooperation of the components disclosed by the application has high-efficiency water reducing performance on ultra-fine cement particles, and can effectively improve the fluidity of a cement cementing material and reduce the bleeding performance of concrete;
2. the water reducing agent is added into a concrete system, and the segregation bleeding property of the concrete can be improved by improving the pore structure among hydrated product crystals;
3. when the sulfamate water reducer is prepared, the molar ratio of each component is controlled in a proper range, so that various performances of the prepared sulfamate water reducer such as water reducing performance and the like can be effectively improved;
4. the citric acid is added into the water reducing agent system, and is in synergistic cooperation with other components, so that the citric acid has a good synergistic effect and is used for further improving the retarding performance of the water reducing agent.
Detailed Description
The components disclosed in this application are all available from the market.
The embodiment of the application discloses a green water reducing agent.
Example 1
The water reducing agent is prepared from the following components in parts by weight: 65 parts of sulfamate water reducing agent, 20 parts of hydroxypropyl methylcellulose, 10 parts of triisopropanolamine, 10 parts of 2-hydroxyethylamine and 5 parts of anhydrous sodium metasilicate;
the preparation method of the sulfamate water reducer comprises the following steps:
1) preparing raw materials: preparing raw materials of sodium sulfanilate, phenol, urea, sodium pyrophosphate and formaldehyde, wherein the molar ratio of the sodium sulfanilate to the phenol to the formaldehyde is 1: 1.5: 2.75 (sodium sulfanilate + phenol) to urea molar ratio 1: 0.1, the molar ratio of urea to sodium pyrophosphate is 1: 0.86 of the total weight of the mixture;
2) heating to dissolve sodium sulfanilate, phenol, urea and sodium pyrophosphate in deionized water, and stirring uniformly to obtain a dissolved solution;
3) slowly dripping formaldehyde into the dissolved solution, and condensing for 2 hours at a constant temperature, wherein the condensation reaction temperature is 80 ℃;
4) preparing a sodium hydroxide solution with the mass concentration of 20%;
5) adding the sodium hydroxide solution prepared in the step 4) into the condensation reaction liquid prepared in the step 3) until the pH of the condensation reaction liquid is adjusted to 8.5, so that the reactants are rearranged, wherein the rearrangement reaction time is 8h, and the rearrangement reaction temperature is 90 ℃;
6) cooling after the reaction is finished, and stirring reactants continuously in the cooling process to prepare the sulfamate water reducer; the preparation method of the water reducing agent comprises the following steps:
1) firstly, adding deionized water into a stirring tank, then adding a sulfamate water reducer and hydroxypropyl methyl cellulose, and firstly stirring and dissolving the sulfamate water reducer and the hydroxypropyl methyl cellulose;
2) adding triisopropanolamine, 2-hydroxyethylamine and anhydrous sodium metasilicate into the stirring tank, and stirring for 20min to obtain a finished mother solution;
3) carrying out suction filtration treatment on the finished mother liquor;
4) and finally, according to the following steps of 1: diluting the finished product mother liquor by using deionized water according to the proportion of 12, and uniformly stirring to obtain a finished product of the water reducing agent;
the recycled concrete using the water reducer is prepared from the following components in parts by weight: 60 parts of recycled coarse aggregate, 20 parts of natural coarse aggregate, 15 parts of portland cement, 30 parts of fine sand, 25 parts of fly ash, 25 parts of activated water, 12.5 parts of soybean fiber/carbon fiber/epoxy resin composite fiber and 4 parts of water reducing agent.
Example 2
The water reducing agent is prepared from the following components in parts by weight: 55 parts of sulfamate water reducing agent, 15 parts of hydroxypropyl methylcellulose, 5 parts of triisopropanolamine, 5 parts of 2-hydroxyethylamine and 2 parts of anhydrous sodium metasilicate;
the preparation method of the sulfamate water reducer comprises the following steps:
1) preparing raw materials: preparing raw materials of sodium sulfanilate, phenol, urea, sodium pyrophosphate and formaldehyde, wherein the molar ratio of the sodium sulfanilate to the phenol to the formaldehyde is 1: 1.25: 2.75 (sodium sulfanilate + phenol) to urea molar ratio 1: 0.05, the molar ratio of urea to sodium pyrophosphate is 1: 0.75;
2) heating to dissolve sodium sulfanilate, phenol, urea and sodium pyrophosphate in deionized water, and stirring uniformly to obtain a dissolved solution;
3) slowly dripping formaldehyde into the dissolved solution, and condensing for 2 hours at a constant temperature, wherein the condensation reaction temperature is 75 ℃;
4) preparing a sodium hydroxide solution with the mass concentration of 20%;
5) adding the sodium hydroxide solution prepared in the step 4) into the condensation reaction liquid prepared in the step 3) until the pH of the condensation reaction liquid is adjusted to 8.5, so that the reactants are rearranged, wherein the rearrangement reaction time is 8h, and the rearrangement reaction temperature is 85 ℃;
6) cooling after the reaction is finished, and stirring reactants continuously in the cooling process to prepare the sulfamate water reducer; the preparation method of the water reducing agent comprises the following steps:
1) firstly, adding deionized water into a stirring tank, then adding a sulfamate water reducer and hydroxypropyl methyl cellulose, and firstly stirring and dissolving the sulfamate water reducer and the hydroxypropyl methyl cellulose;
2) adding triisopropanolamine, 2-hydroxyethylamine and anhydrous sodium metasilicate into the stirring tank, and stirring for 15min to obtain a finished mother solution;
3) carrying out suction filtration treatment on the finished mother liquor;
4) and finally, according to the following steps of 1: diluting the finished product mother liquor by using deionized water according to the proportion of 12, and uniformly stirring to obtain a finished product of the water reducing agent;
the recycled concrete using the water reducer is prepared from the following components in parts by weight: 55 parts of recycled coarse aggregate, 15 parts of natural coarse aggregate, 10 parts of portland cement, 20 parts of fine sand, 18 parts of fly ash, 20 parts of activated water, 5 parts of soybean fiber/carbon fiber/epoxy resin composite fiber and 3 parts of water reducing agent.
Example 3
The water reducing agent is prepared from the following components in parts by weight: 75 parts of sulfamate water reducing agent, 25 parts of hydroxypropyl methylcellulose, 15 parts of triisopropanolamine, 15 parts of 2-hydroxyethylamine and 8 parts of anhydrous sodium metasilicate;
the preparation method of the sulfamate water reducer comprises the following steps:
1) preparing raw materials: preparing raw materials of sodium sulfanilate, phenol, urea, sodium pyrophosphate and formaldehyde, wherein the molar ratio of the sodium sulfanilate to the phenol to the formaldehyde is 1: 1.75: 2.75 (sodium sulfanilate + phenol) to urea molar ratio 1: 0.15, the molar ratio of urea to sodium pyrophosphate is 1: 1;
2) heating to dissolve sodium sulfanilate, phenol, urea and sodium pyrophosphate in deionized water, and stirring uniformly to obtain a dissolved solution;
3) slowly dripping formaldehyde into the dissolved solution, and condensing for 2 hours at a constant temperature, wherein the condensation reaction temperature is 85 ℃;
4) preparing a sodium hydroxide solution with the mass concentration of 20%;
5) adding the sodium hydroxide solution prepared in the step 4) into the condensation reaction liquid prepared in the step 3) until the pH of the condensation reaction liquid is adjusted to 8.5, so that the reactants are rearranged, wherein the rearrangement reaction time is 8h, and the rearrangement reaction temperature is 95 ℃;
6) cooling after the reaction is finished, and stirring reactants continuously in the cooling process to prepare the sulfamate water reducer; the preparation method of the water reducing agent comprises the following steps:
1) firstly, adding deionized water into a stirring tank, then adding a sulfamate water reducer and hydroxypropyl methyl cellulose, and firstly stirring and dissolving the sulfamate water reducer and the hydroxypropyl methyl cellulose;
2) adding triisopropanolamine, 2-hydroxyethylamine and anhydrous sodium metasilicate into the stirring tank, and stirring for 25min to obtain a finished mother solution;
3) carrying out suction filtration treatment on the finished mother liquor;
4) and finally, according to the following steps of 1: diluting the finished product mother liquor by using deionized water according to the proportion of 12, and uniformly stirring to obtain a finished product of the water reducing agent;
the recycled concrete using the water reducer is prepared from the following components in parts by weight: 60 parts of recycled coarse aggregate, 25 parts of natural coarse aggregate, 20 parts of portland cement, 40 parts of fine sand, 32 parts of fly ash, 30 parts of activated water, 10 parts of soybean fiber/carbon fiber/epoxy resin composite fiber and 5 parts of water reducing agent.
Example 4
The difference between the embodiment and the embodiment 1 is that the formula of the water reducing agent also comprises 1 part of citric acid.
Example 5
The difference between the embodiment and the embodiment 1 is that the formula of the water reducing agent also comprises 2.5 parts of citric acid.
Example 6
The difference between the embodiment and the embodiment 1 is that the formula of the water reducing agent also comprises 5 parts of citric acid.
Example 7
The difference between this example and example 1 is that the urea component in the formulation of the sulfamate-based water reducing agent was deleted when the sulfamate-based water reducing agent was prepared.
Example 8
This example is different from example 1 in that the sodium pyrophosphate component in the formulation of the sulfamate-based water reducing agent was deleted when preparing the sulfamate-based water reducing agent.
Example 9
The difference between this example and example 1 is that the urea component and the sodium pyrophosphate component in the formulation of the sulfamate-based water reducing agent were deleted at the same time when the sulfamate-based water reducing agent was prepared.
Example 10
The difference between this example and example 1 is that the molar ratio of sodium sulfanilate, phenol, and formaldehyde is 1: 1.25: 2.75.
example 11
The difference between this example and example 1 is that the molar ratio of sodium sulfanilate, phenol, and formaldehyde is 1: 1.75: 2.75.
example 12
The difference between this example and example 1 is that the molar ratio of sodium sulfanilate, phenol, and formaldehyde is 1: 1: 2.75.
example 13
The difference between this example and example 1 is that the molar ratio of sodium sulfanilate, phenol, and formaldehyde is 1: 2: 2.75.
example 14
This example differs from example 1 in that the molar ratio of (sodium sulfanilate + phenol) to urea is 1: 0.05.
example 15
This example differs from example 1 in that the molar ratio of (sodium sulfanilate + phenol) to urea is 1: 0.15.
example 16
This example differs from example 1 in that the molar ratio of (sodium sulfanilate + phenol) to urea is 1: 0.02.
example 17
This example differs from example 1 in that the molar ratio of (sodium sulfanilate + phenol) to urea is 1: 0.18.
example 18
This example differs from example 1 in that the molar ratio of urea to sodium pyrophosphate was 1: 0.75.
example 19
This example differs from example 1 in that the molar ratio of urea to sodium pyrophosphate was 1: 1.
example 20
This example differs from example 1 in that the molar ratio of urea to sodium pyrophosphate was 1: 0.5.
example 21
This example differs from example 1 in that the molar ratio of urea to sodium pyrophosphate was 1: 1.25.
comparative example 1
A water reducing agent is different from the water reducing agent in example 1 in that: the hydroxypropyl methylcellulose in the water reducing agent formula is deleted.
Comparative example 2
A water reducing agent is different from the water reducing agent in example 1 in that: the triisopropanolamine and 2-hydroxyethylamine in the water reducing agent formula are removed.
Comparative example 3
A recycled concrete which is different from example 1 in that: the water reducing agent of sulfamate system obtained in example 9 was used as the water reducing agent of sulfamate system, and the water reducing agent of sulfamate system was directly added to the concrete system without using the water reducing agent of sulfamate system obtained in example 1.
Comparative example 4
A recycled concrete using the water reducing agent of example 1 is different from example 1 in that: and (3) deleting the soybean fiber/carbon fiber/epoxy resin composite fiber in the formula of the recycled concrete.
Performance test
The water reducing agents and the concretes prepared in examples 1 to 21 and comparative examples 1 to 4 were sampled, and the samples were subjected to the following performance test tests.
1. Water reducing performance detection test for water reducing agent
According to GB/T1346-2011, the water consumption of the water reducing agent is calculated by measuring the water consumption of the standard consistency of the cement paste and the water consumption of the standard consistency of the cement paste doped with the water reducing agent by a constant water quantity method, the water consumption of the standard consistency of the cement paste doped with the water reducing agent is checked by a water quantity adjusting method, so that the water reducing rate of the water reducing agent is measured, the higher the water reducing rate is, the stronger the water reducing performance of the water reducing agent is, and the detection result is recorded in Table 1.
2. Test for testing bleeding resistance of concrete
The bleeding rate of the concrete mixture is calculated according to the detection of GB 8076-.
3. Concrete slow setting performance detection test
According to GB/T1346-2011, the initial setting time and the final setting time of the concrete mixture are recorded, the setting time difference is calculated, the retardation performance of the concrete mixture is represented by the setting time difference, the larger the setting time difference is, the stronger the concrete performance of the concrete mixture is, and the detection result is recorded in Table 1.
4. Concrete strength performance test
The test is carried out according to GB/T50081 standard of test method for mechanical properties of common concrete, the test results are represented by compressive strength and are recorded in Table 2.
TABLE 1
TABLE 2
Analysis of test data
1. The following data were obtained from the test data of examples 1 to 3 in tables 1 and 2: the addition amount of the water reducing agent and each component in the concrete is changed in a proper range, the water reducing agent always keeps excellent water reducing performance, and the concrete always keeps excellent bleeding resistance, retardation and compressive strength;
2. the following data were obtained from the test data of examples 4 to 6 in tables 1 and 2: the citric acid component is added into the formula of the water reducing agent, so that the water reducing performance of the water reducing agent and the bleeding resistance, the retardation and the compressive strength of concrete are improved to a certain extent. The improvement degree of the retarding performance of the concrete is most obvious, which shows that the citric acid and other components of the water reducing agent have a compound synergistic effect and have the most obvious effect on the retarding performance of the concrete;
3. the following data were obtained from the test data of examples 7 to 9 in tables 1 and 2: the urea and the sodium pyrophosphate in the formula of the sulfamate water reducer are deleted, so that the water reducing performance of the water reducer is adversely affected, and when the urea and the sodium pyrophosphate are deleted simultaneously in example 9, the water reducing performance of the water reducer, the bleeding resistance of concrete and the like are obviously reduced, which indicates that when the sulfamate water reducer is prepared, the urea and the sodium pyrophosphate monomer are added into a system, so that various performances of the sulfamate water reducer are favorably enhanced;
4. the following data were obtained from the test data of examples 10 to 21 in tables 1 and 2: when the molar ratio of the sodium sulfanilate, the phenol and the formaldehyde, the molar ratio of the sodium sulfanilate and the phenol, and the molar ratio of the urea and the sodium pyrophosphate are controlled within a proper range, the water reducing performance of the water reducing agent and various performances of concrete can be ensured to be improved;
5. according to the comparison of the test data of example 1 and comparative example 1 in tables 1 and 2, it can be seen that: the hydroxypropyl methyl cellulose in the formula of the water reducing agent is deleted, and the components in the formula of the water reducing agent lose a certain synergistic effect, so that the water reducing performance of the water reducing agent is greatly reduced;
6. according to the comparison of the test data of example 1 and comparative example 2 in tables 1 and 2, it can be seen that: triisopropanolamine and 2-hydroxyethylamine in the formula of the water reducing agent are removed, and a certain synergistic effect is lost among the components in the formula of the water reducing agent, so that the water reducing performance of the water reducing agent is greatly reduced;
7. according to the comparison of the test data of example 1 and comparative example 3 in tables 1 and 2, it can be seen that: the common sulfamate water reducer is used for replacing the water reducer in the application, so that the water reducing performance of the water reducer on concrete is greatly reduced, and the water reducing performance of the water reducer provided by the application is remarkably improved compared with that of the existing water reducer;
8. according to the comparison of the test data of example 1 and comparative example 4 in tables 1 and 2, it can be seen that: the soybean fiber/carbon fiber/epoxy resin composite fiber is added into the concrete formula, so that the compressive strength of the concrete mixture is obviously improved, and the retardation performance of the concrete mixture can be improved to a certain extent.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. The green environment-friendly water reducing agent is characterized in that: the composition is prepared from the following components in parts by weight: 55-75 parts of sulfamate water reducing agent, 15-25 parts of hydroxypropyl methyl cellulose, 5-15 parts of triisopropanolamine, 5-15 parts of 2-hydroxyethylamine and 2-8 parts of anhydrous sodium metasilicate;
the preparation method of the sulfamate water reducer comprises the following steps: 1) heating to dissolve sodium sulfanilate, phenol, urea and sodium pyrophosphate in deionized water, and stirring uniformly to obtain a dissolved solution; 2) slowly dripping formaldehyde into the dissolved solution, and condensing for 2h at constant temperature; 3) preparing a sodium hydroxide solution with the mass concentration of 20%; 4) adding the sodium hydroxide solution prepared in the step 3) into the condensation reaction liquid in the step 2) to enable reactants to be rearranged, wherein the rearrangement reaction time is 8 h; 5) cooling after the reaction is finished, and stirring reactants continuously in the cooling process to prepare the sulfamate water reducer;
the molar ratio of the sodium sulfanilate to the phenol to the formaldehyde is 1: (1.25-1.75): 2.75;
the molar ratio of the sodium sulfanilate + phenol to the urea is 1: (0.05-0.15);
the molar ratio of the urea to the sodium pyrophosphate is 1: (0.75 to 1);
the condensation reaction temperature in the step 2) is 75-85 ℃, and the rearrangement reaction temperature in the step 4) is 85-95 ℃.
2. The green environment-friendly water reducing agent according to claim 1, characterized in that: the addition amount of the sodium hydroxide solution in the step 4) is until the pH of the condensation reaction liquid is adjusted to 8.5.
3. The green environment-friendly water reducing agent according to claim 1, characterized in that: the composition also comprises 1-5 parts of citric acid.
4. The green environment-friendly water reducing agent according to claim 1, characterized in that: the preparation method of the water reducing agent comprises the following steps: 1) firstly, adding deionized water into a stirring tank, then adding a sulfamate water reducer and hydroxypropyl methyl cellulose, and firstly stirring and dissolving the sulfamate water reducer and the hydroxypropyl methyl cellulose; 2) adding triisopropanolamine, 2-hydroxyethylamine and anhydrous sodium metasilicate into the stirring tank, and stirring for 15-25 min to obtain a finished mother solution; 3) carrying out suction filtration treatment on the finished mother liquor; 4) and finally, according to the following steps of 1: and (12) diluting the finished product mother liquor by using deionized water according to the proportion, and uniformly stirring to obtain the finished product of the water reducing agent.
5. A recycled concrete using the water-reducing agent according to any one of claims 1 to 4, characterized in that: the composition is prepared from the following components in parts by weight: 55-65 parts of recycled coarse aggregate, 15-25 parts of natural coarse aggregate, 10-20 parts of portland cement, 20-40 parts of fine sand, 18-32 parts of fly ash, 20-30 parts of activated water, 5-10 parts of soybean fiber/carbon fiber/epoxy resin composite fiber and 3-5 parts of a water reducing agent.
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| CN1569723A (en) * | 2004-05-12 | 2005-01-26 | 刘明华 | Method for batch polymerization preparation of sulphamate composite high-efficiency water reducing agent and its acid and alkali |
| WO2015163468A1 (en) * | 2014-04-24 | 2015-10-29 | 東邦化学工業株式会社 | Admixture for hydraulic composition |
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| CN109336443A (en) * | 2018-09-26 | 2019-02-15 | 南通久拓混凝土有限公司 | A kind of concrete potent dose and its preparation process |
| CN110183161A (en) * | 2019-06-25 | 2019-08-30 | 成都建工赛利混凝土有限公司 | A kind of high-strength concrete mixture |
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| CN1569723A (en) * | 2004-05-12 | 2005-01-26 | 刘明华 | Method for batch polymerization preparation of sulphamate composite high-efficiency water reducing agent and its acid and alkali |
| WO2015163468A1 (en) * | 2014-04-24 | 2015-10-29 | 東邦化学工業株式会社 | Admixture for hydraulic composition |
| CN109111152A (en) * | 2018-08-31 | 2019-01-01 | 郭舒洋 | A kind of hydrated cementitious hardening additive and preparation method thereof |
| CN109336443A (en) * | 2018-09-26 | 2019-02-15 | 南通久拓混凝土有限公司 | A kind of concrete potent dose and its preparation process |
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