CN112830702A - High slump loss resistant additive suitable for concrete and preparation process thereof - Google Patents
High slump loss resistant additive suitable for concrete and preparation process thereof Download PDFInfo
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- CN112830702A CN112830702A CN202110084139.9A CN202110084139A CN112830702A CN 112830702 A CN112830702 A CN 112830702A CN 202110084139 A CN202110084139 A CN 202110084139A CN 112830702 A CN112830702 A CN 112830702A
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- 239000004567 concrete Substances 0.000 title claims abstract description 126
- 239000000654 additive Substances 0.000 title claims abstract description 36
- 230000000996 additive effect Effects 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 9
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 239000008139 complexing agent Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000012452 mother liquor Substances 0.000 claims abstract description 10
- 239000003755 preservative agent Substances 0.000 claims abstract description 10
- 230000002335 preservative effect Effects 0.000 claims abstract description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000003208 petroleum Substances 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical group C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 7
- 239000000176 sodium gluconate Substances 0.000 claims description 7
- 235000012207 sodium gluconate Nutrition 0.000 claims description 7
- 229940005574 sodium gluconate Drugs 0.000 claims description 7
- KYARBIJYVGJZLB-UHFFFAOYSA-N 7-amino-4-hydroxy-2-naphthalenesulfonic acid Chemical group OC1=CC(S(O)(=O)=O)=CC2=CC(N)=CC=C21 KYARBIJYVGJZLB-UHFFFAOYSA-N 0.000 claims description 6
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 5
- 239000000600 sorbitol Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 239000004568 cement Substances 0.000 description 16
- 238000006703 hydration reaction Methods 0.000 description 12
- 230000036571 hydration Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000003111 delayed effect Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- -1 polydimethylsiloxane Polymers 0.000 description 4
- 229920003064 carboxyethyl cellulose Polymers 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 239000013065 commercial product Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical group [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 2
- 229940048086 sodium pyrophosphate Drugs 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete, and particularly discloses a high slump retaining additive suitable for concrete and a preparation method thereof, wherein the high slump retaining additive comprises 3-8 parts of water-reducing mother liquor, 6-12 parts of a special slump retaining agent for machine-made sand, 2-3 parts of a defoaming agent, 2-3 parts of a preservative, 80-100 parts of water and 20-30 parts of a calcium ion complexing agent, and the preparation method comprises the following steps: and uniformly mixing and stirring the water-reducing mother liquor, the special slump retaining agent for machine-made sand, the defoaming agent, the preservative, water, the calcium ion complexing agent and the like to obtain the high slump retaining additive. The high slump loss resistant additive can be used for prolonging the initial setting time of concrete, reducing the slump of the concrete, and has the effect of improving the high slump loss resistance of the concrete.
Description
Technical Field
The application relates to the field of concrete, in particular to a high slump loss resistant additive suitable for concrete and a preparation process thereof.
Background
The concrete is artificial stone which is prepared by taking cement as a main cementing material, mixing water, sand, stones and chemical additives and mineral admixtures if necessary, uniformly stirring, densely forming, curing and hardening according to a proper proportion, and the slump loss of the concrete is a problem frequently encountered in the use process of commercial concrete, and is a phenomenon that the fluidity of the concrete is gradually reduced along with the increase of time.
In view of the above-mentioned related technologies, the inventor believes that there exists a new concrete that needs to be transported for a period of time from a concrete mixing plant to a construction site, and long-time transportation may cause great slump change of the concrete, and the concrete has an initial setting phenomenon, so that it is difficult to ensure that the new concrete can be normally used after being transported to the construction site.
Disclosure of Invention
In order to prolong the initial setting time of concrete and improve the high slump retaining property of fresh concrete, the application provides a high slump retaining additive suitable for concrete.
In order to obtain the high slump retaining additive suitable for concrete, the application provides a preparation method of the high slump retaining additive suitable for concrete.
The application provides a high slump loss resistant additive suitable for concrete, adopts following technical scheme:
the high slump retaining additive suitable for concrete is prepared by stirring and mixing the following raw materials in parts by weight:
30-80 parts of water-reducing mother liquor,
60-90 parts of special collapse-preventing agent for machine-made sand,
20-30 parts of a defoaming agent,
20-30 parts of a preservative agent,
80-100 parts of water, namely,
20-30 parts of calcium ion complexing agent.
By adopting the technical scheme, as the main components of the cement clinker are tricalcium silicate, tricalcium aluminate, dicalcium silicate and the like in the long-time transportation process of fresh concrete, after water is added into the cement, the tricalcium silicate and the tricalcium aluminate in the cement clinker can rapidly generate hydration reaction with the water, so that the fluidity of the concrete is changed, and the initial setting phenomenon is caused, the calcium ion complexing agent is added, and can perform complexing reaction with free calcium ions in the cement clinker to generate an unstable complex, the concentration of the calcium ions in a liquid phase is controlled at the initial stage of the hydration reaction to generate the delayed coagulation effect, and the unstable complex can be automatically decomposed along with the progress of the hydration process, so that the later stage hydration of the cement is not influenced, the hydration speed of the cement is delayed, the variable quantity of the slump of the concrete is reduced, and the high slump of the concrete is improved.
Preferably, the calcium ion complexing agent is 7-amino-4-hydroxy-2-naphthalenesulfonic acid.
By adopting the technical scheme, the main reason why the 7-amino-4-hydroxy-2-naphthalenesulfonic acid has the effect of delaying the hydration speed of the cement is that the molecular formula contains hydroxy and amino, the hydroxy and the amino are easy to associate with water molecules through hydrogen bonds, and the hydrogen bonds between the water molecules are associated, so that a stable solvated water film is formed on a cement particle film, the direct contact between cement particles is prevented, the hydration is hindered, the hydration speed of the cement is delayed, the variation of the concrete slump is reduced, and the high slump of the concrete is improved.
Preferably, the high slump retaining admixture further comprises 4-8 parts of a retarder.
By adopting the technical scheme, the retarder is added into the concrete raw material, so that the initial setting time of the concrete can be prolonged, the plasticity of the concrete can be kept for a long time according to requirements, the concrete can be normally used in a construction site, the hydration heat release rate is delayed, the temperature stress generated by concentrated heat release is reduced to cause concrete structure cracks, the variation of the concrete slump is reduced, and the high slump of the concrete is improved.
Preferably, the retarder is sodium gluconate.
By adopting the technical scheme, the sodium gluconate is added into the concrete to play a role in retarding coagulation, and molecules of the sodium gluconate contain functional groups with stronger polarity, such as hydroxyl groups, and the like, so that the functional groups are adsorbed on hydrate crystal nuclei to prevent the crystal nuclei from continuing to grow, mainly delay the crystallization conversion process of hydrate on calcium silicate and delay the generation of calcium hydroxide crystals from calcium carbonate, thereby retarding the initial setting of the concrete and improving the high slump of the concrete.
Preferably, the high slump retaining additive comprises 7-11 parts of air entraining agent.
Through adopting above-mentioned technical scheme, the doping of air-entraining agent makes the concrete mixture form a large amount of small closed form bubbles in, and these microbubbles like the ball, reduce the frictional resistance between the aggregate granule, make the mobility increase of fresh concrete, and air-entraining agent can prolong the initial set time of fresh concrete to reduce the slump loss of concrete, improve the high slump of concrete.
Preferably, the air entraining agent is sodium petroleum sulfonate.
By adopting the technical scheme, the sodium petroleum sulfonate is selected as the air entraining agent, so that the tension effect of a liquid-gas section can be reduced, the sodium petroleum sulfonate molecules contain sulfonic groups, the sulfonic groups can improve the dispersibility of the sodium petroleum sulfonate in concrete raw materials, the sodium petroleum sulfonate and the concrete are uniformly mixed, the flowability of the fresh concrete is increased, the effect of delaying the initial setting time of the concrete is better, and the high slump of the concrete is improved.
Preferably, the defoamer is polydimethylsiloxane.
By adopting the technical scheme, the sorbitol is used as the defoaming agent and can be used as the defoaming agent, so that a large amount of foam in the concrete in the stirring process is reduced, the foam is broken, the strength of the concrete is improved, and the compactness of the concrete is improved.
In a second aspect, the present application provides a method for preparing a high slump retaining admixture suitable for concrete, which adopts the following technical scheme:
a preparation method of a high slump retaining additive suitable for concrete comprises the following steps:
s1: and uniformly mixing and stirring the water-reducing mother liquor, the special slump retaining agent for machine-made sand, the defoaming agent, the preservative, water, the calcium ion complexing agent and the like to obtain the high slump retaining additive.
By adopting the technical scheme, the cement and the calcium ion complexing agent are fully mixed, water is added, the cement generates calcium ions when meeting water, the calcium ions and the calcium ion complexing agent are complexed, and the retarder can delay calcium hydroxide crystallization, so that the initial setting of the concrete is reduced, the mixing of the air entraining agent can improve the fluidity of the fresh concrete, the initial setting time of the fresh concrete is reduced, and the high slump retaining additive is obtained.
In summary, the present application has the following beneficial effects:
1. because the calcium ion complexing agent is adopted, the calcium ion complexing agent can react with calcium ions to form an unstable complex, the possibility of hydration reaction of the calcium ions in the cement clinker can be reduced, the concentration of the calcium ions in a liquid phase is controlled at the initial stage of the hydration reaction, and a delayed coagulation effect is generated;
2. the air entraining agent is preferably adopted in the application, a large amount of micro closed bubbles are formed in the concrete mixture due to the doping of the air entraining agent, the micro bubbles are like balls, the friction resistance among concrete particles is reduced, the flowability of the fresh concrete is increased, the initial setting time of the fresh concrete can be prolonged by the air entraining agent, and the effect of high slump of the concrete is obtained;
3. according to the method, the high slump loss resistant additive is obtained by uniformly mixing and stirring the water-reducing mother liquor, the special slump loss resistant agent for machine-made sand, the defoaming agent, the preservative, the water, the calcium ion complexing agent and the like, and then the high slump loss resistant additive is added into the concrete, so that the effect of high slump loss of the concrete is obtained.
Detailed Description
Source of raw materials
The water reducing agent mother liquor is a commercial product of Hebei Shengtong building materials science and technology limited company;
the special slump retaining agent for the machine-made sand is a commercially available product of Lishuixing building materials GmbH;
7-amino-4-hydroxy-2-naphthalenesulfonic acid is a commercially available product of Shanghai-derived PhylloBiotechnology Co., Ltd;
the sodium gluconate is a commercial product of Hebei Zhentian food additive Co., Ltd;
sodium petroleum sulfonate is a commercial product of Hangzhou Baisi chemical science and technology company;
sorbitol is a product sold in the market by Henan Huayue chemical products, Inc.;
benzoic acid is a commercially available product from Shandong Guo Shuo Biotech, Inc.
Example 1
The high slump retaining additive suitable for concrete is prepared by stirring and mixing the following raw materials in parts by weight:
35kg of water-reducing mother liquor,
45kg of special collapse preventing agent for machine-made sand,
25kg of defoaming agent, wherein the defoaming agent is sorbitol.
25kg of preservative, wherein the preservative is benzoic acid.
90kg of water is added into the reaction kettle,
25kg of calcium ion complexing agent, wherein the calcium ion complexing agent is 7-amino-4-hydroxy-2-naphthalenesulfonic acid.
6kg of retarder, wherein the retarder is sodium gluconate.
9kg of air entraining agent, wherein the air entraining agent is petroleum sodium sulfonate.
A preparation method of a high slump retaining additive suitable for concrete comprises the following steps:
s1: uniformly mixing the water-reducing mother liquor, the special collapse-preventing agent for machine-made sand, the defoaming agent, the preservative, water, the calcium ion complexing agent and the like, and stirring for 30 minutes to obtain the high-collapse-preventing additive.
According to the preparation method, the high slump retaining admixture suitable for concrete is produced, the using amount of the raw materials is changed to prepare examples 2-5, the other operation steps and parameters are the same as those of example 1, and the high slump retaining admixtures of examples 1-5 are obtained, wherein the specific using amounts of the examples 1-5 are shown in the following table 1.
The concrete is prepared by stirring and mixing the following raw materials in parts by weight: 85kg of cement, 40kg of fly ash, 30kg of sand and 100kg of water, and the five high slump retaining additives obtained in the above examples 1-5 are respectively mixed with concrete raw materials to obtain five high slump retaining concretes.
The high slump retaining concretes obtained in examples 1 to 5 were tested.
1. Initial setting and final setting time test: the determination method is carried out according to GB/T50080-2016 Standard test method for Performance of common concrete mixtures.
2. And (3) testing the compressive strength: the compressive strength of 7d and 28d, and the test method and the instrument are strictly executed according to GB/T50081-2019 common concrete mechanical property test method.
The test results are shown in the following table.
Table 2, initial set and final set times and compressive strength test results for examples 1-5.
As can be seen from the above table, the test results of example 1 are better than those of examples 2-5, and it can be seen from comparative example 1 and example 2 that although the high slump concrete has a higher strength at 7 days, the final 28 days of the high slump concrete has a lower strength than that of example 1, and it can be seen that the slump retaining admixture prepared in example 1 has a higher compressive strength and a longer initial setting time, so the high slump retaining admixture prepared in example 1 has a higher cost performance.
Example 6
Based on the embodiment 1, the calcium ion complexing agent is citric acid, and the other operation steps and parameters are the same as those in the embodiment 1.
Example 7
Based on the embodiment 1, the calcium ion complexing agent is ethylene diamine tetraacetic acid, and the rest operation steps and parameters are the same as those in the embodiment 1.
Example 8
Based on the concrete in example 1, no retarder is added into the concrete, and the rest of the operation steps and parameters are the same as those in example 1.
Example 9
Based on the concrete of example 1, the retarder is carboxyethyl cellulose, and the rest of the operation steps and parameters are the same as those of example 1.
Example 10
Based on the embodiment 1, the retarder is sodium pyrophosphate, and the other operation steps and parameters are the same as those in the embodiment 1.
Example 11
Based on the embodiment 1, the air entraining agent is not added into the high slump retaining admixture, and the rest operation steps and parameters are the same as those of the embodiment 1.
Example 12
Based on the concrete of example 1, the air entraining agent is rosin soap, and the rest of the operation steps and parameters are the same as those of example 1.
Example 13
Based on the embodiment 1, the air entraining agent is sulfonated alkyl succinate, and the rest operation steps and parameters are the same as those of the embodiment 1.
Example 14
Based on the embodiment 1, the high slump retaining additive for concrete is prepared by selecting trialkyl melamine as a defoaming agent, and the rest operation steps and parameters are the same as those in the embodiment 1.
Example 15
The high slump retaining additive for concrete is prepared based on example 1, and dimethyl silicone polymer as defoaming agent and through the same technological steps and parameters as in example 1.
Comparative example 1
Based on the embodiment 1, the high slump retaining admixture is not added with a calcium ion complexing agent, and the rest operation steps and parameters are the same as those of the embodiment 1.
The high slump retaining concretes obtained in examples 6 to 15 and comparative example 1 were tested, and the test results are shown in the following table.
Table 3, initial set and final set times and compressive strength test results for examples 6-15 and comparative example 1.
As can be seen from the above table, the test results of example 1 are significantly better than those of examples 6-11 and comparative example 1.
It can be seen from comparison of examples 1 and 6 that when citric acid is used as the calcium ion complexing agent, the initial setting time and the final setting time of the concrete are both short, and the strength of the obtained concrete is low, and comparison of example 7 can obtain that when ethylene diamine tetraacetic acid is used as the calcium ion complexing agent, the initial setting time and the final setting time of the obtained concrete are not greatly different, but the initial setting time is still short, so that only when 7-amino-4-hydroxy-2-naphthalenesulfonic acid is used as the calcium ion complexing agent, the initial setting time of the prepared concrete is longest, and the compressive strength is strongest.
Comparing example 1 with example 8, it can be seen that when no retarder is added to the concrete, the initial setting time of the concrete is shorter and the compressive strength is lower, so that the addition of the retarder not only can prolong the initial setting time of the concrete, but also can improve the compressive strength of the concrete.
It can be seen from comparison between example 1 and example 9 that, when the retarder is selected from carboxyethyl cellulose, the initial setting time of the concrete is short, but when the retarder is selected from carboxyethyl cellulose, the influence on the compressive strength is small, and as can be seen from comparison between example 10, when the retarder is selected from sodium pyrophosphate, the initial setting time of the concrete is not greatly different, but the later compressive strength is small, so that the initial setting time of the concrete can be prolonged by selecting sodium gluconate as the retarder, the slump loss of the concrete is reduced, and the high slump retention of the concrete is improved.
Comparing example 1 with example 11, it can be seen that, when the air entraining agent is not added into the concrete, the initial setting time of the concrete is shorter, and the compressive strength of the concrete is smaller, so that the addition of the air entraining agent can not only improve the compressive strength of the concrete, but also increase the initial setting time of the concrete and improve the high slump retaining property of the concrete.
It can be seen from comparison of examples 1 and 12 that when the air entraining agent is rosin soap, the compressive strength of the concrete is low, but the initial setting time is not very different from that of example 1, and comparison of example 13 shows that when the air entraining agent is sulfonated alkyl succinate, the initial setting time and compressive strength of the concrete are slightly lower than those of the concrete prepared when the air entraining agent is sodium petroleum sulfonate, so that the high slump retention of the concrete can be improved when the sodium petroleum sulfonate is added.
It can be seen from comparison between example 1 and example 14 that when the trialkyl melamine is used as the defoaming agent, the hydration of the cement is large, and the initial setting time of the concrete is short, and comparison between example 15 shows that when the polydimethylsiloxane is used as the defoaming agent, the initial setting time of the concrete is slightly lower than that of example 1, but the compressive strength of the concrete is low, so when the sorbitol is used as the defoaming agent, the initial setting time of the prepared concrete is long, the compressive strength of the prepared concrete is maximum, and the high slump retaining effect of the prepared concrete is better.
It can be seen from the comparison between example 1 and comparative example 1 that, when the calcium ion complexing agent is not added into the concrete, the initial setting time of the concrete is short, and the compressive strength is low, so that the addition of the calcium ion complexing agent not only affects the initial setting time of the concrete, but also can improve the compressive strength of the concrete, thereby improving the high slump retention of the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The high slump retaining additive suitable for concrete is characterized in that: the material is prepared by stirring and mixing the following raw materials in parts by weight:
30-80 parts of water-reducing mother liquor,
60-90 parts of special collapse-preventing agent for machine-made sand,
20-30 parts of a defoaming agent,
20-30 parts of a preservative agent,
80-100 parts of water, namely,
20-30 parts of calcium ion complexing agent.
2. The high slump loss resistant additive suitable for concrete according to claim 1, wherein: the calcium ion complexing agent is 7-amino-4-hydroxy-2-naphthalenesulfonic acid.
3. The high slump loss resistant additive suitable for concrete according to claim 1, wherein: the high slump loss resistant additive also comprises 4-8 parts of retarder.
4. The high slump loss resistant additive suitable for concrete according to claim 3, wherein: the retarder is sodium gluconate.
5. The high slump loss resistant additive suitable for concrete according to claim 1, wherein: the high slump loss resistant additive also comprises 7-11 parts of an air entraining agent.
6. The high slump loss resistant additive suitable for concrete according to claim 5, wherein: the air entraining agent is petroleum sodium sulfonate.
7. The high slump loss resistant additive suitable for concrete according to claim 1, wherein: the defoaming agent is sorbitol.
8. The method for preparing a high slump retaining additive suitable for concrete according to any one of claims 1 to 7, wherein: the method comprises the following steps:
s1: and uniformly mixing and stirring the water-reducing mother liquor, the special slump retaining agent for machine-made sand, the defoaming agent, the preservative, water, the calcium ion complexing agent and the like to obtain the high slump retaining additive.
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