CN111943556A - Concrete accelerator - Google Patents
Concrete accelerator Download PDFInfo
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- CN111943556A CN111943556A CN202010827953.0A CN202010827953A CN111943556A CN 111943556 A CN111943556 A CN 111943556A CN 202010827953 A CN202010827953 A CN 202010827953A CN 111943556 A CN111943556 A CN 111943556A
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- concrete
- accelerator
- hydration
- complexing agent
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Classifications
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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
- 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
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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
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete admixtures, and discloses a concrete accelerator which is composed of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 1-5 parts of aluminum sulfate, 15-30 parts of copper sulfate, 2-4 parts of copper sulfate, 3-5 parts of hydration accelerator, 0.5-1 part of polyvinyl alcohol, 0.5-5 parts of titanium potassium oxalate, 1-5 parts of pH value regulator, 1-5 parts of complexing agent and 40-60 parts of water. The product of the invention has no alkali and chlorine, does not harm human body, does not corrode reinforcing steel bars, and can remarkably promote cement hydration and concrete strength improvement.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete accelerator.
Background
The accelerator is a chemical additive for quickly setting and hardening concrete, is an essential key material in concrete spraying construction, is widely applied to engineering construction such as tunnel support, mine reinforcement, road first-aid repair, waterproof plugging and the like, and plays an important role in the national infrastructure construction industry. The quick-setting admixture is divided into two types of powder quick-setting admixture and liquid quick-setting admixture, the powder quick-setting admixture is mainly used for dry-process sprayed concrete, the dry spraying has the defects of large dust, uneven doping, high resilience and the like, and the powder quick-setting admixture is abandoned in tunnel engineering construction gradually. The liquid accelerator is mainly used for wet sprayed concrete, has the advantages of better construction environment, low rebound rate of sprayed concrete, high construction quality and the like compared with a wet spraying process of a dry spraying process, and is more and more important due to the improvement of engineering durability indexes, environmental protection and other requirements.
At present, alkaline liquid setting accelerators are mostly used in China, and the main components of the alkaline liquid setting accelerators are sodium aluminate, sodium silicate and the like. Although the concrete can meet the requirements of concrete construction, the concrete has the huge defects, such as the total alkali content of the concrete is more than 10%, the pH value is 12-14, the concrete belongs to a strong alkaline substance, and the concrete has strong corrosivity to human bodies. In the using process, the rebound quantity is large, the sprayed strong alkaline substance causes strong damage to the skin and eyes of constructors, the high alkali content is extremely unfavorable for the strength and durability of concrete, and the engineering quality is difficult to guarantee.
Disclosure of Invention
The invention aims at the problems and provides a concrete accelerator which does not influence the later strength development of concrete and the durability of the concrete. In order to achieve the purpose, the invention adopts the following technical scheme. The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 1-5 parts of aluminum sulfate, 15-30 parts of copper sulfate, 2-4 parts of copper sulfate, 3-5 parts of hydration accelerator, 0.5-1 part of polyvinyl alcohol, 0.5-5 parts of titanium potassium oxalate, 1-5 parts of pH value regulator, 1-5 parts of complexing agent and 40-60 parts of water.
The hydration promoter is one of calcium acetate and dihydroxyethyl glycine.
Preferably, the hydration promoter is dihydroxyethylglycine.
Preferably, the molecular weight of the polyvinyl alcohol is 8000-.
Preferably, the pH regulator is one of dilute sulfuric acid and boric acid.
The complexing agent is one of sodium aminotriacetate and ethylene diamine tetramethylene sodium phosphate.
In the invention, the tetraethylene glycol monomethyl ether can effectively reduce the surface tension of a system, not only can enable the additive to have better fluidity, but also can increase the plasticity of the concrete, and has no influence on other properties of the concrete; copper sulfate can form copper hydroxide crystal nucleus after contacting with cement, reduce C-S-H nucleation barrier and promote C3S, hydrating to accelerate the cement setting; the complexing agent can be reacted with Al3+Form soluble complex and reduce Al3+Concentration, decrease of Al (OH)3Precipitating; surprisingly, the inventor finds that the potassium titanium oxalate and the aluminum salt are synergistic, and can play a role in nucleating and crystallizing, so that the hydration induction period of the cement is shortened, the auxiliary coagulation promoting effect is realized, and the early and later strength can be improved; the inventor also finds that the proper amount of dihydroxyethylglycine promotes the development of early strength, and after 3-5 parts of dihydroxyethylglycine is added into the system, the 3d strength of the concrete is obviously increased, the reinforcing effect is poor below the range, and the strength is higher than the rangeThe trend is reduced; the pH regulator is added to reduce the pH of the system and inhibit the hydrolysis of aluminum salt; polyvinyl alcohol molecules are mutually connected and adsorb two or more cement particles, so that the bridging effect is achieved, the slurry is favorable for forming a remote condensation structure, the concrete has certain viscosity, and the resilience is reduced.
Advantageous effects of the invention
(1) The product of the invention has no alkali and chlorine, does not harm human body, does not corrode reinforcing steel bars, and can remarkably promote cement hydration and concrete strength improvement;
(2) the product of the invention has good stability and can be stored and transported for a long time.
Detailed Description
Example 1
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 1 part, 30 parts of aluminum sulfate, 2 parts of copper sulfate, 5 parts of hydration accelerator, 0.5 part of polyvinyl alcohol, 5 parts of titanium potassium oxalate, 1 part of pH value regulator, 5 parts of complexing agent and 40 parts of water.
The hydration promoter is calcium acetate.
The pH value regulator is dilute sulfuric acid.
The complexing agent is sodium aminotriacetate.
Example 2
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 5 parts of aluminum sulfate, 15 parts of copper sulfate, 4 parts of copper sulfate, 3 parts of hydration accelerator, 1 part of polyvinyl alcohol, 0.5 part of potassium titanium oxalate, 5 parts of pH value regulator, 1 part of complexing agent and 60 parts of water.
The hydration accelerator is dihydroxyethyl glycine.
The polyvinyl alcohol is a 04-99 (L) type product of Anhui vitamin.
The pH value regulator is boric acid.
The complexing agent is ethylene diamine tetra methylene sodium phosphate.
Example 3
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 3 parts of aluminum sulfate, 23 parts of copper sulfate, 3 parts of hydration accelerator, 4 parts of polyvinyl alcohol, 0.8 part of titanium potassium oxalate, 4 parts of pH value regulator, 3 parts of complexing agent and 52 parts of water.
The hydration accelerator is dihydroxyethyl glycine.
The molecular weight of the polyvinyl alcohol is 8000-20000.
The pH value regulator is sulfuric acid with the concentration of 20% by mass fraction.
The complexing agent is ethylene diamine tetra methylene sodium phosphate.
Example 4
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 2 parts of aluminum sulfate, 25 parts of copper sulfate, 2.5 parts of copper sulfate, 4.2 parts of hydration accelerator, 0.7 part of polyvinyl alcohol, 4 parts of potassium titanium oxalate, 3 parts of pH value regulator, 4 parts of complexing agent and 49 parts of water.
The hydration promoter is calcium acetate.
The pH value regulator is boric acid.
The complexing agent is sodium aminotriacetate.
Example 5
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 4 parts of aluminum sulfate 22 parts, 3 parts of copper sulfate, 3.5 parts of hydration accelerator, 0.9 part of polyvinyl alcohol, 4.2 parts of potassium titanium oxalate, 3.8 parts of pH value regulator, 1.5 parts of complexing agent and 55 parts of water.
Comparative example 1
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 3 parts of aluminum sulfate, 23 parts of hydration accelerator, 4 parts of polyvinyl alcohol, 2.7 parts of titanium potassium oxalate, 4 parts of pH value regulator, 3 parts of complexing agent and 52 parts of water.
The hydration accelerator is dihydroxyethyl glycine.
The molecular weight of the polyvinyl alcohol is 8000-20000.
The pH value regulator is sulfuric acid with the concentration of 20% by mass fraction.
The complexing agent is ethylene diamine tetra methylene sodium phosphate.
Comparative example 2
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 2 parts of aluminum sulfate, 25 parts of copper sulfate, 2.5 parts of copper sulfate, 4.2 parts of hydration accelerator, 0.7 part of polyvinyl alcohol, 3 parts of pH value regulator, 4 parts of complexing agent and 49 parts of water.
The hydration promoter is calcium acetate.
The pH value regulator is boric acid.
The complexing agent is sodium aminotriacetate.
Comparative example 3
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 3 parts of aluminum sulfate, 23 parts of copper sulfate, 3 parts of hydration accelerator, 4 parts of polyvinyl alcohol, 0.8 part of titanium potassium oxalate, 4 parts of pH value regulator, 3 parts of complexing agent and 52 parts of water.
The hydration accelerator is triethanolamine.
The molecular weight of the polyvinyl alcohol is 8000-20000.
The pH value regulator is sulfuric acid with the concentration of 20% by mass fraction.
The complexing agent is ethylene diamine tetra methylene sodium phosphate.
Comparative example 4
The concrete accelerator consists of the following substances in parts by weight: tetraethylene glycol monomethyl ether: 2 parts of aluminum sulfate, 25 parts of copper sulfate, 2.5 parts of copper sulfate, 4.2 parts of hydration accelerator, 0.7 part of polyvinyl alcohol, 4 parts of potassium titanium oxalate, 3 parts of pH value regulator and 49 parts of water.
The hydration promoter is calcium acetate.
The pH value regulator is boric acid.
The concrete setting accelerators obtained in examples 1 to 5 and comparative examples 1 to 4 were subjected to determination of net slurry setting time and mortar compressive strength with reference to GB/T35159-2017 accelerating agent for sprayed concrete, wherein the stability test method comprises the following steps: the liquid accelerator was poured into a 100ml measuring cylinder with a plug, and after standing for 28 days at 20. + -. 2 ℃ the bottom sediment volume was measured. The results are shown in Table 1 below.
Table 1 results of performance testing
Claims (7)
1. The concrete accelerator is characterized by comprising the following components in parts by weight: tetraethylene glycol monomethyl ether: 1-5 parts of aluminum sulfate, 15-30 parts of copper sulfate, 2-4 parts of copper sulfate, 3-5 parts of hydration accelerator, 0.5-1 part of polyvinyl alcohol, 0.5-5 parts of titanium potassium oxalate, 1-5 parts of pH value regulator, 1-5 parts of complexing agent and 40-60 parts of water.
2. The concrete accelerator according to claim 1, wherein the hydration accelerator is one of calcium acetate and dihydroxyethyl glycine.
3. The concrete accelerator according to claim 2, wherein the hydration accelerator is dihydroxyethylglycine.
4. The concrete accelerator according to claim 1, wherein the molecular weight of the polyvinyl alcohol is 8000-.
5. The concrete accelerator according to claim 1, wherein the pH regulator is one of dilute sulfuric acid and boric acid.
6. The concrete accelerator according to claim 5, wherein the pH adjuster is boric acid.
7. The concrete accelerator according to claim 1, wherein the complexing agent is one of sodium aminotriacetate and sodium ethylene diamine tetramethylidene phosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010827953.0A CN111943556A (en) | 2020-08-18 | 2020-08-18 | Concrete accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010827953.0A CN111943556A (en) | 2020-08-18 | 2020-08-18 | Concrete accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111943556A true CN111943556A (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010827953.0A Withdrawn CN111943556A (en) | 2020-08-18 | 2020-08-18 | Concrete accelerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112661424A (en) * | 2020-12-31 | 2021-04-16 | 安徽海螺新材料科技有限公司 | Environment-friendly cement and preparation method thereof |
-
2020
- 2020-08-18 CN CN202010827953.0A patent/CN111943556A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112661424A (en) * | 2020-12-31 | 2021-04-16 | 安徽海螺新材料科技有限公司 | Environment-friendly cement and preparation method thereof |
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Application publication date: 20201117 |