阅读说明：本技术 一种硫铝酸盐水泥混凝土外加剂 (Sulphoaluminate cement concrete additive ) 是由 兰栋 康少冉 王雅 李海宏 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种硫铝酸盐水泥混凝土外加剂,涉及混凝土技术领域,按质量份计,所述硫铝酸盐水泥混凝土外加剂包括：减水型聚羧酸减水剂150-250份,保坍型聚羧酸减水剂0-100份,硼酸100-350份,葡糖糖酸钠5-30份,引气剂0.1-0.5份。本发明的优势在于：(1)本发明可有效提高硫铝酸盐水泥混凝的和易性好,降低混凝土1h、2h坍落度损失,增长混凝土的可施工时间；(2)本发明的硫铝酸盐水泥混凝土外加剂的制备过程简单,操作简洁,工艺合理,有利于工业化生产；(3)本发明的硫铝酸盐水泥混凝土外加剂为环境友好型材料,对人体和环境无污染。(The invention discloses a sulphoaluminate cement concrete admixture, which relates to the technical field of concrete, and comprises the following components in parts by mass: 150-250 parts of water-reducing polycarboxylic acid water reducing agent, 0-100 parts of slump-retaining polycarboxylic acid water reducing agent, 350 parts of boric acid, 5-30 parts of sodium gluconate and 0.1-0.5 part of air entraining agent. The invention has the advantages that: (1) the invention can effectively improve the workability of the sulphoaluminate cement, reduce the slump loss of the concrete for 1h and 2h and prolong the construction time of the concrete; (2) the preparation process of the sulphoaluminate cement concrete admixture is simple, the operation is simple, the process is reasonable, and the industrial production is facilitated; (3) the sulphoaluminate cement concrete admixture is an environment-friendly material and has no pollution to human bodies and the environment.)

1. The sulphoaluminate cement concrete admixture comprises the following components in parts by mass: 150-250 parts of water-reducing polycarboxylic acid water reducing agent, 0-100 parts of slump-retaining polycarboxylic acid water reducing agent, 350 parts of boric acid, 5-30 parts of sodium gluconate and 0.1-0.5 part of air entraining agent.

2. The admixture of claim 1, wherein preferably the air entraining agent comprises any one or any combination of: triterpenoid saponin, sodium dodecyl sulfate, sodium aliphatic polyoxyethylene ether sulfate and sodium alpha-olefin sulfate.

3. The admixture according to claim 1, wherein the preparation method of the water reducing type polycarboxylate water reducing agent comprises the steps of:

s100, preparing acrylic monomer solution;

s200, preparing an initiator solution;

s300, preparing the water-reducing polycarboxylate superplasticizer.

4. The admixture of claim 3, wherein step S100 further comprises:

dissolving 360 parts by mass of 330-doped isopentenol polyoxyethylene ether, 1.5-3 parts by mass of hydrogen peroxide solution and 35-50 parts by mass of acrylic acid in deionized water in sequence to prepare acrylic acid monomer solution.

5. The admixture of claim 3, wherein step S200 further comprises: dissolving 0.2-0.6 part by mass of ascorbic acid and 1-2 parts by mass of thioglycolic acid in deionized water to prepare an initiator solution.

6. The admixture of claim 3, wherein step S300 further comprises: dripping acrylic acid monomer solution and initiator solution into the reaction kettle, dripping acrylic acid monomer solution for 1.5-3h, and dripping initiator solution for 2-3.5 h; and (3) continuing to react for 1h after the dripping is finished, and adjusting the pH of the reaction product to 6 by using a 30% sodium hydroxide solution to obtain the product, namely the water-reducing polycarboxylic acid water reducer.

7. The admixture of claim 1, wherein the preparation method of the slump-retaining type polycarboxylic acid water reducing agent comprises the following steps:

s101, preparing an acrylic monomer solution;

s201, preparing an initiator solution;

s301, preparing the slump-retaining type polycarboxylate superplasticizer.

8. The admixture of claim 7, wherein step S100 further comprises: dissolving 300-360 parts by mass of isopentenol polyoxyethylene ether in ionized water, stirring and dissolving, adding 1.5-6 parts by mass of hydrogen peroxide solution into a reaction kettle, and dissolving 15-30 parts by mass of acrylic acid and 25-45 parts by mass of hydroxyethyl acrylate in deionized water to prepare an unsaturated monomer solution.

9. The admixture of claim 7, wherein step S200 further comprises: dissolving 0.4-0.8 part by mass of ascorbic acid and 1-2 parts by mass of thioglycolic acid in deionized water to prepare an initiator solution.

10. The admixture of claim 7, wherein step S300 further comprises: dripping acrylic acid monomer solution and initiator solution into the reaction kettle, dripping acrylic acid monomer solution for 2-3h, and dripping initiator solution for 2.5-3.5 h; and (3) continuing to react for 1h after the dripping is finished, and adjusting the pH value of the reaction product to 6 by using a 30% sodium hydroxide solution to obtain the final product slump-retaining type polycarboxylate superplasticizer.

11. A preparation method of a water-reducing polycarboxylate superplasticizer comprises the following steps:

s100, preparing acrylic monomer solution;

s200, preparing an initiator solution;

s300, preparing the water-reducing polycarboxylate superplasticizer.

12. The preparation method of claim 11, wherein the step S100 further comprises:

dissolving 360 parts by mass of 330-doped isopentenol polyoxyethylene ether, 1.5-3 parts by mass of hydrogen peroxide solution and 35-50 parts by mass of acrylic acid in deionized water in sequence to prepare acrylic acid monomer solution.

13. The method of claim 11, wherein the step S200 further comprises: dissolving 0.2-0.6 part by mass of ascorbic acid and 1-2 parts by mass of thioglycolic acid in deionized water to prepare an initiator solution.

14. The method of claim 11, wherein the step S300 further comprises: dripping acrylic acid monomer solution and initiator solution into the reaction kettle, dripping acrylic acid monomer solution for 1.5-3h, and dripping initiator solution for 2-3.5 h; and (3) continuing to react for 1h after the dripping is finished, and adjusting the pH of the reaction product to 6 by using a 30% sodium hydroxide solution to obtain the product, namely the water-reducing polycarboxylic acid water reducer.

15. A preparation method of a slump-retaining type polycarboxylate water reducer comprises the following steps:

s101, preparing an acrylic monomer solution;

s201, preparing an initiator solution;

s301, preparing the slump-retaining type polycarboxylate superplasticizer.

16. The method of claim 15, wherein the step S100 further comprises: dissolving 300-360 parts by mass of isopentenol polyoxyethylene ether in ionized water, stirring and dissolving, adding 1.5-6 parts by mass of hydrogen peroxide solution into a reaction kettle, and dissolving 15-30 parts by mass of acrylic acid and 25-45 parts by mass of hydroxyethyl acrylate in deionized water to prepare an unsaturated monomer solution.

17. The method of claim 15, wherein the step S200 further comprises: dissolving 0.4-0.8 part by mass of ascorbic acid and 1-2 parts by mass of thioglycolic acid in deionized water to prepare an initiator solution.

18. The method of claim 15, wherein the step S300 further comprises: dripping acrylic acid monomer solution and initiator solution into the reaction kettle, dripping acrylic acid monomer solution for 2-3h, and dripping initiator solution for 2.5-3.5 h; and (3) continuing to react for 1h after the dripping is finished, and adjusting the pH value of the reaction product to 6 by using a 30% sodium hydroxide solution to obtain the final product slump-retaining type polycarboxylate superplasticizer.

Technical Field

The invention relates to the technical field of concrete, in particular to a sulphoaluminate cement concrete admixture.

Background

The sulphoaluminate cement has the characteristics of early strength, high strength, good freezing resistance, impermeability, great seawater corrosion resistance and the like, is widely applied to rush repair and rush construction projects, prefabricated parts, GRC products, low-temperature construction projects, seawater corrosion resistance projects and the like, but has extremely short construction time due to the characteristics of quick setting and hardening, which is an important obstacle for restricting the popularization and the application of the sulphoaluminate cement.

Therefore, the technical personnel in the field are dedicated to developing the additive special for the sulphoaluminate cement concrete, so that the construction time of the sulphoaluminate cement is ensured, and the quick setting and quick hardening characteristics of the sulphoaluminate cement are not influenced, which is an important measure for widely popularizing and applying the sulphoaluminate cement.

Disclosure of Invention

In view of the above defects in the prior art, the invention provides the additive special for the sulphoaluminate cement concrete, so that the constructable time of the sulphoaluminate cement is ensured, and the quick setting and hardening characteristics of the sulphoaluminate cement are not influenced, which is an important measure for widely popularizing and applying the sulphoaluminate cement.

In order to achieve the purpose, the invention provides a special additive for sulphoaluminate cement concrete, which comprises the following components in parts by mass: 150-250 parts of water-reducing polycarboxylic acid water reducing agent, 0-100 parts of slump-retaining polycarboxylic acid water reducing agent, 350 parts of boric acid, 5-30 parts of sodium gluconate and 0.1-0.5 part of air entraining agent.

The invention also provides a preparation method of the water-reducing polycarboxylate superplasticizer, which comprises the following steps:

s100, preparing acrylic monomer solution;

s200, preparing an initiator solution;

s300, preparing the water-reducing polycarboxylate superplasticizer.

The invention also provides a preparation method of the slump-retaining type polycarboxylate superplasticizer, which comprises the following steps:

s101, preparing an acrylic monomer solution;

s201, preparing an initiator solution;

s301, preparing the slump-retaining type polycarboxylate superplasticizer.

Compared with the prior art, the sulphoaluminate cement concrete admixture has the advantages that:

(1) the invention can effectively improve the workability of the sulphoaluminate cement, reduce the slump loss of the concrete for 1h and 2h and prolong the construction time of the concrete;

(2) the preparation process of the sulphoaluminate cement concrete admixture is simple, the operation is simple, the process is reasonable, the industrial production is facilitated, the raw materials do not contain polyoxyethylene macromonomer, and the production cost is low;

(3) the sulphoaluminate cement concrete admixture is an environment-friendly material and has no pollution to human bodies and the environment.

Detailed Description

The invention provides a special additive for sulphoaluminate cement concrete, which comprises the following components in parts by mass: 150-250 parts of water-reducing polycarboxylic acid water reducing agent, 0-100 parts of slump-retaining polycarboxylic acid water reducing agent, 350 parts of boric acid, 5-30 parts of sodium gluconate and 0.1-0.5 part of air entraining agent.

On one hand, the invention can effectively improve the workability of the sulphoaluminate cement concrete, reduce the slump loss of the concrete for 1h and 2h and prolong the construction time of the concrete;

on the other hand, the sulphoaluminate cement concrete admixture is an environment-friendly material and has no pollution to human bodies and the environment.

In a preferred embodiment, the air entraining agent comprises any one or any combination of the following: triterpenoid saponin, sodium dodecyl sulfate, sodium aliphatic polyoxyethylene ether sulfate and sodium alpha-olefin sulfate.

The invention also provides a preparation method of the water-reducing polycarboxylate superplasticizer, which comprises the following steps:

s100, preparing acrylic monomer solution;

s200, preparing an initiator solution;

s300, preparing the water-reducing polycarboxylate superplasticizer.

In a preferred embodiment, step S100 further includes:

dissolving 360 parts by mass of 330-doped isopentenol polyoxyethylene ether, 1.5-3 parts by mass of hydrogen peroxide solution and 35-50 parts by mass of acrylic acid in deionized water in sequence to prepare acrylic acid monomer solution.

In a preferred embodiment, step S200 further includes: dissolving 0.2-0.6 part by mass of ascorbic acid and 1-2 parts by mass of thioglycolic acid in deionized water to prepare an initiator solution.

In a preferred embodiment, step S300 further includes: dripping acrylic acid monomer solution and initiator solution into the reaction kettle, dripping acrylic acid monomer solution for 1.5-3h, and dripping initiator solution for 2-3.5 h; and (3) continuing to react for 1h after the dripping is finished, and adjusting the pH of the reaction product to 6 by using a 30% sodium hydroxide solution to obtain the product, namely the water-reducing polycarboxylic acid water reducer.

The invention also provides a preparation method of the slump-retaining type polycarboxylate superplasticizer, which comprises the following steps:

s101, preparing an acrylic monomer solution;

s201, preparing an initiator solution;

s301, preparing the slump-retaining type polycarboxylate superplasticizer.

In a preferred embodiment, step S100 further includes: 300-360 parts by mass of isopentenol polyoxyethylene ether, 1.5-6 parts by mass of hydrogen peroxide solution, 15-30 parts by mass of acrylic acid and 25-45 parts by mass of hydroxyethyl acrylate are dissolved in deionized water, and the acrylic acid monomer solution is prepared by stirring and dissolving.

In a preferred embodiment, step S200 further includes: dissolving 0.4-0.8 part by mass of ascorbic acid and 1-2 parts by mass of thioglycolic acid in deionized water to prepare an initiator solution.

In a preferred embodiment, step S300 further includes: dripping acrylic acid monomer solution and initiator solution into the reaction kettle, dripping acrylic acid monomer solution for 2-3h, and dripping initiator solution for 2.5-3.5 h; and (3) continuing to react for 1h after the dripping is finished, and adjusting the pH value of the reaction product to 6 by using a 30% sodium hydroxide solution to obtain the final product slump-retaining type polycarboxylate superplasticizer.

In a preferred embodiment, the sulphoaluminate cement concrete admixture of the present invention is prepared by the following method:

150-100 parts by mass of a water-reducing polycarboxylic acid water reducing agent, 0-100 parts by mass of a slump-retaining polycarboxylic acid water reducing agent, 100-350 parts by mass of boric acid, 5-30 parts by mass of sodium gluconate and 0.1-0.5 part by mass of an air entraining agent are mixed at one time, and then water is added into the mixture to be uniformly stirred, so that the sulphoaluminate cement concrete admixture is prepared.

Various preferred embodiments of the present invention will be described below with reference to the specification so that the technical contents thereof will be more clearly and easily understood. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.