阅读说明：本技术 一种改善混凝土外观的外加剂 (Additive for improving appearance of concrete ) 是由 韩红良 沈国兴 蔡良 梅海梁 于 2020-06-16 设计创作，主要内容包括：本发明涉及一种具有改善混凝土外观的外加剂,按照质量百分比计,该外加剂由10.0～50.0％的聚羧酸减水剂、不大于10.0％的缓凝剂质量、0.05～0.3％的消泡剂、不大于0.5％的引气剂、1～10％的碱<Image he="58" wi="49" file="DDA0002541728450000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>制剂以及余量的水组成,本发明的外加剂与普通的外加剂相比,在拥有优异的减水率、抗压强度比等新拌混凝土性能外,还具有改善硬化混凝土外观的效果,可用于具有较高外观要求的各类混凝土中。(The invention relates to an additive for improving the appearance of concrete, which comprises, by mass, 10.0-50.0% of a polycarboxylic acid water reducing agent, not more than 10.0% of a retarder, 0.05-0.3% of a defoaming agent, not more than 0.5% of an air entraining agent and 1-10% of alkali Compared with the common admixture, the admixture of the invention has the advantages of excellent water reducing rate, compression strength ratio and other properties of fresh concrete, and also has the effect of improving the appearance of hardened concrete, and can be used in various types of concrete with higher appearance requirements.)

1. The additive for improving the appearance of concrete is characterized by comprising, by mass, 10.0-50.0% of a polycarboxylic acid water reducing agent, not more than 10.0% of a retarder, 0.05-0.3% of a defoaming agent, not more than 0.5% of an air entraining agent, 1-10% of an alkali inhibitor and the balance of water.

2. The admixture for improving the appearance of concrete as claimed in claim 1, wherein said polycarboxylic acid water reducing agent is a lipid polycarboxylic acid water reducing agent.

3. The admixture for improving the appearance of concrete as claimed in claim 2, wherein the lipid-based polycarboxylic acid water reducing agent is a copolymer of polyethylene glycol (meth) acrylate and sodium (meth) acrylate sulfonate.

4. The admixture for improving the appearance of concrete according to claim 2, wherein the retarder is one or a mixture of industrial grade sodium gluconate and white sugar.

5. The admixture for improving the appearance of concrete according to claim 1, wherein the defoaming agent used is a polyether-based defoaming agent.

6. The admixture for improving the appearance of concrete according to claim 1, wherein the air-entraining agent used is a rosin thermopolymer type air-entraining agent.

7. The admixture for improving the appearance of concrete according to claim 1 wherein the alkali inhibitor used is lithium carbonate.

8. The method for preparing the admixture according to any one of claims 1 to 7, comprising the steps of: respectively putting water, a polycarboxylic acid water reducing agent, a retarder, a defoaming agent, an air entraining agent and an alkali inhibitor into a container, adding while stirring, putting all the materials into the container, and stirring uniformly to obtain the water-based paint.

Technical Field

The invention relates to a composite admixture capable of effectively improving the appearance quality of concrete by selecting raw materials and adjusting the proportion in an admixture for improving the appearance of concrete, belonging to the field of concrete admixtures.

Background

In recent years, a great deal of engineering is built in China, concrete is applied in a great deal, a great deal of problems appear in concrete application, the most visual and obvious concrete appearance is, and common concrete defects include the phenomena of holes, pitted surfaces, sand lines, waterlines, whitening of the concrete surface, chromatic aberration, cracks and the like.

The great use of concrete greatly promotes the progress of concrete technology, the concrete technology is gradually functionalized, and with the appearance of unmodified concrete such as decorative concrete, fair-faced concrete, bridge pier columns, beam bodies, prefabricated parts and the like, higher requirements are provided for the appearance of the concrete.

Factors influencing the appearance quality of concrete are many and complex, for example, the appearance quality of concrete is influenced by changes of raw materials of concrete, the rationality of the mixing proportion of concrete, a construction method and environmental factors, the appearance quality of concrete is not easy to control, the appearance quality problem is solved by a large amount of manpower and material resources for repairing, and the concrete is seriously even required to be rebuilt, so that a large amount of waste is caused.

For the additive for improving the appearance of concrete, the concrete appearance is mainly improved at home and abroad by reducing the content of concrete bubbles, improving the workability of concrete, improving the stability of concrete and improving the concrete appearance through concrete shrinkage, and a patent CN 106746839A discloses a polycarboxylic acid series high-performance water reducing agent composition and application thereof. The above patent does not pay attention to the characteristic that the concrete generates color difference due to white substances generated by surface efflorescence. The appearance of concrete has many factors, such as air bubbles, concrete uniformity and concrete workability, and white substances generated by calcium carbonate generated after alkali in the concrete spreads on the surface of the concrete and contacts with air, and no special additive is developed for improving the characteristics.

Disclosure of Invention

The invention aims to provide an additive for improving the appearance of concrete, which comprises, by mass, 10.0-50.0% of a polycarboxylic acid water reducing agent, not more than 10.0% of a retarder, 0.05-0.3% of a defoaming agent, not more than 0.5% of an air entraining agent and 1-10% of alkaliThe preparation and the balance of water.

Preferably, the polycarboxylate water reducer is a lipid polycarboxylate water reducer.

Preferably, the lipid polycarboxylate superplasticizer is a copolymer of polyethylene glycol (meth) acrylate and sodium (meth) acrylate sulfonate;

preferably, the retarder is one or a mixture of industrial sodium gluconate and white sugar.

Preferably, the defoaming agent used is a polyether defoaming agent.

Preferably, the air-entraining agent used is a rosin thermopolymer-based air-entraining agent.

Preferably, a base is used

The formulation is lithium carbonate.

Another object of the present invention is to provide a method for preparing the admixture according to any one of claims 1 to 7, which comprises the steps of: water, polycarboxylic acid water reducing agent, retarder, defoaming agent, air entraining agent and alkali

Adding the preparation into containers respectively while stirring, adding all the materials, and stirring.

The admixture for improving the appearance of the concrete, prepared by the invention, has excellent water reducing rate performance and compressive strength increase rate, has no defects of bubbles, waterline, color difference and the like on the surface of hardened concrete, has no phenomena of efflorescence and whitening on the upper surface, and has better appearance quality.

Detailed Description

The lipid polycarboxylate superplasticizer below refers to a copolymer of polyethylene glycol (meth) acrylate and sodium (meth) acrylate sulfonate.