Special additive for machine-made sand plastering mortar and preparation method thereof

Abstract

The invention relates to the field of buildings, and particularly discloses a special additive for machine-made sand plastering mortar and a preparation method of the special additive. The admixture is prepared from the following raw materials in parts by weight: 12-20 parts of cellulose ether, 1-5 parts of starch ether, 7-12 parts of a water reducing agent, 5-11 parts of a thickening agent, 2-10 parts of an air entraining agent, 1-4 parts of magnesium aluminum silicate, 5-10 parts of a retarder and 40-60 parts of water; the preparation method comprises the following steps: dividing water into two parts, uniformly mixing the water reducing agent with one part of water, then adding the cellulose ether and the starch ether while stirring, and carrying out uniform stirring to obtain a mixture I; adding a thickening agent, an air entraining agent, magnesium aluminum silicate and a retarder into the other part of water under stirring, and carrying out uniform stirring to obtain a mixture II; and stirring the mixture I and the mixture II for 2-3 hours to obtain the admixture. When the admixture is used in the machine-made sand plastering mortar, the construction performance of the machine-made sand plastering mortar can be remarkably improved.

Description

technical field [0001] The application relates to the field of construction, more specifically, it relates to a special admixture for machine-made sand plastering mortar and a preparation method thereof. Background technique [0002] my country is a country with a large infrastructure, and the construction of various infrastructure such as roads, railways, and airports has a very high demand for sand and gravel. However, due to the joint influence of restrictions on natural sand mining, crackdown on illegal sand mining, and environmental protection supervision, the price of sand and gravel in most areas of my country has risen again and again, and the supply is still in short supply. Under this environment, machine-made sand has emerged as the times require. Machine-made sand refers to sand processed by sand making machines and other auxiliary equipment. It can be processed into sand of different rules and sizes according to different process requirements, so as to meet dai...

AI Technical Summary

Problems solved by technology

[0003] The inventors found that the existing mortar admixtures on the market are mainly developed for the mortar with natural sand as the mortar aggregate, and directly applying it to the machine-made sand mortar will seriously affect the construction performance of the machine-made sand mortar, such as Severe bleeding, poor batch scraping and easy cracking and hollowing of the mortar

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