Additive for airfield pavement machine-made sand dry hard concrete

Abstract

The invention discloses an additive for airfield pavement machine-made sand dry hard concrete. The additive comprises 30 to 50 parts of a water reducing agent; 0.02 to 0.1 part of a water retaining agent; 0.01 to 0.05 part of a defoaming agent; 0.1 to 0.5 part of an air entraining agent; and 50-70 parts of water. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content is 40%-45%, and the water reducing rate is 20%-25%. The water retaining agent is composed of the following components in parts by weight: 48 to 52 parts of hydroxypropyl methyl cellulose ether, 18 to 22 parts of bentonite, 9 to 11 parts of diatomite, 9 to 11 parts of polyvinyl alcohol and 9 to 11 parts of polyacrylamide. The defoaming agent is a polyether defoaming agent. The air entraining agent is prepared from the following raw materials: 48 to 52 parts of triterpenoid saponin, 18 to 22 parts of sodium lauryl sulfate, 9 to 11 parts of polyethylene glycol, 9 to 11 parts of gelatin and 9 to 11 parts of carboxymethyl cellulose. The water is deionized water or industrial water with the conductivity of less than 20 [mu]S / cm. The additive has good mud-resistant and plastic-retaining effects, and can reduce the viscosity of concrete and reduce the shrinkage of the concrete.

Description

technical field [0001] The invention relates to the field of chemical reagents, in particular to an admixture for machine-made sand dry hard concrete on airport pavement. Background technique [0002] With the economic development of our country, there are more and more airport constructions in various provinces and cities, and as time goes by, more and more airport pavements need to be maintained and replaced. The existing airport pavement replacement or installation methods are generally Pouring or installing prefabricated road panels. The prefabricated pavement panels installed are generally prefabricated in the pavement pavement processing factory. The existing concrete used for airport pavement generally has specific requirements for moisture content and hardness, especially for The machine-made sand concrete used on the pavement of the airport uses machine-made sand. Compared with natural sand, machine-made sand has obvious economic advantages. Although the machine-ma...

AI Technical Summary

Problems solved by technology

However, compared with natural sand, the fineness modulus, grain shape, gradation, and angularity of machine-made sand still have certain shortcomings. Compared with natural sand, machine-made sand has a larger fineness modulus, poorer gradation, and rough grain surface , Strong angularity

[0003] Due to the use of machine-made sand in the dry hard concrete of machine-made sand on the airport pavement, the freshly mixed machine-made sand pavement concrete has disadvantages such as poor workability, large water absorption, difficulty in extracting slurry, and rapid loss of consistency, which is not easy to construct. In general, only water reducing agents are used, which can only reduce water, and cannot solve various problems in existing machine-made sand concrete.

Images