Application of water-retaining shrinkage-reducing polycarboxylate water-reducer in preparation of high-performance concrete

Abstract

The invention provides an application of a water-retaining reduced polycarboxylic acid water reducer to preparation of high-performance concrete, and further provides the high-performance concrete containing the water-retaining reduced polycarboxylic acid water reducer. As polyhydroxy is introduced into molecular middle chains of the water-retaining reduced polycarboxylic acid water reducer, hydrogen bonds are formed between hydroxy and among the hydroxy and water molecules, a mico-crosslinking structure is formed, the viscosity of solution in cement paste capillary pores in the concrete is increased, the evaporation rate of the water molecules is delayed, and water-retaining property is remarkably improved, so that shrinkage of the high-performance concrete is reduced. High-performance concrete shrinkage test results indicate that the water-retaining reduced polycarboxylic acid water reducer has a good shrinkage effect, is high in cost performance has no influence on the workability and the strength of the high-performance concrete when being used for the high-performance concrete.

Description

technical field [0001] The invention relates to the use of a water-reducing agent in the preparation of high-performance concrete, in particular to the use of a water-retaining shrinkage-reducing polycarboxylate water-reducer in the preparation of high-performance concrete. Background technique [0002] High performance concrete (HPC) is concrete with durability as the basic requirement. The development of high performance concrete is conducive to improving the use function of buildings, prolonging the service life of buildings, thereby protecting the ecological environment and promoting economic and social development. sustainable development. High-performance concrete is a new type of high-performance concrete, which refers to the concrete with high workability, high strength and high durability, which is prepared by adding admixtures and admixtures using conventional materials and production processes. , has developed rapidly since its inception. However, during the app...

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Problems solved by technology

[0038] Although the use of these shrinkage reducing agents reduces the shrinkage of concrete to a certain extent, the engineering cost increases greatly and the synthesis process is complicated.

[0039] Due to the large amount of cementitious materials used and the low water-to-binder ratio of HPC, the cracking problem is particularly prominent. It has always been a major technical difficulty that has plagued technology and researchers in the industry. At present, there is no effective way to overcome it at home and abroad. Shrinkage reducing agents and polycarboxylate shrinkage reducing agents have been studied both at home and abroad, but the results are not satisfactory.

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