EFFICIENCY OF POLYCARBOXYLATE SUPERPLASTICIZERS IN ASH-CONTAINING CONCRETE

Abstract

In this article the possibility of significant improvement of the construction and technical properties of fly-ash-containing concrete by using polycarboxylate superplasticizers was investigated. The complex of technological aspects related to the production of High-Performance Concrete had been investigated, and a complex of experimental-statistical models has been obtained that will allow estimating the quantitative influence of the main technological factors on their properties. Fly-ash-containing concrete with polycarboxylate superplasticizers admixtures allow to obtain self-compacting concrete with compressive strength at 28 days of 65...92 MPa. Such concrete is characterized by intense strength gain at early age of hardening and comply with the requirements for High Performance Concrete. Strength of concrete at the one-day age reaches no less than 35% and at the three-day age - 50% of the designed strength. In the case of  W/C <0.3, the increase of the fly ash amount from 30 % to 40 % by cement weight does not result in significant decrease of the concrete compressive strength