EFFECTIVE HIGH-STRENGTH RAPID HARDENING CONCRETE

Abstract

The Department of Building Products Technology and Materials Science NUWEE has conducted a number of studies on reducing the resource and energy intensity of the production of high-strength rapid-hardening concrete.

It has been established that it is possible to obtain concrete with a compressive strength of up to 90 MPa at the age of 28 days and up to 50% of the 28 days strength at the age of 1 day using composite cements containing 50% clinker, 12% blast furnace slag and 35% fly ash. The cement contains a complex additive of propylene glycol and a superplasticizer.

It has been experimentally shown that metakaolin can serve as a substitute for microsilica as an active mineral additive when producing high-strength concrete.

A technology has been developed for producing high-strength rapid-hardening concrete based on activated low-clinker cements. Activation of cement containing 12% clinker is achieved by introducing a complex additive of lime and silicon sodium fluoride.

The possibility of obtaining high-strength self-compacting and reactive powder ash and slag-containing concretes has been substantiated. The effectiveness of dispersed reinforcement of high-strength concretes with steel and basalt fibers has been determined.