STRENGTH AND DURABILITY EFFECT OF SELF-COMPACTING CONCRETE REINFORCEMENT WITH MICRO-SILICA AND VOLUME FIBER

Abstract

This paper describes the research on micro-silica, popular in Kazakhstan ferrosilicon production technogenic waste, its impact on self-compacting concrete rheological and physical-engineering properties, and performance and durability improvement of building structures made of this concrete type utilizing volumetric fiber reinforcement. The paper includes the results of laboratory and industrial tests of self-compacting concrete mixtures (SCC) strength and operational properties. The most effective ratio of micro-silica as a filler in the binder and the optimal amount of low-modulus polypropylene fiber was selected to manufacture high-quality self-compacting concrete of C25/30, C30/35, C35/40, C40/45 classes produced using local raw materials. Examples of compositions using micro-silica confirm the possibility of up to 20% cement consumption reduction and increase the concrete frost resistance to F340, reduction of self-compacting concrete volumetric water absorption by up to 30%, increase bending strength by up to 35% with the combined use of silica and polypropylene fiber in a right proportion are described here. The research results provide practical value for self-compacting and cast concrete Kazakhstani manufacturers.