Properties of Fine-Grained Concrete Using Ash of Kazakhstan

Abstract

The aim of the work is a study of the physical and mechanical properties of finegrained concrete using ash of Kazakhstan (namely: the influence of dispersion of hydro-removal ash and liquid glass additives on the properties of fine-grained concrete). This study aims to address the issue of improving the environmental impact, which ensures the quality of concrete by saving cement. It was established that ash in concrete contributed to the formation of a denser structure of the intergranular space of aggregates and a less defective contact zone of aggregates with cement stone. The analysis of the obtained results showed that ash-cement concretes hardened slowly under natural conditions. In the period of 7-14 days of hardening, as a rule, the strength of samples of fine-grained concrete with the addition of hydroremoval ash is lower than the strength of reference samples without ash. The increase in the strength of the samples in the period of 60 days was 6.6...7.0%, and in the period of 90 days -15.0...15.5% compared to the strength of 28 days. The experiments on ash absorption of CaO hydro removal from lime mortar were carried out. The degree of hydration in the ash-cement stone of the studied composition of the developed binder was determined. Research has shown that with a decrease in the concentration of calcium hydroxide in the liquid phase, the activity of the ash increases. This can be explained by the high content of the glass phase. The balance of hydrate neoplasms in the ash-cement binder was experimentally determined. The research results indicate the possibility of using ash in the production of crushed stone concrete as part of the following building materials: dense wall blocks, curbs, paving slabs, for pouring floors, for sound insulation, as a brick mortar.