Experimental studies of the strength of fine-grained concrete with implementations of organomineral additives

Abstract

Experimental studies of the strength of fine-grained concrete with implementations of organo mineral additives were carried out. The organo mineral additive in the amount of 5-15% by weight of cement has a significant effect on the strength characteristics. Zeolite-containing rock with a specific surface area of 4000 cm2/g was used in the studied compositions. The amount of water added to the mixture also increases with an increase in the amount of organo mineral additive in the concrete mixture. The introduction of an organo mineral additive as a mineral additive instead of a part of the cement promotes the pozzolanic process, in which amorphous silica (SiO2) is bound to the lime formed during cement hydration as a result of the transition to down-basic hydro silicates. The addition of zeolite-containing rocks in an amount of 5-15% by weight of cement has a significant effect on the strength characteristics. The greatest increase in compressive and flexural strength is achieved by replacing 10% cement with TPP ash (heat from a power plant). It was established that a 10% dosage of TPP ash is optimal and is used for a further selection of the composition of fine-grained concrete. The resulting mixture has increased workability and plasticity. The most optimal dosage of additives is 1-1.5%. As the second mineral additive, we used an additive of technogenic origin - microsilica, i.e. ash from burning rice husks. After studying the literature, it was concluded that the addition of microsilica in an amount of 10-12% by weight of cement most contributes to increasing the strength of concrete. The research work is aimed at improving the properties of cellular concrete, developing their composition and production technology by introducing minerals and modifying additives. The results of the research work provide an increase in manufacturability, strength, water and frost resistance, and operational reliability of the obtained materials. The joint implementation of ash and a chemical mixture into fine-grained concrete allows concluding that the strength indicators increase, and the water-cement ratio and porosity decrease.