MODIFIED FINE-GRAINED CONCRETE USING RICE HUSK ASH

Abstract

In domestic and foreign construction practice, special attention is paid to the issues of resource and energy saving. Any possibility of partial replacement of cement with cheap fillers is considered,which can include rice husk ash. Due to availability and low cost it can be a cheap alternative to imported microsilica and metakaolin. The paper presents the results of research on the use of rice husk ash in amorphous form with SiO2 content of 81.3 % as a pozzolanic additive in cement. The microstructure of rice husk ash particles,which consist of multiple agglomerates of silica nanoparticles, often ranging in size from a few tens to hundreds of nanometers, is investigated. Positive changes in the microstructure of the cement matrix are observed.The prepared rice husk ash, when added to cement, helps to improve the physical and technical performance of fine-grained concrete. At the content of rice husk ash - 6 - 8 % and superplasticizer NEOLIT 303 – 0.2...0.8 % the strength of fine-grained concrete in 90 days ≥ 30 MPa