EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF BIOCHAR CONCRETE AT DIFFERENT AGES
The use of biochar in concrete materials can improve its mechanical properties, achieve carbon sequestra-tion, and enrich the way of solid waste utilization of biomass materials. In order to study the working performance and mechanical properties of three kinds of biochar concrete, biochar concrete with coconut shell, corn straw, and rice husk at different ages are prepared by replacing cement with different mass percentages, and the slump and ba-sic mechanical properties of biochar concrete are studied. The microstructure and hydration products of biochar con-crete are observed by SEM and XRD. The results show that biochar promotes the formation of hydrated calcium sili-cate in concrete, and the overlapping of hydration products is dense, which fills the internal pores and increases the compactness, thus improving the macroscopic mechanical properties of concrete. Biochar significantly improves the early strength of concrete at 7 d and 14 d. The early compressive strength is increased by up to 19.7％;the splitting tensile strength is increased by up to 21.7％, and the flexural strength is increased by up to 17.3％.
万方数据
维普
