A Review on Different Processing Methods to Improve Pozzolanic Properties of Agricultural Waste Ashes

Several agricultural products are discarded as waste every year. Utilization of this waste becomes a socio-economic solution for agricultural waste disposal. Because of the pozzolanic properties shown by these waste materials, it took considerable benefit of employing them as a replacement for cement in concrete and mortars. Both normal-strength and high-strength concrete are manufactured by incorporating various agriculture based pozzolanic materials, majorly it includes rice husk, wheat straw, corn cob, and sugarcane bagasse ash etc., The implementation of pre-treatment methods before combustion greatly enhances the chemical, physical, and mechanical properties of pozzolanic materials. Acid treatment becomes the most satisfactory pre-treatment method for agriculture based pozzolanic materials. Electrical conductivity and Chapelle activity are two examples of direct and indirect methods that can be used to access pozzolanic activity. It is possible to create structurally good concrete by understanding the pozzolanic activity and hydration process of cement with pozzolanic material.