Sudden high temperature exposure to concrete is one of the major concerns in building industries. When concrete is
subject to high temperature excess vapour pressure developed inside, and sudden spalling may happen. In this study thermal
insulation characteristic of concrete tried to improve by using raw rice husk. But it is found that rice husk affects the mechanical
properties of concrete, it reduces strength, increase water absorption, increase porosity etc. So, to maintain strength of concrete
additionally polypropylene fibre 2% by weight of cement (adopted from previous studies) is added in concrete. Four different
samples are made and tested for workability, water absorption, compressive strength and thermal gradient test. Up to 300oC
samples gives desirable result and also don’t lose their strength drastically. Thermal gradient has increased as percentage of raw
rice husk
