Utilisation of wheat straw for concrete insulation brick

The use of wastes as part of insulation building materials has become a new requirement of green building. This study aimed to investigate the feasibility of using wheat straw as a filler for making thermal insulation bricks to reduce energy loss in buildings. Wheat straw, expanded perlite and asphalt were used to produce straw insulation blocks (SIBs), and the mix ratio of the materials used was determined using the orthogonal method. A reasonable mixing ratio is as follows: wheat straw content (weight ratio) is 23.8%, expanded perlite content 19.8% and asphalt content 56.4%. SIBs were filled into hollow concrete bricks to prepare straw insulation block core-filled concrete bricks (SIBCCBs). The density, compressive strength and thermal conductivity of SIBCCB were measured. The results indicate that the SIBCCB is lightweight, has low carbon dioxide emissions, good thermal insulation performance and compression resistance capacity, and is an ideal insulation block for load-bearing lightweight and non-load-bearing walls.