Abstract: High ductility fiber reinforced fire-resistive engineered cementitious composites (FR-ECC) have the advantages of fire inflammability, non-decomposition of toxic gases at high temperatures, and good durability. At the same time, it has the advantages of high ductility and good crack resistance, and has been widely concerned and studied in recent years. Conventional FR-ECC uses organic fiber, which is decomposed and gasification at high temperature, resulting in the ductility reduction and cracking of refractories, which restricts the practical application of FR-ECC. In this work, aluminate cement with excellent high temperature resistance and basalt fiber (BF) were used as raw materials to design and develop lightweight high ductility basalt fiber reinforced engineered cementitious composites (LWBF-ECC), and the evolution law of mechanical and thermal properties of the material after high temperature was studied. The variation rules of dry density, phase change, uniaxial tensile strength and compressive strength of LWBF-ECC at room temperature and elevated temperature were studied, and the variation rules of ductility and thermal conductivity at different temperatures were also studied. The results show that the ductility of LWBF-ECC can reach 0.82% at room temperature, which is 80 times of the conventional sprayed fire-resistant material on the surface of steel structure. Due to BF’s excellent high temperature resistance, it can still give full play to the bridging function at high temperature. When the exposure temperature is below 400 ℃, LWBF-ECC material shows strain hardening in tensile, and it still retains a certain ductility at high temperature. The ultimate strains at 100, 200 and 400 ℃ are 0.78%, 0.32% and 0.18%, respectively. With the temperature elevated, LWBF-ECC dry density decreases, porosity increases and thermal conductivity decreases. The hydration change and water of crystallization loss of cementitious materials at high temperature leads to the higher cement content, the more mass loss, and the more obvious dry density decrease.
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2023, Vol. 37 
