Compression and Shear Properties of Unreinforced Masonry Structures Reinforced by ECC/HECC subjected to High Temperatures

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Compression and Shear Properties of Unreinforced Masonry Structures Reinforced by ECC/HECC subjected to High Temperatures

Gao, Shuling / Hao, Deshuai / Zhu, Yanping / Wang, Zhe

In the case of fire, ordinary mortar as the external plastering layer of masonry structure is prone to explosive peeling at high temperature. Therefore, the hybrid fiber reinforced engineered cementitious composites (HECC) is used to replace the ordinary mortar plastering to strengthen masonry structure, so as to improve the mechanical properties of the masonry structure and the adhesion with the reinforcement layer. In this paper, PB-HECC (mixed with PVA and basalt fibers) and PS-HECC (mixed with PVA and steel fibers) are used to improve the mechanical properties after high temperature, prism compression test and triple shear test are carried out at different temperatures. The test results show that the bonding performance of the engineered cementitious composites (ECC) reinforcement layer is much better than that of ordinary mortar. When the temperature is less than 200°C, the reinforcement layer mixed with basalt fiber (PB group) or steel fiber (PS group) has a higher bearing capacity. PB group has strong energy consumption capacity, but its shear strength decreases the most; When the temperature exceeds 200°C, PS group has the highest compressive capacity, shear bearing capacity and deformation capacity, maintaining relatively good residual mechanical properties.