Study on Toughness of Strain Hardening Cementitious Composites (SHCC)
Lower tensile strength and worse toughness of cementitious composites are the dominant reason of incidental cracks and deterioration of durability for reinforced concrete (RC) structures. The experimental results indicate that high elastic modules Polyvinyl Alcohol ( PVA) Fiber can enhance the ductility of the cementitious composites and present strain hardening and multiple cracks. Consequently, durability of RC structure can be improved. Force-deflection curves of PVA-SHCC with different mix proportions and loading velocity were achieved by four-point bending tests. Fracture energy was calculated by CONSOFT software as well. The results show that silica fume increases the compressive strength, while the maximum flexural load capacity, deflection and fracture energy decrease. High performance of methyl cellulose improves the brittleness of PVA-SHCC. When the loading velocity is reduced, numbers of multiple cracks manifold and strain hardening behavior manifest markedly. The maximum sand diameter of SHCC is larger than that of Engineered Cementitious Composites (ECC). Although the ultimate tensile strain is lower than that of the latter, its suitable for application. Study on toughness of SHCC is one applied method, which can optimize SHCC durability oriented.
ECC fracture energy PVA Fiber, strain hardening cementitious composites (SHCC) toughness
TIAN Li XU Ting-hua ZHAO Tie-jun FAN Hong
School of Civil Engineering,Qingdao Technological University, Qingdao 266033,China
国际会议
北京
英文
181-182
2006-08-03（万方平台首次上网日期，不代表论文的发表时间）