Strain hardening cementitious composite(SHCC)material used as external layers on plain concrete specimen as the only reinforcement is considered in this study. By layering, one can create functionally gradient material(FGM)to control crack spacing, localization and opening. As a variable function in this study fracture energy and effect on distribution of layers are examined. Compared to ordinary RC cracks, formation of micro-cracks increases resistance to moisture, gas and salt penetration, the key for durability of cement-based materials. This numerical study uses finite element method(FEM)software, with material model tailored to available SHCC mixture test results. SHCC material model was designed through numerical uniaxial tensile testing, followed by a bending test of a two-layer material composed of one layer of plain concrete and one layer of SHCC. FGM is then created by layering the SHCC of various fracture energy and the obtained crack formation is studied.
抄録全体を表示