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为了实现再生混凝土试件强度性能的仿真计算分析,在细观层次上将试件看成是由天然粗骨料、新硬化水泥砂浆、老硬化水泥砂浆、天然粗骨料与老硬化水泥砂浆的老粘结带以及老硬化水泥砂浆与新硬化水泥砂浆的新粘结带形成的五相非均质复合材料,以随机骨料模型代表再生混凝土的细观结构,应用非线性有限元法模拟试件的细观损伤断裂,从而求得其宏观力学强度和破坏过程,据此可解释试件的破坏机理.计算结果表明,试件的单轴抗压强度与试验结果较为吻合,试件的破坏机理符合一般规律,该方法为再生混凝土试件强度性能的数值模拟提供了一种新的技术途径.
In order to realize the simulation calculation and analysis of the strength performance of recycled concrete specimens, the specimens are considered as the composite materials of natural coarse aggregate, newly hardened cement mortar, old hardening cement mortar, natural coarse aggregate and old hardening cement mortar Old adhesive tapes and new adhesive tapes of old hardened cement mortar and newly hardened cement mortar. The random aggregate model is used to represent the mesoscopic structure of recycled concrete. The nonlinear finite element simulation test And the macroscopic mechanical strength and failure process of the specimen can be obtained, and the failure mechanism of the specimen can be explained. The calculation results show that the uniaxial compressive strength of the specimen agrees well with the test result, The mechanism is in accordance with the general law. This method provides a new technical approach for the numerical simulation of strength properties of recycled concrete specimens.