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针对粒径为25~80 mm的大粒径再生粗骨料混凝土,基于图像重建方法,采用ANSYS有限元软件建立数值模型对其立方体单轴受压性能进行了研究。模拟结果表明:再生粗骨料的形状对再生混凝土中裂缝萌生有影响,初始裂缝出现在再生粗骨料的棱角处;再生混凝土中裂缝发展初期,主要沿新老砂浆界面和天然石子与新砂浆界面发展,然后向新砂浆和老砂浆内部延伸;新混凝土强度低于老混凝土强度时,大粒径再生粗骨料混凝土试件破坏相对较轻;大粒径再生粗骨料混凝土试件中新老砂浆界面对强度有较大影响,该区域在试件破坏前后都是应力最大的区域。
Aimed at the large size recycled coarse aggregate concrete with the particle size of 25-80 mm, the uniaxial compression behavior of the cube was studied by using ANSYS finite element software based on the image reconstruction method. The simulation results show that the shape of recycled coarse aggregate affects the initiation of cracks in recycled concrete, and the initial cracks occur at the edges of recycled coarse aggregate. In the initial stage of cracks development of recycled concrete, the interface between new and old mortar and natural gravel and new mortar Interface development, and then to the new interior of the old mortar and mortar; new concrete strength is lower than the strength of old concrete, coarse particles of large coarse aggregate concrete specimens damaged relatively light; large particle size recycled coarse aggregate concrete specimens in the new The interface of the old mortar had greater influence on the strength, which was the area with the highest stress before and after the specimen was damaged.