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设计并完成了75块再生混凝土立方体试块和25块棱柱体试块进行立方体抗压强度试验,劈裂抗拉强度试验,轴心抗压强度试验,并以普通骨料制成的混凝土进行对比,研究了再生混凝土的强度与再生粗骨料取代率之间的关系。结果表明,再生混凝土的破坏形态主要分为明显裂痕,轻微裂痕,不明显三种,其中试件多数呈轻微裂痕破坏,破坏情况与普通试件基本一致,在水灰比相同的情况下,再生混凝土的抗压强度比普通混凝土强度高,抗压强度随取代率的增加而增强。再生混凝土的劈裂抗拉强度比普通混凝土强度低,曲线整体呈波浪型,再生混凝土劈裂抗拉强度最低。
Designed and completed 75 pieces of recycled concrete cubes and 25 pieces of prism cubes to carry out cubic compressive strength test, splitting tensile strength test and axial compressive strength test, and compare them with ordinary aggregate made of concrete , Studied the relationship between recycled concrete strength and recycled coarse aggregate replacement rate. The results show that the failure mode of recycled concrete is mainly divided into three types: obvious crack, slight crack, and no obvious crack. Most of the specimens are slightly cracked. The damage condition is basically the same as that of ordinary sample. Under the same water-cement ratio, Compressive strength of concrete is higher than ordinary concrete, compressive strength increases with the increase of substitution rate. The splitting tensile strength of recycled concrete is lower than that of ordinary concrete, and the whole curve is wavy. The splitting tensile strength of recycled concrete is the lowest.