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采用橡胶粉等体积代砂的方法,选择橡胶粉体积含量为5%、10%和12%,通过试验探讨了等抗压强度(40 MPa)条件下橡胶粉用量对碾压混凝土力学强度、抗裂性能和变形性能的影响及其变化规律。结果表明:橡胶粉的掺入使碾压混凝土的韧性得到改善,压缩破坏表现出明显的韧性破坏特征,碾压橡胶混凝土的立方体抗压强度、轴心抗压强度、抗拉强度和抗弯强度之间具有与普通混凝土相近的对应关系;等抗压强度条件下,碾压橡胶混凝土的抗弯强度、抗拉强度和极限拉伸值较不掺橡胶粉的碾压混凝土有所增大;橡胶粉的添加不会改善碾压混凝土的干缩性能,反而会使干缩变形速率和干缩变形量有所增大。
With the method of replacing the sand with the volume of rubber powder and selecting the volume content of the rubber powder as 5%, 10% and 12%, the effects of the amount of rubber powder on the mechanical strength of roller compacted concrete under constant compressive strength (40 MPa) Crack performance and deformation performance and its variation. The results show that the incorporation of rubber powder improves the toughness of the roller compacted concrete, and the compressive failure shows obvious ductile failure characteristics. The cubic compressive strength, axial compressive strength, tensile strength and flexural strength of roller compacted rubber concrete With the similar relationship with the normal concrete; under compressive strength conditions, the flexural strength, tensile strength and ultimate tensile value of RCC rubber increased compared with the RCC without rubber powder; rubber The addition of powder will not improve the dry shrinkage of roller compacted concrete, but will increase the deformation rate and shrinkage of dry shrinkage.