本文根据成都双铁下穿工程咬合桩对混凝土的技术性能要求,开展了超缓凝混凝土的凝结时间、工作性能及力学性能试验研究,研制出性能稳定的C30超缓凝混凝土,其初凝时间大于60h,工作性能良好,3d强度小于3MPa,28d强度大于30MPa,满足工程设计要求,并在工程中成功应用,取得较好的社会、经济效益。 According to the technical performance requirements of Chengdu double-under-penetrating engineering biting pile for concrete, the experimental research on the setting time, working performance and mechanical properties of the super-setting concrete is carried out, and the C30 super-setting concrete with stable performance is developed. The initial setting time The working performance is better than 60h, the strength of 3d is less than 3MPa, the strength of 28d is more than 30MPa, which meets the engineering design requirements and has been successfully applied in the project and achieved good social and economic benefits.