预应力混凝土管桩是20世纪80年代末兴起的新型建材行业,日前己广泛应用于建筑基础工程。管桩桩身的混凝土强度是管桩质量最重要的指标,它对施工过程、抗弯性能、承载力等起着决定性作用。水泥的品质和掺量是直接影响混 Prestressed concrete pipe pile is a new type of building materials industry that emerged in the late 1980s and has been widely used in building foundation engineering. The concrete strength of pipe pile body is the most important index of pipe pile quality, which plays a decisive role in the construction process, bending resistance, bearing capacity and so on. The quality and volume of cement is a direct impact on the mix