泵送混凝土不仅应能改善混凝土的施工性能,对薄壁密筋结构少振捣或不振捣施工,而且应能减少收缩、防止裂缝、提高抗渗性、改善耐久性。但是泵送混凝土强度不足、凝结异常时有发生,特别是裂缝普遍存在,在一定程度上影响结构的抗渗性和耐久性,值得引起足够的重视。 Pumping concrete should not only improve the construction performance of concrete, but also reduce the construction of thin-walled dense-bar structures with little or no vibration. It should also reduce shrinkage, prevent cracks, improve impermeability, and improve durability. However, the strength of pumped concrete is insufficient, and condensation abnormalities occur from time to time. In particular, cracks are ubiquitous, which affects the impermeability and durability of the structure to a certain extent and deserves sufficient attention.