大流动性混凝土给人的直观感觉和按着低流动性混凝土的设计原理来分析，似乎其质量不如低流动性混凝土。其实不然，掺外加剂并控制良好的大流动性混凝土，不仅不降低质量，反而会提高质量。这包括：（1）减少干燥收缩，防止混凝土开裂；（2）减少混凝土拌合物的泌水和沉降；（3 The intuitive feel of high-flow concrete and the analysis of low-flow concrete design principles seems to be inferior to low-flow concrete. In actual fact, adding an admixture and controlling a good, high-flow concrete not only does not reduce the quality, but also improves the quality. This includes: (1) reducing drying shrinkage and preventing cracking of concrete; (2) reducing bleeding and sedimentation of concrete mixture; (3)