坍落度在100~150mm的混凝土称为流动性混凝土，坍落度在160mm以上称为大流动性混凝土。在路桥工程中，流动性混凝土主要包括泵送混凝土、喷射混凝土和水下混凝土。
目前，混凝土特别是大流动性混凝土容易产生早期裂缝。
Presently, concrete especially high flowing concrete can easily crack at early ages.
该设计避免了高强大流动性混凝土配合比设计仅依靠不断试配调整的局限性，使设计过程有章可循。
We can avoid some limitations which appear in the procedure of the design of the high strength with high fluidity, such as trial with continuous adjustment.
聚丙烯纤维不适于大流动性混凝土，对中小流动性的混凝土匀质性改善作用大，聚丙烯腈不宜用于匀质性的改善。
The polypropylene fibre have the better effect to concrete that the flowability is not too big than that is big. The polyacrylonitrile have no use to improve the homogeneity of concrete.
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