地下连续墙水下抗冻混凝土的施工与检测

Construction and testing of underwater frost-resisting concrete for diaphragm

板桩码头地下连续墙顶部为抗冻混凝土，强度等级为C30 F300，采用导管法进行水下浇注。抗冻混凝土浇注前进行配合比设计，拌制后用导管进行浇注，需要提前0．5m更换混凝土，并超灌0．5m，取芯后加工成试件可检测其抗压、抗冻强度。

The frost-resisting concrete for the top of diaphragm of sheet-pile wharf, with a grading strength of C30F300, is poured underwater by tremie method. The mix proportion design was carried out before pouring of frost-resisting concrete. And then, concrete was poured by tremie after mixing. The concrete should be replaced before 0.5 m and with 0.5 m over-pouring. The compressive strength and freezing resistance can be measured once it was processed into test piece after removing the core.