大体积混凝土基础底板施工的裂缝控制

Crack Control in Construction of Mass Concrete Foundation Slab

针对基础工程结构设计特点,以某基础工程大体积混凝土的施工实例,介绍了大体积混凝土的原材料选择、配合比设计、浇注工艺、养护测温及温度控制技术,并给出了完整的温差和温度应力的理论计算数据。由于采取了综合技术措施,该基础工程大体积混凝土施工时不留置任何后浇带或施工缝,一次性连续浇捣成型。经观察,未发现任何有害裂缝,混凝土质量优良,确保了工程质量。

According.to the features in foundation structure design and incorporating with the practice for a construction of mass concrete foundation structure, mass concrete material selection, mixture ratio design, pouring technology, concrete curing, temperature measure and control technology were presented. The entire temperature difference and temperature stress theoretical calculation data were also proposed. Because comprehensive technology measures were taken, the mass concrete of this foundation structure was continuously poured at a time, no later-poured belt or construction joint reserved during concrete placement. By later observation, no harmful crack was found, the concrete quality was fine, and the project quality was therefore ensured.