在大体积混凝土施工中，由于水泥水化热等多种因素产生的混凝土结构裂缝将影响混凝土的耐久性能和力学性能。
In mass concrete construction, the structural cracks by cement hydration heat will influence the durability and mechanical properties of concrete.
大体积混凝土在浇筑过程中，由于某些原因，混凝土内部会产生影响工程安全的各种质量缺陷。
For some reasons, in the concreting process of bulky concrete, there will be some quality defects that influence engineering safety in the concrete.
研究了大体积az91 D镁合金在SIMA法制备半固态浆料过程中组织的演变规律，并对半固态组织球状化演变的影响因素进行了分析。
The microstructure evolution of AZ91D magnesium alloy semisolid slurry in the SIMA process was investigated, and the influencing factors on spherical microstructure evolution were analyzed.
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