细微裂缝 meaning in Chinese

microcracking

When mass concrete forms , defects will produce such as some micro crack resulting from the different temperature between the surface and the inside . how this micro crack forms and develops is a very important subject hi materials
混凝土结构、尤其是大体积混凝土结构在浇筑成形的过程中，由于受到内外温度变化的影响从而使混凝土体内或表面形成细微裂隙等缺陷，研究细微裂缝（微裂纹）的形成与发展在混凝土材料学中是一项十分重要的课题。