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微裂缝是所有混凝土结构都具有的,它的存在是正常的现象。它虽然对混凝土结构的变形、强度有影响,但在设计规范中就已经考虑到微裂缝对混凝土强度和抗裂性能的影响,对具体的结构不需另加研究。但微裂缝的存在,结构受力作用时,就会发展成宏观裂缝。其基本过程是原始粘结裂缝的逐渐扩大和新的粘结裂缝的出现,产生少量穿越砂浆的裂缝,穿越砂浆的裂缝发展较快,并出现局部穿越骨料的裂缝,各种裂缝迅速发展并逐渐贯通,形成贯穿裂缝。
Micro-cracks are found in all concrete structures and its presence is normal. Although it affects the deformation and strength of concrete structure, it has already taken into account the influence of microcracks on the strength and crack resistance of concrete in the design specifications, and requires no further study on the concrete structure. However, the existence of micro-cracks, the structure of the role of force, it will develop into macro-cracks. The basic process is the gradual expansion of the original bond crevice and the emergence of a new bond fissure, resulting in a small amount of cracks through the mortar, the rapid development of cracks through the mortar, and the emergence of local cracks through the aggregate, the rapid development of various cracks and Gradually through, forming through cracks.