为了查明混凝土中裂缝的自愈现象,苏联对有缺陷和无缺陷的试件作了抗拉强度的比较试验。在特定的条件下将混凝土试件折断,再使断口密贴,然后存放在水中或湿空气中养生。在养生210天以后,比较了无缺陷试件和折 In order to find out the self-healing of cracks in concrete, the Soviet Union conducted comparative tests on the tensile strength of defective and non-defective specimens. Under certain conditions, the concrete specimens were broken, and the fractures were closely attached and then stored in water or in moist air. After 210 days of health, compared with non-defective specimens and folds