论混凝土的施工温度与结构裂缝外文翻译

论混凝土的施工温度与结构裂缝外文翻译 On the construction of concrete temperature and cracks 1. the causes of the

论混凝土的施工温度与结构裂缝外文翻译 On the construction of concrete temperature and cracks 1. the causes of the cracks Cracks in concrete are avariety of reasons, mainly temperature and humidity changes, brittle and uneven concrete, as well as the structure is irrational, failure of raw materials (such as alkali-aggregate reaction), template deformation, and so on the basis of differential settlement. The concrete to harden off alarge number of cement during the hydration heat, the internal temperature rising on the surface caused by tensile stress. Late in the cooling process, due to coagulation on the basis of or be bound by the old, will emerge in the concrete tensile stress. Lower temperatures in the concrete surface will be alot of tensile stress. When the tensile stress beyond the capacity of concrete crack, the cracks will appear. Anumber of concrete changes in the internal humidity or changes very little slow, but possible changes in surface humidity or more dramatic changes. Such as conservation, failed to keep dry when wet, surface shrinkage deformation of concrete subject to internal constraints, but also often leads to cracks. Short-term loading