论文部分内容阅读
混凝土在浇搞后几小时内产生的裂缝可能是由于混凝土的沉降作用引起的,而混凝土在浇捣数天后产生的裂缝则可能是由于混凝土的冷却;混凝土在受约束情况下的收缩;或导致直接拉应力和挠曲应力的外力等原因引起的。会议对防止混凝土裂缝和控制裂缝宽度的一些方法进行了探讨。就受腐蚀情况来说,沉降裂缝可能是最严重的了。温度裂缝常常与沉降裂缝混淆在一起,其实,温度裂缝可能产生于沉降裂缝之前。会议还对1976年修订的英国贮水构筑物施工规范(BS5337即英国标准5377)中,控制温度裂缝和沉降裂缝的措施进行了讨论,对该规范中计算裂缝宽度的一些根据进行了争辩,就影响挠曲裂缝宽度的主要原因取得了部分一致的意见。看来,比CP110(见附录)计算公式更简单的裂缝计算公式至少是准确的。
Cracks in concrete produced within a few hours after pouring may be caused by the settlement of concrete, and cracks in concrete after several days of pouring may be due to the cooling of the concrete; shrinkage of the concrete under constrained conditions; or Direct tensile stress and flexural stress due to external forces and other reasons. The meeting discussed some methods to prevent concrete cracks and control the width of cracks. In terms of corrosion, settlement cracks may be the most serious. Temperature cracks are often confused with settlement cracks. In fact, temperature cracks may occur before settlement cracks. The meeting also discussed the measures to control temperature cracks and settlement cracks in the British Specification for the Construction of Water Storage Structures (BS5337, British Standard 5377), revised in 1976, and debated some basis for calculating the width of cracks in the Code. The main reason for the width of flex cracks was partially consistent. It appears that the crack calculation formula that is simpler than the CP110 (see appendix) formula is at least accurate.