[硕博论文下载]混凝土结构裂缝成因分析及加固技术

【中文题名】 混凝土结构裂缝成因分析及加固技术
【英文题名】 Analysis for Causes of Cracking in the Concrete Structure and Strengthening Technology
【中文摘要】 开裂问题一直是混凝土材料研究领域中的热点，混凝土的早期抗裂问题近些年尤其受到关注。混凝土的开裂可以划分为荷载引起和变形引起两种，而后者占开裂问题的80％以上，是迫切需要解决的难题。自由收缩值不能直接用于评价混凝土的抗裂性能，试验必须在约束条件下进行。而国外在约束试验方法上取得了多方面的进展，本文按照平板式、环形和单轴型的分类方法对此进行了系统总结。 综合试验结果表明胶凝体系的抗裂性能与混凝土的抗裂性能有较好的相关性，并可以避免混凝土复杂组成的干扰。建立了基于环装置的开裂时间评价标准，对一些水泥产品的试
【英文摘要】 Cracking is always a hot issue in the field of concrete materials research. Cracking of early ages is especially cared for. Cracking can be caused by loading or deformation. The latter one is commonly considered as the main factor, and need to be solved urgently. It has been proved that shrinkage can’t be used as the indicator of crack resistance of concrete and the evaluation experiments should be carried out under restrained conditions. Till now much progress have been made on the restrained shrinkage