对高性能混凝土的认识及混凝土开裂的问题

高性能混凝土是以耐久性为显著标志，充分考虑环境友好并兼顾可持续发展的高科技混凝土，实现混凝土高性能化，不是简单的材料与配比问题，更重要的是更新观念，精心制备，强化施工。现代混凝土的开裂问题始终是影响混凝土耐久性的重要因素，基于综合分析和评价国内外相关文献，本文归纳总结了混凝土收缩裂缝的不同形式及影响因素，认为混凝土的收缩开裂是不同形式收缩导致开裂的叠加结果。为明晰各种收缩对开裂行为的影响，有必要区分不同形式的收缩开裂，进而有针对性地改善混凝土的抗裂性，同时提出了改善混凝土抗裂性能的措施和建议。

On high performance concrete and concrete cracking

As a kind of high technology concrete, High Performance Concrete (HPC) offers both increased durability and environmental friendliness within sustainable development perspective. To achieve high performance of concrete is more than a material problem or a mixture problem, which contains new ideas, proper producing and strengthened constructions. Shrinkage cracking of concrete has crucial influence on concrete durability or service life in concrete construction. On the basis of investigating the current researches, the author argues that shrinkage cracking of concrete is the synergistic result of different shrinkages actually. Distinguishing the effect of various shrinkages on concrete cracking is indispensable for preventing cracking in concrete by pertinence methods. At last, the author puts forward some advises about preventing concrete cracking.