对膨胀剂在使用中出现问题的讨论

当前使用膨胀剂出现一些问题是由于对膨胀剂的认识与生产和应用发展的速度不相符，对膨胀剂使用不当而造成的。本文讨论了水灰比的变化、矿物掺和料的掺用、大体积温升，结构中的约束条件以及混凝土的搅拌、养护等对膨胀剂效能的影响。现行检测掺膨胀剂的混凝土膨胀率的方法与实际结构中情况的差别比较大，也是需要研究的问题

Discussion on problems appearing in use of expansive agent

Appearance of some problems in use of expensive agent recently is due to that present knowledge on expensive agent is not conform with developing velocity of manufacture and application, and incorrect use under new conditions. Experiments and researches on some problems, such as influence of water cement ratio changing, adding of mineral admixture, temperature rise in mass concrete and restrained level in structure, etc, are required. Present test method for performance of expensive agent in concrete is quite different from the real structure, so that it is also required to be study for quality control.