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鉴于近年来在膨胀剂的使用中不断出现问题 ,有必要对影响膨胀剂效用的因素 ,例如低于 0 4水灰比的影响、不同种类不同矿物掺和料的影响、大体积混凝土中温度的影响以及结构中约束条件的影响等。此外 ,目前用于测定膨胀剂性能的方法和条件如约束方式、尺寸、温度和湿度等 ,与实际结构中的情况差别很大 ,也应当进行研究
In view of the continuous problems in the use of expansive agents in recent years, it is necessary to consider the influence of the expansive agent on the effectiveness, such as the effect of water-cement ratio below 0 4, the influence of different kinds of mineral admixtures, the temperature in mass concrete Impact and the impact of constraints in the structure. In addition, the methods and conditions currently used to measure the properties of expansive agents, such as the mode of confinement, size, temperature and humidity, are quite different from those in the actual construction and should also be studied