影响膨胀剂使用效果的若干因素

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，有实际结构中的情况差别很大，也应当进行研究。

Several Factors Influencing Effectiveness of Expansive Agent

In view of some problems appearing frequently in use of expansive agent in recent years, it is necessary to study factors influencing the effectiveness of expansive agent, such as water to cement ratio lower than 0 4, varying dosages of various mineral admixtures in concrete, high temperature in mass concrete, restrained level in structure, etc. Moreover, the conditions, such as restrained mode, dimension, temperature and humidity, used in the present method of testing performances of expansive agent in concrete are quite different from the real structure, so that they are also required to be studied for quality control.