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今年第一期登载“一小时推定混凝土28天强度”的简讯后,读者纷纷来信要求进一步提供资料。为满足广大读者的要求,现请蔡正咏、李世绮同志将该项技术的具体试验方法作以下介绍。
After the first issue of this year’s “Improved 28-day strength for concrete in one hour” newsletter, readers wrote letters requesting further information. In order to meet the requirements of readers, Comrades Cai Zhengyu and Li Shizhen are asked to introduce the specific test methods of this technology as follows.