热带沙漠沿海气候区大体积混凝土配制及性能

Preparation and performance of mass concrete in coastal tropical desert climate zone

依托多哈港实际工程,按照热带沙漠沿海气候区室内环境作用参数,针对C30、C40以及C50共3个强度等级混凝土的典型配比,利用温湿度交变箱模拟热带沙漠气候特点,研究温度和湿度对新拌混凝土坍落度、凝结时间以及重塑时间的影响,确立环境作用因素对新拌混凝土施工性能的影响规律,建立环境作用因素与新拌混凝土施工性能之间的函数关系,通过开展混凝土温度-应力试验来评价大体积混凝土在温度场和强约束边界条件共同作用下的混凝土的抗裂性,为热带沙漠沿海气候区大体积混凝土施工质量控制提供参考依据。

For Doha port project, according to the indoor environment parameters of the tropical coastal desert climate, we use the ahemating temperature and humidity chamber to simulate the tropical desert climate features for typical mix proportion of C30, C40 and C50 and study the effect on fresh concrete slump, setting time and remodeling time. The effect law of environment role factors is established on the new mix concrete construction performance, and the function relationship between environment role factors and new mix concrete construction performance is established too. Concrete temperature-stress testing is conducted to evaluate the crack resistance of concrete in mass concrete temperature field and the strong interaction constraints of boundary conditions to provide reference for the quality control of mass concrete construction for coastal tropical desert climate.