高原气候条件下混凝土力学性能的研究  

Mechanical properties of concrete under plateau climate condition

作　　者：葛昕[1] 葛勇[1] 杜渊博 蔡小平[1] 杨文萃[1] GE Xin;GE Yong;DU Yuanbo;CAI Xiaoping;YANG Wencui(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090

出　　处：《混凝土》2020年第3期1-4,8,共5页Concrete

摘　　要：高原环境的低湿度和低气压会加速混凝土内部水分的蒸发,进而影响混凝土的强度发展。研究了不同的低湿度(20%、60%)和低气压(0.5、0.75、1.0 atm;1 atm为标准大气压)条件下混凝土的抗压强度和劈裂强度,并且研究了单面干燥条件下混凝土的湿度分布规律。结果表明:低气压和低湿度的环境条件会抑制混凝土力学性能的发展。不同湿度和气压条件下,混凝土抗压强度和劈裂强度的差异主要体现在28 d之后。当环境湿度越低时,混凝土试件的整体相对湿度也就越低,混凝土内外部分的湿度梯度越大。当龄期约为60 d时,对于深度大于200 mm的位置,受到环境湿度和气压的影响较小。Low humidity and low air pressure could accelerate the water evaporation from concrete,and then influence the strength development of concrete.The compressive strength and splitting strength of concrete was researched under different relative humidity and different low air pressure as the curing conditions.Moreover,the relative humidity distribution of concrete was also measured under one-surface drying condition.It was indicated that the low air pressure and low relative humidity could reduce the development rate of concrete strength.The compressive strength difference and splitting strength difference in different humidity and air pressure environment was significant after 28 days.When the environmental humidity decreased,the overall humidity of concrete specimen decreased and the humidity gradient increased.It could be concluded that the internal relative humidity of concrete was not influenced by environmental humidity significantly at about 60 days when the depth is more than 200 mm.

关 键 词：低湿度 低气压 抗压强度 劈裂强度 湿度分布 

分 类 号：TU528.01[建筑科学—建筑技术科学]