中文摘要：

为了提高气候变化条件下水工混凝土的抗冻耐久性,采用自制的气候模拟系统,设定了-5℃、-10℃、-17℃、-30℃、-40℃等5 个冻融过程降温终了混凝土试件中心温度,研究冻融温度对F50、F100、F300 等3 种抗冻设计等级水工混凝土的质量损失、动弹性模量的影响.试验结果表明：随着冻融过程中降温终了试件中心温度的降低,F50、F100、F300 等3 种抗冻设计等级的水工混凝土的质量损失、动弹性模量损失逐渐增大,水工混凝土能经受的最大冻融循环次数也逐渐减少.降低冻融过程中混凝土试件的中心温度可引起水工混凝土抗冻耐久性的降低.

英文摘要：

In order to improve the durability of frost resistance of hydraulic concrete under climate change conditions, a climate simulation system made by the authors was employed to study the effects of freeze-thaw temperatures on the weight loss and dynamic elastic modulus of hydraulic concrete with the three designed antifreeze levels F50, F100, and F300. During the test, the freeze-thaw processes were observed with set five center temperatures of concrete samples:-5℃,-10℃,-17℃,-30℃, and -40℃. The results show that, with decreasing center temperatures of samples in the freeze-thaw processes, the weight loss and dynamic elastic modulus loss of the three designed antifreeze levels gradually increase, while the maximum withstanding numbers of freeze-thaw cycles gradually decrease. That is to say that lowering the center temperatures of concrete samples in freeze-thaw processes will decrease the durability of frost resistance of hydraulic concrete.