摘要
试验利用电热箱模拟自然环境高温,研究在相对高温60、80、120℃、自然冷却降温、水冷却降温、"相对高温-自然冷却"循环和"相对高温-水冷却"循环作用下,橡胶混凝土的强度变化规律及机理。试验结果表明:基准混凝土、基准橡胶混凝土和改性橡胶混凝土的抗压强度随温度的升高而降低,其中基准混凝土的降低幅度较大,在120℃相对高温时,其抗压强度仅为基准橡胶混凝土与改性橡胶混凝土的76.3%、75.0%(NaOH-RC)、70.9%(FH-RC);基准混凝土和改性橡胶混凝土由相对高温降温后,抗压强度均有下降,水冷却降温后的抗压强度要小于自然冷却降温后的抗压强度;随着"相对高温-自然冷却"和"相对高温-水冷却"循环次数增加,基准混凝土、基准橡胶混凝土和改性橡胶混凝土的抗压强度又有所提高,相同循环次数时,改性橡胶混凝土的抗压强度稍大于基准橡胶混凝土的抗压强度。
Simulating the high temperature of natural environment with the electric box,the experiment studied the change rule and machanism of strength of rubber concrete under the action of relatively high temperature 60 ℃,80 ℃ and 120 ℃,natural cooling,cooling water cooling,and relatively high temperature-natural cooling circulation and relatively high temperature,water cooling loop.The test results show that the compressive strength of reference concrete,benchmark rubber concrete and modified rubber concrete reduced with the rise of temperature,and the reduction of reference concrete is bigger which is 76.3% and 75.0%(Na OH-RC)、70.9%(FH-RC) of benchmark rubber concrete and modified rubber concrete.The compressive strength of reference concrete and modified rubber concrete reduced after cooling from a relatively high temperature,and the compressive strength after water cooling is less than the compressive strength after natural cooling.The compressive strength of reference concrete,benchmark rubber concrete and modified rubber concrete improved with the increased of"relative high temperature-natural cooling"and"relative high temperature-water cooling"cycle,and the compressive strength of modified rubber concrete is slightly greater than that of benchmark rubber concrete under the same number of cycles.
作者
袁群
冯凌云
闫治宇
曹宏亮
YUAN Qun;FENG Lingyun;YAN Zhiyu;CAO Hongliang(Henan Key Laboratory of Hydraulic Engineering Safety Technology,Zhengzhou 450003,China;College of Water Conservancy,North China Institute of Water Conservancy and Hydroelectric Power,Zhengzhou 450003,China;Henan Provincial Water Conservancy Research Institute,Zhengzhou 450003,China)
出处
《混凝土》
CAS
北大核心
2019年第12期29-32,36,共5页
Concrete
基金
水利部公益性行业科研专项(201301027)
关键词
自然环境
相对高温
橡胶混凝土
抗压强度
natural environment
relatively high temperature
rubber concrete
compressive strength
