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加载速率对湿态混凝土强度的影响
Strength of Wet Concrete under Different Loading Rates
投稿时间:2016-06-08  修订日期:2016-07-14
DOI:103969/j.issn.1007 9629201704021
中文关键词:  水工混凝土  加载速率  饱和度  抗压强度  劈裂抗拉强度
英文关键词:hydraulic concrete  loading rate  moisture content  compressive strength  splitting tensile strength
基金项目:国家自然科学基金资助项目(51379178,50779057);中央高校基本科研业务费专项资金资助项目(ZD2012015)
     
作者单位
张国辉
ZHANG Guohui
西北农林科技大学水利与建筑工程学院,陕西杨凌712100
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
李宗利
LI Zongli
西北农林科技大学水利与建筑工程学院,陕西杨凌712100
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
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中文摘要:
      首先研究了混凝土在自由吸水条件下的饱和度演化规律,然后对5种湿度状态下的混凝土进行了5种抗压加载速率下的单轴压缩试验和5种劈裂抗拉加载速率下的劈裂抗拉试验,最后建立了不同饱和度混凝土的抗压强度、劈裂抗拉强度随加载速率变化的预测公式,并分解了自由水与加载速率的独立效应.结果表明:相同加载速率下混凝土试件的抗压强度与劈裂抗拉强度均随饱和度的增加而降低;相同饱和度下混凝土试件的抗压强度与劈裂抗拉强度均随加载速率的提高呈近似指数关系增长;相同饱和度下混凝土劈裂抗拉强度随加载速率的变化幅度较抗压强度更为显著.
英文摘要:
      The evolution rule of immersion time on the concrete moisture content was investigated. The compressive and splitting tensile strengths of concrete under five different humidity conditions were observed with five different loading rates of compressive and splitting tensile strengths. From the analysis of the test data, predictive equations that relate the compressive and splitting tensile strengths to the loading rates were formulated. The effects of loading rates were identified and separated from those of the moisture content. The experimental results indicate that at the same loading rate, both the compressive strength and the splitting tensile strength decrease with increasing moisture content. However, for the same moisture content, they exponentially increase with increasing loading rates. Thus, when the loading rates grow at the same rate, the splitting tensile strength considerably increases compared with the compressive strength.
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