文章摘要
宁致远,刘云贺,王为标,张凯.不同温度条件下水工沥青混凝土抗压特性及防渗性能试验研究[J].水利学报,2020,51(5):527-535
不同温度条件下水工沥青混凝土抗压特性及防渗性能试验研究
Experimental study on compressive properties and impermeability of hydraulic asphalt concrete under different temperatures
投稿时间:2020-01-04  
DOI:10.13243/j.cnki.slxb.20200006
中文关键词: 水工沥青混凝土  力学性能  温度作用  防渗性能  破坏模式
英文关键词: hydraulic asphalt concrete  mechanical properties  temperature effect  impermeability  failure modes
基金项目:国家自然科学基金项目(51779208);水利部公益性行业科研专项(201501034-03)
作者单位E-mail
宁致远 西安理工大学 西北旱区生态水利国家重点实验室, 陕西 西安 710048  
刘云贺 西安理工大学 西北旱区生态水利国家重点实验室, 陕西 西安 710048 liuyunhe1968@163.com 
王为标 西安理工大学 西北旱区生态水利国家重点实验室, 陕西 西安 710048  
张凯 西安理工大学 西北旱区生态水利国家重点实验室, 陕西 西安 710048  
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中文摘要:
      为研究水工沥青混凝土在不同温度条件下的力学特性和经荷载作用后的防渗性能,在-30℃~30℃条件下对其进行了抗压试验研究,并对荷载和温度作用后的试件进行了渗透试验分析。试验结果表明:温度对水工沥青混凝土的应力-应变全曲线、抗压强度、弹性模量、峰值应变以及破坏模式等力学特性有显著影响。对比水工沥青混凝土在-30℃~30℃条件下应力-应变全曲线特点,可推断-10℃~0℃为其应力-应变特性变化的过渡温度区间。水工沥青混凝土的抗压强度和弹性模量随温度的升高而降低,峰值应变随温度的升高而增大。基于试验结果,本文提出的经验公式较好地反映了抗压强度、弹性模量以及峰值应变随温度变化的规律。在-30℃~0℃条件下,水工沥青混凝土的破坏模式主要为骨料开裂和沥青胶浆与骨料的黏结破坏;在10℃~30℃条件下,破坏模式主要为黏结破坏。此外,水工沥青混凝土经荷载作用后的防渗性能与温度环境有关。在10℃~30℃温度环境中,水工沥青混凝土承受7%的轴向压应变后,其渗透系数仍在10-7~10-6 cm/s量级,防渗性能良好。
英文摘要:
      In order to study the compressive properties of hydraulic asphalt concrete under different tempera-tures and the impermeability after loading, the axial compressive test was carried out at -30℃~30℃, and the permeation test was conducted on the specimens subjected to the combined action of temperature and loading. The test results show that the temperature has significant influence on the stress-strain curve, compressive strength, elastic modulus, critical strain and failure modes. By comparing the stress-strain curve characteristics of hydraulic asphalt concrete at -30℃~30℃, it can be inferred that -10℃~0℃ is the critical transition temperature range. Compressive strength and elastic modulus decrease with the increase of temperature, while the critical strain increases. Based on the test results, the empirical formu-las proposed in this paper better reflect the variation trends of compressive strength, elastic modulus and critical strain varying with the temperature. In addition, the failure at a temperature range of -30℃~0℃ is mainly in binder failure and trans-aggregate failure modes, whereas that at a range of 10℃~30℃ is mainly in binder failure mode. Moreover, the impermeability of hydraulic asphalt concrete after the loading is related to the temperature ambient. When the specimens are subjected to 7% axial compres-sive strain at a temperature range of 10℃~30℃,its permeability coefficient is still in the order of 10-7 cm/s~10-6 cm/s,showing its good impermeability.
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