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蒋建华,眭源,翁伟新.初始应力损伤对再生混凝土硫酸盐腐蚀的影响[J].河北工程大学自然版,2021,38(2):8-13,37
初始应力损伤对再生混凝土硫酸盐腐蚀的影响
Effect of Initial Stress Damage on the Sulfate Corrosion of Recycled Concrete
投稿时间:2021-02-09  
DOI:10.3969/j.issn.1673-9469.2021.02.002
中文关键词:  再生混凝土  硫酸盐腐蚀  初始应力损伤  力学性能
英文关键词:recycled concrete  sulfate corrosion  initial stress damage  mechanical properties
基金项目:国家自然科学基金资助项目(51408192)
作者单位
蒋建华 河海大学 土木与交通学院, 江苏 南京 210024 
眭源 河海大学 土木与交通学院, 江苏 南京 210024 
翁伟新 河海大学 土木与交通学院, 江苏 南京 210024 
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中文摘要:
      开展了不同骨料取代率(30%、65%和100%)以及不同初始应力水平(0.2、0.4、0.6倍抗压强度)对于再生混凝土抗腐蚀性能影响的试验研究。结果表明,当再生骨料取代率逐级增高时,再生混凝土的腐蚀深度、质量损失率均增加,力学性能指标(抗压强度和动弹性模量)逐渐下降。初始应力损伤对混凝土的影响可以区分为两种,第一,其对腐蚀深度和质量损失率的影响存在阈值效应,只有当初始损伤度大于0.2时,混凝土的腐蚀深度、质量损失率才随损伤度的增大有明显增大的趋势;第二,对于再生混凝土的力学性能,不管是抗压强度还是动弹模量均会随着初始损伤的增大而出现明显的劣化。
英文摘要:
      Experimental studies on the effects of the replacement rates of recycled coarse aggregate (RCA) and the initial stress levels on the sulfate corrosion resistance of recycled concrete were carried out. Results show that when the replacement rate of RCA (denoted as ρr) increases step by step, the corrosion depth and mass loss rate of recycled concrete increase, and the mechanical properties including compressive strength and dynamic elastic modulus gradually decrease. The influence of initial stress damage on concrete can be divided into two types. Firstly, the initial stress damage has a threshold effect on the corrosion depth and mass loss rate of recycled concrete. Only when the initial damage degree is greater than 0.2, the corrosion depth and mass loss rate of concrete increase obviously with the increase of damage degree. Secondly, for the mechanical properties of recycled concrete, both the compressive strength and dynamic elastic modulus will deteriorate with the increase of initial damage.
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