Effect of copper slag fine aggregate on corrosion processes and behavior in reinforced concrete prism specimen
Effect of copper slag fine aggregate on corrosion processes and behavior in reinforced concrete prism specimen
复制标题
铜渣细骨料对钢筋混凝土棱柱试件腐蚀过程和行为的影响
DOI：
10.1016/j.conbuildmat.2020.121909
复制
发表时间：
2021
影响因子：
7.4
通讯作者：
Isao Ujike
中科院分区：
文献类型：
--
作者：
Nevy Sandra;Keiyu Kawaai;Isao Ujike
本文报道了混凝土拌合物抗氯离子扩散和钢筋锈蚀的试验结果。通过一系列试验研究了铜渣部分替代细集料对棱柱体试件腐蚀过程和行为的影响。根据日本土木工程师协会（JSCE）G571-2003，在28天和91天的龄期进行稳定状态下的氯离子迁移试验，以确定氯离子渗透到混凝土样品中的扩散系数。此外，一些电化学测试进行了通过反复的湿和干（NaCl 10%）周期长达1年，以检查钢筋混凝土中的腐蚀的概率，腐蚀电流密度，和透氧率。基于氯离子迁移试验，这是从氯离子浓度的累积增加，结果表明，混凝土具有较长的养护期实现较低的氯离子浓度，从而表明有一个增加的抵抗氯离子侵蚀的混凝土。经过一年的干湿循环后，CUS棱柱体试件的氯离子渗透深度和氯离子含量分布与OPC试件基本相似。因此，CUS混凝土的耐久性性能相对于抗氯离子侵入是可比的OPC混凝土。除此之外，人们普遍认为，通过粉煤灰的火山灰反应将粉煤灰掺入混合水泥中，通过降低其扩散率和透氧率来改善混凝土对氯离子引起的钢筋腐蚀的保护。
This paper reports the result of experimental on the resistance to chloride diffusion and steel corrosion of concrete mixtures. A series of tests were performed to investigate the effect of copper slag as partial replacement of fine aggregate on corrosion processes and behavior in prism specimens. Chloride migration tests in steady-state were executed at the age of 28 and 91 days in accordance with Japan Society of Civil Engineers (JSCE) G571-2003 to determine the diffusion coefficient of chloride ions permeated through concrete specimens. In addition, some electrochemical tests were carried out through the repeated wet and dry (NaCl 10%) cycles up to 1 year to examines the probability of corrosion of steel bars in concrete, corrosion current density, and the rate of oxygen permeability. Based on the chloride migration test, which was obtained from the cumulative increase of chloride ion concentration, the results indicate that concrete with a longer curing period achieved lower chloride-ion concentration, thus suggesting that there is an increase in the resistance of concrete against chloride attack. The chloride penetration depth and distribution of chloride content in CUS prism specimens after exposure to wet and dry cycles for one year are almost similar to those of the OPC specimens. Thus, the durability performance of CUS concretes with respect to the resistance against chloride ingress was comparable to that of OPC concrete. Besides that, it is generally recognized that the incorporation of fly ash in blended cement by its the pozzolanic reaction of fly ash improves concrete protection against chloride-induced corrosion of steel bars by reducing its diffusivity and the rate of oxygen permeability.