氯盐环境下石墨烯纳米片改性水泥砂浆耐蚀性研究  

Research on corrosion resistance of graphene nanoplatelets modified cement mortarin chloride environment

作　　者：陈妤[1] 李星辰 李创创 李国浩 刘荣桂[1] CHEN Yu;LI Xingchen;LI Chuangchuang;LI Guohao;LIU Ronggui(Department of Civil Engineering,Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《混凝土》2022年第12期145-148,共4页Concrete

基　　金：国家自然科学基金项目(51778272)。

摘　　要：石墨烯材料近些年多用于研究如何提高水泥基材料的力学性能,而在耐久性能方面的研究尚不丰富。以石墨烯纳米片(GNPs)为研究对象,用来改性水泥砂浆。将4种GNPs改性水泥砂浆(掺量分别为0、0.02%、0.06%、0.10%)浸泡在浓度为5%的Na Cl溶液中一维腐蚀240 d,通过RCT试验检测内部的氯离子百分含量来研究GNPs掺量对耐腐蚀性能的影响。试验结果发现,与M0(0GNPs)相比,M6(0.06%GNPs)能够很好地阻止氯离子侵入,有效降低氯离子含量达到60%以上。与此同时,借助SEM和EDS手段表征内部被腐蚀后的微观形貌及元素。分析发现,M6的孔洞被填充、裂缝减少,密实度得到相对较高。大量Friedel盐被阻挡,降低了腐蚀能力,从而提高了耐久性能。Graphene materials have been used to study how to improve the mechanical properties of cement-based materials in recent years,but there is not much research on durability.It takes graphene nanoplatelets(GNPs)as the research object to modify cement mortar.Four kinds of GNPs modified cement mortars(with 0,0.02%,0.06%and 0.10%)were immersed in a Na Cl solution with a concentration of5%for one-dimensional corrosion for 240 d.The percentage of internal chloride ion was detected by RCT test to study the influence of GNPs content on corrosion resistance.The test results found that,compared with M0(0GNPs),M6(0.06%GNPs)can well prevent the intrusion of chloride ions and effectively reduce the chloride ion content by more than 60%.Meanwhile,the internal micro morphology and elements after corrosion were characterized by SEM and EDS.The analysis found that the holes of M6 were filled and the cracks were reduced,which made the density relatively high.Large amount of Friedel salt was prevented,reducing the corrosionability,thereby improved the durability.

关 键 词：石墨烯纳米片(GNPs) 水泥砂浆 NACL溶液 氯离子 微观形貌 

分 类 号：TU528.01[建筑科学—建筑技术科学]