摘要
以地聚物再生混凝土为基体,将混凝土浸泡于pH=1.0的硫酸溶液中48 d,以其表观损伤、抗压强度、质量损失、中和深度作为耐硫酸性能指标,研究不同掺量的氧化石墨烯(0.01%,0.03%,0.05%,均为质量分数,下同)对混凝土抗硫酸溶蚀性能的影响。此外,通过SEM、XRD、FTIR对氧化石墨烯的改性效果进行微观分析。结果表明:掺入少量的氧化石墨烯可显著提高混凝土的抗硫酸性能,但随着掺量的增加改性效果逐渐减弱。改性后混凝土的抗压强度分别提高56.0%、17.0%、6.0%,且经硫酸溶蚀48 d后仍优于未改性混凝土。48 d后掺量为0.05%的混凝土出现最大的质量损失和中和深度,以及SEM图中较差的界面过渡区和较多松散的腐蚀产物代表其改性效果最差。综合宏观表现、XRD和FTIR分析,确定氧化石墨烯掺量为0.01%时地聚物再生混凝土具有最佳的抗硫酸溶蚀性能。
Taking geopolymer recycled concrete as matrix,the concrete was immersed in sulfuric acid solution with pH=1.0 for 48 d,and its apparent damage,compressive strength,mass loss and neutralization depth were used as sulfuric acid resistance performance indexes.The effects of different dosages of graphene oxide(0.01%,0.03%,0.05%)on the corrosion resistance of concrete were studied.In addition,the modification effect of graphene oxide was analyzed by SEM,XRD and FTIR.Studies have shown that the incorporation of a small amount of graphene oxide can significantly improve the sulfuric acid resistance of concrete,but the modification effect gradually weakens with the increase of the content.The compressive strength of the modified concrete increased by 56.0%,17.0%and 6.0%,respectively,and it was still better than that of the unmodified concrete after 48 d of sulfuric acid corrosion.After 48 d,the concrete with 0.05wt%content showed the maximum mass loss and neutralization depth,and the poor interfacial transition zone and more loose corrosion products in the SEM figure,which represented the worst modification effect.Based on the macro performance,XRD and FTIR analysis,it was determined that the geopolymer recycled concrete with 0.01%graphene oxide had the best sulfuric acid corrosion resistance.
作者
刘新宇
刘惠
王新杰
朱平华
陈春红
周心磊
LIU Xinyu;LIU Hui;WANG Xinjie;ZHU Pinghua;CHEN Chunhong;ZHOU Xinlei(School of Environmental Science and Engineering,Changzhou University,Changzhou 213164,Jiangsu,China;School of Urban Construction,Changzhou University,Changzhou 213164,Jiangsu,China)
出处
《材料导报》
CSCD
北大核心
2023年第21期144-149,共6页
Materials Reports
基金
国家自然科学基金(52008046)
江苏省研究生科研实践创新计划(SJCX22_1398)。
关键词
地聚物再生混凝土
氧化石墨烯
硫酸溶蚀
抗压强度
geopolymers recycled concrete
graphene oxide
sulphuric acid erosion
compressive strength
