玄武岩纤维改善再生混凝土抗氯离子渗透性能研究  

Improving Chloride Ion Penetration Resistance of Recycled Concrete by Basalt Fiber

作　　者：魏康 李犇 孙峤[1] WEI Kang;LI Ben;SUN Qiao(College of Architectural Engineering,Dalian University,Dalian 116622,China;School of Transportation,Civil Engineering&Architecture,Foshan University,Foshan 528000,China)

机构地区：[1]大连大学建筑工程学院,大连116622 [2]佛山科学技术学院交通与土木建筑学院,佛山528000

出　　处：《硅酸盐通报》2022年第5期1656-1662,共7页Bulletin of the Chinese Ceramic Society

基　　金：中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金(SKLGDUEK1926);广东省教育厅高校科研项目(2021KQNCX083);广东省科技研发专项(GDKTP2020032800);大连大学大学生创新创业训练计划项目(202111258422)。

摘　　要：为研究玄武岩纤维对再生混凝土抗氯离子渗透性能的影响,本文对4种玄武岩纤维体积掺量(0%、0.2%、0.4%、0.6%)下5个粗骨料质量替代率(20%、40%、50%、60%、80%)的再生混凝土及1组普通混凝土进行了电通量试验,并利用傅里叶变换红外光谱(FTIR)和压汞法(MIP)从水泥水化和孔结构的角度探究了玄武岩纤维对再生混凝土抗氯离子渗透性能影响的微观机理。结果表明,玄武岩纤维显著提高了再生混凝土抗氯离子渗透性能,其中玄武岩纤维掺量为0.2%,粗骨料质量替代率为50%时改善效果最好且优于普通混凝土。基于FTIR发现玄武岩纤维是通过改变再生混凝土水化产物C-S-H的聚合度和CaCO_(3)的生成而改善其抗氯离子渗透性能。通过MIP得出最优组合掺量下,再生混凝土的孔径分布得到优化,孔隙率最小,进而提高了其抗氯离子渗透性能。In order to study the effect of basalt fiber on the chloride ion penetration resistance of recycled concrete,the electric flux test of recycled concrete with five coarse aggregate mass replacement rates(20%,40%,50%,60%,80%)under the volume content of four kinds of basalt fibers(0%,0.2%,0.4%,0.6%),and ordinary concrete were carried out.The microscopic mechanism of the effect of basalt fiber on the chloride ion penetration resistance of recycled concrete was studied from the perspective of cement hydration and pore structure by fourier transform infrared spectroscopy(FTIR)and mercury injection method(MIP).The results show that the addition of basalt fiber greatly increases the chloride ion penetration resistance recycled concrete.The combination of basalt fiber content of 0.2%and coarse aggregate replacement rate of 50%achieve the best chloride ion penetration resistance,even better than ordinary concrete.Based on FTIR,it is found that basalt fiber improves its chloride ion penetration resistance by changing the polymerization degree of hydration product C-S-H and the formation of CaCO_(3) of recycled concrete.Based on MIP,it is found that under the best combined dosage,the pore size distribution of recycled concrete is optimized,the porosity is the smallest,and its chloride ion penetration resistance is improved.

关 键 词：玄武岩纤维 氯离子渗透 再生混凝土 微观机理 压汞法 电通量 

分 类 号：TU528[建筑科学—建筑技术科学]