对普通混凝土、玻璃纤维增强混凝土、玄武岩纤维增强混凝土在碳化环境下进行了氯离子渗透试验。对比分析了不同碳化周期,3组混凝土碳化深度以及孔隙度的变化,进一步研究了碳化周期与纤维的掺入对混凝土抗氯离子侵蚀性能的影响,并通过扫描电镜观察了其微观结构。结果分析表明:掺入玻璃纤维和玄武岩纤维提高了混凝土的抗碳化性能,并且玄武岩纤维增强混凝土的抗碳化性能不受碳化周期的影响;碳化反应提高了混凝土抗氯离子渗透性能;碳化过程中纤维的掺入改善了混凝土的孔径分布,玻璃纤维与玄武岩纤维都能够提高混凝土的抗氯离子渗透性能;纤维使得混凝土微观结构更加致密。
The rapid chloride penetrating test of ordinary Portland concrete (OPC), glass rider relniorced concrete (GFRC) and basalt fiber reinforced concrete (BFRC) were carried out under carbonization environment. The changes of carbonization depth and porosity in three groups of concrete of different carbonation age, the effect of carbonation age and fiber on chloride ion penetration resistance of concrete were studied, and the microstructure was observed by scanning electron microscope (SEM). Results show that glass and basalt fiber improved carbonization resistance of concrete,and carbonation age had no effect on the carbonation resistance of BFRC; carbonation reaction enhanced the chloride-ion penetration resistance of concrete; fiber improved the pore size distribution, both glass fiber and basalt fiber can improve the resistance to chloride-ion penetration of concrete; fiber made the microstrueture more compact.