玄武岩纤维对再生混凝土抗碳化性能的影响  

Influence of basalt fiber on the anti-carbonation performance of recycled aggregate concrete

作　　者：丁亚红[1] 郭书奇 张向冈[1,2] 徐平 武军[1] 张美香[1] DING Yahong;GUO Shuqi;ZHANG Xianggang;XU Ping;WU Jun;ZHANG Meixiang(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Henan Key Laboratory of Special Protective Materials,Luoyang 471023,China)

机构地区：[1]河南理工大学土木工程学院,焦作454000 [2]河南省特种防护材料重点实验室,洛阳471023

出　　处：《复合材料学报》2022年第3期1228-1238,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(U1904188);河南省重点研发与推广专项(212102310288);河南省特种防护材料重点实验室开放课题(SZKFJJ202004);河南省高校基本科研业务费专项(NSFRF200320)。

摘　　要：采用快速碳化的方法研究了玄武岩纤维(BF)掺量和再生粗骨料(RCA)取代率对再生混凝土(RAC)抗碳化性能的影响,实测了3天、7天、14天、28天的碳化深度,对随碳化天数的增加,碳化深度与BF掺量、RCA取代率之间的关系进行了分析。结果表明,RAC的碳化与天然混凝土(NAC)类似,其碳化深度均随碳化天数的增加而增加,随着RCA取代率的增加,RAC的碳化深度先降后增,当RCA的质量取代率为50%时,RAC的抗碳化性能最佳,掺入BF可以有效地提高RAC的抗碳化性能,随着BF掺量的增加,RAC的抗碳化性能先增后减,最佳掺量为2 kg/m^(3)。另外,采用扫描电子显微镜对BF/RAC的微观结构进行观测,结合扩散理论,揭示了碳化损伤机制。利用试验数据进行拟合,建立了BF/RAC的碳化深度模型。研究成果对今后开展BF/RAC抗碳化性能的研究及工程应用具有一定的参考价值。The rapid carbonization method was used to study the influence of basalt fiber(BF)content and recycled coarse aggregate(RCA)replacement ratio on the anti-carbonization performance of recycled aggregate concrete(RAC).The carbonization depth of 3 days,7 days,14 days and 28 days was measured,and the relationship between carbonization depth with BF content and replacement ratio of RCA was analyzed with the increase of carbonization days.The results show that the carbonization of RAC is similar to that of natural aggregate concrete(NAC).The depth of carbonization increases with the increase of carbonization days.As the replacement ratio of RCA increases,the carbonization depth of RAC first decreases and then increases,when the RCA mass replacement ratio is 50%,the carbonization resistance of RAC is the best.Incorporating BF can effectively improve the anticarbonization performance of RAC.With the increase of BF content,the anti-carbonization performance of RAC increases first and then decreases.In this experiment,the optimal content of RAC is 2 kg/m^(3).In addition,using scanning electron microscope to observe the microstructure of BF/RAC,combined with diffusion theory,the carbonization damage mechanism was revealed.Using test data for fitting,a carbonization depth model of BF/RAC was established.The research results have reference value for future research and engineering applications.

关 键 词：再生混凝土 玄武岩纤维 碳化深度 微观结构 碳化模型 

分 类 号：TV431.3[水利工程—水工结构工程]