哈尔滨工程大学学报2023，Vol.55Issue(10)：1805-1813,9.DOI:10.11990/jheu.202112052
炭黑与钢纤维对混凝土裂缝自监测性能的影响
Effect of carbon black and steel fibers on the concrete crack self-monitoring performance
摘要
Abstract
In this paper,an experimental study was conducted on smart concrete mixed with carbon black(CB)and steel fibers(SF)to study the influence of conductivity on the self-monitoring performance of concrete cracks.We used the four-probe method to analyze the fractional change in resistance(FCR)of the specimen under bending load,after which we investigated the effect of different steel fiber contents on flexural performance and self-monitoring performance.Results revealed that the flexural performance of specimens was significantly improved with the addition of structural steel fibers.The time of the occurrence of a crack in specimens can be monitored in real time according to the load-fractional change in the resistance-time(Load-FCR-Time)curve.On the basis of the FCR-crack propagation displacement(FCR-COD)curve obtained from the experiment,it was observed that FCR increased with the increase of COD,the slope of the curve gradually decreased in the FCR-COD curve,and the logarithmic function fitted well with the FCR-COD curve.In the Gauge factor-COD(G-COD)curve,the value of G decreased gradually with the increase of steel fiber content.Similarly,the reduction amplitude decreased gradually under the same COD.Finally,the smart concrete self-monitoring performance was analyzed based on the conductive mechanism and the software COMSOL.关键词
钢纤维/智能混凝土/电阻变化率/裂缝自监测/灵敏度系数/数值模拟/纤维混凝土/炭黑Key words
steel fiber/smart concrete/fractional change in resistance/crack self-monitoring/sensitivity coefficient/numerical simulation/concrete with fibers/carbon black分类
建筑与水利引用本文复制引用
丁一宁,晏楚,柳根金,谢昊威,宋世德..炭黑与钢纤维对混凝土裂缝自监测性能的影响[J].哈尔滨工程大学学报,2023,55(10):1805-1813,9.基金项目
浙江省自然科学基金项目(LQ22E080024). （LQ22E080024）
