钢纤维水泥基材料界面过渡区逾渗行为  

Percolation behavior of interfacial transition zone in steel fiber reinforced cement-based materials

作　　者：慕儒 马师禹 卿龙邦 李明祺 Mu Ru;Ma Shiyu;Qing Longbang;Li Mingqi(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300131,China)

机构地区：[1]河北工业大学土木与交通学院,天津300131

出　　处：《东南大学学报（自然科学版）》2024年第6期1404-1410,共7页Journal of Southeast University：Natural Science Edition

基　　金：天津市教委科研计划资助项目(2022KJ100)。

摘　　要：为探究钢纤维水泥基材料中界面过渡区(ITZ)的逾渗行为,采用贴合实际的超卵球和超椭球构造了骨料和钢纤维粒子,构建了钢纤维水泥基材料硬核-软壳粒子堆积模型,研究了骨料形状、ITZ厚度、钢纤维掺量及钢纤维形状对ITZ逾渗阈值的影响,建立了ITZ逾渗阈值预测模型,并通过与现有文献数值模拟的比较验证了模型的可靠性.结果表明:当骨料的方度参数由1增长至5时,ITZ逾渗阈值降低约10%;当纤维掺量由0增至1.0%时,ITZ逾渗阈值降低约40%;当ITZ厚度由0.10 mm降低至0.05 mm时,ITZ逾渗阈值提高约80%;随着骨料和钢纤维的比表面积、ITZ厚度和钢纤维掺量的增大,ITZ之间更易发生连通,进而导致ITZ逾渗阈值不断降低.To investigate the percolation behavior of interfacial transition zone(ITZ)in steel fiber reinforced cement-based materials,the aggregate and steel fiber particles are constructed using the actual superovoids and superellipsoids,a hard core-soft shell particle packing model for steel fiber reinforced cement-based materials is constructed,and the influences of aggregate shape,ITZ thickness,steel fiber content and steel fiber morphology on the ITZ percolation threshold are studied.ITZ percolation threshold prediction model is established,and the reliability of the model is verified by comparing with the numerical simulation in the literature.The results indicate that the ITZ percolation threshold decreases by about 10%when the square parameter of aggregate increases from 1 to 5;the ITZ percolation threshold decreases by about 40%when the fiber content increases from 0 to 1.0%;the ITZ percolation threshold increases by about 80%when the ITZ thickness is reduced from 0.10 mm to 0.05 mm;the percolation threshold of ITZ decreases with enlarging specific surface area of aggregates and steel fibers,ITZ thickness,and steel fiber content,which can be explained by the more easily connection between ITZ.

关 键 词：钢纤维水泥基材料 界面过渡区 粒子堆积 逾渗 

分 类 号：TU528.572[建筑科学—建筑技术科学]