Pore structure and chloride permeability of concrete containing nano-particles for pavement
Pore structure and chloride permeability of concrete containing nano-particles for pavement
复制标题
纳米颗粒路面混凝土的孔结构及氯离子渗透性
DOI：
10.1016/j.conbuildmat.2010.07.032
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发表时间：
2011-02-01
影响因子：
7.4
通讯作者：
Li, Hui
中科院分区：
文献类型：
--
作者：
Zhang, Mao-hua;Li, Hui
试验研究了含有纳米颗粒(TiO（2)和SiO(2)）的路面混凝土的孔隙结构和氯离子渗透性，并与普通混凝土、含聚丙烯（PP）纤维混凝土和同时含有纳米TiO(2)和PP纤维的混凝土进行了比较。试验结果表明，纳米颗粒的加入细化了混凝土的孔隙结构，增强了混凝土抗氯离子渗透的能力。随着纳米颗粒掺入量的减少，混凝土孔隙结构的细化程度和抗氯离子渗透能力的增强程度均有所增加。含有纳米tio(2)的混凝土的孔隙结构和抗氯离子渗透性能优于含有相同量纳米sio(2)的混凝土。但对于含有PP纤维的混凝土，孔隙结构变粗，抗氯离子渗透能力降低。PP纤维含量越大，混凝土孔隙结构越粗，抗氯化物渗透能力越低。对于同时含有纳米tio(2)和PP纤维的混凝土，其孔隙结构比仅含有相同量PP纤维的混凝土更粗，抗氯离子渗透能力更低。氯离子渗透性与混凝土抗压强度呈双曲线关系。氯离子渗透率与混凝土孔隙结构之间存在明显的线性关系。(C) 2010 Elsevier Ltd.版权所有。
Pore structure and chloride permeability of concrete containing nano-particles (TiO(2) and SiO(2)) for pavement are experimentally studied and compared with that of plain concrete, concrete containing polypropylene (PP) fibers and concrete containing both nano-TiO(2) and PP fibers. The test results indicate that the addition of nano-particles refines the pore structure of concrete and enhances the resistance to chloride penetration of concrete. The refined extent of pore structure and the enhanced extent of the resistance to chloride penetration of concrete are increased with the decreasing content of nano-particles. The pore structure and the resistance to chloride penetration of concrete containing nano-TiO(2) are superior to that of concrete containing the same amount of nano-SiO(2). However, for the concrete containing PP fibers, the pore structure is coarsened and the resistance to chloride penetration is reduced. The larger the content of PP fibers, the coarser the pore structure of concrete, and the lower the resistance to chloride penetration. For the concrete containing both nano-TiO(2) and PP fibers, the pore structure is coarser and the resistance to chloride penetration is lower than that of concrete containing the same amount of PP fibers only. A hyperbolic relationship between chloride permeability and compressive strength of concrete is exhibited. There is an obvious linear relationship between chloride permeability and pore structure of concrete. (C) 2010 Elsevier Ltd. All rights reserved.