Graphene nanoplatelets as an effective additive to tune the microstructures and piezoresistive properties of cement-based composites
Graphene nanoplatelets as an effective additive to tune the microstructures and piezoresistive properties of cement-based composites
复制标题
石墨烯纳米片作为调节水泥基复合材料微观结构和压阻性能的有效添加剂
DOI：
10.1016/j.conbuildmat.2019.03.173
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发表时间：
2019-06-10
影响因子：
7.4
通讯作者：
Zeng, Qiang
中科院分区：
文献类型：
--
作者：
Tao, Jin;Wang, Xiaohu;Zeng, Qiang
压阻式水泥基复合材料作为一种自感知材料，是智能建筑发展的迫切需求。在此，研究了石墨烯纳米片（GNPs）对水泥砂浆的孔隙结构、微观结构、力学性能和压阻性能的影响。采用四探针法定量评估了循环压缩下石墨烯纳米片改性水泥砂浆的压阻性能。结果表明，在水泥砂浆中适量掺入石墨烯纳米片可以使微观结构致密化并提高力学性能。电导率随石墨烯纳米片含量的变化遵循渗流规律。压阻反应的程度和速率与石墨烯纳米片含量和加载水平没有简单的相关性。压阻反应的机制与石墨烯纳米片和材料基体之间的弹性变形和界面电导有关。然而，界面电导仅在适量的石墨烯纳米片含量时起作用。本研究的结果和发现可能为未来水泥基压阻复合材料在开发自健康监测建筑和基础设施中的应用铺平广阔的道路。（C）2019爱思唯尔有限公司。保留所有权利。
Piezoresistive cement-based composites, as a type of self-sensing materials, are urgently needed for developing smart buildings. Herein the effect of graphene nanoplatelets (GNPs) on the pore structure, microstructure, mechanical and piezoresistive properties of cement mortar was investigated. A four-probe method was used to quantitatively assess the piezoresistive properties of the GNP-modified cement mortars under cyclic compressions. Results show that appropriate incorporations of GNPs in cement mortars can densify the microstructure and enhance the mechanical properties. The changes in electric conductivity against GNP content follow a percolation regime. The extents and rates of piezoresistive reactions have no simple correlations with GNP contents and loading levels. The mechanisms of piezoresistive reaction are associated with the elastic deformation and interfacial conductance between GNPs and material matrix. However, the interfacial conductance only works in moderate GNP contents. The results and findings of this study may pave a wide path for the uses of cement-based piezoresistive composites in developing self-health monitoring buildings and infrastructures in the future. (C) 2019 Elsevier Ltd. All rights reserved.