Effect of styrene-butadiene rubber on the electrical properties of carbon black/cement mortar

作者：Li Gengying^*; Wang Lei; Leung Christopher; Hu Ranxiong; Zhao Xiaohua; Yan Biao; Zhou Jingguo

来源：RSC Advances, 2015, 5(86): 70229-70237.

DOI：10.1039/c5ra11688k

The piezoresistivity of carbon black/cement mortar (CB/PC) makes it a potential candidate for the development of smart structures with sensing capability. To ensure reliable sensing results in different environments, a hydrophobic styrene-butadiene rubber (SBR) was incorporated to reduce the effect of moisture on the piezoresistivity. The influence of SBR content (0, 5, 10 and 15 wt%) on the electric conductivity and piezoresistivity of SBR/CB/PC mortar with different moisture content was experimentally studied. Results indicate that the electric conductivity and piezoresistivity effect of SBR/CB/PC mortars increase with increasing SBR content. Also, compared to pure CB/PC mortars, the electrical properties of SBR/CB/PC mortars were significantly less sensitive to the variation of moisture. Under cyclic loading, both positive (PP) and negative piezoresistivity (NP) are found to occur in SBR/CB/PC mortars. This behavior can be explained in terms of a mechanism with both the tunneling effect and capacitance effect between CB particles during compression.

• 单位
  香港科技大学; 汕头大学