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配合使用超声波处理、组合紫外光(UV)照射与Fenton试剂表面修饰CNT,然后单独用聚羧酸减水剂(MPEG)和组合曲拉通(Tx100)将CNT进一步有效分散于水泥基体中制成CNT增强水泥复合材料(CNTRC)。采用四电极法测试在压应力作用下CNTRC的电导率变化规律,探讨其压阻传感性能。FTIR结果表明,Fenton/UV处理后CNT表面很好地嵌上羧基和羟基等亲水基团;材料电阻率及压阻性能结果显示,CNTRC的电阻率与灵敏度随CNT掺量增加而均有一定程度的增加;相比于仅添加MPEG,MPEG&Tx100组合分散CNT的CNTRC电阻率更低、应变感知灵敏度更高,相应CNT在水泥基中的分散性更佳,CNTRC的电导率变化率与应变灵敏度最高分别达-0.389、145。
(CNTs) were surface-modified by UV irradiation and Fenton’s reagent, and then CNTs were further efficiently dispersed in the cement matrix by polycarboxylic acid water reducer (MPEG) and combination of Triton (Tx100) alone. CNT reinforced cementitious composites (CNTRC). The four-electrode method was used to test the conductivity of CNTRC under compressive stress and the piezoresistive sensing performance was discussed. The results of FTIR showed that the surface of CNTs was well embedded with hydrophilic groups such as carboxyl group and hydroxyl group after Fenton / UV treatment. The results of material resistivity and piezoresistive performance showed that the resistivity and sensitivity of CNTRC increased with the increase of CNT content Compared with the addition of only MPEG, the combination of MPEG and Tx100 CNTRC dispersion CNT CNTs lower resistivity, higher strain sensing sensitivity, the corresponding dispersion of CNT in cement-based better, CNTRC conductivity and strain sensitivity of the highest sensitivity Respectively up to -0.389,145.