导电水泥基复合材料的制备与性能研究

发布时间：2018-07-15 09:15

【摘要】：导电水泥基复合材料是在水泥基复合材料的基础上加入导电组分,使其拥有导电特性,并保持普通水泥基复合材料绝大部分性能及技术上优势。导电水泥基复合材料必将作为一种智能材料,在众多领域有着广阔而潜在的应用前景。因此,开展导电水泥基复合材料的研究是目前的一项重要课题。本文通过制备导电水泥胶砂和导电水泥混凝土两种水泥基复合材料,探究了导电组分的种类与掺量、导电组分的单掺与双掺、掺合料的种类与掺量、养护龄期等因素对导电水泥基复合材料性能的影响规律。具体研究包括导电水泥基复合材料的电学性能、力学性能及耐久性,并通过超声波、交流阻抗及微观结构对其电学性能、力学性能及耐久性的机理进行了探讨。试验结果表明,单掺多壁碳纳米管、碳纤维或镀铜钢纤维对水泥基复合材料的电学性能和力学性能均有改善;碳纳米管对水泥基复合材料电学性能改善最为显著,其次是碳纤维,且碳纳米管的最佳掺量为0.3%,碳纤维的最佳掺量为0.3%;钢纤维对水泥基复合材料的力学性能改善最为显著,其次是碳纳米管和碳纤维,钢纤维的最佳掺量为0.4%;双掺碳纳米管-碳纤维与碳纳米管-钢纤维对水泥基复合材料的电学性能和力学性能的影响好于单掺;碳纳米管-碳纤维的双掺效果好于碳纳米管-钢纤维,且碳纳米管与碳纤维的最佳双掺比例为0.2%与0.3%;硅灰、粉煤灰及矿粉三种掺合料对导电水泥基复合材料的电学性能改善明显,对力学性能改善一般;矿粉对导电水泥基复合材料电学性能改善效果最佳,粉煤灰次之,且两者的最佳掺量均为20%;通过混凝土抗硫酸盐试验和碳化试验可知,导电组分的掺入使混凝土抗硫酸盐能力略有提高,抗碳化能力略有降低。
[Abstract]:Conductive cement-based composites are based on cement-based composites by adding conductive components to make them have conductive properties and maintain most of the properties and technical advantages of ordinary cement-based composites. Conductive cement matrix composites will be a kind of intelligent materials and will have a broad and potential application prospect in many fields. Therefore, the research of conductive cement-based composites is an important subject at present. In this paper, two kinds of cement-based composites, conductive cement sand and conductive cement concrete, were prepared. The kinds and contents of conductive components, the single and double admixtures of conductive components, the kinds and contents of admixtures were investigated. The influence of curing age on the properties of conductive cement matrix composites. The electrical properties, mechanical properties and durability of conductive cement matrix composites are studied in detail. The mechanism of electrical properties, mechanical properties and durability of the composites are discussed by ultrasonic wave, AC impedance and microstructure. The experimental results show that the electrical and mechanical properties of cement-based composites are improved by single doped multi-wall carbon nanotubes, carbon fiber or copper-plated steel fibers, while the electrical properties of cement-based composites are improved most significantly by carbon nanotubes. The second is carbon fiber, and the best content of carbon nanotube is 0.3, and the best amount of carbon fiber is 0.3. The mechanical properties of cement matrix composite are improved most obviously by steel fiber, and the second is carbon nanotube and carbon fiber. The optimum content of steel fiber is 0.4. The effect of carbon nanotube-carbon fiber and carbon nanotube-steel fiber on the electrical and mechanical properties of cement-based composites is better than that of single-doped carbon nanotubes. The effect of carbon nanotube-carbon fiber is better than that of carbon nanotube steel fiber, and the optimum ratio of carbon nanotube to carbon fiber is 0.2% to 0.3%. The electrical properties and mechanical properties of conductive cement matrix composites were improved obviously by fly ash and mineral powder, and the electrical properties of conductive cement matrix composites were improved best by mineral powder, followed by fly ash. The optimum content of both of them is 20. Through the experiments of resisting sulfate and carbonization of concrete, it can be seen that the ability of resisting sulphate of concrete is slightly improved and the ability of resisting carbonation is slightly reduced by the addition of conductive component.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33

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