This paper presents the initial results of a two-phase research project for developing re-centring self-sensing cementitious composites. The focus here is on fresh, mechanical, and electrical properties of the developed cementitious composites. Shape memory alloy (SMA) fibres and carbon fibres were used in this study. The performance of composites was studied based on the slump test, four-point bending test, flexural toughness, compression test, direct tensile test, and electrical conductivity test. The performance of SMA-reinforced self-compacting cementitious composites (SMA-FRSCC) was also compared with their steel fibre-reinforced counterparts (SFRSCC). The addition of SMA and steel fibres slightly decreased the relative slump while carbon fibres reduced the flowability of mixture significantly. The increase in SMA and steel fibre content enhanced the flexural and tensile post-peak performance of composite, especially for specimens containing 1%–1.5% fibres by volume. Compressive strength was observed to decrease slightly by using SMA and steel fibres up to 1%, after which a reverse trend was detected. Adding SMA and steel fibres up to 1.5% did not affect the conductivity of composite considerably. On the contrast, carbon fibres even at low content (i.e., 0.1%) increased the conductivity of the composite substantially. The percolation transition zone detected for carbon fibre reinforced cementitious composites (CFRCC) showed an optimum carbon fibre dosage of 0.3% in terms of electrical conductivity.

本文介绍了开发重心自感水泥基复合材料的两阶段研究项目的初步结果。这里的重点是开发的水泥基复合材料的新鲜，机械和电气性能。在这项研究中使用了形状记忆合金（SMA）纤维和碳纤维。基于坍落度试验，四点弯曲试验，弯曲韧性，压缩试验，直接拉伸试验和电导率试验研究了复合材料的性能。还比较了SMA增强的自压缩水泥复合材料（SMA-FRSCC）和其钢纤维增强的复合材料（SFRSCC）的性能。SMA和钢纤维的加入会稍微降低相对坍落度，而碳纤维会显着降低混合物的流动性。SMA和钢纤维含量的增加增强了复合材料的峰后抗弯性能和拉伸性能，特别是对于含有1％–1.5％纤维的样品。使用SMA和钢纤维达到1％，可观察到抗压强度略有下降，此后发现了相反的趋势。最高添加1.5％的SMA和钢纤维不会明显影响复合材料的电导率。相反，碳纤维即使在低含量（即0.1％）下也显着提高了复合材料的电导率。碳纤维增强水泥基复合材料（CFRCC）的渗透过渡区显示出最佳碳纤维用量（电导率）为0.3％。使用SMA和钢纤维达到1％，可观察到抗压强度略有下降，此后发现了相反的趋势。最高添加1.5％的SMA和钢纤维不会明显影响复合材料的电导率。相反，碳纤维即使在低含量（即0.1％）下也显着提高了复合材料的电导率。碳纤维增强水泥基复合材料（CFRCC）的渗透过渡区显示出最佳碳纤维用量（电导率）为0.3％。使用SMA和钢纤维达到1％，可观察到抗压强度略有下降，此后发现了相反的趋势。最高添加1.5％的SMA和钢纤维不会显着影响复合材料的电导率。相反，即使在低含量（即0.1％）下的碳纤维也显着提高了复合材料的电导率。碳纤维增强水泥基复合材料（CFRCC）的渗透过渡区显示出最佳碳纤维用量（电导率）为0.3％。1％）大大提高了复合材料的电导率。碳纤维增强水泥基复合材料（CFRCC）的渗透过渡区显示出最佳碳纤维用量（电导率）为0.3％。1％）大大提高了复合材料的电导率。碳纤维增强水泥基复合材料（CFRCC）的渗透过渡区显示出最佳碳纤维用量（电导率）为0.3％。