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Effect of Different Dispersants in Compressive Strength of Carbon Fiber Cementitious Composites

机译：不同分散剂在碳纤维水泥复合材料抗压强度的影响

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Carbon Fiber Cementitious Composites (CFCC) is one of the most important materials in smart concrete applications. CFCC should be able to have the piezoresistivity properties where its resistivity changes when there is applied a stress/strain. It must also have the compressive strength qualification. One of the important additives in carbon fiber cementitious composites is dispersant. Dispersion of carbon fiber is one of the key problems in fabricating piezoresistive carbon fiber cementitious composites. In this research, the uses of dispersants are methylcellulose, mixture of defoamer and methylcellulose and superplasticizer based polycarboxylate. The preparation of composite samples is similar as in the mortar technique according to the ASTM C 109/109M standard. The additives material are PAN type carbon fibers, methylcellulose, defoamer and superplasticizer (as water reducer and dispersant). The experimental testing conducts the compressive strength and resistivity at various curing time, i.e. 3, 7 and 28 days. The results obtained that the highest compressive strength value in is for the mortar using superplasticizer based polycarboxylate dispersant. This also shown that the distribution of carbon fiber with superplasticizer is more effective, since not reacting with the cementitious material which was different from the methylcellulose that creates the cement hydration reaction. The research also found that the CFCC require the proper water cement ratio otherwise the compressive strength becomes lower.
机译：碳纤维水泥复合材料（CFCC）是智能混凝土应用中最重要的材料之一。 CFCC应该能够在施加应力/应变时具有压阻性性能，其中其电阻率变化。它还必须具有压缩强度资格。碳纤维水泥复合材料中的重要添加剂之一是分散剂。碳纤维的分散是制造压阻碳纤维水泥复合材料的关键问题之一。在该研究中，分散剂的用途是甲基纤维素，消泡剂和甲基纤维素的混合物和基于超塑化剂的多元羧酸酯。根据ASTM C 109 / 109M标准，复合样品的制备与砂浆技术相似。添加剂材料是泛型碳纤维，甲基纤维素，消泡剂和超塑化剂（作为排水剂和分散剂）。实验测试在各种固化时间内进行抗压强度和电阻率，即3,7和28天。结果获得了使用基于过度塑化剂的多羧酸盐分散剂的砂浆的最高压缩强度值。这还表明，具有超增塑性剂的碳纤维的分布更有效，因为没有与水泥材料不同于产生水泥水化反应的甲基纤维素的反应。该研究还发现CFCC需要适当的水水泥比，否则抗压强度变低。

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