Performance Evaluation of MWCNTs Reinforced Cement Mortar Composites using Natural and Commercial Surfactants

An efficient and promising approach for effectively dispersing multi-walled carbon nanotubes(MWCNTs)in cementitious composites has been investigated.The naturally occurring organic extracts from species of indigenously known‘Keekar’trees scattered along tropical and sub-tropical regions;is found as an exceptional replacement to the non-natural commercial surfactants.In the initial phase of investigation,ideal surfactant’s content required for efficient dispersion of MWCNTs in solution was determined using ultra-violet spectroscopy.The experimental investigations were then extended to five different cement composite formulations containing 0.0,0.025,0.05,0.08 and 0.10%MWCNTs by weight of cement.It was observed that the natural surfactant produced efficient dispersion at much reduced cost(approx.14%)compared with the commercial alternate.The estimated weight efficiency factor f was found 6.5 times higher for the proposed sustainable replacement to the conventional along with remarkable increase of 23%in modulus of rupture on 0.08 wt%addition of MWCNTs.Besides strength enhancement,the dispersed MWCNTs also improved the first crack and ultimate fracture toughness by 51.5%and 35.9%,respectively.The field emission scanning electron microscopy of the cryofractured samples revealed efficient dispersion of MWCNTs in the matrix leading to the phenomenon of effective crack bridging and crack branching in the composite matrix.Furthermore,the proposed scheme significantly reduced the early age volumetric shrinkage by 39%.

Carbonized nano/microparticles for enhanced mechanical properties and electromagnetic interference shielding of cementitious materials

在现在的工作，碳 nano/microparticles 由花生(PS ) 的控制热分解获得了，榛子(HS ) 壳被介绍。这些材料被拉曼光谱学和地 emissionscanning 电子显微镜学(FE-SEM ) 描绘。当增加了水泥浆糊时，直到 1 wt% ，这些材料导致了水泥矩阵的增加曲折力量并且坚韧。而且关于平凡水泥，当在水泥 composites 增加 PS 或 HS 的 0.5 wt% 与相比是高得多的时，防护效果的电磁的放射的全部的增加为 CNT 在文学报导了，在一样的内容使用。