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

Journal of Wuhan University of Technology(Materials Science) 2022年第1期37卷 47-57页

作者： Qareeb Ullah rao arsalan khushnood Sajjad Ahmad Muhammad Usman Shad Muhammad Jean-Marc Tulliani School of Civil and Environmental Engineering National University of Sciences and TechnologyIslamabad-44000Pakistan Department of Structural Geotechnical and Building EngineeringPolitecnico di TorinoTurin-10129Italy Department of Civil Engineering FE&TBahauddin Zakariya UniversityMultan-56000Pakistan Department of Applied Science and Technology Politecnico di TorinoTurin-10129Italy

An efficient and promising approach for effectively dispersing multi-walled carbon nanotubes(MWCNTs)in cementitious composites has been *** 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 *** the initial phase of investigation,ideal surfactant’s content required for efficient dispersion of MWCNTs in solution was determined using ultra-violet *** 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 *** was observed that the natural surfactant produced efficient dispersion at much reduced cost(approx.14%)compared with the commercial *** 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 *** strength enhancement,the dispersed MWCNTs also improved the first crack and ultimate fracture toughness by 51.5%and 35.9%,*** 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 ***,the proposed scheme significantly reduced the early age volumetric shrinkage by 39%.

关键词： MWCNTs acacia nilotica gum keekar triton X-100 fracture crack bridging cement mortar early age micro-cracking sustainability

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

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Frontiers of Structural and Civil Engineering 2016年第2期10卷 209-213页

作者： rao arsalan khushnood Sajjad AHMAD Luciana RESTUCCIA Consuelo SPOTO Pravin JAGDALE Jean-Marc TULLIANI Giuseppe Andrea FERRO Department of StructuraL Geotechnical and Building Engineering(DISEG) Politecnico di Torino10129 TorinoItaly Nust Institute of Civil Engineering(NICE) National University of Sciences and Technology(NUST)44000 IslamabadPakistan Mirpur University of Science and Technology(MUST) 10250 MirpurAzad KashmirPakistan Department of Applied Science and Technology(DISAT) Politecnico di Torino10129 TorinoItaly

In the present work, carbon nano/microparticles obtained by controlled pyrolysis of peanut （PS） and hazelnut （HS） shells are presented. These materials were characterized by Raman spectroscopy and field emissionscanning electron microscopy （FE-SEM）. When added to cement paste, up to 1 wt%, these materials led to an increase of the cement matrix flexural strength and of toughness. Moreover, with respect to plain cement, the total increase in electromagnetic radiation shielding effect when adding 0.5 wt% of PS or HS in cement composites is much higher in comparison to the ones reported in the literature for CNTs used in the same content.

关键词： carbon nano/microparticles green cement toughness mechanism electromagnetic shielding effect

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