4.1 Article

The Characteristics of CNT/Cement Composites with Acid-Treated MWCNTs

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Publisher

HINDAWI LTD
DOI: 10.1155/2015/308725

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Funding

  1. Regional Development Research Program - Ministry of Land, Infrastructure and Transport of Korean government [14RDRP-B076268]
  2. National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2012R1A1A1010626]
  3. National Research Foundation of Korea [2012R1A1A1010626] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study investigated the effects of acid-treated MWCNTs on the workability, compressive and tensile strength, porosity, and microstructure of CNT/cement composites. While workability decreased with acid treatment of CNTs, compressive and tensile strength improved significantly. Strength was also enhanced by using acid-treated CNTs alone, compared to using a surfactant with acid-treated CNTs. MIP analysis revealed that the porosity decreases from using acid-treated CNTs and that using acid-treated CNTs without a surfactant was more effective in reducing the size of micropores. A SEM analysis revealed improved CNT dispersion and dense hydration products in cement composites containing acid-treated CNTs. Ultimately, the use of acid-treated CNTs improved the CNT dispersion within CNT/cement composites, enhanced the pore structure, and formed denser hydration products around CNTs.

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