Improvement of Early Compressive Strength in Belite Cement by Incorporating Silica Coated Single-Walled Carbon Nanotubes

Abstract:

This work demonstrated the improvement of belite cement compressive strength by incorporating nanosilica coated single-walled carbon nanotubes (SWNTs@SiO₂) into the cement paste. The structure and chemical compositions of SWNTs@SiO₂ materials were characterized by transmission electron microscopy and energy dispersive X-ray spectroscopy techniques, respectively. Belite cement composites were prepared by mixing belite cement paste with different loadings of SWNTs@SiO₂ ranging from 0.02 – 0.1 wt%. In order to measure the early strength of cement composites, the samples were aged for 7 days, and then subjected to compression tests. Effects of uncoated SWNTs and silica coated SWNTs loadings on the compressive strength of belite cement composites were studied. Without pre-coating SWNTs with nanosilica, the SWNTs additives led to large decrease in compressive strength of belite cement composite. Improvements in compressive strength of belite cement are shown in samples that incorporated SWNTs@SiO₂ loadings. The coating layer helps enhance bonding strength between reinforced SWNTs and the matrix, as well as promote hydration reactions in the cement paste. The highest increase in the compressive strength of 18.8 % is found in the sample with the minimal SWNTs@SiO₂ loading of 0.02%.

• Periodical: Key Engineering Materials (Volume 718)
• Pages: 157-162
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.718.157
• Online since: November 2016
• Authors: Wanchart Suprompituk, Papot Jaroenapibal*
• Keywords: Belite Cement, Carbon Nanotubes, Composite, Silica Coating

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