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標題: Hydrophobic Calcium Carbonate for Cement Surface
作者: 陳豪吉
How-Ji Chen
Shashi B. Atla
Yi-Hsun Huang
James Yang
Yi-Hao Kuo
Chun-Mei Hsu
Wen-Chien Lee
Chien-Cheng Chen
Duen-Wei Hsu
Chien-Yen Chen
關鍵字: SEM;X-ray diffraction;carbonation;micromechanics;CaCO3;cement
Project: Crystals 2017, 7(12), 371
This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process. With increasing temperatures, the particles changed from irregular shapes to more uniform rod-like structures and then aggregated to form a plate-like formation. The contact angle against water was found to increase with increasing temperature; after 90 °C there was no further increase. The maximum contact angle of 129° was obtained at the temperature of 60 °C. It was also found that carbonation increased the micro hardness of the cement material. The micro hardness was found to be dependent on the morphology of the CaCO3 particles. The rod like structures which caused increased mineral filler produced a material with enhanced strength. The 13C cross polarization magic-angle spinning NMR spectra gave plausible explanation of the interaction of organic-inorganic moieties.
DOI: 10.3390/cryst7120371
Appears in Collections:土木工程學系所

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