The biomimetic mineralization of the concrete

• Main Authors: Hsiao, Hsien Shih, 蕭憲詩
• Other Authors: Chen, Chien-Yen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/85935917954735236860

碩士 === 國立中正大學 === 應用地球物理研究所 === 100 === The biomimetic mineralization is to use the biological organic compounds as template to control the formation of inorganic compounds with unique microstructure properties. Concrete of hydrophilic material contains Ca(OH)2 that has harmful effect on the strength of the concrete. The content of Ca(OH)2 could be decreased by adding CO2 and the product of CaCO3 crystallization also could be sued to fill the micro-cracking of the concrete which therefore increase the strength of the concrete. This research was to study the use of stearic acid as template for the control of shape and property of CaCO3 crystallization by carbonation, which produced hydrophobic concrete. The shape of the CaCO3 crystallization was found to be needle-like. From the mechanical point of view, those needle-like structures could interweave the meshed surface of concrete, which has positive effect on the strength of concrete. However, in the case of addition of hydrophobic carbon fiber, the strength of concrete decreased because the size effect of carbon fiber. This disadvantage could be improved by the use of biomineralization and resulted in the increase of the strength of concrete. The hydrophobic result showed that the hydrophobic surface can be achieved in all the cases after the process of biomineralizing. The values of water contact angle (WCA) were even over 120°. In the case of saturation curing with Ca(OH)2 solution, the WCA value has the highest value of 140°. The CaCO3 crystallization also found to increase the strength of concrete up to 66.72±0.09 Mpa comparing the 37.41±0.91 Mpa for the control case. The results showed the biomineralization using organic compounds could produce the hydrophilic concrete and increase strength spontaneously.