Hydration Products, Microstructure and Durability of Concrete with Metakaolin Addition

• DOI: 10.4028/www.scientific.net/kem.680.420
• Publication Date: 2016-02-15T12:02:14Z
• Authors: Qiu Li; Hai Ning Geng; Yun Huang; Zhong He Shui
• Keywords: 02 engineering and technology; 0210 nano-technology; 6. Clean water

The durability, microstructure and hydration products of concrete containing 0-6wt% metakaolin (MK) were studied by analytical techniques. The hydration products were calcium hydroxide (CH), ettringite and calcium silicate hydrate gels in the control concrete, and additional monocarboaluminate and hemicarboaluminate were identified in concrete containing MK. CH content decreased by 28 days hydration in concrete containing MK, due to the pozzolanic reaction between MK and CH. Chloride diffusion coefficient decreased with the increase of MK content. By addition of 6wt% MK, chloride diffusion coefficient decreased by 60%.