A Study on Conversion Fraction and Carbonation of Pozzolan Blended Concrete through 29Si MAS NMR Analysis

Applied Sciences

Jiho Moon¹  JungJ. Kim²  Kwang-Soo Youm³ 

[1] Department of Civil Engineering, Kangwon National University, Chuncheon-si 24341, Korea;Department of Civil Engineering, Kyungnam University, Changwon-si 51767, Korea;Infra Structure Team, Technical Division, GS E&C, Seoul 03159, Korea;

关键词: carbonation;    silica fume;    nanosilica;    pozzolanic reaction;    ²⁹Si MAS NMR;   

DOI  :  10.3390/app10196855

来源: DOAJ

【 摘 要 】

The object of this paper is to investigate the carbonation resistance of concretes containing different pozzolanic materials. Three concrete mixtures that included fly ash, silica fume, and nanosilica were prepared, and the mixtures were designed to have similar mechanical properties to exclude the effect of mechanical properties on the carbonation. These pozzolanic materials in concretes have different silicate contents and grain size distributions. Rapid carbonation tests were conducted to investigate the durability of pozzolan blended concretes for carbonation, and the carbonation depth was measured at one, two, four, and eight weeks after 28-day water curing. ²⁹Si NMR (nuclear magnetic resonance) experiments were performed, and the conversion fractions for each pozzolan blended concrete were extracted. The degree of carbonation was also assessed based on the Nuclear magnetic resonance (NMR) results.

【 授权许可】

Unknown