Pore Structure Characterization in Concrete Prepared with Carbonated Fly Ash

7th National Conference on Processing and Characterization of Materials

Sahoo, Sanjukta^1

Department of Civil Engineering, KIIT Polytechnic, KIIT (Deemed to Be University), Bhubaneswar, Odisha

751024, India^1

关键词: Carbon dioxide capture and storage;    Concrete specimens;    Correlation analysis;    Durability of concretes;    Linear relationships;    Mercury intrusion porosimetry tests;    Pore structure characterizations;    Porosity reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/338/1/012007/pdf
DOI  :  10.1088/1757-899X/338/1/012007

来源: IOP

【 摘 要 】

Carbon dioxide capture and storage (CCS) is a technique to address the global concern of continuously rising CO2level in the atmosphere. Fly ash is considered as a suitable medium for CCS due to presence of metal oxides. The fly ash which has already sequestered carbon dioxide is referred to as carbonated fly ash. Recent research reveals better durability of concretes using carbonated fly ash as part replacement of cement. In the present research pore structure characterization of the carbonated fly ash concrete has been carried out. Mercury Intrusion porosimetry test has been conducted on control concrete and concrete specimens using fly ash and carbonated fly ash at replacement levels of 25% and 40%. The specimens have been water cured for 28 days and 90 days. It is observed that porosity reduction rate is more pronounced in carbonated fly ash concrete compared to control concrete at higher water curing age. Correlation analysis is also carried out which indicates moderately linear relationship between porosity % and pore distribution with particle size and water curing.