title: CO2 capture using fly ash from coal fired power plant and applications of CO2-captured fly ash as a mineral admixture for concrete.
abstract: The utilization of fly ash as a solid sorbent material for CO2 capture via surface adsorption and carbonation reaction was evaluated as an economically feasible CO2 reduction technique. The results show that fly ash from a coal fired power plant can capture CO2 up to 304.7 μmol/g fly ash, consisting of 2.9 and 301.8 μmol/g fly ash via adsorption and carbonation, respectively. The CO2 adsorption conditions (temperature, pressure, and moisture) can affect CO2 capture performance of fly ash. The carbonation of CO2 with free CaO in fly ashes was evaluated and the results indicated that the reaction consumed most of free CaO in fly ash. The fly ashes after CO2 capture were further used for application as a mineral admixture for concrete. Properties such as water requirement, compressive strength, autoclave expansion, and carbonation depth of mortar and paste specimens using fly ash before and after CO2 capture were tested and compared with material standards. The results show that the expansion of mortar specimens using fly ash after CO2 capture was greatly reduced due to the reduction of free CaO content in the fly ash compared to the expansion of specimens using fresh fly ash. There were no significant differences in the water requirement and compressive strength of specimens using fly ash, before and after CO2 capture process. The results from this study can lead to an alternative CO2 capture technique with doubtless utilization of fly ash after CO2 capture as a mineral admixture for concrete.
authors.affiliation: School of Bio-Chemical Engineering and Technology, Sirindhorn International Institute of Technology, P.O. Box 22, Thammasat-Rangsit Post Office, Klong Luang District, Pathumthani 12121, Thailand.
authors.forename: Chaichan
authors.initials: C
authors.lastname: Siriruang
authors.affiliation: School of Bio-Chemical Engineering and Technology, Sirindhorn International Institute of Technology, P.O. Box 22, Thammasat-Rangsit Post Office, Klong Luang District, Pathumthani 12121, Thailand. Electronic address: pisanu@siit.tu.ac.th.
authors.forename: Pisanu
authors.initials: P
authors.lastname: Toochinda
authors.affiliation: Construction and Maintenance Technology Research Center, Sirindhorn International Institute of Technology, P.O. Box 22, Thammasat-Rangsit Post Office, Klong Luang District, Pathumthani 12121, Thailand.
authors.forename: Parnthep
authors.initials: P
authors.lastname: Julnipitawong
authors.affiliation: School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, P.O. Box 22, Thammasat-Rangsit Post Office, Klong Luang District, Pathumthani 12121, Thailand.
authors.forename: Somnuk
authors.initials: S
authors.lastname: Tangtermsirikul
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D002245:Carbon Dioxide / Q000737:chemistry*; D060729:Coal Ash / Q000737:chemistry*; D004787:Environmental Pollution / Q000517:prevention & control; D006801:Humans; D011210:Power Plants
chemical_list: D000393:Air Pollutants; D060729:Coal Ash; D002245:Carbon Dioxide
keywords: CO(2) capture; Fly ash; Free CaO reduction; Mineral admixture; Solid sorbent