CO2 Uptake of Carbonation-Cured Cement Blended with Ground Volcanic Ash

Autor:	Joon Ho Seo, Issam T. Amr, Sol Moi Park, Rami A. Bamagain, Bandar A. Fadhel, Gwang Mok Kim, Ali S. Hunaidy, Haeng Ki Lee
Jazyk:	angličtina
Rok vydání:	2018
Předmět:	Saudi volcanic ash natural pozzolan carbonation Portland cement CO2 uptake Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Zdroj:	Materials, Vol 11, Iss 11, p 2187 (2018)
Druh dokumentu:	article
ISSN:	1996-1944
DOI:	10.3390/ma11112187
Popis:	Accelerated carbonation curing (ACC) as well as partial replacement of cement with natural minerals are examples of many previous approaches, which aimed to produce cementitious products with better properties and environmental amicabilities. In this regard, the present study investigates CO2 uptake of carbonation-cured cement blended with ground Saudi Arabian volcanic ash (VA). Paste samples with cement replacement of 20%, 30%, 40%, and 50% by mass were prepared and carbonation-cured after initial curing of 24 h. A compressive strength test, X-ray diffractometry (XRD), and thermogravimetry were performed. Although pozzolanic reaction of VA hardly occurred, unlike other pozzolana in blended cement, the results revealed that incorporation of VA as a supplementary cementitious material significantly enhanced the compressive strength and diffusion of CO2 in the matrix. This increased the CO2 uptake capacity of cement, reducing the net CO2 emission upon carbonation curing.
Databáze:	Directory of Open Access Journals
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