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Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating gamma-Dicalcium Silicate

Title
Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating gamma-Dicalcium Silicate
Author
이한승
Issue Date
2019-08
Publisher
HINDAWI LTD
Citation
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING, v. 2019, Article no. 9856734
Abstract
In this study, gamma-dicalcium silicate (gamma-C2S) was incorporated into ordinary Portland cement (OPC) to sequester CO2 to enhance the carbonation resistance of cement-based composite materials. gamma-C2S can react with CO2 rapidly to form vaterite and high dense SiO2 gel which could block the pores off and then inhibit further diffusion of CO2 into the system. Cement mortar specimens containing 0%, 5%, 10%, 20%, and 40% gamma-C2S as cement replacement were prepared. After water curing for 28 days followed by curing in an environmental chamber for 28 days, the specimens were then exposed to an accelerated carbonation with 5% CO2 concentration for 28 days. The carbonation depth of the cement mortar with a low replacement rate (5% and 10%) was lower than that of the OPC mortar at all ages due to the sequestration of CO2 by gamma-C2S. However, the cement mortar with a high replacement rate (20% and 40%) showed less carbonation resistance due to the dilution effect of gamma-C2S replacement and increase in initial porosity caused by nonhydraulic characteristic of gamma-C2S.
URI
https://www.hindawi.com/journals/amse/2019/9856734/abs/http://repository.hanyang.ac.kr/handle/20.500.11754/121939
ISSN
1687-8434; 1687-8442
DOI
10.1155/2019/9856734
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ARCHITECTURE(건축학부) > Articles
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