The application of CO2 in the curing process of cement brick products
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초록
This study aimed to analyse the effect of applying CO2 gas to the curing of cement products for the reduction of CO2, not onlyfrom the general steam curing process but also from cement factories and thermoelectric power plants, which are major causesof global warming. Cement mortar bar test specimens were produced by brick mixing in Korea. The CO2 uptake rate wasmeasured after 1 hr of CO2 curing and the compressive strength and length changes of the specimens were tested bycomparing them with air-cured specimens and steam cured specimens for 5 hr. The CO2 uptake rate was measured asapproximately 10% using an electronic scale and a thermogravimetric analysis (TGA). The CO2-cured specimens hadrelatively outstanding strength immediately after curing owing to carbonation. However, the strength at 28 days was the lowestdue to reduced inner moisture by early carbonation reaction. In addition, the CO2-cured specimens showed the lowest dryshrinkage rate due to significant production of CaCO3, which has excellent dimensional stability and which reduced the initialmoisture by an exothermic reaction.
Abstract
This study aimed to analyse the effect of applying CO2 gas to the curing of cement products for the reduction of CO2, not onlyfrom the general steam curing process but also from cement factories and thermoelectric power plants, which are major causesof global warming. Cement mortar bar test specimens were produced by brick mixing in Korea. The CO2 uptake rate wasmeasured after 1 hr of CO2 curing and the compressive strength and length changes of the specimens were tested bycomparing them with air-cured specimens and steam cured specimens for 5 hr. The CO2 uptake rate was measured asapproximately 10% using an electronic scale and a thermogravimetric analysis (TGA). The CO2-cured specimens hadrelatively outstanding strength immediately after curing owing to carbonation. However, the strength at 28 days was the lowestdue to reduced inner moisture by early carbonation reaction. In addition, the CO2-cured specimens showed the lowest dryshrinkage rate due to significant production of CaCO3, which has excellent dimensional stability and which reduced the initialmoisture by an exothermic reaction.
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