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http://dx.doi.org/10.7844/kirr.2022.31.6.52

Manufacturing Properties and Hardening Characteristic of CO2 Reactive Hardening Cement  

Ki-Yeon Moon (Korea Institute of Limestone and Advanced Materials)
Byung-Ryeol Kim (Korea Institute of Limestone and Advanced Materials)
Seung-Han Lee (Korea Institute of Limestone and Advanced Materials)
Moon-Kwan Choi (Korea Institute of Limestone and Advanced Materials)
Kye-Hong Cho (Korea Institute of Limestone and Advanced Materials)
Jin-Sang Cho (Korea Institute of Limestone and Advanced Materials)
Publication Information
Resources Recycling / v.31, no.6, 2022 , pp. 52-59 More about this Journal
Abstract
Calcium silicate based cement (CSC) is a low-carbon cement that emits less CO2 by up to 70% compared to ordinary Portland cement during its manufacture. Most developed countries have commercialized CSC, whereas Korea is still investigating the manufacturing characteristics and basic properties of CSC. This paper provides a review of methods for manufacturing CSC using domestic raw materials and discusses the possibility of CSC localization based on an evaluation of the basic physical properties of manufactured CSC. The experimental results of this study indicate that the primary mineral components of CSC were CS, C3S2 C2S, and unreacted SiO2. This suggests the possibility of manufacturing CSC using domestic raw materials that exhibit mineral compositions similar to that of theoretical CSC. The compressive strength of CSC mortar is less than 1MPa at the age of 7 d under wet curing. This implies that hydration does not affect the property development of CSC mortar. Meanwhile, during carbonation curing, the compressive strength is 56 MPa or higher after 7 d, which indicates excellent early strength development. Furthermore, results of Thermogravimetric Analysis Differential scanning calorimetry (TG/DSC) show that a significant amount of CaCO3 is formed, which is consistent with the results of previous studies. This implies that carbonation is associated significantly with the properties of CSC.
Keywords
Mineral carbonation; Calcium silicated based cement; Carbonation curing; High early strength; Low carbon cement;
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