ABSTRACT

Light-burned MgO cement has a lower calcination temperature than ordinary Portland cement. It has been widely studied as a measure to reduce carbon dioxide because of its property of absorbing carbon dioxide during curing. This study investigated the effects of calcination temperature on the physical properties of light hydrated magnesium carbonate and calcined MgO hydrated in moisture and CO₂ at 25 °C and 60 °C. The crystal size of light-burned MgO increased with increasing calcination temperature, and carbonates were formed through carbonation curing. Further, nesquehonite and hydromagnesite were formed in the 25CC and 60CC specimens, respectively, and the carbonate formation reduced with increasing crystal size. The highest compressive strength of 3.5 MPa was obtained for the 25CC specimen in which nesquehonite was formed; however, hydromagnesite exhibited better CO₂ sequestration capacity.

摘要

轻烧MgO水泥的煅烧温度比普通硅酸盐水泥低。由于其在固化过程中吸收二氧化碳的特性，它已被广泛研究作为减少二氧化碳的措施。本研究研究了煅烧温度对轻质水合碳酸镁和在水分和CO _{2中水合的煅烧MgO物理性质的影响。}在 25°C 和 60°C。轻烧MgO的晶体尺寸随着煅烧温度的升高而增大，并通过碳化固化形成碳酸盐。此外，在 25CC 和 60CC 试样中分别形成了水菱镁矿和水菱镁矿，并且随着晶体尺寸的增加，碳酸盐的形成减少。3.5 MPa 的最高抗压强度在 25CC 试样中形成，其中形成了水菱镁矿；然而，水菱镁矿表现出更好的CO ₂封存能力。