Effects of the Curing Conditions on the Carbonation Curing Efficiency of Ordinary Portland Cement and a Belite-Rich Cement Mortar

Abstract

In the present study, the efficiency of five different carbonation and/or water curing conditions on the properties of belite-rich cement mortar and ordinary Portland cement mortar was investigated. The hybrid curing of samples was carried out by submerging samples at different levels in water or in a lime-saturated solution kept under carbonation curing conditions. The compressive strength was measured to compare the physical properties of the cement mortars, and X-ray diffraction and thermogravimetric analysis results were analyzed to compare the physicochemical properties. The results revealed that the supply of additional moisture during carbonation curing tends to decrease carbonation curing efficiency and that the hydration products of cement paste are predominantly affected by the depth at which the specimen was immersed in the liquid rather than the type of liquid used.

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

“…Moreover, compressive strengths for FAC30 and FAC40 reached 46.2 and 44.6 MPa respectively, at 90 d, these were represented 93.3 and 90.1% of RC at the same period, respectively. This was mainly attributed to the occurrence of more pores on the surface of clinker minerals, as well as a 20% increase in the volume porosity of early hydration hardening paste [20]. Moreover, a decrease in internal pores of the specimen, coupled with no dense formation of the structure, caused a reduction in the early strength.…”

Early CO2 capturing mortar by incorporating a new potential carbide lime waste under controlled CO2 curing

“…The strength of the weight loss peak associated with calcite, which occurs between 600-800 °C, increases as the degree of carbonation in a cement paste sample increases [25]. The amount of CaCO 3 in the normal OPC mortar was increased from day 1 to day 3.…”

“…The amount of portlandite, Ca(OH)2 in each cement pastes was lesser due to the increasing in the carbonation rate. The corresponding peak could not show up if the carbonation process consumes the majority of the Ca(OH)2.The strength of the weight loss peak associated with calcite, which occurs between 600-800 °C, increases as the degree of carbonation in a cement paste sample increases[25]. The amount of CaCO 3 in the normal OPC mortar was increased from day 1 to day 3.…”