新型低钙水泥的制备及其碳化硬化过程

Preparation and Carbonation-Hardening Process of Low-Calcium Cement Composition

制备了一种以3CACO3·2SiO2（C3S2）为主要矿物组成的低钙水泥熟料，用碳化的方式使熟料硬化，研究了这种熟料矿物的形成温度、碳化硬化过程及力学性能。结果表明：C3S2熟料的形成温度范围为1300～1460℃，其碳化产物为CaCO3，试样在120℃碳化3、7d的抗压强度分别达到32和43MPa。该低钙水泥具有低的CO2排放量，且碳化硬化过程耗用大量的C02，同时，由于低钙且其熟料自粉化，因此具有显著的低碳排放和节能特点。

A low calcium cement clinker mainly consisting of 3CaCO3·2SiO2 （C3S2） mineral was prepared, and the clinker was hardened via carbonization. The clinker formation temperature, hardening process and mechanical properties were investigated. The results show that the formation temperature of C3S2 clinker is from 1 300 ℃ to 1 460 ℃, the carbonization product is CaCO3, and the compressive strengths of C352 samples are 32 and 43 MPa after carbonation at 120 ℃ for 3 and 7 d, respectively. The low calcium cement has low CO2 emissions, and consumes a large amount of CO2 during the hardening process. The low calcium cement has the features of low carbon and energy-saving due to its low calcium and self-powdering characteristic.