Most of the calcium silicates exhibit high carbonation reactivity, and thus start to be utilized in the production of low carbon concrete due to the growing pressure of carbon mitigation in the cement industry. In this study, powdered γ-C₂S, with limited hydraulicity, is preconditioned in a suspension consisting of urease-producing bacterium and urea. This biomineralization process induces the precipitation on the γ-C₂S surface of calcite crystals with spherical shape, the size of which is dependent on the urea suspension concentration. The effect of the pre-existing calcite crystals on the carbonation behavior, mechanical and micro-morphology of γ-C₂S compacts is investigated. Results indicate the compressive strength are significantly improved with the pre-existing calcite crystals, and the increasing percentage is 43.66 % at 30 min carbonation and 0.25 mol/L urea concentration. The strength enhancement is found to be associated with the pre-existing calcite crystals acting as nucleation seeds which accelerate the carbonation at the early stage. In addition, the pre-existing calcite seeds induce the preferential formation of calcite in the crystalline carbonation products of γ-C₂S, which may be beneficial to the enhancement of the carbonated products.

大多数硅酸钙表现出很高的碳酸化反应活性，因此由于水泥工业中减碳的压力越来越大，开始被用于低碳混凝土的生产中。在这项研究中，粉末状的γ-C ₂ S，具有有限的水硬性，是在由产脲酶细菌和尿素的悬浮液预处理。此生物矿化过程诱导γ-C上的沉淀₂具有球形形状方解石晶体的S面，其大小依赖于尿素的浓度悬浮液。预先存在的方解石晶体上的碳化行为，机械和微结构的影响γ-C ₂研究了S压块。结果表明，预先存在的方解石晶体，其抗压强度得到了显着提高，并且在碳化30分钟和尿素浓度为0.25 mol / L时，增加的百分数为43.66％。发现强度的增强与预先存在的方解石晶体作为成核种子有关，这些晶体在早期加速了碳化。另外，预先存在的方解石晶种诱导γ-C的结晶碳化产物优先形成方解石₂ S，其可以是到碳酸产品的增强有益的。