Lu Zhu, Hanxiong Lyu, Yang Liu, Shipeng Zhang, Chi Sun Poon
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引用次数: 0
摘要
通过焚烧污水污泥灰(ISSA)和再生混凝土细粉(RCF)的回收利用,基于热力学模拟和实验验证,建立了固体废物衍生熟料设计方法。与 1000 °C 和 1100 °C 相比,1200 °C 是富含 CS 的熟料合成的最佳温度,因为烧结后的模拟白云石含量最高。利用率达到 95%,实现了固体废物回收利用的最大化。由于高含量褐铁矿(46.8%)与 CO 反应形成了 CaCO 相,碳化 1200ARS 生态水泥的抗压强度高于 OPC 和其他生态水泥。碳化 1200ARS 生态水泥还具有最低的孔隙率(18.1%)和致密的微观结构。得益于褐铁矿的高二氧化碳反应活性,1200ARS显示出最佳的二氧化碳封存能力,碳化程度(30.1%)高于其他批次,为未来低碳水泥工业的发展提供了一个实现环境可持续发展的前景广阔的方向。
Binary solid wastes derived clinker: Raw feed system design validation and thermodynamic simulation investigation
Solid waste derived clinker design methodology was established based on thermodynamic simulation and experiment validation via the recycling of incinerated sewage sludge ash (ISSA) and recycled concrete fine (RCF). Compared with 1000 °C and 1100 °C, 1200 °C was the optimum temperature for C2S-rich clinker synthesis due to the highest simulated belite content after sintering. A utilization rate of 95 % was achieved, accomplishing the maximization of solid waste recycling. Due to the CaCO3 phase formation by the reaction of high-content belite (46.8 %) with CO2, carbonated 1200ARS eco-cement showed higher compressive strength than OPC and other eco-cements. The lowest porosity (18.1 %) with dense microstructure was also obtained by carbonated 1200ARS. Benefiting from the high CO2 reactivity of belite, 1200ARS displayed the optimum CO2 sequestration capacity with a higher carbonation degree (30.1 %) than other batches, providing a promising direction for future development of the low-carbon cement industry to achieve environmental sustainability.
期刊介绍:
Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.