高温养护下电石渣激发全固废胶凝材料的水化特性及耐久性

Hydration characteristics and sustainability of calcium carbide slag-activated full solid waste cementitious materials under high temperature curing.

作者信息

Gu Xiaowei, Wang Xu, Ge Xiaowei, Wang Shenyu, Hu Ziyang, Wang Hongyu, Liu Jianping, Zhang Xinlong, Wang Xueli

机构信息

School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang 110819, China; Liaoning Institute of Technological Innovation in Solid Waste Utilization, Northeastern University, Shenyang 110819, China.

出版信息

Environ Res. 2025 Jul 7:122309. doi: 10.1016/j.envres.2025.122309.

DOI:10.1016/j.envres.2025.122309

PMID:40633643

Abstract

Using calcium carbide slag (CCS) to replace ordinary portland cement (OPC) as an alkali activator for the preparation of full solid waste cementitious material is a green and low carbon method. This study investigates the influence of 80 °C high-temperature curing on ground granulated blast furnace slag - steel slag based supersulfated cement (GS-SSC) incorporating 0 to 20 wt% CCS. The hydration products and microstructure of GS-SSC were analysed using various microscopic techniques, assess the compressive strength and pH value development, exploring the hydration mechanism of CCS activated GS-SSC. The results indicated that the CCS could increase the alkalinity of GS-SSC, activate the pozzolanic activity of ground granulated blast furnace slag-steel slag (GGBS-SS). Compared with the control group, the CCS promote the generation of more AFt and C-(A)-S-H gels, fill the pores and microcracks of the samples, making the microstructures denser. CCS significantly increased the compressive strength of the samples under curing at high temperatures. When 10% CCS was incorporated, the compressive strength reached 31.2 MPa at 3 d and further increased to 33.5 MPa at 7 d. Moreover, sustainability assessment results indicate that the material exhibits favorable environmental and performance sustainability under this dosage condition. It is remarkable that a higher CCS content (>10%) has a negative effect on the compressive strength of the samples. These results provide a new approach to promote the resourceful efficient utilisation of industrial solid waste and serve as a valuable reference for designing low carbon cementitious materials based on GGBS-SS.

摘要

使用电石渣（CCS）替代普通硅酸盐水泥（OPC）作为碱激发剂来制备全固废胶凝材料是一种绿色低碳的方法。本研究调查了80℃高温养护对掺入0至20 wt% CCS的粒化高炉矿渣-钢渣基超硫酸盐水泥（GS-SSC）的影响。使用各种微观技术分析了GS-SSC的水化产物和微观结构，评估了抗压强度和pH值的发展，探索了CCS激发的GS-SSC的水化机理。结果表明，CCS可以提高GS-SSC的碱度，激发粒化高炉矿渣-钢渣（GGBS-SS）的火山灰活性。与对照组相比，CCS促进生成更多的AFt和C-(A)-S-H凝胶，填充样品的孔隙和微裂纹，使微观结构更致密。CCS显著提高了高温养护下样品的抗压强度。当掺入10% CCS时，3 d时抗压强度达到31.2 MPa，7 d时进一步提高到33.5 MPa。此外，可持续性评估结果表明，在此用量条件下该材料具有良好的环境和性能可持续性。值得注意的是，较高的CCS含量（>10%）对样品的抗压强度有负面影响。这些结果为促进工业固废的资源化高效利用提供了一种新方法，并为基于GGBS-SS设计低碳胶凝材料提供了有价值的参考。