Shi Jinyan, Tan Jinxia, Liu Baoju, Chen Jiazhuo, Dai Jingdan, He Zhihai
School of Civil Engineering, Central South University, Changsha 410075, PR China.
School of Civil Engineering, Central South University, Changsha 410075, PR China.
J Hazard Mater. 2021 Feb 5;403:123983. doi: 10.1016/j.jhazmat.2020.123983. Epub 2020 Sep 16.
As the industrial waste from blast furnace ironmaking, air-cooled blast furnace slag (ACBFS) puts a lot of pressure on the environment. It is becoming more and more urgent to deal with the increasing ACBFS. In this study, the concept of "full-volume slag alkali-activated mortars (FSAM)" is proposed using ground granulated water-cooled blast furnace slag (GGBS) as aluminosilicate material and ACBFS to replace machine-made sand, aiming to solve the current situation of increasing scarcity of natural resources. The characteristics of ACBFS are investigated, and its stability and heavy metal leaching all meet the requirements as a building material. The results show that the flowability and mechanical properties of FSAM are significantly enhanced with the substitution rate of ACBFS increases. Meanwhile, the incorporation of ACBFS is also beneficial to improve the compactness of the microstructure of the mortar, thereby improving the impermeability (Water, ion and gas) of FSAM. In addition, the specimen mixed with ACBFS showed good high temperature resistance due to the porous feature of the aggregate. Furthermore, using a small amount of limestone powder to replace GGBS can slightly improve the performance of FSAM. Therefore, ACBFS is recommended to be used in FSAM, which meets safety, cost and environmental benefits.
作为高炉炼铁产生的工业废渣，风冷高炉矿渣（ACBFS）给环境带来了很大压力。处理日益增加的ACBFS变得越来越紧迫。在本研究中，提出了“全量矿渣碱激发砂浆（FSAM）”的概念，以磨细粒化水淬高炉矿渣（GGBS）为硅铝酸盐材料，用ACBFS替代机制砂，旨在解决当前自然资源日益稀缺的现状。对ACBFS的特性进行了研究，其稳定性和重金属浸出均满足作为建筑材料的要求。结果表明，随着ACBFS替代率的增加，FSAM的流动性和力学性能显著提高。同时，ACBFS的掺入也有利于提高砂浆微观结构的致密性，从而提高FSAM的抗渗性（水、离子和气体）。此外，由于骨料的多孔特性，掺入ACBFS的试件表现出良好的耐高温性能。此外，用少量石灰石粉替代GGBS可略微改善FSAM的性能。因此，建议在FSAM中使用ACBFS，这符合安全、成本和环境效益。
