Department of Chemical and Biological Engineering, Sir Robert Hadfield Building, The University of Sheffield, Sheffield S1 3JD, United Kingdom.
Laboratory of Application of Nanotechnology in Civil Construction (LabNANOTEC), Department of Civil Engineering, Federal University of Santa Catarina (UFSC), Brazil.
Waste Manag. 2024 Jun 15;182:225-236. doi: 10.1016/j.wasman.2024.04.042. Epub 2024 Apr 26.
This article explores the impact of thermally treated asbestos-cement waste (ACW) on metakaolin-based geopolymers, using liquid sodium silicate (LSS) and liquid potassium silicate (LKS) as alkali activators. Through statistical mixture design, various formulations were tested for rheological parameters, mineralogical composition, efflorescence mass, electrical conductivity, compressive strength, and CO emissions. Formulations with sodium silicate exhibited higher yield stress compared to those with potassium silicate, while flash setting occurred in LKS-activated mixtures with high ACW content. Alkali activator content significantly affected mechanical strength and leachate electrical conductivity. CO emissions were higher for LKS-activated formulations but lower for those with more ACW. Finally, by incorporating ACW, it was possible to optimize the formulations, resulting in high compressive strength, reduced free ions, and reduced negative environmental impact.
本文探讨了经热处理的石棉水泥废物（ACW）对基于偏高岭土的地聚合物的影响，使用液体硅酸钠（LSS）和液体硅酸钾（LKS）作为碱激发剂。通过统计混合设计，对各种配方进行了流变性参数、矿物成分、泛霜质量、电导率、抗压强度和 CO 排放的测试。与使用硅酸钾的配方相比，使用硅酸钠的配方表现出更高的屈服应力，而在高 ACW 含量的 LKS 激活混合物中发生了闪凝。碱激发剂含量显著影响机械强度和浸出液电导率。LKS 激活配方的 CO 排放较高，但 ACW 含量较高的配方则较低。最后，通过掺入 ACW，可以优化配方，从而获得高抗压强度、减少游离离子和降低负面环境影响。
