Graduate Program in Construction and Infrastructure Management, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand.
School of Civil Engineering, Center of Excellence in Innovation for Sustainable Infrastructure Development, Suranaree University of Technology, Thailand.
J Hazard Mater. 2018 Jan 5;341:257-267. doi: 10.1016/j.jhazmat.2017.07.067. Epub 2017 Jul 31.
Granulated Blast Furnace Slag (GBFS) was used as a replacement material in marginal lateritic soil (LS) while class C Fly Ash (FA) was used as a precursor for the geopolymerization process to develop a low-carbon pavement base material at ambient temperature. Unconfined Compression Strength (UCS) tests were performed to investigate the strength development of geopolymer stabilized LS/GBFS blends. Scanning Electron Microscopy and X-ray Diffraction analysis were undertaken to examine the role of the various influencing factors on UCS development. The influencing factors studied included GBFS content, NaSiO:NaOH ratio (NS:NH) and curing time. The 7-day soaked UCS of FA geopolymer stabilized LS/GBFS blends at various NS:NH ratios tested was found to satisfy the specifications of the Thailand national road authorities. The GBFS replacement was found to be insignificant for the improvement of the UCS of FA geopolymer stabilized LS/GBFS blends at low NS:NH ratio of 50:50. Microstructural analysis indicated the coexistence of Calcium Silicate Hydrate (CSH) and Sodium Alumino Silicate Hydrate products in FA geopolymer stabilized LS/GBFS blends. This research enables GBFS, which is traditionally considered as a waste material, to be used as a replacement and partially reactive material in FA geopolymer pavement applications.
矿渣微粉（GBFS）被用作边缘红土（LS）的替代材料，而 C 级粉煤灰（FA）则被用作制备地聚合物的前体，以在环境温度下开发低碳路面基层材料。进行了无侧限抗压强度（UCS）测试，以研究地聚合物稳定的 LS/GBFS 混合物的强度发展。进行了扫描电子显微镜和 X 射线衍射分析，以研究各种影响因素对地聚合物 UCS 发展的作用。研究的影响因素包括 GBFS 含量、硅酸钠：氢氧化钠比（NS:NH）和养护时间。发现以不同 NS:NH 比测试的 FA 地聚合物稳定的 LS/GBFS 混合物在 7 天浸泡后的 UCS 满足泰国国家道路当局的规范。在低 NS:NH 比为 50:50 时，发现 GBFS 替代对 FA 地聚合物稳定的 LS/GBFS 混合物的 UCS 提高作用不大。微观结构分析表明，FA 地聚合物稳定的 LS/GBFS 混合物中存在硅酸钙水合物（CSH）和硅酸钠铝水合物产物。这项研究使矿渣微粉（GBFS）能够被用作 FA 地聚合物路面应用中的替代材料和部分反应性材料，而矿渣微粉传统上被认为是一种废物材料。
