Stabilisation of marginal lateritic soil using high calcium fly ash-based geopolymer

Strength Characteristics of Clay Stabilized with Fly-ash Based Geopolymer Incorporating Granulated Slag

“…The chemical compositions of the fly-ash and slag used are given in Table 2. The alkaline activator used in the current study to synthesize the geopolymer was prepared from Grade (D) sodium silicate and sodium hydroxide, both in solution form, as recommended by several researchers [e.g., 7,8,18,[19][20][21][22]. The sodium silicate solution was supplied by PQ Australia and contains the following mass ratios: Na2O = 14.7% and SiO2/Na2O = 2.…”

“…However, the addition of calcium containing compounds such as blast furnace slag to geopolymer promotes ambient temperature setting [4], making geopolymer more applicable for bulk application in soil stabilization [5]. Depending on the treatment conditions (i.e., geopolymer ingredients, concentration of geopolymer components, and curing time), geopolymer-treated soils have been reported to provide an increase in unconfined peak strength and a reduction in the corresponding strain [6][7][8][9]. However, to advance the use of geopolymer for ground improvement, an in-depth investigation into understanding the geo-mechanical characteristics of geopolymer-treated soils is required, considering the effects of parameters such as the confining pressure and excess pore water pressure under drained/undrained conditions.…”

Waste in the geopolymerization process. Proposal of the use of asbestos and fly ashes in the production of geopolymer concrete

“…Pacheco-Torgal et al [13] used waste from the tungsten mine in the synthesis of geopolymers. Other studies indicated the usefulness of volcanic tuff, rice husk ash, cinder, sludge from water treatment, soft clay and marginal lateritic soil in the geopolymerization process [2,5,[14][15][16][17][18]. Such obtained geopolymers are characterized by the high resistance to compression.…”

Development of Alternative Stabilization Methods for Transportation Infrastructure Based on Geopolymers

“…Alumino-silicate binders, known as Geopolymers (GPs), are proposed to be a sustainable and eco-friendly alternative to conventional chemical stabilization techniques [1][2][3]. GPs harden at ambient temperatures in a relatively short amount of time [4] and can be synthesized by curing activated solutions of various alumino-silicate sources including natural minerals (e.g.…”