Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Abstract

In this paper the potential of introducing alkali activated fly ash to a clayey soil as stabilizing agent was investigated. As alkaline activator Potassium hydroxide of 12 M was introduced to the soil fly ash mixtures. Unconfined compressive strength tests were carried out. Four different fly ash/solid ratios were proposed to be 10 %, 20 %, 30 % and 40 % at two curing regimes of 7 & 28 days. The highest unconfined compressive strength was of 40 % mixture recorded at 3.68 MPa after 28 days. Alkaline activation of clayey soil using KOH solution as an activator proved to be a feasible alternative for soft soil stabilization.

Evaluating Shear Strength of Sand- GGBFS Based Geopolymer Composite Material

“…Similar trend was observed by Teing et al [24]. The reason for this improvement are the microstructural changes (such as uptake, re-condensation and the presence of glassy phase) taking place in the mixture fabric during the stabilization process [22][23][24][25]. Scanning Electron Microscopy SEM showed that voids between soil particles were almost filled with structured aluminosilicate polymerized gel.…”

“…Scanning Electron Microscopy SEM showed that voids between soil particles were almost filled with structured aluminosilicate polymerized gel. Therefore, discrete particles of the geopolymer composite material exhibit a denser and more closely bound texture [22][23][24][25].…”

Characterization of Eggshell and Natural Chloride Stabilized Soil Using Geophysical Techniques

“…Razali et al [20] claimed that a Peat stabilised by Vinyl Acetate-Acrylic copolymer (VAAC) in an amalgam of sand, lime and cement may produce satisfactory results. An alkali activated flyash stabilised soil also demonstrated high UCS value after 28 days curing [21].…”

Archives of Mining Sciences

“…it also increases the brittleness of soil significantly. This issue is comparable to soils subjected to treatment with cement and lime, which increase strength since aluminium-silicate hydrate (ASh) is the cementitious agent in cement, and calciumsilicate hydrate (CSh) is the cementitious agent in lime [38][39][40][41].…”