wAbstract
@The effect of calcium-based stabilizers such as lime on the geotechnical
properties of tropical soils has been reported by many researchers.
However, the amount of literature available on the micro-structural,
molecular, and leaching characteristics of lime and in particular
phosphoric acid-stabilized lateritic clays has been limited. This
research was carried out in attempt to identify the time-dependent
soil-chemical reactions. In addition, the possible mechanisms
that contributed to the stabilization process were discussed in
the light of various spectroscopic and microscopic techniques
such as X-ray diffractometry (XRD), energy-dispersive X-ray spectrometry
(EDAX), field emission scanning electron microscopy (FESEM), Fourier
transform infrared spectroscopy (FTIR), and nuclear magnetic resonance
spectroscopy (NMR) etc. Based on the results it was found that
in lime-treated samples, the coating action of free iron oxides
on clay particles imposed inhibitive effects on the dissolution
of clay alumina. On the other hand, in phosphoric acid-stabilized
soil, due to the increase in solubility of metal oxides and also
the subsequent release of clay alumina the formation of cementitious
compounds were more feasible. From engineering point of view,
the phosphoric acid-stabilized lateritic soil showed the highest
degree of improvement with an approximately threefold strength
increase in comparison with the natural soil over an 8-month curing
period.
Keywords: Laterite clay; Stabilization; Phosphoric acid; Lime;
Molecular structure; Leaching; Coatingx
Introduction
Materials and experimental programme
@Materials
@Preparation of specimens
Testing programme
Results and discussion
Conclusions
Acknowledgment
References