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Soil-lime reaction and microstructural development at elevated temperatures

Published online by Cambridge University Press:  09 July 2018

S. Wild ,
M. Arabi  and
G. Leng-Ward
S. Wild
Affiliation:
The Polytechnic of Wales, Department of Civil Engineering and Building, Pontypridd, Mid Glamorgan, and Department of Physics, Warwick University, Coventry CV4 7AL
M. Arabi
Affiliation:
The Polytechnic of Wales, Department of Civil Engineering and Building, Pontypridd, Mid Glamorgan, and Department of Physics, Warwick University, Coventry CV4 7AL
G. Leng-Ward
Affiliation:
The Polytechnic of Wales, Department of Civil Engineering and Building, Pontypridd, Mid Glamorgan, and Department of Physics, Warwick University, Coventry CV4 7AL
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Abstract

Mineralogical analysis of Devonian Red Marl using XRD, TEM, SEM and EDAX showed that it consisted of illite, quartz, and feldspar with minor amounts of chlorite and hematite. Physico-chemical changes in the soil minerals on reaction with lime (calcium hydroxide) from one day up to two years were investigated by these techniques to gain information on the soil-lime reaction mechanism. Significant reaction of the soil minerals and lime was found to occur only at elevated temperatures (50–75°C) in a moist environment. At these temperatures, formation, growth and development of fibrous and foil-like cementitious material was observed. XRD analysis provided no strong evidence for the formation of new phases. TEM analysis and EDAX, however, showed that the newly-formed fibrous and foil-like material consisted of an amorphous calcium silicate aluminate hydrate gel, similar to the gels formed during hydrothermal treatment of lime-silica, but with lower calcium to silicon ratios than previously reported for such gels. The morphological development of the gel suggested that it formed as a result of the progressive breakdown of the clay component in the soil by reaction with the calcium ions from the lime.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 3 , September 1986 , pp. 279 - 292
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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