This thesis is concerned with the phenomenon of Rising Damp,
which is a complex example of the simultaneous flows of volume
(water), heat, solutes and electricity within a porous material.
The physical complexity of this natural occurrence has
required that the phenomenon be reduced into a series of
scientific areas or related topics, which are presented as
separate chapters. A full account of the structure of the thesis
can be found in the introduction section.
The common areas covered in this work are mathematical
description of the loss of moisture by damp porous materials (i.e.
evaporation) and of the movement of moisture within unsaturated
porous materials both in terms of non linear "Diffusivity" type
expressions (Chapter Three) or more usefully in terms of non
linear "free energy" type expressions (Chapter Eight); capillary
suction developed in damp walls.
Other less common topics investigated are leaching of soluble
materials from the porous matrix and prediction of the consequent
increase in matrix permeability to fluid; electro kinetic aspects
of Rising Damp; coupling of transport processes within porous
Several of the topics discussed in this work are common to
several scientific disciplines giving rise to a 'looseness' and
'multiplicity' of nomenclature. To overcome this problem,
particular care and space has been devoted to explaining the
terminology used in this work, which is especially useful to
readers who are unfamiliar with this area of study.To conclude, the thesis covers the essential aspects of
Rising Damp and, as such, it may be used as a platform from which
the phenomenon can be investigated more comprehensively
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University