Thermal conductivity (TC) gives the heat flux transmitted
through a unit area of a material under a unit temperature gradient.
The TC of concrete is influenced by the mineralogical characteristics
of aggregate, and by the moisture content, density, and
temperature of concrete. TC of concrete depends also on curing
and compacting condition. Unal et al. [22] carried out a study on
TC of low-strength lightweight aggregate concrete (LWC) produced
with diatomite in different ratios and cement content.
A review of earlier studies reveals that Mineralogical character
of the aggregate would greatly influence the TC of concrete [23].
Aggregate with less TC produce the less conductive concrete
whereas the more conductive aggregates produce more conductive
concrete [24,25]. Thus, aggregate type can cause nearly twice an
increase in TC of concrete and this is depend on not only aggregate
composition but also depend on its degree of crystallization.
Aggregate with crystalline structure shows higher heat conduction
than amorphous and vitreous aggregate of the same composition
[26,27]. Porosity and moister content are another important factors
that effecting on the TC of concrete [24,25,27].