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The Thermal Conductivity of Low Density Concretes Containing Perlite
Abstract
The thermal conductivity, k, of low density
concretes made from Portland cement and perlite has
been measured near room temperature using an
unguarded linear heat flow apparatus. Perlite
based concretes having densities from 44.3 lb/ft3
to 66.6 lb/ft3 were found to have thermal
conductivities from 1.55 Btu·in/ft2 ·h·°F to 2.89
Btu·in/ft2 ·h·°F. The measured k can be correlated
against density and the results agree with
previously published results. The thermal
resistance, R-value, of concrete blocks made with
low density concretes and having core regions
filled with perlite powder is calculated to be in
the range of 7 to 12 ft2 ·h·°F/Btu. The material,
therefore, has potential for energy conservation
applications.
The compressive strength of concretes
generally decreases with density and this is true
for the perlite products. The very low density
concretes had measured compressive strengths below
500 lb /in2 and such material is unsuitable for
many applications. Intermediate density products,
however, have compressive strengths above 2000
lb /in2. Applications for the perlite concretes
will, therefore, have to compromise between load
bearing capability and energy conservation
objectives.
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Citation
Yarbrough, D. W. (1985). The Thermal Conductivity of Low Density Concretes Containing Perlite. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /93149.