The thermal conductivity of three normal granular expanded vermiculite aggregate concretes, and six plate-like (approximately disc shaped) expanded vermiculite aggregate concretes, in the density range 500–1100 kg m−3, together with a sample of the cement paste matrix material of density 1428 kg m−3 has been measured. The plate-like vermiculite concrete was found to have conductivities some 20 to 30% less, for any given density, than the granular type. The large reduction in conductivity has been explained in terms of the shape of the inclusions, based on equations derived in an earlier paper.
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References
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