Effect of a micro-copolymer addition on the thermal conductivity of fly ash mortars

Durán Herrera, A. y Campos Dimas, J.K. y Valdez Tamez, P.L. y Bentz, Dale P. (2016) Effect of a micro-copolymer addition on the thermal conductivity of fly ash mortars. Journal of Building Physics, 40 (1). pp. 3-16. ISSN 1744-2591

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Resumen

In this study, a copolymer composed of hollow spherical particles with an average particle size of 90 µm was evaluated as a lightweight aggregate in Portland cement-fly ash mortars to improve the thermal conductivity (k) of the composite. Mortars were produced for three different water/binder ratios by mass (w/b), 0.4, 0.5 and 0.6. Optimized proportions were obtained for a minimum target compressive strength of 35 kgf/cm2 (3.4 MPa) according to the requirements of Mexican standards for non-structural masonry units. Thermal conductivity was determined for dry and saturated samples through the transient plane technique with average results of 0.16 W/(m∙K) and 0.31 W/(m∙K), respectively. These values represent an increment of 23 % and a reduction of 33 %, respectively, in comparison to an efficient Portland cementbased commercially available thermal insulator.

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