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Research Article Open access CC BY 4.0

Measurement and Modelling of Water Content Effects on Thermal Properties of Compressed Soil Building Blocks

André Talla

Current Journal of Applied Science and Technology · pp. 520–533 · Published 6 Jan 2015

10.9734/BJAST/2015/15243

Abstract

Aims: The aim of this paper was to determine the thermal conductivity and the thermal effusivity of the compressed soil building blocks as a function of their water content. Study Design: Samples with dimensions 53x40x20 mm3 were produced for experiment. Eight containers and an oven were used to determine the equilibrium moisture content. The thermal properties of samples were obtained using a symmetrical hot strip method device. Place and Duration of Study: University of Yaounde I and National Advanced School of Engineering, Laboratory of Energizing, Water and Environment, between March 2014 and October 2014. Methodology: Thereafter, sorption isotherm of this building material was determined using the gravimetric static method of saturated salt solutions at 30°C (ambient average temperature), and GAB equation was applied to discuss the results. Then, a symmetrical hot strip method device was used to measure the thermal conductivity and the thermal effusivity of these samples, with their water content varying from 0 to a maximum value of 0.139 kgw.kgdb-1.An adapted device was developed to prevent water evaporation on the lateral faces of the samples. Results:Both thermal conductivity and thermal effusivity were modelled and the experimental results were processed to evaluate these thermal properties of compressed soil building blocks.A new simplified model, based on a physical approach with assumption of an ideal shrinkage of the material during the evaporation of water, was built. Conclusion: Calculated and experimental values of thermal properties were in good agreement, with a maximum standard error of 1.671 Wm-2K -1s1/2 for thermal effusivity and of 0.024 Wm-1K-1 for thermal conductivity. The suitability of this model for other buildings material will be further studied.

Compressed soil building blocks water content model thermal effusivity thermal conductivity

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Cited by 1

A New Simplified Model for Predicting of Water Content Effects on Thermal Conductivity of Hygroscopic Materials Buildings

A. Talla · 2016

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