Journal
BUILDING AND ENVIRONMENT
Volume 44, Issue 9, Pages 1935-1942Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2009.01.007
Keywords
Hygrothermal; Porous materials; Stabilised rammed earth; Heat & mass transfer and storage
Funding
- Physical Sciences Research Council
- Engineering and Physical Sciences Research Council [EP/E025684/1] Funding Source: researchfish
- EPSRC [EP/E025684/1] Funding Source: UKRI
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Suitable experimental methodologies for determining the hygrothermal properties of stabilised rammed earth (SRE) materials have been presented along with comparative experimental data for three different SRE mix designs with parametric analysis of the influence of these variables on material function. Higher bulk porosity corresponds to reduced volumetric heat capacity (C), but increased sorptivity (S) and vapour permeance (W). Since bulk porosity and void size distribution (VSD) are interdependent variables, it follows that for constant particle size distribution (PSD) and compaction energy an increase in porosity results in an increase in the mean pore radius, (r) over bar for a material. This explains why the magnitude of liquid/vapour transfer (S and W) terms are inversely related to the hygroscopic moisture capacity, xi since the capillary potential, Psi will increase when the mean pore diameter decreases. The implications are that the hygrothermal properties of SIZE materials can be designed and predicted by manipulating particle size distribution and compaction energy. (C) 2009 Elsevier Ltd. All rights reserved.
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