Abstract
This study deals with the impact of the amount and granulates type of Typha Australis on the hygric performance of building material based on clay. Three compositions are tested: Two of them have the same proportion of granulate but differ by their morphology (transversal or longitudinal cut of the plant). The third composition contains less Typha granulates resulting from the transversal cut. Hygric properties are experimentally, such as permeability, sorption isotherms, and moisture buffering value. Results show an influence of the Typha granulate and its volume content on the hygrothermal properties of the material due to the porosity.
Highlights
Bio-based composites are becoming more and more used as thermal insulating material for reducing building energy consumption due to their interesting technical performances [1,2,3,4]
Many investigations have been conducted to study their hygric behaviour, as for instance, the moisture buffering value (MBV) of a new agromaterial based on hemp and starch [3]
Measurements show that, at equivalent binder dosage, samples having chips from transverse cut present a lower moisture buffering value (3.71 g.m2.%RH-1) compared to those made by Typha fibers from longitudinal cut (4.3 g.m-2.%RH-1)
Summary
Bio-based composites are becoming more and more used as thermal insulating material for reducing building energy consumption due to their interesting technical performances [1,2,3,4]. Many investigations have been conducted to study their hygric behaviour , as for instance, the moisture buffering value (MBV) of a new agromaterial based on hemp and starch [3]. Results show that such materials are considered as excellent humidity regulator (MBV of 3.39 g m-2 %RH-1). Typha Australis [10,11,12] shows a good hygrothermal performances The aim of this contribution is to elaborate and study the hygric properties of Typha and clay mixtures as a function of the ratio and morphology of two different types of Typha fibres: one obtained from a transversal cut (T) and the other from a longitudinal cut (L). Experimental results are presented and the impact of the type of Typha chips as well as the ratio on the material’s behaviour are discussed
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