Influence of hydric solicitations on the morphological behavior of hemp concrete

  • Fares Bennai Laboratoire des Sciences de l’Ingénieur pour l’Environnement : LaSIE UMR - 7356 CNRS - Université de La Rochelle
  • Chady El Hachem
  • Kamilia Abahri
  • Rafik Belarbi
Keywords: hemp concrete, microstructure, digital image correlation, adsorption, strain

Abstract

The use of bio-based materials such as hemp concrete in the field of construction allows limiting environmental impacts and improving the energy performances of buildings. The aim of this paper is to understand the influence of adsorption and desorption of moisture in hemp concrete on its internal morphology and its dimensional variations. That’s why, the high porosity and the adsorption capacity of hemp concrete were discussed. Then, an experimental cell was developed to follow the geometric evolution over time of hemp concrete microstructure under hydric solicitations: humidification and drying. The digital image correlation was used to determine the strains fields on the surface of the material. This technique showed the behavior of this hygroscopic material subjected to different hygrometries. Indeed, the hemp shiv undergoes larger strains than the binder, thus affecting the morphology of hemp concrete. The results obtained highlighted the influence of the hydric state of hemp concrete on its very heterogeneous microstructure. It has also been revealed that the durability of the material can be affected by the dimensional variations caused by the relative humidity variations.

Influence of hydric solicitations on the morphological behavior of hemp concrete
Published
2019-07-05
How to Cite
Bennai, F., El Hachem, C., Abahri, K. and Belarbi, R. (2019) “Influence of hydric solicitations on the morphological behavior of hemp concrete”, RILEM Technical Letters, 4, pp. 16-21. doi: 10.21809/rilemtechlett.2019.80.
Section
Articles