Title:
Performances of Hemp Concretes: from Microscopic to Functional Properties
Author(s):
Guillaume Delannoy, Sandrine Marceau, Philippe Glé, Etienne Gourlay, Marielle Guéguen-Minerbe, Dinarzed Diafi, Issam Nour, Sofiane Amziane, and Fabienne Farcas
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
13.1-13.12
Keywords:
Biobased materials, building insulation, hemp concrete, porosity, functional properties
DOI:
10.14359/51701051
Date:
8/1/2017
Abstract:
Biobased materials are increasingly used for building insulation. Hemp concrete (hemp aggregates and mineral binder) is an efficient thermal insulation material containing renewable resources. It provides also comfort in habitation thanks to its acoustical and hygrothermal properties. In this study, two hemp concrete “wall” formulations are manufactured with one type of hemp shiv and two
commercial binders: natural prompt cement (rapid hardening) and a formulated binder based on lime. Ninety days of curing (65% RH – 20°C/68°F) ensures the hardening of the materials. The influence of binders on the microstructure and its relation with functional properties is investigated in this paper. Similar behaviors in thermal conductivity, acoustical performances and hygroscopic properties are observed for the two binders. No differences are measured through porosity, which can explain the similar functional
properties behaviors as they partly depend on porosity. Both formulations have low compressive strength compared with hemp concretes in literature. This could be due to the shiv extractible compounds that impact the hydration of the mineral binders.
Related References:
1. Lucon O., D. Ürge-Vorsatz, A. Zain Ahmed, H. Akbari, P. Bertoldi, et al., Buildings. In: “Climate Change 2014: Mitigation of Climate Change. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change”, Cambridge University Press, Cambridge, United
Kingdom and New York, NY, USA.
2. La Rosa A.D., Recca A., Gagliano A., Summerscales J., Latteri A., Cozzo G., Cicala G., « Environmental impacts and thermal insulation performance of innovative composite solutions for building applications », Construction building Materials, V. 55, 2014, pp. 406-414.
3. Cérézo V., “Propriétés mécaniques, thermiques et acoustiques d’un matériau à base de particules végétales: approche expérimentale et modélisation thérorique”, PhD thesis, Ecole Nationale des Travaux Publics de l’Etat, 2005.
4. Gourlay E., “Caractérisation expérimentale des propriétés mécaniques hygrothermiques du béton de chanvre : détermination de l’impact des matières premières et de la mise en oeuvre", PhD thesis, ENTPE, 2014.
5. Glé P., “Acoustique des matériaux du bâtiment à base de fibres et particules végétales – Outils de caractérisation, modélisation et optimisation“, PhD thesis, ENTPE, 2013.
6. Marceau S., Glé P., Guéguen-Minerbe M., Gourlay E., Moscardelli S., Nour I., Amziane S., “Influence of accelerated aging on the properties of hemp concretes“, Construction and Building Materials, 2016, http://dx.doi.org/10.1016/j.conbuildmat.2016.11.129.
7. Collet F., Bart M., Serres L., Miriel J., “Porous structure and water vapour sorption of hemp-based materials”, Construction and Building Materials, V. 22, 2008, pp. 1271-1280.
8. Silva B.A., Ferreira Pinto A.P., Gomes A., “Natural hydraulic lime versus cement for blended lime mortars for restoration works”, Construction and Building Materials, V. 94, 2015, pp. 346-360.
9. Nozahic V., “Vers une nouvelle demarche de conception des bétons de végétaux lignocellulosiques basée sur la comprehension et l’amélioration de l’interface liant/vegetal”, PhD thesis, Université Blaise Pascal Clermont II, 2012.
10. Magniont C., “Contribution à la formulation et à la caractérisation d’un écomatériau de construction à base d’agroressources”, PhD thesis, Université de Toulouse, 2010.
11. Diquelou Y., Gourlay E., Arnaud L., Kurek B., “Impact of hemp shiv on cement setting and hardening: Influence of the extracted components from the aggregates and study of the interfaces with inorganic matrix”, Cement and Concrete Composites, V. 55, 2015, pp. 112-121.
12. Amziane S., Collet F., Lawrence M., Magniont C., Picandet V., Sonebi M., “Recommendation of RILEM TC 236-BBM: characterization testing of hemp shiv to determine the initial water content, water absorption, dry density, particle size distribution and thermal conductivity”, 2016.
13. Gourlay E., Glé P., Marceau S., Foy C., Moscardelli S., “Effect of water content on the acoustical and thermal properties of hemp concretes”, Construction and Building Materials, 2016,
http://dx.doi.org/10.1016/j.conbuildmat.2016.11.018.
14. Glé P., Gourdon E., Arnaud L., “Modelling of the acoustical properties of hemp particles”, Construction and Building Materials, V. 37, 2012, pp. 801-811.
15. M. Arandigoyen, J.I. Alvarez, “Blended pastes of cement and lime: Pore structure and capillary porosity”, Applied Surface Science, V. 252, Issue 23, 2006, pp. 8077-8085.
16. Niyigena C., et al., “Variability of the mechanical properties of hemp concrete”, Materials Today Communications, V. 7, 2016, pp. 122-133.
17. Nguyen, T.T., “Contribution à l’étude de la formulation et du procédé de fabrication d’éléments de construction en béton de chanvre” PhD thesis, Université de Bretagne Sud, 2010.
18. Sedan D., Pagnoux C., Smith A., Chotard T., “Mechanical properties of hemp fibre reinfored cement: Influence of the fibre/matrix interaction”, Journal of the European Ceramic Society, V. 28, 2008, pp. 183-192.
19. Frybort S., Mauritz R., Teischinger A., Müller U., “Cement bonded composites – A mechanical review”, BioResources, V. 3, 2008, pp. 602-626.