Conference Papers Year : 2024

Potential of local agricultural by-products for vegetal concrete design

Abstract

This study focuses on the evaluation of the potential of local agricultural by-products: flax shiv, sunflower pith and sunflower bark as alternative particles in vegetal concretes. The vegetal aggregates are combined with three different binders and compared with hemp shiv as reference. Composites are formulated at constant binder dosage. Their microstructure, hygrothermal and mechanical properties are explored. X-ray tomography gives information about composites’ porosities, which is around 80% in the case of sunflower composites. Thermal conductivity depends mainly on the density of the composite, which is lower for earth composites and for those containing sunflower pith. Young’s modulus is higher for hemp concretes than for the other composites studied in the case of hydraulic binders. In the case of earth binder, composites with sunflower pith show higher modulus than those of hemp composite. Sorption isotherms of composites are similar except for sunflower pith for which the sorption isotherm is lower. The type of binder also has an influence on the sorption capacity. Moisture Buffer Value (MBV) is “excellent” for composites made of flax shiv and sunflower bark, and “good” for those made of hemp shiv and sunflower pith. Overall, sunflower pith is the local aggregate offering to the composites the best compromise between hygrothermal and mechanical properties.

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Dates and versions

hal-04974212 , version 1 (03-03-2025)

Identifiers

  • HAL Id : hal-04974212 , version 1

Cite

Herinjaka Haga Ratsimbazafy, Aurélie Laborel-Préneron, Camille Magniont, Philippe Evon, Pascale Sénéchal. Potential of local agricultural by-products for vegetal concrete design. 78th RILEM Annual Week & RILEM Conference on Sustainable Materials & Structures, Aug 2024, Toulouse, France. ⟨hal-04974212⟩
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