Recommendation of the RILEM TC 236-BBM: characterisation testing of hemp shiv to determine the initial water content, water absorption, dry density, particle size distribution and thermal conductivity

Abstract

This recommendation is the outcome of research conducted by a working group within the RILEM Technical Committee 236-BBM 'Bio-aggregate-based building Materials'. The work of the group related to the study of construction materials made from plant particles. The major raw material utilised being renewable, recyclable and easily available plant particles. These particles are obtained from the processing of hemp, flax, miscanthus, pine, maize, sunflower, bamboo and other plants. In this report, the outcome of the Round Robin Testing is centred on hemp because hemp shiv is the bio-aggregate that is the most widely used in building materials and the most studied in the literature. The first round robin test of the TC-BBM published in the State of The Art Report of Technical Committee 236-BBM 'Bioaggregate-based building Materials' was carried out This recommendation was prepared by a working group within RILEM TC-236 coming from eight laboratories:

Impact of Bio-Aggregates Properties on the Chemical Interactions with Mineral Binder, Application to Vegetal Concrete

“…The present paper aimed to study the impact of the water-soluble components extracted from seven distinct bio-aggregates -five hemp shives and two agricultural by-products (corn and sunflower bark particles) as alternative bio-aggregates for vegetal lightweight concrete -on the hydration and hardening mechanisms of a pozzolanic binder as well as on the mechanical performances of plant concretes. Beforehand, the bark particles of the seven bio-aggregates were characterized according to the recommendations of RILEM TC 236-BBM (Amziane et al 2017). Bulk density, dust content, particle size distribution, circularity and water absorption capacity were determined on hemp shives and on bark particles extracted from corn and sunflower stalks.…”

“…The physical characterization of hemp shives was realized according to the RILEM Technical Committee 236-BBM recommendations on bio-based materials (Amziane et al 2017).…”

“…The first part of the study focused on the plant particles characterization. According to the recommendations of RILEM Technical Committee 236-BBM (Amziane et al 2017), bulk density, particle size distribution and water absorption capacity were determined on different bio-aggregates. Because of the variability of hemp properties due to their nature, five hemp shives are studied.…”

Glycerolipid Composition and Advanced Physicochemical Considerations of Sacha Inchi Oil toward Cosmetic Products Formulation

“…The appropriate amount sample was determined, when an obscurance level between 2% and 8% was reached in the equipment. Drop size data were expressed as D [4,3] [26][27][28] and all the measurements were conducted in triplicate.…”

Chemical and multi-physical characterization of agro-resources’ by-product as a possible raw building material

“…The open porosity is also calculated from bulk density and skeleton density. The measurement of bulk density, PSD, water absorption and thermal conductivity are based on the recommendations of the Rilem Technical Committee 236 BBM (Bio-aggregate based Building Materials) (Amziane et al, 2017a). The protocol of each measurement is described hereafter.…”