Design and multi-physical properties of a new insulating concrete using sunflower stem aggregates and eco-friendly binders

Chabannes, Morgan; Nozahic, Vincent; Amziane, Sofiane

doi:10.1617/s11527-014-0276-9

Cited by 40 publications

(40 citation statements)

References 24 publications

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“…Water absorption occurs through the multi-scale porosity of the particles, especially for stems such as straw and hemp shiv, which transport the sap in the plant. This water content seems to be linked with the internal porosity of the material [41]. On the SEM pictures ( Fig.7), high internal porosity can be seen for straw and hemp shiv.…”

Section: Plant Aggregate Barley Straw Hemp Shiv Corn Cobmentioning

confidence: 85%

“…A particle size analysis was performed by image analysis using ImageJ software. This increasingly used method [40][41][42] is particularly interesting in the case of non-spherical particles. Size distribution and morphology (width and length) were determined using this method whereas traditional mechanical sieving analysis would have given only the width.…”

Section: Particle Size Analysismentioning

confidence: 99%

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Characterization of Barley Straw, Hemp Shiv and Corn Cob as Resources for Bioaggregate Based Building Materials

Laborel-Préneron

Magniont

Aubert

2017

Waste Biomass Valor

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Expanding the use of low-environmental impact materials in the field of building materials is a major aim in a context of sustainable development. These alternative materials should be non-polluting, eventually recycled, and locally available. Bioresources are already used in some building materials but few studies have investigated their relevance in such applications. The aim of this paper is to evaluate the suitability of three kinds of vegetal aggregates: barley straw, hemp shiv and corn cob. The availability of these bioresources, extracted from a French database, is discussed, as are their physical properties and chemical compositions. Their microstructure is described with SEM images and their particle size distributions are provided through image analysis. Sorption-desorption isotherms are measured by a Dynamic Vapour Sorption system. Bulk density, thermal conductivity and water absorption are also quantified. The results highlight a tubular structure for the three different aggregates, with low bulk density and thermal conductivity (0.044, 0.051 and 0.096 W.m-1 .K-1 respectively for straw, hemp shiv and corn cob) and high water absorption, especially for barley straw and hemp shiv (414 and 380% vs. 123% for corn cob). Their hygric regulation capacity is also sufficiently good, with a water sorption of between 20 and 26% at 95% of relative humidity. These plant aggregates could therefore be used as additions in an earth matrix, or a hydraulic, pozzolanic, air lime or gypsum binder, or just as loose-fill insulation material. However, future research should focus on their resistance to fire and bacterial growth to validate this approach.

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Section: Plant Aggregate Barley Straw Hemp Shiv Corn Cobmentioning

confidence: 85%

Section: Particle Size Analysismentioning

confidence: 99%

Characterization of Barley Straw, Hemp Shiv and Corn Cob as Resources for Bioaggregate Based Building Materials

Laborel-Préneron

Magniont

Aubert

2017

Waste Biomass Valor

View full text Add to dashboard Cite

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“…After a few days, the drying front moves from the surface towards the interior of the specimens and the drying rate controlled by the internal moisture transfer decreases sharply. This results in a decrease of relative humidity in the core of the specimens, which is slightly more pronounced for LHC (2). This is probably due to different topologies of the porous system, which have a strong impact on the duration of this second stage.…”

Section: Initial Conditioning Before Accelerated Carbonation Curing (mentioning

confidence: 97%

“…It can be described as follows [2]: Mix proportions are reported in Table 2. Specimens were designed with a binder-to-aggregate mass ratio (B/A) of 2.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

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Studying the hardening and mechanical performances of rice husk and hemp-based building materials cured under natural and accelerated carbonation

Chabannes

Garcia-Diaz

Clerc

et al. 2015

Construction and Building Materials

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Design of a Novel Hybrid Rice Straw/Husk Bio-Based Concrete Featuring Enhanced Mechanical and Hygrothermal Properties

Moussi

Clerc

Bénézet

2022

Waste Biomass Valor

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In order to reduce the consumption of energy and the emissions of greenhouse gases and CO 2 generated by the construction industry, bio-based concretes made of plant aggregates are increasingly used in the optimization of building envelopes thanks to their good hydrothermal performances, their renewable origin, and biodegradability. These insulation materials are considered as a promising alternative to synthetic systems made of mineral wool.This study investigates the use of a bio-based concretes performed with a mixture of eco-aggregates derived from rice plant and lime as thermal insulation materials. The effect of combining different proportions of rice straw (RS) with rice husks (RH) (100%, 66%, 50%, and 33%) on both mechanical and hydrothermal properties of bio-based concretes are investigated. The characterization seeks to evaluate the thermal conductivity, moisture buffer value (MBV) and mechanical compressive properties of the rice straw/rice husk concretes. Results show that the thermal conductivity of the bio-based concretes slightly decreased with increasing rice straw content. The MBV values measured showed that rice straw confers to concretes an excellent moisture buffering capacity according to the Nordtest project classi cation. The compression test result also revealed that rice straw concretes have high mechanical deformability. Straw concretes do not break but continuously deform. Statement Of NoveltyThe novelty of this manuscript lies in mixing rice straws and rice husk particles in order to design a hybrid lightweight insulation material. In general, rice husk and rice straw are used separately with various matrices, but the combination of rice husk and rice straw using lime as a matrix has not been yet explored. This manuscript evidences clearly that it is interesting to associate these two residues, in fact the negativity of one aggregate is neutralized and compensated by the positivity of another aggregates. The results showed that the hybrid concretes perform better compared to the pure rice husk concretes.

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Design and multi-physical properties of a new insulating concrete using sunflower stem aggregates and eco-friendly binders

Cited by 40 publications

References 24 publications

Characterization of Barley Straw, Hemp Shiv and Corn Cob as Resources for Bioaggregate Based Building Materials

Characterization of Barley Straw, Hemp Shiv and Corn Cob as Resources for Bioaggregate Based Building Materials

Studying the hardening and mechanical performances of rice husk and hemp-based building materials cured under natural and accelerated carbonation

Design of a Novel Hybrid Rice Straw/Husk Bio-Based Concrete Featuring Enhanced Mechanical and Hygrothermal Properties

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