Lime Hemp and Rice Husk-Based Concretes for Building Envelopes

Chabannes, Morgan; Garcia-Diaz, E.; Clerc, Laurent; Bénézet, Jean‐Charles; Becquart, F.

doi:10.1007/978-3-319-67660-9

Cited by 11 publications

(14 citation statements)

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“…The recorded absorption of carbon dioxide attributed to the production of miscanthus shives was due to a high biogenic CO 2 absorption inflow of −1.75 kgCO 2 eq/kg of miscanthus shives. The reported results show that the production of binders and their transportation contribute to~239.89 kgCO 2 eq/m 3 while miscanthus aggregates absorb~−276.16 kgCO 2 eq/m 3 . In all, the carbon footprint of binders is estimated at 0.76 kg CO 2 eq./kg of binder.…”

Section: Miscanthus Concrete Blocks: Base Case Resultsmentioning

confidence: 84%

“…These figures suggest that the optimisation of GWP100 impact level requires mix design methods involving a reduction of binder content and an increase of miscanthus aggregate content. The overall net global warming potential of miscanthus concrete is −134.74 kgCO 2 eq/m 3 . The major contributor remains the production of binders which accounts for 167.50 and 58.99 kg CO 2 eq/m 3 for CL90s and NHL3.5, respectively, for a total of 226.49 KgCO 2 eq/m 3 .…”

Section: Miscanthus Concrete Blocks: Base Case Resultsmentioning

confidence: 99%

“…The major contributor remains the production of binders which accounts for 167.50 and 58.99 kg CO 2 eq/m 3 for CL90s and NHL3.5, respectively, for a total of 226.49 KgCO 2 eq/m 3 . The carbonation of miscanthus blocks over the life cycle contributed for −161.96 kgCO 2 eq/m 3 .…”

Section: Miscanthus Concrete Blocks: Base Case Resultsmentioning

confidence: 99%

“…The reported results show that GHG emissions are the most affected environmental impact category through the variation of studied parameters across different scenarios. In fact, miscanthus blocks sequestrate GHG emissions that offset the binder production emissions to enable a storage of -134.7 kgCO 2 eq/m 3 . The environmental implications of the system to a regional level could be significant.…”

Section: Discussionmentioning

confidence: 99%

“…These composite materials are obtained by the association of a high fraction of vegetal aggregates with a mineral binder [2]. Typical bio-based aggregates are obtained from stems (hemp, flax, sunflower), straws (sorghum, maize and miscanthus) or trunks (woodchips) [3]. Hemp remains the most widely used in building materials and studied in literature as a result of longterm research and availability in continental Europe, mainly in France [4].…”

Section: Introductionmentioning

confidence: 99%

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Environmental performance of miscanthus-lime lightweight concrete using life cycle assessment: Application in external wall assemblies

Ntimugura

Vinai

Harper

et al. 2021

Sustainable Materials and Technologies

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In the UK context, miscanthus is a potential alternative perennial crop for the development of bio-based building materials. This paper presents the environmental benefits of using miscanthus shives in lightweight blocks and their potential application in wall assemblies. A systemic life cycle assessment (LCA) is carried out for miscanthus-lime blocks, and the effects of binder type and binder content are discussed. The environmental performance-based analysis reveals that miscanthus blocks can capture 135 kg CO 2 eq/m 3 for an assumed 100years life period. The impact analysis using the University of Leiden, institute of environmental science (CML) baseline (v4.4) method shows that 75% of the greenhouse gas emissions are attributable to the production of mineral binders. A reduction of binder to aggregate ratio from 2.0 to 1.5 reduces greenhouse gas emissions by 32.9%. The use of 10 wt% mineral additions can potentially stabilise blocks while having little effect on their overall environmental impacts. The environmental profiles of wall systems incorporating miscanthus-lime blocks have been evaluated in this this study. Combining miscanthus blocks with fired clay bricks enables a potential low carbon retrofitting technique for the current stock of residential buildings in the UK. Timber-framed system filled with miscanthus blocks enables a carbon storage of~97.3 kg CO 2 eq/m 2 , which presents a potential carbon offsetting strategy in new-build dwellings. Consideration should be given to the potential negative impacts related to agricultural activities for the production of miscanthus shives. The largest negative environmental impact was ozone layer depletion, where a relative difference of 12.8% was recorded between miscanthus timber-framed wall and a typical solid wall insulated with mineral wool. It appears that miscanthus-lime composites can substantially improve the environmental profile of wall assemblies and sustainability be applied in existing uninsulated masonry walls or incorporated in timber-framed new-build houses.

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Section: Miscanthus Concrete Blocks: Base Case Resultsmentioning

confidence: 84%

Section: Miscanthus Concrete Blocks: Base Case Resultsmentioning

confidence: 99%

Section: Miscanthus Concrete Blocks: Base Case Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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