Mechanical Behavior

Arnaud, Laurent; Amziane, Sofiane; Nozahic, Vincent; Gourlay, Etiennec

doi:10.1002/9781118576809.ch5

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…Hempcrete is a group of green biomaterials that are used as load-bearing elements in houses and low-rise buildings. The compressive strength of LBMs is significantly higher than that of hempcrete (~0.1-1 MPa, Arnaud and Gourlay, 2012). Asphalt concrete is the most used road surface and base course material.…”

Section: Effect Of Non-micp Factors On Lbm Propertiesmentioning

confidence: 99%

Engineering living building materials for enhanced bacterial viability and mechanical properties

et al. 2021

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Summary Living building materials (LBMs) utilize microorganisms to produce construction materials that exhibit mechanical and biological properties. A hydrogel-based LBM containing bacteria capable of microbially induced calcium carbonate precipitation (MICP) was recently developed. Here, LBM design factors, i.e., gel/sand ratio, inclusion of trehalose, and MICP pathways, are evaluated. The results show that non-saturated LBM (gel/sand = 0.13) and gel-saturated LBM (gel/sand = 0.30) underwent distinct failure modes. The inclusion of trehalose maintains bacterial viability under ambient conditions with low relative humidity, without affecting mechanical properties of the LBM. Comparison of biotic and abiotic LBM shows that MICP efficiency in this material is subject to the pathway selected: the LBM with heterotrophic ureolytic Escherichia coli demonstrated the most mechanical enhancement from the abiotic controls, compared with either ureolytic or CO 2 -concentrating mechanisms from Synechococcus . The study shows that tailoring of LBM properties can be accomplished in a manner that considers both LBM microstructure and MICP pathways.

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Section: Effect Of Non-micp Factors On Lbm Propertiesmentioning

confidence: 99%