Exploring the thermo-mechanical characteristics of modified rammed Earth treated with pulp mill fly ash and hydrated lime
Sarbesh Sharma, Sumi Siddiqua, Chinchu Cherian
In the proceedings of: GeoSaskatoon 2023: 76th Canadian Geotechnical ConferenceSession: Ground Improvement
ABSTRACT: Rammed Earth (RE) is an ancient construction technology with properties such as low embodied carbon and nature-based material. RE has been in practice for centuries but is still not widely approved as a standardized building material due to misconceptions about its strength and lack of structural design and building codes. This paper explores the mechanical and thermal properties of hydrated lime (HL) and pulp mill fly ash (PFA) treated RE materials. The two optimum RE design mixes with 5% and 10% PC treated with HL and PFA achieved up to 85% and 200% improvement in compressive strength, respectively, compared to the control specimen with 10% PC. The freeze-thaw durability and thermal conductivity results of treated RE specimens showed the significance of PFA and HL binders in reducing cement content and enhancing the strength of RE without compromising the weather durability and thermal characteristics.
RÉSUMÉ: Rammed Earth (RE) est une technologie de construction ancienne avec des propriétés telles qu'un faible taux de carbone incorporé et un matériau à base de nature. L'ER est pratiqué depuis des siècles mais n'est toujours pas largement approuvé en tant que matériau de construction standardisé en raison d'idées fausses sur sa résistance et de l'absence de conception structurelle et de codes de construction. Cet article explore les propriétés mécaniques et thermiques des matériaux RE traités à la chaux hydratée (HL) et aux cendres volantes d'usine de pâte à papier (PFA). Les deux mélanges de conception RE optimaux avec 5 % et 10 % de PC traités avec HL et PFA ont permis d'améliorer jusqu'à 85 % et 200 % de la résistance à la compression, respectivement, par rapport à l'échantillon témoin avec 10 % de PC. Les résultats de durabilité au gel-dégel et de conductivité thermique des échantillons de RE traités ont montré l'importance des liants PFA et HL dans la réduction de la teneur en ciment et l'amélioration de la résistance du RE sans compromettre la durabilité aux intempéries et les caractéristiques thermiques.
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Sharma, Sarbesh, Siddiqua, Sumi, Cherian, Chinchu (2023) Exploring the thermo-mechanical characteristics of modified rammed Earth treated with pulp mill fly ash and hydrated lime in GEO2023. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Sharma_GEO2023_126,
author = {{Sharma, Sarbesh}, {Siddiqua, Sumi}, {Cherian, Chinchu}}
title = {Exploring the thermo-mechanical characteristics of modified rammed Earth treated with pulp mill fly ash and hydrated lime }
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {Exploring the thermo-mechanical characteristics of modified rammed Earth treated with pulp mill fly ash and hydrated lime }
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }