Bio-stabilization of soft soil using cattle manure

Rao, SM and Sukumar, R and Joshua, RE and Rekapalli, M (2021) Bio-stabilization of soft soil using cattle manure. In: Proceedings of the Institution of Civil Engineers: Ground Improvement .

PDF pro_ins_civ_eng_gro_imp_2021.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

Abstract

To reduce carbon footprint in ground improvement technologies, environment-friendly materials are being explored as alternatives to lime and cement binders. Biological treatment methods are environment- friendly as they rely on natural activity of ubiquitous microbes to produce extracellular polymeric saccharides and calcite cements. Extracellular polymeric saccharides (EPS) extruded by microbes exhibit strong adhesion from growth of fibrous bridges and bonds between surfaces. In-situ polysaccharide secretion in soils to improve their engineering properties has not been examined. In this study, pulverized dried cattle manure cakes is used for in-situ EPS production in a synthetic soft soil specimen. The indigenous facultative anaerobes and aerobes in animal waste produce negatively charged EPS molecules in the soil specimen. Bridging of sand particles and embedment of cattle manure fibers in kaolinite aggregates caused an immediate increase in unconfined compressive strength of the stabilized specimen. EPS cementation improved soil strength by filling pores and engulfing kaolinite aggregates into bonded mass. Fiber reinforcement and bio-stabilization by cattle manure increased the unconfined compressive strength of the soil by 740. Replacing C-intensive lime/cement binders by cattle manure as a stabilizing agent has the potential to prevent release of 1 ton of CO2 to atmosphere per ton of lime/cement consumed. © 2021 ICE Publishing: All rights reserved.

Item Type:	Journal Article
Publication:	Proceedings of the Institution of Civil Engineers: Ground Improvement
Publisher:	ICE Publishing
Additional Information:	The copyright for this article belongs to ICE Publishing.
Keywords:	Bacteria; Binders; Calcite; Carbon footprint; Compressive strength; Fertilizers; Kaolinite; Lime; Soil cement; Soil conservation; Soils; Stabilization; Waste disposal, Biostabilization; Cattle manures; Cement binder; Extracellular; Ground improvement; Lime cement; Materials technology; Soft soils; Soil specimens; Unconfined compressive strength, Manures
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA) Division of Mechanical Sciences > Civil Engineering
Date Deposited:	22 Dec 2021 10:57
Last Modified:	22 Dec 2021 10:57
URI:	http://eprints.iisc.ac.in/id/eprint/70765

Actions (login required)

View Item