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Process stabilization–solidification and physicochemical factors influencing strength development of treated dredged sediments
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0003-3078-1883
Ecoloop, Stockholm.
Statens Geotekniska Institut, Linköping.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
Number of Authors: 42016 (English)In: Geo-Chicago 2016: Sustainable Waste Management and Remediation / [ed] Nazli Yesiller; Dimitrios Zekkos; Arvin Farid; Anirban De; Krishna R. Reddy, Chicago, Illinois: American Society of Civil Engineers (ASCE), 2016, Vol. GSP 273, p. 532-545Conference paper, Published paper (Refereed)
Abstract [en]

Process stabilization–solidification (PSS) is a convenient technology for amending high water content dredged sediments (DS) with binders. The PSS equipment comprises of a chassis that carries a pugmill and silos of up to four binders. Primary binders such as cement can be supplemented with pozzolanas materials. In this study, physicochemical interactions of single and composite (ternary) binders on strength development of treated DS are examined based on laboratory and a large–scale field tests. The findings of this study show that fixed amount of cement content at increasing initial water content of the DS contribute to decreased level of calcium ions in the blend. Organic matter in the DS retains calcium ions liberated during cement hydration. This causes delay in formation of calcium hydroxide (CH), nucleation and crystallization of calcium silicate hydrates (CSH). Delay in the formation of CH hinders pozzolanic reaction of mineral admixture. Furthermore, increased amount of free water surrounding the stabilized mass causes weakening effect on CSH bond and pH neutralization. It is concluded that strength development of dredged sediments will depend on the amount of cement in the blend in relation to mineral admixture, initial water content of the DS, and the amount of organic matters.

Place, publisher, year, edition, pages
Chicago, Illinois: American Society of Civil Engineers (ASCE), 2016. Vol. GSP 273, p. 532-545
Series
Geotechnical Specila Publication, ISSN 0895-0563 ; 273
Keywords [en]
stabilization-solidification, Fly ash, slag, unconfined compressive strength, cement, dredged sediments, unconfined compressive strength, stabilization-solidification, Fly ash, cement, dredged sediments, unconfined compressive strength, stabilization-solidification, cement, Fly ash, slag, Civil engineering and architecture - Geoengineering and mining engineering, Materials science - Construction materials, Civil engineering and architecture - Building engineering
Keywords [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik, Teknisk materialvetenskap - Konstruktionsmaterial, Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-27712DOI: 10.1061/9780784480168.053Scopus ID: 2-s2.0-84985034430Local ID: 13eb01f1-4de8-45a4-965f-a47055833fb3ISBN: 978-0-7844-8016-8 (electronic)OAI: oai:DiVA.org:ltu-27712DiVA, id: diva2:1000901
Conference
GEO-CHICAGO 2016: Sustainability, Energy, and the Geoenvironment, : Soil Remediation Using Solidification/Stabilization 14/08/2016 - 18/08/2016
Note

Godkänd; 2016; 20151001 (makusa)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-08Bibliographically approved

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Makusa, GregoryKnutsson, Sven

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