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Characterization and degradation of a polyaryl ether based superplasticizer for use in concrete barriers in deep geological repositories
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.ORCID iD: 0000-0003-0208-1505
KTH, Superseded Departments (pre-2005), Chemistry.ORCID iD: 0000-0003-0663-0751
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.ORCID iD: 0000-0002-3239-5188
2018 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134Article in journal (Refereed) In press
Abstract [en]

Superplasticizers are important additives used in concrete barriers in geological waste repositories. Superplasticizers have been a major concern in the long-term assessments of safe geological disposal for radioactive waste since superplasticizers and their degradation products can act as complexing ligands and thereby increase the mobility of radionuclides. In this work a new type of superplasticizer, based on a polyaryl ether polymer, has been characterized. It was found that the superplasticizer combines the structural features of polycarboxylate ether based superplasticizers and sulfonated naphthalene-formaldehyde based superplasticizers and that it contains organophosphatecharged groups. A novel method for evaluating the rate of degradation of the superplasticizer under alkaline conditions was elaborated and the degradation products and rate constant of the process was determined. The results demonstrate that degradation occurs rapidly compared to the typical lifetime of a repository.

Place, publisher, year, edition, pages
Elsevier, 2018.
Keywords [en]
Waste disposal; Alkaline degradation; Polyaryl ether based superplasticizer
National Category
Chemical Engineering Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-228236DOI: 10.1016/j.apgeochem.2018.05.014OAI: oai:DiVA.org:kth-228236DiVA, id: diva2:1208798
Note

QC 20180611

Available from: 2018-05-20 Created: 2018-05-20 Last updated: 2018-06-11Bibliographically approved

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Jonsson, MatsForsberg, Kerstin

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