Print Email Facebook Twitter Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin Title Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin Author Li, Z. (TU Delft Materials and Environment) Nedeljković, Marija (TU Delft Materials and Environment) Chen, B. (TU Delft Materials and Environment) Ye, G. (TU Delft Materials and Environment; Universiteit Gent) Date 2019 Abstract This study investigates the effectiveness of metakaolin (MK)in mitigating the autogenous shrinkage of alkali-activated slag (AAS). It is found that the autogenous shrinkage of AAS paste can be reduced by 40% and 50% when replacing 10% and 20% slag with MK, respectively. By providing additional Si and Al, and decreasing the pH of the pore solution, the incorporation of MK retards the formation of aluminium-modified calcium silicate hydrate (CASH)gels, the main reaction products in the studied pastes. The chemical shrinkage and pore refinement are consequently mitigated, resulting in a substantial reduction in the pore pressure. Meanwhile, the elastic modulus of AAS paste is only slightly influenced after MK addition. As a result, the autogenous shrinkage of AAS is significantly mitigated by incorporating MK. In addition, the introduction of MK would extend the setting time, slightly decrease the compressive strength, but greatly increase the flexural strength of AAS. Subject Mechanical propertiesMetakaolinMitigationShrinkageSlag To reference this document use: http://resolver.tudelft.nl/uuid:ce564632-ce80-4c99-97f2-4792c665dbd9 DOI https://doi.org/10.1016/j.cemconres.2019.04.016 Embargo date 2021-05-07 ISSN 0008-8846 Source Cement and Concrete Research, 122, 30-41 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 Z. Li, Marija Nedeljković, B. Chen, G. Ye Files PDF Mitigating_the_autogenous ... cepted.pdf 1.39 MB Close viewer /islandora/object/uuid:ce564632-ce80-4c99-97f2-4792c665dbd9/datastream/OBJ/view