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Drying shrinkage and creep performance of geopolymer concrete
The creep behavior and drying shrinkage performance of fly ash geopolymer (GP) concrete mixtures have been investigated using equivalent grade 40-MPa ordinary Portland cement (OPC) concrete as the reference system. Drying shrinkage values, measured in accordance with AS 1012.13-1992, up to one year fell well below the nominal 700 μstrain limit, with GP concrete values typically less than 400 μstrain at 1 year. Variations in basic mean creep coefficient of concrete (Фcc.b), measured as the ratio of the creep strain to elastic strain for a specimen loaded at 28 days under constant stress of 0.4f c (f c – 28 day compressive strength) was monitored for up to 52 weeks. Values of Фcc.b obtained for steam-cured GP concrete was found to be of the order of 45% lower than corresponding OPC concrete. Based on these results, the effects of GP concrete mixtures on load-dependent (creep) deformations appear to be negligible. The paper further discusses factors that contribute to observed GP concrete creep deformation and drying shrinkage performance.
Drying shrinkage and creep performance of geopolymer concrete
The creep behavior and drying shrinkage performance of fly ash geopolymer (GP) concrete mixtures have been investigated using equivalent grade 40-MPa ordinary Portland cement (OPC) concrete as the reference system. Drying shrinkage values, measured in accordance with AS 1012.13-1992, up to one year fell well below the nominal 700 μstrain limit, with GP concrete values typically less than 400 μstrain at 1 year. Variations in basic mean creep coefficient of concrete (Фcc.b), measured as the ratio of the creep strain to elastic strain for a specimen loaded at 28 days under constant stress of 0.4f c (f c – 28 day compressive strength) was monitored for up to 52 weeks. Values of Фcc.b obtained for steam-cured GP concrete was found to be of the order of 45% lower than corresponding OPC concrete. Based on these results, the effects of GP concrete mixtures on load-dependent (creep) deformations appear to be negligible. The paper further discusses factors that contribute to observed GP concrete creep deformation and drying shrinkage performance.
Drying shrinkage and creep performance of geopolymer concrete
Sagoe-Crentsil, Kwesi (author) / Brown, Trevor (author) / Taylor, Alan (author)
Journal of Sustainable Cement-Based Materials ; 2 ; 35-42
2013-03-01
8 pages
Article (Journal)
Electronic Resource
English
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