Evaluation of FLWA and SRAs on autogenous deformation and long-term drying shrinkage of high performance concrete
DOI: 10.1016/j.conbuildmat.2016.05.068
Title: Evaluation of FLWA and SRAs on autogenous deformation and long-term drying shrinkage of high performance concrete
Journal Title: Construction and Building Materials
Volume: 119
Publication Date: 30 August 2016
Start Page: 53
End Page: 60
Published online: online 13 May 2016
ISSN: 0950-0618
Author: Tyler Deboodt , Tengfei Fu, Jason H. Ideker
Affiliations:
  • School Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA
  • Abstract: of pre-wetted fine lightweight aggregate (FLWA) as partial replacement of normal weight fine aggregate has been shown to effectively reduce the deleterious effects of autogenous shrinkage in high performance concrete (HPC). In this study, autogenous deformation of mortar, free drying shrinkage of concrete prisms, and mechanical property development with various shrinkage mitigation methods were examined. HPC drying shrinkage specimens were externally wet cured for 14 days or less to commensurate with field curing. Three different methods were evaluated to provide a potential reduction in drying and autogenous shrinkage; pre-wetted FLWA, shrinkage-reducing admixtures (SRAs) or the combination of pre-wetted FLWA and SRA. It was observed that the combination of shale FLWA and SRA was the most effective at reducing autogenous deformation, and was 84% less than the control. HPC mixtures with SRA reduced the drying shrinkage by 17% at 1095 days of drying. Furthermore, extending the external wet cure beyond three days had little effect on the magnitude of drying shrinkage for all mixtures when compared to a control mixture cured for 14 days.
    Accepted: 8 May 2016
    Received: 19 March 2016
    Revised: 5 May 2016
    Keywords: High performance concrete; Internal curing; Fine lightweight aggregate; Shrinkage reducing admixture; Autogenous deformation; Drying shrinkage
    Email: deboodty@onid.oregonstate.edu felixftf@gmail.com jason.ideker@oregonstate.edu

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