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A platform for research: civil engineering, architecture and urbanism
Autogenous shrinkage mitigation in HVFA mixtures with internal curing
This paper reports results from a series of experiments performed in an ongoing FHWA research program that is investigating the potential for using more fly ash in transportation structures. The paper focuses on test results from five mortar mixtures: a water-to-cement ratio (w/c) of 0.30 and water-to-cementitious materials ratio (w/cm) of 0.30 with 40% and 60% fly ash by volume with and without internal curing. A reduction in early age autogenous shrinkage is observed for HVFA mixtures. While initial autogenous shrinkage is reduced in HVFA mixtures, they are more prone to higher rates of shrinkage and cracking at later ages (after seven days). This can be related to pore size distribution as well as continued effects of hydration and the pozzolanic reaction. Chemical shrinkage and isothermal calorimeter results are shown to describe the rate of fly ash reaction at early ages. Internal curing can reduce the propensity for cracking.
Autogenous shrinkage mitigation in HVFA mixtures with internal curing
This paper reports results from a series of experiments performed in an ongoing FHWA research program that is investigating the potential for using more fly ash in transportation structures. The paper focuses on test results from five mortar mixtures: a water-to-cement ratio (w/c) of 0.30 and water-to-cementitious materials ratio (w/cm) of 0.30 with 40% and 60% fly ash by volume with and without internal curing. A reduction in early age autogenous shrinkage is observed for HVFA mixtures. While initial autogenous shrinkage is reduced in HVFA mixtures, they are more prone to higher rates of shrinkage and cracking at later ages (after seven days). This can be related to pore size distribution as well as continued effects of hydration and the pozzolanic reaction. Chemical shrinkage and isothermal calorimeter results are shown to describe the rate of fly ash reaction at early ages. Internal curing can reduce the propensity for cracking.
Autogenous shrinkage mitigation in HVFA mixtures with internal curing
Minderung der autogenen Schwindung von flugaschereichen Betonmischungen (HVFA) durch internes Erhärten
Varga, I. De la (author) / Castro, J. (author) / Weiss, J. (author)
2011
11 Seiten, 8 Bilder, 2 Tabellen, 28 Quellen
Conference paper
English
Autogenous Shrinkage Mitigation in HVFA Mixtures with Internal Curing
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