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Pro084-1

SLOW/LATE AGGREGATES ENDANGER CONCRETE STRUCTURES DUE TO ASR



Author(s): H.W. Reinhardt, O. Mielich
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 923-935
Total Pages: 961
Language : English


Abstract: Slow/late aggregates manifest the deleterious action of alkali-silica reaction (ASR) only after 15 to 20 years. To better understand this behavior a series of concretes with three slowly reacting aggregates and two binders has been investigated. One binder was a Portland cement CEM I with 1.24 % by mass Na2O equivalent. The other binder was a Portland cement with phonolite as supplementary cementitious material. The aggregates were greywacke, quartz- porphyry and crushed gravel from German sources. The specimens were exposed in a fog room for 560 days. Compressive strength, tensile strength, static and dynamic modulus of elasticity were measured at fixed intervals. While the mechanical properties of concretes with CEM I degraded substantially during exposure the concretes with phonolite were affected only to a few percent. It turned out that the tensile strength and the static modulus of elasticity are suitable properties for the re-evaluation and assessment of ASR affected concrete structures.


Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00


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