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EVALUATION OF EXPANSION ATTAINED TO DATE BY ASR-AFFECTED CONCRETE

EVALUATION OF EXPANSION ATTAINED TO DATE BY ASR-AFFECTED CON...

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第十二届国际混凝土碱集料反应会议

作者： Nizar Smaoui Marc-AndréBérubé Benoit Fournier Benoit Bissonnette Benoit Durand Service d’Expertise en Materiaux Inc. 1400 Boul. du Parc Technologique QC Canada G1P 4R7 CRIB Departement de geologie et de genie geologique Universite Laval Sainte-Foy QC Canada G1K 7P4 ICON-MTL/CANMET NRCan 405 Rochester Ottawa ON Canada K1A 0G1 IREQ Hydro-Quebec 1740 ***-Boulet VarennesQCCanada J3X 1S1 CRIB Département de génie civilUniversté lavalSainte-FoyQCCanadaG1K 7P4

＜正＞ The expansion to date of concrete from a structure in service affected by alkali-silica reactivity （ASR） is a crucial parameter in the evaluation of this structure. In a first phase, relationships were obtained in laboratory between the expansion generated by ASR and the "stiffness damage test" （SDT）, the "damage Rating Index" （DRI）, and the surface cracking of concrete specimens made with various reactive aggregates and kept in the laboratory under constant conditions of high temperature and humidity. A second phase allowed verifying the validity of these relationships in the case of concrete elements made in laboratory but exposed outdoors. This second phase allowed to highlight the very random character of the surface cracking, very important distinctions between the laboratory concrete and the exposed concrete concerning the defects observed during the DRI test, while recognizing the higher reliability of the SDT method, and this despite the large influence of the type of reactive aggregate involved on the results of this test. The third part of the study had the goal of applying the three methods studied to three structures in service affected by ASR in the Quebec City area （Canada）, all made with siliceous limestone aggregates. This time, the surface cracking allowed estimating rather well the expansion of the concrete involved provided it was measured on the most exposed sections of the structures under study. The DRI did not allow in the present case to differentiate the most visually and mechanically affected concretes from the ones that are less affected. The SDT method proved to be the most interesting for the evaluation of the expansion to date of concrete structures affected by ASR even if it is aggregate-dependent and seems to underestimate expansions in the case of pre-stressed elements.

关键词： Alkali-silica reaction damage rating index Expansion stiffness damage test Surface cracking.

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