### Modelling The Effects of Aggregate Size on Alkali Aggregate Reaction Expansion

#### Abstract

This work aims at developing models to predict the potential expansion of concrete containing alkali-reactive aggregates. The paper gives measurements in order to provide experimental data concerning the effect of particle size of an alkali-reactive siliceous limestone on mortar expansion. Results show that no expansion was measured on the mortars using small particles (0.5-1.0 mm) while the particles (1.0–2.0 mm) gave the largest expansions (0.217%). Two models are proposed, the first one studies the correlations between the measured expansions and the size of aggregates, the second one calculates the thickness of the porous zone necessary to take again all the volume of the gel created.

#### Keywords

#### Full Text:

PDF#### References

B. Capra, A. Sellier, “Orthotropic modeling of alkali-aggregate reaction in concrete structures: numerical simulations”, Mechanics of Materials, Vol. 35, No. 8, pp. 817–830, 2003

A. Sellier, E. Bourdarot, S. Multon, M. Cyr, E. Grimal, “Assessment of the residual expansion for expertise of structures affected by AAR”, 13th International Conference on Alkali-Aggregate Reaction in Concrete, Trondheim, Norway, pp. 1004–1013, 2008

Z. P. Bazant, A. Steffens, “Mathematical model for kinetics of alkali silica reaction in concrete”, Cement and Concrete Research, Vol. 30, No. 3, pp. 419–428, 2000

A. Sellier, J. P. Bournazel, A. Mébarki, “Modelling the alkali aggregate reaction within a probabilistic frame-work”, 10th International Conference on Alkali-Aggregate Reaction in Concrete, Melbourne, Australia, pp. 694–701, 1996

S. Poyet, A. Sellier, B. Capra, G. Foray, J. M. Torrenti, H. Cognon, E. Bourdarot, “Chemical modelling of Alkali Silica reaction: influence of the reactive aggregate size distribution”, Materials and Structures, Vol. 40, No. 2, pp. 229–239, 2007

D. McConnell, R. C. Mielenz, W. Y. Holland, K. T. Greene, “Cement-aggregate reaction in concrete”, Journal of the American Concrete Institute, Vol. 44, No. 2, pp. 93–128, 1947

T. M. Kelly, L. Schuman, F. B. Hornibrook, “A study of alkali-silica reactivity by means of mortar bar expansions”, Journal of the American Concrete Institute, Vol. 45, No. 1, pp. 57–80, 1948

S. Diamond, N. Thaulow, “A study of expansion due to alkali-silica reaction as conditioned by the grain size of the reactive aggregate”, Cement and Concrete Research, Vol. 4, No. 4, pp. 591–607, 1974

D. W. Hobbs, W. A. Gutteridge, “Particle size of aggregate and its influence upon the expansion caused by the alkali-silica reaction”, Magazine of Concrete Research, Vol. 31, No. 109, pp. 235–242, 1979

M. Kawamura, K. Takemoto, S. Hasaba, “Application of quantitative EDXA analyses and microhardness measurements to the study of alkali-silica reaction mechanisms”, 6th International Conference of Alkalis in Concrete, Copenhague, Denmark, pp. 167–174, 1983

R. E. Oberholster, G. Davies, “An accelerated method for testing the potential alkali reactivity of siliceous aggregates”, Cement and Concrete Research, Vol. 16, No. 2, pp.181-89, 1986

D. Lu, B. Fournier, P. E. Grattan-Bellew, “Evaluation of accelerated test methods for determining alkali-silica reactivity of concrete aggregates”, Cement and Concrete Composites, Vol. 28, No. 6, pp. 546–554, 2006

S. Multon, M. Cyr, A. Sellier, P. Diederich, L. Petit, “Effects of aggregate size and alkali content on ASR expansion”, Cement and Concrete Research, Vol. 40, No. 4, pp. 508–516, 2010

M. Moissan, “Contribution to the mastery of alkali silica reaction by adding fine reactive aggregates in concrete”, Doctoral thesis, Toulouse, 2005 (“Contribution à la maitrise de la réaction alcali silice par ajout de fines de granulats réactifs dans le béton”, Thèse de doctorat, Toulouse, 2005)

L. S. Dent-Glasser, N. Kataoka, “The chemistry of alkali-aggregate reaction”, 5th International Conference on Alkali-Aggregate Reaction in concrete, Cape Town, South Africa, 1981.

S. Chatterji, N. Thaulow, “Some fundamentals of alkali-silica reaction”, 11th International Conference on Alkali-Aggregate Reaction in Concrete, Québec City, Québec, pp. 21-29, 2000

H. Wang, J. E. Gillott, “Mechanism of alkali-silica reaction and the significance of calcium hydroxide”, Cement and Concrete Research, Vol. 21, No. 4, pp. 647-654, 1991

S. Poyet, “Study of the degradation of concrete structures affected by alkali-silica reaction: Experimental approach and multi-scale numerical modeling of damage in an environment variable hydro-chemo-mechanical”, Doctoral thesis, University of Marne-La-Vallée, 2003. (“Etude de la dégradation des ouvrages en béton atteints par la réaction alcali-silice : Approche expérimentale et modélisation numérique multi-échelles des dégradations dans un environnement hydro-chemo-mécanique variable”, Thèse de doctorat, Université de Marne-La-Vallée, 2003)

C. F. Dunant, K. L. Scrivener, “Effects of aggregate size on alkali–silica-reaction induced expansion”, Cement and Concrete Research, Vol. 42, No. 6, pp. 745-751, 2012

eISSN: 1792-8036 pISSN: 2241-4487