Use of Set Accelerating Admixtures in Dry-Mix Shotcrete
Publication: Journal of Materials in Civil Engineering
Volume 9, Issue 4
Abstract
Tests were carried out to study the influence of set accelerating admixtures on the properties of dry-mix shotcrete, especially its durability. A total of 27 mixtures were shot using two different types of cement (ASTM Type I with silica fume as partial cement replacement and ASTM Type III) and five different accelerators at various dosages. Half of these mixtures were shot with an air-entraining admixture. In addition to the determination of the setting time, the following properties were measured (on the hardened shotcrete): Air void characteristics, compressive strength, drying shrinkage, rapid freezing and thawing resistance and deicer salt scaling resistance. Results indicate that although all accelerators can reduce the initial and final setting times, some of them considerably decrease the durability, particularly the deicer salt scaling resistance. As a rule, better results were obtained with the mixtures containing the Type III cement than with those containing the Type I and silica fume. The tests confirm the importance of the use of an air-entraining admixture to obtain an adequate frost and deicer salt scaling resistance.
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References
1.
Beaupré, D., Talbot, C., Gendreau, M., Pigeon, M., and Morgan, D. R.(1994). “Deicer salt scaling resistance of dry- and wet-process shot- crete.”ACI Mat. J., 91(5), 487–494.
2.
Gebler, S. H., Litvin, A., and Mclean, W. and Schutz(1992). “Durability of dry-mix shotcrete containing rapid-set accelerators.”ACI Mat. J., 89(3), 259–262.
3.
Kusterle, W. A. (1993). “Regulating the strength development of shotcrete.”Proc., Spracyed Concrete, October 18–21, 1993, Norwegian Concrete Assn., Fagernes, Norway, 221–232.
4.
Lamontagne, A., Pigeon, M., Pleau, R., and Beaupré, D.(1996). “Use of air entraining admixture in dry-mix shotcrete.”ACI Mat. J., 91(1), 69–74.
5.
Lukas, W., and Kusterle, W. (1990). “The influence of water glass on the technological parameters of shotcrete.”Ref. Presented at the Engrg. Found. Conf: Shotcrete for Underground Support V, ASCE, New York, N.Y. 197–212.
6.
Morgan, D. R., Kirkness, A. J., McAskill, N., and Duke, N.(1988). “Freeze-thaw durability of wet-mix and dry-mix shotcretes with silica fume and steel fibers.” Cement, Concrete and Aggregates, 10(2), 96–102.
7.
Neville, A. M. (1981). Properties of concrete, 3rd Ed., Longman Scientific & Technical, Longman Group U.K. Ltd., Angleterre, U.K.
8.
Pleau, R. (1992). “La caractérisation du réseau de bulles d'air dans le béton durci comme outil d'évaluation de la durabilité au gel du béton,” PhD thesis, Dept. of Civ. Engrg., Laval Univ.
9.
Reading, J. T. (1981). “Durability of shotcrete.”Concrete Int., 3(1), 27– 33.
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Copyright © 1997 American Society of Civil Engineers.
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Published online: Nov 1, 1997
Published in print: Nov 1997
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