Title: SHOTCRETE FOR CONCRETE REPAIRS - FUNCTION AND DURABILITY
Abstract: This paper describes a Swedish project, due to continue, which is investigating the function and durability of shotcrete used for concrete repair, and to develop suitable test methods. Two test methods have been analysed for several different qualities of shotcrete. These methods test: (1) the strength of the bond between shotcrete layers and sawn concrete surfaces, for several different kinds of surface treatment; (2) the salt-frost resistance of concrete. The following main conclusions can be drawn from the test results: (1) the bond strength seems to be maximised, for both wet mix and dry mix shotcrete, when shotcreting is applied to dry surfaces; (2) the bond strength is very poor for wet mix shotcrete applied to a wet surface; (3) the quality, i.e. the strength and air content, of the concrete underlayer hardly seem to affect the bond strength; (4) wet mix shotcrete has better salt-frost resistance than dry mix shotcrete; (5) the variance of salt-frost resistance is high for dry mix shotcrete, probably because it is difficult to keep the water/cement ratio constant during the dry mix process; and (6) the project's methods for testing bond strength and salt-frost resistance seem to be suitable for evaluating shotcrete quality. For the covering abstract of the conference see IRRD 858334. The French title of this paper is:- Beton projete pour les reparations du beton - fonction et resistance. The German title of this paper is:- Spritzbeton zur Betonreparatur - Funktion und Bestaendigkeit.
Publication Year: 1989
Publication Date: 1989-01-01
Language: en
Type: article
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