Title: Durability of Precast Veneer Panels

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Publication: CIA

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Date: 2/13/2011

Abstract:
Concern has been expressed by a number of specifying engineers and architects as to the suitability of veneering of precast concrete façade panels. This has come about because of a number of reported cases of delamination and spalling of existing panels. Further, it is generally assumed that bond can only be achieved if the second layer of concrete is placed onto the first layer while it is still fresh. It follows from this that delamination occurs as a result of delays in the placing of one layer of concrete onto the other. This paper presents the findings of a study into the suitability of veneering as a technique for constructing precast concrete façade panels. This study is in two parts, a review of the performance of a number of buildings with a veneered precast façade, as well as laboratory testing to determine the effects of timing on the bond of veneers. The results show that sufficient bond can develop between the veneer and the backing concrete when the delay between the casting of the veneer and the backing concrete is up to 2.5 hours.