Abstract
Precast, prestressed concrete (PSC) planks in the decks of 2 bridges (denoted as MC and BC) exhibited cracking in the soffit of the planks, and alkali-aggregate reaction (AAR) was suspected. Two PSC planks from each bridge were examined to identify the causes of the cracking and determine their remedial needs based on residual strength and expansion properties. From petrographic examination and scanning electron microscopy, strong AAR was found to be the cause of cracking for both bridges. Investigation of strength properties of the concrete cores showed significant loss in strength properties had occurred of ~30% in compressive strength and up to 50% in elastic modulus. Residual expansion of the cores was determined in the laboratory under conditions of elevated temperature and humidity and it was found that the expansion potential of the cores examined was relatively small. The cast-in-place columns of the MC bridge were also examined and found to be free of AAR, of adequate strength, and in sound condition. Rehabilitation options for the bridges are discussed.
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