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Shrinkage and Creep Behaviour of High Fly Ash Content Concrete

This paper presents extensive test data on the shrinkage and creep behavior of high fly ash-content concrete that was made with ordinary portland cement and 50 percent by weight cement replacement with low-calcium Type F fly ash. The concrete mixtures were designed to have 20, 40, and 60 MPa 28 day cube strength with high workability and low water-to-composite cement ratio. The other variables were the exposure condition for the shrinkage tests and stress-strength ratio for the creep tests. The results showed that for structural concrete of 40 to 60 MPa, the ultimate shrinkage strain ranged from 400 to 500 x 10-6 m/m. The swelling strain amounted to 40 to 55 percent of the shrinkage value and indicated the importance and continued water curing for effective realization of full pozzolanic action of the fly ash. For the same concrete strength of 40 to 60 MPa, the specific creep and the creep coefficient were remarkably low ranging from 40 to 100 x 10-6 /MPa and 1.20 to 2.50, respectively. The data clearly confirm that the time-dependent deformations of well-designed high fly ash-content concrete compare extremely well with those of portland cement concrete.