https://orcid.org/0000-0002-0915-8539
Abstract
For this research, bridge deck concrete mixtures were investigated in order to lower the required cementitious content while maintaining prescriptive specifications. Cementitious contents of 362, 335, and 307 kg/m3 in conjunction with water-to-cementitious materials ratios of 0.40, 0.44, and 0.50 and fly ash levels of 0, 20, and 30 % were studied. Mixtures were tested for workability, entrained air, drying shrinkage, and the ability to maintain a 28 MPa compressive strength requirement. The compressive strength requirement was met by each mixture investigated and drying shrinkage was reduced as the cementitious content was lowered. A coarse limestone aggregate was used for the majority of this research; however, a smaller investigation indicated that sandstone and river gravel aggregates impacted compressive strength, drying shrinkage, and the static modulus of elasticity. Therefore, aggregate type should be investigated prior to use in reduced cementitious content bridge deck mixtures. Durability testing (such as permeability and freeze/thaw) should also be conducted prior to altering the prescribed cementitious content in concrete mixtures.
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