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Evaluation of ground granulated iron blast-furnace slag : grade-100.
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    Currently, the use of grade-120 Granulated Ground Blast Furnace Slag (GGBFS) is incorporated into the specifications of LA DOTD concrete mixes. This study evaluates grade-100 GGBFS and its effect on the properties of hydraulic cement concretes used in structures and pavements construction. Four mix designs were used for this study, two structural and two pavements, with varying amounts (15%, 30%, and 50%) of grade-100 GGBFS used as a by-weight substitution for cement. Additionally in order to simulate field conditions, the study used three different temperatures (50°F, 73°F and 90°F) for the components at mixing and curing conditions. This study looked at the effects of slag on workability, durability, and the compressive and flexural strengths of the concrete. How grade-100 GGBFS compared to grade-120 GGBFS in its affect on the concrete’s physical properties and set times was also crucial in determining its acceptability for LA DOTD concrete structures and pavements.

    Similar to the grade-120 GGBFS, test results indicate that concretes with grade-100 GGBFS substitutions exhibited delays in set times and in compressive strengths at an early age as compared to conventional concrete mixes. Permeability was reduced in those concretes that incorporated GGBFS as opposed to the conventional mixes.

    Recommendations will be made from this study to incorporate grade-100 GGBFS into the specifications of Louisiana concrete mixes. It will be recommended that grade-100 GGBFS have the same allowances and restrictions that are currently specified for grade-120 GGBFS.

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