MATERIALS USED

The materials consisted of cement, coarse and fine aggregates and chemical admixtures. No filler or mineral admixtures were used. The cement was a Type I/II with a fineness of 345 m²/kg. No chemical analysis was conducted on the cement. The aggregates were crushed limestone. The maximum size for the coarse aggregates was 12.5 mm (1/2 in). Two types of chemical admixtures were used: a high range water reducer (HRWR) and viscosity modifying admixture (VMA). The HRWR was a carboxylated copolymer-based mixture. The VMA was a modified cellulose product.

Compositions of the concrete mixtures are shown in Table 1. The HRWR was adjusted to obtain a slump spread of at least 610 mm. The VMA dosage was set at three levels from 0 mL/kg to 859 mL/kg of cement to obtain a wide range of plastic viscosities as measured with the IBB rheometer. These compositions were selected from a previous larger set of experiments conducted with similar aggregates and cement [8].

In the column marked "U-flow" the concretes that are SCC, according to the criteria adopted, are shown in bold characters.
W/C: water-cementitious material ratio
S/A: sand to total aggregate ratio

Bold = SCC. YS = yield stress, Vis. = viscosity.