Determine Maximum Aggregate Size and Water Requirements for Portland Cement Concrete

Maximum Size of Aggregates for Pavement Slab:

To determine the maximum size of aggregates used for Portland cement concrete for a pavement slab with a thickness of 9.5 inches, we need to refer to the project specifications provided by the relevant authority. The maximum size of aggregates is typically determined based on the thickness of the concrete element and the desired workability of the concrete mix.

Answer: The maximum size of aggregates used for the pavement slab with a thickness of 9.5 inches can vary depending on the specific project requirements. It is recommended to consult the project specifications or relevant standards to determine the appropriate maximum aggregate size for the concrete mix.

Water Requirements for Portland Cement Concrete:

To calculate the difference in the amounts of water needed to produce 1 yard^3 of non-air entrained and air entrained Portland cement concrete with a nominal maximum size of 1-inch coarse aggregate and a slump of 1-2 inches, we need to consider the air content and workability of the concrete mix. The amount of water required for air entrained concrete is typically higher than that for non-air entrained concrete.

Answer: The calculation for the difference in water requirements between non-air entrained and air entrained Portland cement concrete involves considering the factors such as air entrainment, slump, and aggregate size. It is recommended to refer to concrete mix design guidelines or consult with a concrete specialist for an accurate calculation.