Easy Mix Rapid Set Concrete is formulated to develop an initial set beginning at 15 minutes after placement. It contains a blend of Portland cement, gravels, sands and two accelerating compounds. There are two methods of using Rapid Set Concrete. The dry method which has a fast set time and the wet method which creates a stronger compressive strength. Dry Method | Containing a unique accelerator, the product can be placed around posts with water poured on top and no mixing is required. This allows for faster placement of posts. Wet Method | To achieve higher compressive strength, mix the concrete with water prior to placement. Coverage |1 bag (20kg) = 0.01 cubic metre. 100 bags (20kg) = 1.0 cubic metre. 1 x 20kg bag will fill: 400mm deep hole for a 100 x 100mm post or a 75 x 75mm post. 1.5 bags will fill: 600mm deep hole for a 100 x 100mm post or a 75 x 75mm post.