Fastcrete Fast Set Concrete is ideal for concrete projects requiring fast setting times with low structural requirements such as letter box posts, small signs, low fence posts and temporary hold of posts before topping with General Purpose concrete. Fastcrete is uniformly blended proportions of stone, gravel, sand, Portland cement and other admixtures approved for use in concrete.
For ease of use it can be poured in a hole already filled with the required amount of water and the post. (Note: In sandy soils line the hole with plastic). No mixing is required. After 15 minutes the hole can be topped up with soil and after 1 hour the post can withstand wire straining or similar pressure. Available in 25kg bags. One bag will produce approximately 0.012 cubic metres and can be used if length of post below ground is 300mm and height above ground is 900mm. After 7 days the concrete will achieve a minimum strength of 10MPA and will be at 15MPA after 28 days.