Both UltraCrete QC10 and UltraCrete Post Fix are rapid strength concretes. UltraCrete QC10 has a much higher strength gain than UltraCrete Post Fix, so is more suitable for back-filling around ironwork as part of the BBA/HAPAS Approved Ironwork Reinstatement System. It is also effective when erecting heavyweight fencing and signs, whereby the post/sign can be erected in one application instead of waiting for the more conventional concrete to gain strength.