SAKRETE PSI 6000 is a pre-blended, air-entrained, synthetic fibre-reinforced, high-strength concrete. It contains alkali-resistant synthetic fibres that help prevent cracking and eliminate the use of wire mesh in many situations considered non-critical. It also contains an air-entraining agent, which produces a concrete with superior resistance to freeze-thaw cycles and to de-icing salts. Use it for new concrete construction projects as well as for concrete strengthening and repair, where a thickness of 5 cm (2 in.) or more is required. Open to foot traffic after approximately 24 hours.