Curing

Since UHPC contains a small amount of mixed water, surface drying may affect its hardening properties, so it is important to cover the surface of the specimen with plastic sheets as quickly as possible after pouring to prevent moisture loss. Onsite or laboratory manufactured specimen should be cured according to the ASTM C31/C31M and ASTM C192/C192M, respectively.

If needed, the specimen can be heat treatment for 48 hours after demolding to achieve the desired strength at an early stage. The curing conditions are a temperature of 90 °C (195 °F), and relative humidity of 95%