The creep test was conducted at University of News South (Australia) over
a period of time of 365 days as per AS1012.16 (1996). Four pieces of 100 mm
diameter by 200 mm high cylinders and were pre-loaded with compression stress of
64 MPa (i.e. 0.4fcm), in an environmental control room which has an
ambient temperature of 25°C and relative humidity of 50%. Two control specimens
were used as control specimens to measure the shrinkage strains of the
materials. The experimental creep strain data were converted into creep
coefficient (which defined as the ratio of the resultant creep strain over
instantaneous elastic strain), were presented in Figure 1.
Equation 1 is proposed to compare against the collected creep data and the equation shows this empirical equation fit well with the experimental data, where is the creep coefficient at any time t, and is the basic creep coefficient at 28 day. Based on the experimental finding, the characteristic creep coefficient at 28 days is taken as = 0.2
Creep and Shrinkage Behaviour (AS1012.16, 1996)
Equation 1
Figure 1: Proposed creep
equation 1 compare with experimental creep results on UHPdC.