respectively. Flexural strength tests were conducted
on 40 mm 40 mm 160 mm UHPC matrix prisms and the compressive strength
tests were done on 50 mm cubes using a three-point bending testing machine
(DKZ-500) and a 200-ton compression testing machine (innovative instruments),
respectively. Two curing regimes were used in this research: standard curing condition
(20 ± 2 C and RH of 95%) and heat curing condition (placed into a lime bath
at 90 C). For standard curing, two curing ages (7 days and 28 days) were used; for
combined curing, the curing age was first 2 days heat curing and then 26 standard
days curing. Three replicate UHPC specimens were used for all the tests. Scanning
electron microscopy (SEM) with energy dispersive X-ray spectroscopy (FEI
Quanta 200 FEG) was used for microstructural evaluations.
3.