This paper is aimed at presenting the test results of some mechanical properties of UHPC (Ultra high performance concrete) and UHPFRC (Ultra high performance fiber reinforced concrete) with employing aggregates in Vietnam. The tests to determine compressive strength, elastic modulus and splitting strength were conducted using the cylinders of 100 x 200 mm, while three-point flexural tests to determine flexural strength were conducted using the prisms of 150 x 150 x 700 mm. The test results indicated that higher volume of steel fibers lead to a significant increase in mechanical strengths, however there is no effect in elastic modulus. The addition of steel fibers mitigates the brittle failure and increases the ability of ductile failure. The steel fiber volume of 2% gave the most significant increase in the strength and ductile failure. Furthermore, the comparison between the mechanical properties obtained from the current test and those obtained from the previous tests and international guidelines was conducted to evaluate the reliability of the test results.