Flexural Test on Un-notched Specimen (ASTM-C1018, 1987)
Figure 1: Frequency distribution of flexural strength by
four-point bending tests using un-notched specimens.
Figure 2: Experimental test setup.
For flexural tensile strength, there are many standard test
procedures are available in the literatures. Flexural toughness test as per ASTM-C1018 (1987) was selected to
determine the flexural properties of the UHPdC. Figure 1 and Figure 2 shows the
general experimental results and test setup of the un-notched specimens with 100
mm square cross-section and span over 300 mm. Prior-to the test, a pre-load of
10 kN was applied to the specimens and then unload to zero. This process was
used for 5 cycles and then the specimens were loaded with midspan displacement
control rate of 0.25 mm/min til the end of the test. The load will decrease
gradually after the peak load has achieved (i.e. ).
DU
series, AR series, and SL series summarized the some of the
typical experimental results. The characteristic value of flexural strength (
) obtained from the four-point bending tests for
specimen of 100 mm x 100 mm x 300 mm span is 22.6 MPa.
Figure 3: Experimental
flexural strength versus midspan displacement.
Figure 4: Multiple
cracks on prism specimen.