The Performance Improvement of Hot Mix Asphalt and
Enhanced Applicability to Pavement Structure Thickness Design Using
DAMA (Drain Asphalt Modified Additive)
Jung-hoon, Jin* * University of Incheon ITS. R.C.
Researcher
3. Laboratory Test Methods and
Results
3.3 Indirect tensile
strength test Indirect tensile strength test (KS F 2376) simulates the
tension status at the lower asphalt concrete layer often exerted by traffic
loads and large temperature change at the surface layer. It is used to evaluate
the resistibility to fatigue cracking and cracking at low temperature. The
indirect tensile test is performed by exerting a compression force in parallel
to a vertical side on a cylindrical experimental specimen. In order to
distribute the tensile force evenly, a concave metal loading apparatus with
12.7mm width and 101.6mm diameter is used to simulate the diameter and curvature
of the Marshall experimental apparatus. The 5-ton capacity loading is then
exerted at 50mm/minute speed and 25℃ temperature. Figure 11 shows the loading
process and the point of destruction. Figure 12 depicts the experimental
process. The result of this indirect tensile strength test is shown in table 9
and figure 13. Figure 14 shows the change in the indirect tensile strength with
respect to the amount of DAMA in the experimental asphalt mixture specimen.
