Technical information

3-5
should be noted that whenever wander was applied, the lateral carriage position was not
recorded. Hence, the exact location of the load relative to the embedded gauge array is
known only for the initial part of the experiment in which passes were applied without
wander.
3.2 COMPOSITION OF TEST SECTIONS
The pavement structures (and subgrade) of sections n1 and n2 in lanes 1 and 2
respectively (see Figure 3.1.1) are shown in Figure 3.2.1. As can be seen, similar to the
N1 and N2 NCAT sections both are comprised of 5 in. (127 mm) of hot mix asphalt
(HMA) overlaying 6 in. (152 mm) of crushed granite aggregate base course, placed on
top of an A-4(0) soil serving as subgrade. Materials used to construct the sections were
sampled at NCAT and hauled to Indiana for placement in the APT. The properties of
each of the pavement components are discussed in more detail in the following
subsections. Llenín and Pellinen (2004) and Llenín et al. (2006) provide details on the
overall project planning and pavement construction process (see also Appendix C).
Lower Subgrade: 90% compaction
Crushed granite material; Average dry unit
weight: 133.5 pcf = 97%
A-4(0) soil; Average dry unit weight:
111.5 pcf = Average compaction degree:
93%
5 in.
Upper Subgrade
6 in.
19 in.
HMA
Aggregate
Base
Mix 2: NMAS 19 mm; PG 76-22; AVC 9.1% Mix 4: NMAS 19 mm; PG 67-22; AVC 9.4%
Section n1 Section n2
Mix 3: NMAS 9.5 mm; PG 67-22; AVC 7.3%
Mix 4: NMAS 19 mm; PG 67-22; AVC 9.7%
Mix 1: NMAS 9.5 mm; PG 76-22; AVC 7.5%
Mix 2: NMAS 19 mm; PG 76-22; AVC 10.2%
Figure 3.2.1: Composition of APT test pavements n1 and n2.