the SR 24 and SR 80 test sites where construction drawings indicated

thicknesses of 17.0 in. and 36.0 in., respectively.

 The base course material consisted of limerock except for SR 12

which was constructed with a sand-clay mixture. The subbase material

was in most cases stabilized, either mechanically or chemically with

lime or cement. This layer is conventionally called "stabilized sub-

grade" by the FDOT. The underlying subgrade soils were generally sands

with clay/silt layers often encountered at depth, as indicated from the

penetration tests. The locations of the water table which were inferred

from the CPT holes are also listed in Table 5.1.

 Most of the pavement sections were uncracked or had limited (hair-

line) longitudinal and/or transverse cracking. However, the US 441 test

section did exhibit block cracking even though the pavement structure

was stiff. Also SR 80, a recently constructed highway was included in

the study for the following reason. Some segments were highly dis-

tressed due to construction problems which had resulted in potholes,

ponding of water and cracking of the asphalt concrete surface. There-

fore, two segments of this roadway were included in this study; Section

1 in which there was no visible surface distress, and Section 2 in which

cracks and potholes were present. Only Dynaflect test data was collec-

ted on SR 80.


 5.3 Description of Testing Procedures

5.3.1 General

 Figure 5.2 shows the array and layout of tests performed for most

of the test pavement sections. In general, the NDT tests were performed

at 25-ft. spacings, while the penetration tests were restricted to sites