5.3.5 Dilatometer Tests

 The dilatometer test was conducted according to the procedures

described by Marchetti and Crapps (69). The University of Florida cone

truck was also used to advance the dilatometer blade into the ground.

Two to three DMT tests were conducted at each pavement test section.

These were staggered between the CPT holes (Figure 5.2). Each test was

also restricted to a depth of about 18 ft.

 The DMT tests were conducted only in the subbase and underlying

subgrade soils. Because of the high stiffness of the overlying asphalt

concrete and base course layers, these materials had to be cored out

before conducting the DMT tests. The DMT data were reduced and inter-

preted with the computer program described by Marchetti and Crapps (69).

The results of the DMT data reduction for each test are listed in

Appendix D.

5.3.6 Plate Loading Tests

 The plate loading test was conducted on a limited number of test

 pavements as shown in Table 5.2. The testing procedure generally

 followed ASTM D 1195-64 (8) with slight modifications. The asphalt

 concrete layer was removed from approximately a 4-ft. wide strip across

 the traffic lane. In making the trench site, great care was taken to

 prevent disturbance of the material in the layer to be tested.

 The 12-in. plate was placed at a location within the test area.

 Molding plaster (hydrocal) was used to insure uniform loading on a level

 surface. The loading system was placed over the plate center. Two

 deflection gauges, one on each side of the 12-in. plate were then

 zeroed. The load increments depended upon the total load which was

 expected to cause an approximate 0.03-in. deflection. Five load levels