Figure 8. Location of FWD sensors across joints and corner of a PCC slab

FWD DATA ANALYSIS

Table 3. Types of FWD tests conducted

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a. Central Wisconsin Airport.

b. Outagamie County Airport.

Figure 7. Frost and thaw depths calculated from subsurface temperature measurements.

corner of the slab. The placement of the sensors across

the joints and corner is illustrated in Figure 8. The

FWD measurements were alternated between the two

Transverse Joint

airports. At CWA, FWD deflection measurements be-

gan on 18 March and continued to 24 April 1986 (Table

3a). At OCA, FWD testing started on 15 March and

continued to 26 April 1986 (Table 3b). The FWD de-

flection measurements taken at both airports are pre-

sented in Janoo and Berg (1966).

The pavement surface temperatures at the time of

FWD testing for both airports are presented in Table 4.

Surface temperatures were measured with a thermo-

couple attached to a wooden dowel. The thermocouple

was placed against the pavement by the FWD operator.

At the time of FWD testing, the pavement surface at

CWA was dry except on 18 March and 14 April. At

OCA, the pavement surface was dry except on 5 April.

Subsurface temperature measurements indicated that

Figure 8. Location of FWD sensors across joints and

the pavement structures at CWA were frozen at the be-

corner of a PCC slab.

ginning of FWD testing and completely thawed by the

Western Governors University

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