Geotechnical Aspects of Pavement Engineering by Nishantha Bandara Manjriker Gunaratne

Author:Nishantha Bandara,Manjriker Gunaratne
Language: eng
Format: epub
Publisher: Momentum Press

Figure 3.13. Field CBR setup (ELE International).

The testing frequency varies with the type of pavement, the objectives of testing (periodic routine measurements or testing for decision making regarding specific rehabilitation), uniformity of pavement structure, and the amount of funding available for the testing program. A typical test location spacing ranges from 100 to 500 ft. Generally, on flexible or continuously reinforced concrete pavements (CRCP), only the outer lane is tested unless specific areas are targeted during the deflection testing program. On jointed plain concrete pavements (JPCP) and jointed reinforced concrete pavements (JRCP), FWD testing is conducted at midslab, joints, and corners.

FWD data can be used to determine the uniformity of support of the pavement structure and to obtain elastic moduli of each pavement layer, including subgrade materials. The back calculation of pavement layers’ moduli values using FWD data can be achieved using iterative computer programs. Several public domain (?) and commercial computer programs are available with varying accuracy. Some of sample programs include Modulus, Evercalc, and Elmod.

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