UFC 3-260-03
15 Apr 01
CHAPTER 9
COMPUTER PROGRAMS FOR PAVEMENT EVALUATION
1. DEVELOPMENT OF COMPUTER PROGRAMS. Computer programs have been developed to aid in
the evaluation of airfield pavements. One program titled Airfield Pavement Evaluation (APE) is for evalu-
ating pavements and calculating PCN using data from direct sampling. Another program, titled Layered
Elastic Evaluation Program (LEEP) is for evaluating pavements using data from nondestructive testing.
There is also a program titled ACN which is for calculating Aircraft Classification Numbers. All programs
have been run on IBM compatible microcomputers containing a minimum of 512K RAM. Installation of
the LEEP Program is discussed in appendix C.
2. PROGRAM NAME. The computer programs names consist of alpha numeric identifiers. The letters
APE for Airfield Pavement Evaluation, LEEP for Layer Elastic Evaluation Program, and ACN for Aircraft
Classification Number represent the program name. The number, e.g., 1.0 or 1.1, represents the version
number of the programs.
3. OBTAINING PROGRAMS. Current evaluation programs for rigid and flexible pavements may be
obtained electronically from the following:
FTP Anonymous Site: pavement.wes.army.mil
World Wide WEB (WWW): http://pavement.wes.army.mil/pcase.html
or disks may be obtained from the Transportation Systems Center,
12565 West Center Road, Omaha, NE 68144-3869.
4. USING PROGRAMS. In developing the computer programs, an effort was made to provide a user
friendly program requiring no external instructions for use of the programs. Aside from instructions for
initiating execution, which is standard for any executable program, the user is led through the design pro-
cedure by a series of questions and informational screens. The input data required for pavement evalu-
ation by the program is identical to the data required by evaluation criteria in this manual, and the results
obtained from the program should be close to the results obtained from the evaluation curves. Because
the computer program recalculates data and approximates certain empirical data, there may be some
minor differences in results from the program and from the manual. If significant differences are found,
contact the Transportation Systems Center.
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