The MODULUS system is described together with discussion on continuing efforts to validate the moduli values. Outputs include a summary listing showing the mean and variances of moduli values and also a graphical output that plots moduli values along a project and automatically performs subsectioning according to the recommended AASHTO procedure. ![]() The user has several options when performing backcalculations, including specifying the depth to bedrock or using existing default data bases for common pavement structures. The system is general purpose and can process data from any nondestructive testing device. ![]() Once generated, a pattern search routine is used to fit measured and calculated bowls error minimization is rapid, less than 5 sec per bowl on a 386 type microcomputer. It uses a linear elastic program to generate a data base of deflection bowls. MODULUS is a microcomputer-based backcalculation system that can be used on 2-, 3-, or 4-layer pavement systems with or without rigid bedrock layers. ![]() MODULUS: A MICROCOMPUTER-BASED BACKCALCULATION SYSTEM
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June 2023
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