The program uses a new data base technique to speed program execution. COMDEF, like most backcalculation algorithms, compares measured deflections with theoretical solutions. However, the COMDEF approach applies interpolating functions to a data base of precalculated solutions, so that the comparison basins are calculated quickly with reasonable accuracy. A description and flowchart of the method used by COMDEF is included. This paper discusses the role of nondestructive testing in pavement evaluation and the particular problems in evaluating composite pavements. Lack of knowledge about the degree of cracking in the rigid layer is a major problem, and backcalculated modulus is presented as a way to assess the degree of cracking in the rigid layer. The use of a representative basin is discussed, and data are presented which indicate that this approach should not be used for composite pavements. A sensitivity study is presented which includes solutions using COMDEF and a general purpose backcalculation program. COMDEF consistently outperformed the general purpose program in both speed and accuracy. Laboratory modulus tests were performed on samples taken from three verification sites. #Pavement backcalculation modulus verification# If you do not agree to the terms of this License Agreement, promptly exit this page This License Agreement, that you understand it and that you agree to be bound by its IMPORTANT-READ THESE TERMS CAREFULLY BEFORE DOWNLOADING THIS DOCUMENT.īy downloading the ASTM Document you are entering into a contract, and acknowledge that Agreement between laboratory modulus tests on field samples and backcalculated moduli from COMDEF was excellent. Please click here to view License Agreement for Educational Institutions. This document is copyrighted by the ASTM International (ASTM), 100īarr Harbor Drive, West Conshohocken, PA 19428-2959 USA.Īll rights reserved. You may not remove or obscure the copyright notice or other notices contained in the ASTMĪSTM grants you a limited, non-transferable license as follows: This is not a sale all right, title and interest in the ASTM Document (in both electronic file You (Licensee) have no ownership or other rights in the ASTM Document. The right to download an electronic file of this ASTM Document for temporary storage on oneĬomputer for purposes of viewing, and/or printing one copy of the ASTM document #Pavement backcalculation modulus license# #Pavement backcalculation modulus download# In addition, the electronic file may not be distributed elsewhere over computer networks or Neither the electronic file nor the single hard copy print may be reproduced in any way. That is, the electronic file cannot be e mailed, downloaded to disk, copied to another hardĭrive, or otherwise shared. #Pavement backcalculation modulus download#.#Pavement backcalculation modulus license#.#Pavement backcalculation modulus verification#.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |