Scientific Research An Academic Publisher. Haggam , Ismail M. Abd Elrhman , Sanaa A. ABSTRACT: Increasing traffic loading and volumes on roads have led to the use of polymer modified binders to improve the performance of bitumen in terms of strength, durability, and resistance to rutting. This research studies the effect of adding poly methyl methacrylate PMMA with different molecular weights on asphalt properties. The morphological studies of polymer modified binder were discussed.
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Samples of asphalt mixture were evaluated in the laboratory under various conditions to evaluate the repeatability of the resilient modulus test and the effect of stress on the measured resilient modulus.
Some samples were prepared in the laboratory, others were obtained from in-place pavements that had been subjected to traffic. The independent variables included stress, test temperature, and maximum aggregate size.
Tests were repeated a number of times, and the data were analyzed by Statistical Analysis System SAS to investigate their repeatability. This study quantified the repeatability of the ASTM D resilient modulus test as a function of stiffness. A significant increase in the number of samples or number of measurements is required to improve the repeatability. Tests conducted at different stresses showed the resilient modulus to be stress sensitive. This indicated that stress should be specified in the test procedure.
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Designation: D — 82 Reapproved Copyright ASTM. Standard Test Method for. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. The procedure described covers a range of temperatures, loads, loading frequencies, and load durations.
RESILIENT MODULUS TESTING OF ASPHALT SPECIMENS IN ACCORDANCE WITH ASTM D4123-82
This test method covers procedures for preparing and testing laboratory-fabricated or field-recovered cores of bituminous mixtures to determine resilient modulus values using the repeated-load indirect tension test. The procedure described covers a range of temperatures, loads, loading frequencies, and load durations. The recommended test series consists of testing at 41, 77 Note 1 , and F 5, 25 Note 1 , and 40C at one or more loading frequencies, for example, at 0. This recommended series will result in nine test values for one specimen which can be used to evaluate the overall resilient behavior of the mixture. Formerly under the jurisdiction of Committee D04 on Road and Paving Materials, this test method was withdrawn in December in accordance with section