Email this article The Effect of Aggregate Gradation on Design Mix using Modified Bitumen
Abstract
Pavements undergo different type of stresses through out there life. Out of which rutting and fatigue are major distresses. To combat these problematic aspects of roads we have to deal from the root level of design mix (BC) and find a suitable cure for it.Aggregates are most important building component used in the construction as well as in the pavement industry. It is the reason for which aggregate characteristics and gradation greatly affect the performance of asphalt pavements and should be studied carefully. For preparation of mixes two types of gradation are considered i.e., Dense gradation and Open Gradation as per MORT&H (5th Revision) specifications. The mix with modified asphalt (CRMB 55) is evaluated under Marshall Test to obtain the optimum binder content and also the strength factor of the mix is evaluated by the test. After finding out the OBC, Indirect Tensile Strength test and Texas Boiling Test are carried out to investigate the preferability of the mixes. The research program also provides a comparative study on using neat binder and modified binder. The results brought a conclusion that open gradation super pasts dense gradation in every aspects and also gives a good result with CRMB as compared to neat bitumen.
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EISSN: 1943-5533
MORTH 4th Edition: VOL. 2: Road Specification
ASTM D 1559: Marshall Test Specification
http://www.pavementinterective.org/article/hma-performance- test/
http://www.pavementinterective.org/article/hma-types
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