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Title: Compaction of asphalt mixtures for laboratory testing: evaluation based on density profile
Authors: Fwa, T.F. 
Low, B.H. 
Tan, S.A. 
Issue Date: Sep-1993
Citation: Fwa, T.F.,Low, B.H.,Tan, S.A. (1993-09). Compaction of asphalt mixtures for laboratory testing: evaluation based on density profile. Journal of Testing and Evaluation 21 (5) : 414-421. ScholarBank@NUS Repository.
Abstract: Cylindrical specimens are commonly used in laboratory testing of asphaltic paving mixtures. This paper describes a study that examined the influence of different compaction methods on the resulted density distributions of cylindrical specimens using a laboratory twin-probe nuclear density gage. Two common sizes of 102 mm (4 in.) cylindrical specimens, namely 64-mm (2.5-in.) high Marshall-size specimens, and 200-mm (7.87-in.) high triaxial test specimens, were considered in the test program. Four compaction methods were studied: drop-hammer compaction, kneading compaction, single-plunger compression, and double-plunger compression. In the case of 200-mm-tall specimens, the effect of compaction in layers was also examined. Test results show that, except for the kneading compaction method, the other three methods could all produce 64-mm-tall Marshall-size specimens of relatively uniform density distributions with density variation within 0.05 g/cm3. For 200-mm-tall specimens, only the double-plunger compression method was able to produce specimens with density distribution of similar uniformity.
Source Title: Journal of Testing and Evaluation
ISSN: 00903973
Appears in Collections:Staff Publications

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