Journal Published Online: 18 January 2016
Volume 44, Issue 2

Effect of Testing Conditions on Laboratory Moisture Test for Asphalt Mixtures

CODEN: JTEVAB

Abstract

Moisture damage is one of the major causes of premature failure in asphalt pavements, and it also accelerates the severity of other distresses. To date, no moisture test has been widely accepted that is reliable and practical in predicting the field moisture performance of the asphalt mix during the design stage. One reason is because the sample conditioning methods cannot represent the field conditions, resulting in inconsistent results with the field performance of some mixtures. Taken into account this concern, this paper investigates how different testing conditions, including sample preparation, moisture saturation, and loading methods, can affect the results of laboratory moisture tests. In conclusion, it is found that the degree of vacuum pressure for achieving moisture saturation and air voids distribution has a significant impact on the moisture testing results. Multiple freeze–thaw cycles have a limited effect on the variation of mechanical performance (i.e., compressive dynamic modulus). If one or several freeze–thaw cycles are to be used in a moisture test, the effect of aging should be considered. It is recommended that a sample without coring and cutting should be used for a moisture test as the coring and cutting process is found to change the air voids distribution, i.e., the percent of connected air voids, thus making the sample not representative to the field condition. Finally, the moisture test results are more sensitive under tension mode than under compression mode.

Author Information

Yi, Junyan
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, CN
Shen, Shihui
College of Transportation, Tongji Univ., Shanghai, CN
Wang, Dongsheng
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, CN
Feng, Decheng
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, CN
Huang, Yudong
School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, CN
Pages: 12
Price: $25.00
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Details
Stock #: JTE20150128
ISSN: 0090-3973
DOI: 10.1520/JTE20150128