Development and evaluation of the test method of water damage and the effectiveness of anti-strip agents

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Development and evaluation of the test method of water damage and the effectiveness of anti-strip agents

 

Author: Zheng, Yu
Title: Development and evaluation of the test method of water damage and the effectiveness of anti-strip agents
Degree: M.Sc.
Year: 2011
Subject: Pavements, Asphalt -- Additives -- Testing.
Pavements, Asphalt -- Moisture.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: 112 leaves : ill. (chiefly col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2462907
URI: http://theses.lib.polyu.edu.hk/handle/200/6404
Abstract: This dissertation, presents an approach to help understand moisture damage and to evaluate the effects of moisture damage agents. Moisture damage in hot mix asphalt (HMA) pavements has been extensively documented since the late 1970's. The current test method for detecting moisture susceptibility in HMA is American Association of State Highway and Transportation Officials (AASHTO) T283. Experiments were performed to investigate the impact on the moisture resistance of paving mixtures of the addition of lime and cement directly to the asphalt prior to mixture preparation. Moisture resistance was evaluated on mixtures prepared using normal asphalt and polymer asphalt by freeze-thaw cycling of the mixtures in water. Other parameters investigated in addition to lime and cement that might affect moisture damage is indirect tensile strength (ITS) and tensile strength ratio (TSR) to the asphalt mixture, Results of the experiments indicate that the lime and the cement, when added to the asphalt in preparation of the mixtures, dramatically improved mixture resistance to moisture damage for asphalt mixtures. The specimens comaining no additional anti-strip agents reduced moisture damage resistance. Through the experiment condition changed, the stability of the specimens with different material performed dissimilarly. Results from the present study support previous work indicating that anti-strip agents play an important role in determining the moisture sensitivity of pavement mixtures.

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