› › Methods To Predict And Control Moisture Damage In Asphalt Concrete


Moisture Damage in Asphalt Concrete

Author : Russell G. Hicks

Publisher : Transportation Research Board

Page : 104 pages

File Size : 25,41 MB

Release : 1991

Category : Technology & Engineering

ISBN : 9780309049245

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Book Description

This synthesis will be of interest to pavement designers, construction engineers, maintenance engineers, and others interested in avoiding or limiting moisture damage in asphalt concrete. Information is provided on physical and chemical explanations for moisture damage in asphalt concrete, along with a discussion of current practices and test methods for determining or reducing the susceptibility of various asphalt concrete components and mixtures to such damage. Moisture damage in asphalt concrete is a nationwide problem which often necessitates premature replacement of highway pavement surfaces. This report of the Transportation Research Board describes the underlying physical and chemical phenomena responsible for such damage. Current test methods used to determine the susceptibility of asphalt concretes, or their constituents, to moisture damage are described and evaluated. Additionally, current practices for minimizing the potential for moisture damage are examined.



Evaluation of Test Methods to Predict Moisture Damage in Asphalt Concrete

Author : Bradley J. Bruce

Publisher :

Page : 0 pages

File Size : 25,32 MB

Release : 1990

Category : Pavements, Asphalt

ISBN :

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Book Description

The actual moisture susceptibility of 10 bituminous mixtures placed in the field was compared to the moisture susceptibility that was predicted during the laboratory evaluation of the same mix design. Laboratory mixtures were evaluated using the modified Lottman procedure and the Root-Tunnicliff procedure, in addition to routine moisture susceptibility testing which includes immersion compression testing. After two years, cores were taken from the field projects. The condition of the cores and their present susceptibility to moisture damage were determined by performing modified Lottman and Root-Tunnicliff testing. A feature of the evaluation process was the use of the ACMODAS program to predict the remaining service life of the plant mix cores.





Transportation Research Record

Author :

Publisher :

Page : 924 pages

File Size : 35,37 MB

Release : 1995

Category : Air travel

ISBN :

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Book Description

"For more than 50 years, the Transportation Research Record has been internationally recognized as one of the preeminent peer-reviewed journals for transportation research papers from authors in the United States and from around the world. One of the most cited transportation journals, the TRR offers unparalleled depth and breadth in the coverage of transportation topics from both academic and practitioner perspectives. All modes of passenger and freight transportation are addressed in papers covering a wide array of disciplines, including policy, planning, administration, economics and financing, operations, construction, design, maintenance, safety, and more."--Publisher's website



Determine Parameters Causing Water Damage to Asphalt Concrete

Author : Badru M. Kiggundu

Publisher :

Page : 56 pages

File Size : 26,71 MB

Release : 1986

Category : Asphalt concrete

ISBN :

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Book Description

This report summarizes research involving the determination of parameters causing water damage to asphalt concrete. The study was a cooperative effort between the Federal Highway Administration (FHWA) and NMERI. Bituminous mixtures with a history of water susceptibility were fabricated by FHWA. Compacted mixtures were evaluated for moisture damage at FHWA, then shipped to NMERI for chemical analysis of the binders. Extracted binders were analyzed by a modified Clay-Gel procedure and infrared spectroscopy to determine whether differences between moisture conditioned and control asphalts could be measured. An Index of Relative Severity (water damage) has been defined from analysis of the data. Changes in certain asphalt chemical constituents may relate to retained strength for mixtures without antistripping additives. Potential moisture damage is predicted equally with a least two mechanical tests used for mixtures antistripping compounds. Keywords: Clay-Gel compositional analysis, asphaltenes, saturates, aromatics, polars, asphalt generic composition, asphalt functional group concentrations, ketones, sulfoxides, carboxylic acids, IR spectroscopy, Lottman procedure, Immersion-Compression, percent retained strength, antistripping additives or agents, moisture-damage severity, and degree of relative severity.







Predicting Moisture Induced Damage to Asphalt Concrete Design Mixes

Author : Bradley J. Bruce

Publisher :

Page : 104 pages

File Size : 26,64 MB

Release : 1978

Category :

ISBN :

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Book Description

Many asphalt, aggregate, mineral filler and chemical additive combinations were tested for the correlation of the 'E' Modulus Test with visual assessment of the condition of the asphalt aggregate specimen and the results of other tests methods including Marshall Method, Resilient Modulus, Immersion Compression and Maximum Tensile Stress. Specimens used in conventional tests were treated in the manner prescribed by the method. Specimens for 'E' Modulus, Resilient Modulus and Maximum Tensile Stress were tested both before and after subjecting them to severe artificial conditions that were conceived as comparable to several years of natural exposure to the elements. 'E' Modulus was judged to be too inconsistent with other variables to be used as an acceptable criteria. The data suggests that Maximum Tensile Stress and Resilient Modulus tests would be valid tools for the evaluation of asphalt aggregate susceptibility to moisture damage. Immersion Compression data could be interpreted to provide information about stripping resistance and could serve to aid in the fabrication of mixes with reduced moisture susceptibility. The Marshall Method Testing provided inconsistent indications of moisture susceptibility using either flow or stability values.