Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements (2022) / Chapter Skim
Currently Skimming:
Pages 41-47
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 41... ...
41 This chapter presents examples of four state DOT approaches to managing or mitigating damage resulting from moisture-susceptibility of hot-mix asphalt in different regions in the United States. The selection of these DOTs was based on a variety of factors, such as diversity of climatic and topographic conditions within the state, heavy rainfall, lack of good quality aggregate, or the presence of aggregate resulting in mixtures prone to moisture damage, different/ unique approaches to damage mitigation, use of non-standard mix design methodology, or a combination of these factors.
|
From page 42... ...
42 Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements APL process for liquid anti-stripping agents to reduce the extent of mix design verification testing and to provide better flexibility with respect to using liquid anti-stripping additives. Under the revised program, liquid anti-stripping additives must be evaluated in eight standard mix types using the four predominant aggregate types.
|
From page 43... ...
Case Examples 43 to achieve density requirements. However, pavements containing limestone have traffic limitations imposed, because of their tendency to fracture under heavy traffic loads.
|
From page 44... ...
44 Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements for all open-graded mixes and SMAs. OGFC mixes are not tested using the HWTT, as they do not hold up well under the loading conditions (invariably, they will rut and thus yield unreliable data)
|
From page 45... ...
Case Examples 45 1.25% HL overall load. The virgin aggregate is kept about 2–3% above SSD condition before the addition of HL via a pug mill, and the aggregate-lime system is marinated for a minimum of 48 hours (but no longer than 6 weeks)
|
From page 46... ...
46 Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements meet the mix design HWTT requirement. Prior to the introduction of Superpave mix design methodology, the Washington State Department of Transportation (WSDOT)
|
From page 47... ...
Case Examples 47 Cracking Test may provide false positives and since it does not specify the loading duration for the test, the agency is looking for better ways to evaluate their high RAP and fatigue-susceptible mixes. They envision implementing the Cracking Tolerance Index into their specifications, based on the results of continued research.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.