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Researcher

Any individual whose activities focus on paving-related research. This may include university professors as well as those working in research and development elsewhere, whether in the public or private sector.
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De-Bonding of HMA Pavements/Layer Bonding

Major Themes From Past Tack Coat Studies This section attempts to identify some of the emerging themes associated with tack coats based on a qualitative meta-analysis of past research. Ideas that are corroborated amongst multiple studies are briefly discussed under individual headings while ideas emerging from single studies that have yet to be corroborated by … Read more »

HVS Mark IV+

HVS

HVS stands for Heavy Vehicle Simulator. It’s a large piece of equipment that allows for repeated passage of a truck or aircraft wheel over a pavement, simulating the action of many of such wheels from heavy vehicles. It is used in research to test pavement structures and roadway elements and their response to traffic. For … Read more »

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HVSIA

HVSIA definition and history Although Accelerated Pavement Testing (APT) is generally recognized as one of the most effective methods of evaluating improvements in pavement design and performance, it is expensive relative to other, typical pavement research activities. As a result, collaboration between APT programs, as well as other research efforts, is often discussed as a … Read more »

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Geosynthetics

Geosynthetics in HMA Applications The primary purpose of incorporating geosynthetics in the pavement design process is to reduce reflective cracking in HMA overlays and to resist moisture intrusion into the underlying pavement structure. Geosynthetics can be part of an overall rehabilitation strategy that will as a minimum include the placement of a new wearing/surface course … Read more »

Figure 12. Drop hammer used for cracking and seating PCC.

Life Cycle Assessment of Portland Cement Concrete Interstate Highway Rehabilitation and Replacement

by Craig D. Weiland A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Civil Engineering, University of Washington, 2008 Abstract A Best Practices Guide to Concrete Highway Rehabilitation in Washington State, by Craig Weiland Life Cycle Assessment (LCA) is a tool that can be used to identify … Read more »

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Life Cycle Assessment of HMA and RAP

General I am interested in creating a comparative life cycle analysis of recycled vs. standard hot mix asphalt or HMA. In Washington State, up to 20% recycled HMA, called recycled asphalt pavement or RAP, is allowed in large-scale road construction such as state highways and interstate roadways. Researchers are looking onto using up to 100% … Read more »

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General Guidance

  This is an informational resource on hot mix asphalt (HMA). It contains a general overview of all HMA aspects. It is intended to assist those who work with HMA in any way including architects, engineers, contractors, students, and homeowners. Pavement Checklist Pavement Distress Top-Down Cracking References Suggested Reading Asphalt Institute. (2001[1]). HMA Construction. Manual … Read more »

Figure 5: Hamburg Wheel Tracking Device (HWTD) from (Stuart and Youtcheff, 2002).

Laboratory Wheel Tracking Devices

Overview Laboratory wheel-tracking devices (Figure 1) are used to run simulative tests that measure HMA qualities by rolling a small loaded wheel device repeatedly across a prepared HMA specimen. Performance of the test specimen is then correlated to actual in-service pavement performance. Laboratory wheel-tracking devices can be used to make rutting, fatigue, moisture susceptibility and … Read more »

Figure 1: Stacked sieves used for a gradation and size test.

Gradation Test

Overview The gradation and size test (Figure 1) is used to determine aggregate particle size distribution. Size distribution is perhaps the single most important aggregate quality associated with the control of HMA mixtures. Aggregate gradation and size affect HMA volumetric properties as well as mixture permeability and workability. In a gradation and size analysis, a … Read more »

Figure 1: Pouring the aggregate sample into the sieve stack.

Sieve

A sieve is a mechanical device used to separate samples of different sizes. Sieve sizes typically used for Superpave mix design are 1½ in, 1.0 in, ¾ in, ½ in, 3/8 in, No. 4, No. 8, No. 16, No. 30, No. 50, No. 100 and No. 200 (37.5, 25.0, 19.0, 12.5, 9.5, 4.75, 2.36, 1.18, … Read more »

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