Washington State University

Optimizing Asphalt Pavement Performance for Climate Zones Within Washington State


PI: Haifang Wen (WSU), haifang_wen@wsu.edu
Dates: 07/01/2013 – 8/31/2015

The pavements in the State of Washington witnessed great differences in performance, depending on the climatic zones. The climate west of the Cascade (referred to as West) is generally mild with wet winters. The climate in east of the Cascade (referred to as East) is drier with more extreme temperatures which often drop below freezing during winter. Studded tires are widely used in this area during winter time, creating additional damage (rutting and abrasion) to the hot mix asphalt (HMA) pavements. Read More

Laboratory Evaluation of Recycled Concrete as Aggregate in New Concrete Pavements


PI: Haifang Wen (WSU)
Dates: 03/01/2012 – 07/31/2014

The Washington State Department of Transportation (WSDOT) has initiated a research project to investigate the use of recycled concrete as aggregates (RCA) in Portland (hydraulic) cement concrete pavements (PCCP). The planned source for the RCA in the project will be from demolished pavements in western Washington, which generally contain very high quality aggregates. Aggregate quality varies across the state, and concrete made with RCA sourced elsewhere will likely have different properties.

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Media Filter Drain: Modified Design Evaluation


PIs: Cara PoorLiv Haselbach (WSU)
Dates: 03/01/2012 – 07/31/2014

The Washington State Department of Transportation (WSDOT) wishes to modify the media filter drain (MFD) design by changing the crushed gravel specification used in the mix. In order to gain approval from the Washington State Dept of Ecology (Ecology) and incorporate into their standard specifications, metal removal rates for the new design need to be compared to the old design based on accepted stormwater doses.

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