The Institute for Transportation at Iowa State University has released a report that examines the geological factors responsible for the results of the Iowa Pore Index (IPI) test used by several Midwestern state departments of transportation to rapidly and nondestructively determine the macropore-to-micropore ratio of coarse aggregate. The research may extend the IPI’s application to other stat...

The Ohio Department of Transportation (ODOT) has released a report that determines the effectiveness of multiple liquid deicers available on the market, including the time it takes the deicer to work as well as the how long the deicers will continue to work after applied to the roadways. The research provides a potentially cost-effective and environmentally friendly option instead of salt, the ...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2641 consists of 19 papers that explore pavements, including: Nondestructive In Situ Characterization of Elastic Moduli of Full-Depth Reclamation Base Mixtures Implementation of the Thin Bonded Concrete Overlay of Existing Asphalt Pavement Design Procedure in the AASHTOWare Pavement ME Design Software Evalua...

The Minnesota Department of Transportation (MnDOT) has released a report that summarizes non-chloride based deicers available on the market at this time, including acetate, formate, glycol, and succinate based deicing products. The report explores the deicers’ feasibility for use as alternatives to chloride based deicers, and identifies next steps to determine if a non-chloride based deicer is ...

The Maryland State Highway Administration has released a report that evaluates the compaction of unbound geomaterials under unsaturated conditions. To achieve this goal, this study examines different lightweight deflectometers (LWD) that are currently used throughout Maryland in order to find a possible replacement for the conventional methods with a practical modulus-based specification using ...

The Louisiana Department of Transportation and Development has released a report that investigates Styrene-Butadiene-Styrene polymer-modified asphalt binders currently used in Louisiana. This study conducts a suite of asphalt binder characterization tests to assess the suitability of MSCR tests to be included in Louisiana DOTD’s asphalt binder specifications. The report also identifies the pote...

Austroads has released a report that demonstrates the verification of the new Austroads sprayed seal design guidelines. This study inspected a series of double/double initial seals with a modified binder to investigate whether more robust, longer-lasting initial seals could be developed. The report is available for no fee after logging onto the site.

The U.S. Federal Highway Administration has released a report that describes the field testing of the bond between ultra-high performance concrete (UHPC) overlay and the substrate concrete bridge deck, particularly regarding delamination. As an overlay material, UHPC can provide both structural strengthening and protection from ingress of contaminates.

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Research Report 863: Material Properties of Cold In-Place Recycled and Full-Depth Reclamation Asphalt Concrete. Highway agencies are placing increasing emphasis on sustainability, recycling, and making maximum use of existing pavement assets in rehabilitation strategies. Such emphas...

The New Zealand Transport Agency has released a report that investigates the long-term acoustic performance of New Zealand standard porous asphalt manufactured in accordance with TNZ P/11 Specification for open graded porous asphalt (OGPA). OGPA is predominantly used in high-speed environments and is known to enhance skid resistance and reduce splash/spray during wet conditions. It is also know...