CTRE is an Iowa State University center, administered by the Institute for Transportation.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

Website: www.ctre.iastate.edu/

Iowa State University--Becoming the Best

Hybrid Concrete for Advancing Pavement Performance


Principal investigators:

Project status

In progress

Start date: 03/01/17
End date: 02/28/18



About the research


The objective of this study is to explore the advantages, challenges, and feasibility of using a hybrid, semi-flexible, semi-ridge concrete for highway pavements, bridge decks, and overlays. This hybrid concrete will be made with asphalt pervious concrete filled with self-consolidating Portland cement mortar, and called a casting cement asphalt mixture (CCAM). The mixture is expected to possess the advantages of both asphalt (flexible) and Portland cement (rigid) concrete, such as no requirement for jointing, high resistance to rutting, high stability at elevated temperatures, and excellent mechanical and durability properties, thus advancing performance and longevity of transportation infrastructures.

In this study, experiments will be designed and conducted to achieve optimal CCAM mixes. The basic engineering properties, such as strength, shrinkage, and freeze-thaw durability, of the CCAMs, will be evaluated. The interactions of asphalt and Portland cement concrete will be examined, and their synergetic effects on pavement performance will be assessed.

It is expected that the results from the study will not only help determine if CCAMs are viable for transportation infrastructure but also provide fundamental insights and recommendations to lead to further evaluations of other key engineering properties and development of guidelines for applying CCAMs in practice.