International Conference on Optimizing Paving Concrete Mixtures and Accelerated Concrete Pavement Construction and Rehabilitation
Atlanta, Georgia, USA
November 7–9, 2007
Federal Highway Administration
Foreword to the Proceedings
It is becoming an established practice in the United States to require that concrete pavements provide low-maintenance service lives of 40 or more years. Damage to concrete pavements over the service life is expected to be due to traffic and environmental loadings and not due to concrete materials failure. Therefore, concrete durability is an important attribute of paving concrete. For long-life concrete pavements, the engineering criteria for concrete that are most important are workability (matching the concrete to the paving and finishing operations), durability, and strength. Most production concrete paving on the primary roadway network is carried out using slipform pavers that necessitate the use of concrete that is workable, can be easily consolidated, will not segregate, and can be finished to achieve the desired geometric shape. The finished end product needs to be durable—no early-age distress or materials-related distress. Concrete mixture optimization involves the adaptation of available concrete-making resources to meet varying engineering criteria, construction operations requirements, and economic needs.
Another requirement that is defining how concrete pavements are constructed relates to the need to maintain an accelerated construction schedule for concrete pavement construction and rehabilitation. Construction traffic congestion and construction zone safety are key concerns of motorists and State highway agencies. A goal of all highway agencies is to “Get in, get out, and stay out” when dealing with major highway pavement construction and rehabilitation. However, many State highway agencies are finding that considerable resources are needed to lessen the negative effects resulting from construction within urban, high-volume traffic areas. To minimize the need for frequent pavement construction and rehabilitation activities, highway agencies consider the use of concrete pavement a cost-effective, long-term solution for these high-impact corridors. The use of concrete pavement under these conditions poses many challenges. These challenges can be addressed successfully through careful planning, using the right construction processes, optimizing construction zone traffic management, and implementing public awareness programs.
This 2 1/2-day International Conference on Optimizing Paving Concrete Mixtures and Accelerated Concrete Pavement Construction and Rehabilitation was organized as a part of technology transfer activities for the Concrete Pavement Technology Program that operates within the U.S. Federal Highway Administration. The conference objective was to provide an international forum to address various aspects of concrete mixture optimization and accelerated concrete pavement construction and rehabilitation that result in long-life concrete pavements.
The editor thanks the authors for supporting the objective of this conference by developing comprehensive papers related to the two conference themes. The papers included in the proceedings were peer-reviewed for technical content, and the editor also thanks the Conference Steering Committee members and the many reviewers who participated in the review process.
Shiraz Tayabji, Ph.D., P.E.
Chair, Conference Steering Committee