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California On-Call Rigid Pavement Materials and Structural Concrete Services
Problem Statement and Objectives
ARA helped the California Department of Transportation (Caltrans) advance the performance and sustainability of its concrete materials. Working closely with the Caltrans Office of Rigid Pavement Materials and Structural Concrete (ORPMSC), ARA executed more than 40 task orders in key topic areas such as:
- Concrete and cement-related impacts on greenhouse gases
- Use of cement replacement and supplemental cementitious materials
- Materials-related technical support for the construction of the San Francisco Oakland Bay Bridge
- Pavement repairs (slab replacements, precast panels, dowel bar retrofits, under sealing)
- Pre-cast pavements
- Measuring dowel-bar alignment
- Maturity testing of PCC
- PCC durability
- Pavement surface characteristics
- 100-year pavement design
Results and Benefits
The collaborative efforts of Caltrans and the ARA team have greatly advanced the state of practice in California and provided significant improvements in the design, construction, maintenance, and rehabilitation of concrete pavements and structures. The result is better performing, more cost-effective, and more environmentally-friendly concrete pavements and structures throughout California.
One example of the benefits of ARA's work is its support of the San Francisco Oakland Bay Bridge construction. As part of this effort, ARA conducted a detailed analysis of the creep characteristics of the special concrete mixes used to construct elements of the bridge. As a result of ARA's innovation and detailed assessment of the situation, the post tensioning requirements on the bridge deck were greatly reduced, saving Caltrans and California taxpayers tens of millions of dollars in bridge construction costs and clearly demonstrating how good engineering saves money.
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