THE CONCRETE BRIDGE MAGAZINE

SUMMER 2007

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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ASPIRE , Summer 2007 | 43 Highways for Life Pilot Program The purpose of this program is to advance longer-lasting highways using innovative technologies and practices to accomplish the fast construction of efficient and safe highways and bridges. This program includes demonstration construction projects, technology transfer, technology partnerships, information dissemination, and monitoring and evaluation. HPC, including self-consolidating concrete and ultra-high performance concrete, has a definite place in this program in support of faster construction and longer-lasting structures. For more details of this program, visit http://www. fhwa.dot.gov/hfl. The state-of-the-knowledge is such that we understand the factors that affect the durability of concrete, and we have the knowledge for preventive measures that must be taken to improve the durability of concrete for meeting the design life and serviceability requirements of a project. The key then is to integrate research, theory, and practice to assure quality workmanship in construction and defect-free bridges and tunnels that can withstand the test of time with minimal maintenance and low life- cycle costs. flood, scour, and vessel or vehicle collision. The AASHTO LRFD Specifications fulfills a vision to design and build durable bridges for load effects with a high and uniform level of reliability. The American Concrete Institute defines concrete durability as the ability of concrete to resist weathering action, chemical attack, abrasion, and other conditions of service. S p e c i f i c a l l y, c o n c r e t e m u s t b e d e s i g n e d , proportioned, mixed, transported, placed, and cured properly to assure its resistance to potential freeze-thaw damage, alkali-silica reactivity, sulfate attack, chloride penetration, corrosion of reinforcing steel, abrasion, and load effects. The development of high-performance concrete (HPC) is aimed at achieving durable concrete. The FHWA High-Performance Concrete Technology Delivery Team (TDT) has been created to work with the state DOTs in building more economical and durable bridges using high performance concrete. TDT members represent the FHWA, State DOTs, academia, and industry. The mission of the team is to improve the durability and cost-effectiveness of the nation's transportation infrastructure. The TDT transfers HPC technology to the states through workshops and showcases hosted by participating DOTs. The TDT maintains the "Community of Practice" website where users can post questions on HPC, participate in discussions, share documents, and review works in progress. The website address is http://knowledge.fhwa.dot.gov/cops/hpcx.nsf/ home. The TDT has developed and published the HPC Structural Designers' Guide, intended to be a one-stop shopping reference for all aspects on the implementation of HPC. It is posted on the above website. The Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) establishes several research, deployment, and education programs for improving the durability and understanding the long-term performance of concrete bridges. These programs are: The Long-Term Bridge Performance (LTBP) Program This 20-year program involves detailed inspection and evaluation of the performance of a large section of the nation's bridges to (1) build a quantitative performance bridge database, (2) improve knowledge of bridge performance under all physical, chemical, and environmental conditions, (3) understand the deterioration mechanisms that affect durability of bridges, (4) improve inspection and condition information through nondestructive evaluation, and (5) develop emergency response, strengthening, repair, and retrofit procedures for rapid deployment following extreme events caused by natural and man-made hazards. This program is conducted by the FHWA in partnership with the states, consultants, industry, and academia. For more details of this program, visit http://www. tfhrc.gov/structur/ltbp.htm. The Innovative Bridge Research and Deployment (IBRD) Program This is a 4-year program for promoting, demonstrating, evaluating, and documenting the application of innovative designs, materials, and construction methods in the construction, repair, and rehabilitation of bridges and other highway structures. One component of the program is dedicated to research, deployment, and education of technology related to high performance concrete bridges. FHWA has developed the HPC plan in response to the needs identified by members of AASHTO, TRB committees, NCHRP, industry, academia, and others. Details of the HPC program are posted on the FHWA website. A major part of the IBRD program is to provide funds to the state and local highway agencies for incorporating innovations into construction projects for improved safety, reduced congestion, and greater durability. Annual solicitation of applications is issued for proposed projects that meet the goals of the program. FHWA will make its funding determinations through a merit- based selection process. For more details of this program, visit http://www.fhwa.dot.gov/bridge. U.S. Department of Transportation Federal Highway Administration Ultra-high performance concrete, as used in this test bridge for FHWA, is a new material for bridge construction. Photo courtesy of Ben Graybeal, FHWA. Flexural test of ultra-high performance concrete beam. Photo courtesy of Ben Graybeal, FHWA. ASPIRE_Summer_2007.indb 43 5/15/07 11:44:02 AM

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