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Bridges represent a substantial investment of public funds, and are expected
to provide satisfactory performance and remain in service for many years. Design
specifications typically require 75- or 00-year design life for new bridges.
Neglecting or delaying bridge maintenance can result in reduced service life and
increased costs due to repair, rehabilitation, or replacement at an early age.
Another consequence of neglecting maintenance is that the condition of the
bridge can become life-threatening to the public. It is believed that continuous
and systematic maintenance of a bridge will extend its service life and reduce
its overall operating cost.
This document addresses typical problems and presents potentially
cost-effective maintenance techniques for concrete bridge elements. It provides
guidance for engineers and maintenance staff. It does not cover repair, rehabilitation,
reconstruction, or bridge inspection, and therefore, it does not include topics
such as cathodic protection, repair with shotcrete, and deck overlays. Detailed
methods of repairing and inspecting bridges may be found in the references.
Concrete bridge maintenance is defined as those activities that are
relatively inexpensive and repeatable, performed when the concrete element is
still in good to fair condition, intended to prevent or minimize deterioration
of the concrete. These activities may include sealing, washing, caulking, crack
repair, and other minor repairs intended to prolong the functionality of the
bridge element. 20 pp.
ACI 345.R-06 Guide for Maintenance of Concrete Bridge Members - Table of Contents:
Bridge maintenance
Introduction
Concrete bridge maintenance
Purpose of maintenance
Limitations
Timing of maintenance
Concrete bridge deterioration,
Deterioration indicators
Causes
Contributing factors
Considerations in bridge design
General
Decks and curbs
Deck joints
Superstructure
Substructures
Drainage and washing
General
Deck drainage
Washing exposed surfaces
Maintenance of deck drains
Other drain considerations
Sealing
General
Purpose
Sealing materials
What and when to seal
Recommended practice
Product selection
Maintenance patching
General
Purpose
Selecting durable patching materials
Recommended patching procedures
Joints, cracks, and control joints
General
Maintenance of joints
Cracks
Crack repair
Joint caulking
Potentially promising techniques for bridge maintenance
General
Corrosion inhibitors for use in maintenance
Galvanic cathodic protection using sprayed zinc
References
Referenced standards and reports
Cited references
ACI 345.1R-06 Guide for Maintenance of Concrete Bridge Members
ACI 345.1R-06 Guide for Maintenance of Concrete Bridge Members
