Lundi, 25 Mars, 2024 - 13:30
Bridge decks are prone to various types of cracking due to a combination of factors, including traffic loads, temperature variations, moisture, and chemical exposure. This report tackles the critical issue of bridge deck cracking by systematically dissecting the problem, exploring various crack types, and emphasizing the crucial inspection and categorization of...
Lundi, 18 Mars, 2024 - 17:45
Polymer overlays consist of polymer resins and aggregates and are used on bridge decks to extend service life by providing waterproofing and chloride penetration resistance and restoring surface friction. High friction surface treatments (HFSTs) are a specific type of polymer overlay intended to provide long-term skid resistance by using aggregates with...
Lundi, 18 Mars, 2024 - 17:30
The existing foundations of a bridge can sometimes be reused. This may occur when a completely new bridge is built but also in bridge or superstructure widening projects. Reuse of existing foundations not only eliminates the costs associated with demolishing and disposing of old foundations, but also reduces the costs of the design and construction of new...
Lundi, 8 Janvier, 2024 - 15:30
There are over 590,000 bridges dispersed across the roadway network that stretches across the United States alone. Each bridge with a length of 20 feet or greater must be inspected at least once every 24 months, according to the Federal Highway Act (FHWA) of 1968. This research developed an artificial intelligence (AI)-based framework for bridge and road...
Lundi, 21 Août, 2023 - 15:15
The objective of this project was to demonstrate and evaluate a highly efficient and economical method for evaluation of the condition of bridge decks in Alaska. The method, Aerial Infrared Thermography (Aerial IR), implements traditional infrared thermography from a fixed-wing aircraft using high resolution infrared and visual cameras. To address the objective...
Lundi, 30 Janvier, 2023 - 15:45
The existing Machine Learning (ML) models for vibration-based damage assessments often use highly compressed features or are restricted to preprocessed signals with fixed durations and sampling rates. Additionally, the learning capacities of ML models and computational resources are limited, which restricts using raw signals as direct input. This report studies...
Lundi, 23 Janvier, 2023 - 18:30
This project developed a novel type of steel fiber to reinforce ultrahigh performance concrete (UHPC) and demonstrated its use in a recently built bridge. The new fiber has micrometer-scale striations on its surface to ensure highly effective anchorage into the UHPC matrix. The initial research effort focused on identifying the optimal striation configuration...
Lundi, 8 Août, 2022 - 17:45
The use of precast pretensioned girders using 0.7-in. diameter strands would help bridge designers extend the spans of the existing girder shapes.
The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 315: Details of the Study on the Use of 0.7-in Diameter Strands in Precast Pretensioned Girders is supplemental to NCHRP...
Lundi, 8 Août, 2022 - 17:45
Long-span bridges are often used in environmentally sensitive terrains, water crossings, and in locations with traffic and geometric restrictions.
The TRB National Cooperative Highway Research Program's NCHRP Research Report 994: Use of 0.7-in. Diameter Strands in Precast Pretensioned Girders presents the design methodology for precast pretensioned...
Mercredi, 3 Août, 2022 - 14:15
Integral abutment bridges have become popular worldwide by eliminating movable shoes which are expensive to purchase, install, and maintain in conventional bridges. However, the behavior of bridge abutments subjected to air temperature changes for integral bridges is different from that of conventional bridges. Expansion and contraction of bridge girders due to...
Mardi, 14 Juin, 2022 - 20:30
Without adequate drainage, stormwater can accumulate on road surfaces creating safety hazards including vehicle hydroplaning, road spray, and obscured roadway markings. Therefore, it is essential for designers to have tools that accurately represent water accumulation, movement, and capture within the roadway environment so that criteria for allowable spread...
Lundi, 6 Juin, 2022 - 15:15
The use of roundabouts in rural areas of the US is growing rapidly. For roundabouts constructed with concrete pavement, joint layout can be especially challenging. To reduce the need for sophisticated joint layouts, consideration is being given to constructing roundabouts without joints and instead using structural fiber reinforced concrete (FRC) to bridge any...
