Engineering Commons^™

Temperature Effect On The Mechanical Properties Of Steel Fiber Reinforced Ultra-High-Performance Concrete, Jenny Bernadette Gomes

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The contemporary innovation in concrete technology is ultra-high-performance concrete (UHPC). In this work, mechanical properties of UHPC are studied at ambient terrestrial temperature conditions. Specimens are prepared under laboratory environments maintaining the temperature of -25°C, -5°C, 15°C, 35°C, and 55°C. A freeze thaw chamber is utilized to condition the specimens at specified temperatures. Compressive strength, flexural strength, toughness, and modulus of elasticity are determined under varying temperature and steel fiber volume content. The results indicate that both temperature and steel fibers have effect on the mechanical properties of UHPC. The flexural and compressive strength show an opposite trend of strength …

Concrete Maturity Method Applied To Rapid-Setting Calcium-Sulfoaluminate (Csa) Concretes For Pavement Repair Under Different Ambient Temperatures, Ryan Nicholas Langford

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

With more and more people using roadways the need for fast and efficient repair work is becoming increasingly important. Lane closures impede traffic flow and result in congestion. To further limit the amount of time lane closures are needed for repair work, calcium sulfoaluminate (CSA) cement concrete has become an increasing popular construction material for its ability to reach adequate strength requirements within four hours. Because of this accelerated repair time, advanced testing methods are needed to verify that the replaced concrete does indeed meet or exceed the minimum compressive strength requirements.

The maturity method is one test used to …

Prestress Losses And Temperature Effects On A Deck Bulb Tee Girder Bridge, Phillip Powelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Utah Transportation Center (UTC), in partnership with the Mountain Plains Consortium (MPC), sponsored a study to investigate the differences in prestress losses and temperature gradients in a concrete deck bulb tee girder bridge. The Millville Bridge was built as an access point to the Ridgeline High School in Millville, Utah. The bridge was built in 2016 and presently supports two lanes of traffic.

Changes in prestress were measured with a total of 16 vibrating wire strain gauges located at four cross-sections. Temperature gradients were measured with a total of 50 thermocouples located at five cross-section locations, four of which …

Statistical Models Of I-15 Bridge C-846: Changes In Natural Frequencies Due To Temperature, Gilbert Nichols

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Structural Health monitoring is to determine the condition of a bridge based on instrument measurements. The C-846 Bridge in Salt Lake City has such instrumentation. The bridge is located in Salt Lake City at about 2100 South and Interstate 15. This bridge has two kinds of instruments on it: accelerometers and thermocouples. The accelerometers measure the vibrations of the bridge. The accelerometers have been recording data on the bridge since 2001. The thermocouples, which measure temperature, were added as part of this thesis in April 2016.

In light of recent research, damage may be detected from measuring the change in …

Uniform Temperature Predictions And Temperature Gradient Effects On I-Girder And Box Girder Concrete Bridges, Edyson Rojas

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Federal Highway Administration (FHWA) created the Long-Term Bridge Performance (LTBP) program with the objective of acquiring quality scientific data for in-service bridge performance throughout the United States. This information will be used to improve the practices of bridge design and maintenance. To accomplish this objective, a variety of sensors were installed on a bridge south of Sacramento, California and a bridge near Perry, Utah. Data from the sensors is constantly gather and analyzed.

This research analyzed the data from the temperature sensors in order to investigate the effect of temperature changes in the California and Utah bridges over a …

Statistical Models Of The Lambert Road Bridge: Changes In Natural Frequencies Due To Temperature, Nickolas Ryan Foust

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Structural health monitoring (SHM) systems have become tools for understanding how a civil structure truly behaves. In bridge structures, vibration-based SHM systems can be used to monitor the bridge’s modal parameters. Changes in modal parameters may indicate a change in the structure itself, boundary conditions, or damage. These modal parameters also vary with environmental factors, mainly temperature. Statistical models help show the correlation between modal parameters and temperature and can be used to filter out unimportant temperature effects. If done successfully, physical changes can be indicated and further inspection can be accomplished to minimize further damage.

The bridge structure utilized …

Temperature Effects On Integral Abutment Bridges For The Long-Term Bridge Performance Program, Leo E. Rodriguez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Long-Term Bridge Performance (LTBP) program was started by the Federal Highway Administration (FHWA) in 2009 to gather high-quality data on a collection of typical bridges over a twenty-year period of time. The goal of this program is to create databases of high quality data acquired through long-term instrumentation of the bridges behavior during their service life.

The data gathered will be used to improve design practices and effective management of infrastructures. As part of the LTBP Program two integral abutment bridges, a California Bridge near Sacramento, CA and a Utah Bridge near Perry, UT, were selected to be monitored …