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Articles 1 - 5 of 5
Full-Text Articles in Engineering
Abrasion Resistance Of Ultra-High-Performance Concrete For Railway Sleepers, Ariful Hasnat, Nader Ghafoori
Abrasion Resistance Of Ultra-High-Performance Concrete For Railway Sleepers, Ariful Hasnat, Nader Ghafoori
Civil and Environmental Engineering and Construction Faculty Research
This study aimed to determine the abrasion resistance of ultra-high-performance concretes (UHPCs) for railway sleepers. Test samples were made with different cementitious material combinations and varying steel fiber contents and shapes, using conventional fine aggregate. A total of 25 UHPCs and two high-strength concretes (HSCs) were selected to evaluate their depth of wear and bulk properties. The results of the coefficient of variation (CV), relative gain in abrasion, and abrasion index of the studied UHPCs were also obtained and discussed. Furthermore, a comparison was made on the resistance to wear of the selected UHPCs with those of the HSCs typically …
Laboratory Evaluation Of Geogrid-Reinforced Flexible Pavements, Mohammad Reza Sharbaf, Nader Ghafoori
Laboratory Evaluation Of Geogrid-Reinforced Flexible Pavements, Mohammad Reza Sharbaf, Nader Ghafoori
Civil and Environmental Engineering and Construction Faculty Research
This study assessed the effectiveness of flexible pavements reinforced with two types of punched and drawn geogrids to reduce roadway base course thickness. Six laboratory tests were conducted using a steel cylindrical mold. Instrumentation included pressure cells placed at various locations of the test sections and a linear variable differential transformer which was placed on top of the loading system. A hydraulic actuator provided 40 kN (9 kips) cyclic load through a 305 mm (12 in) circular steel plate at a frequency of 0.77 Hz. Test results revealed that inclusion of both geogrid types in flexible pavement showed reductions in …
A Review Of Different Aspects Of Applying Asphalt And Bituminous Mixes Under A Railway Track, Kazem Jadidi, Morteza Esmaeili, Mehdi Kalantari, Mehdi Khalili
A Review Of Different Aspects Of Applying Asphalt And Bituminous Mixes Under A Railway Track, Kazem Jadidi, Morteza Esmaeili, Mehdi Kalantari, Mehdi Khalili
Civil and Environmental Engineering and Construction Faculty Research
Asphalt is a common material that is used extensively for roadways. Furthermore, bituminous mixes have been used in railways, both as asphalt and as mortar. Different agencies and research institutes have investigated and suggested various applications. These studies indicate the benefits of bituminous material under railways, such as improving a substructure’s stiffness and bearing capacity; enhancing its dynamic characteristics and response, especially under high-speed train loads; waterproofing the subgrade; protecting the top layers against fine contamination. These potential applications can improve the overall track structure performance and lead to minimizing settlement under heavy loads. They can also guarantee an appropriate …
Exploratory Analysis Of Recent Trends In School Travel Mode Choices In The U.S., Abhay Lidbe, Xiaobing Li, Emmanuel Kofi Adanu, Shashi Nambisan, Steven Jones
Exploratory Analysis Of Recent Trends In School Travel Mode Choices In The U.S., Abhay Lidbe, Xiaobing Li, Emmanuel Kofi Adanu, Shashi Nambisan, Steven Jones
Civil and Environmental Engineering and Construction Faculty Research
The study explores the recent trends in school travel using the 2017 National Household Travel Survey data. The study also investigates the exogenous factors affecting the school travel mode choice using random parameters multinomial logit (RPMNL) model. The results indicate that urban school trips range between 3 and 5 miles, whereas, average rural trips are longer than 6 miles. School commute times are higher among lower-income households. Further, the share of school bus and auto has declined while that of walking and biking has increased in 2017. This change is significant among high school students. Like other studies, the findings …
Real-Time Pm10 Emission Rates From Paved Roads By Measurement Of Concentrations In The Vehicle's Wake Using On-Board Sensors Part 1. Scamper Method Characterization, Dennis R. Fitz, Kurt Bumiller, Charles Bufalino, David E. James
Real-Time Pm10 Emission Rates From Paved Roads By Measurement Of Concentrations In The Vehicle's Wake Using On-Board Sensors Part 1. Scamper Method Characterization, Dennis R. Fitz, Kurt Bumiller, Charles Bufalino, David E. James
Civil and Environmental Engineering and Construction Faculty Research
Based on emission factors derived from the AP-42 algorithm, particulate matter from paved roads has been estimated to be a major source of PM10 of geologic origin. This is an empirical formula based on upwind-downwind measurement of PM10 concentrations and is dependent solely on the silt loading of the pavement and the weight of vehicles. A number of upwind-downwind studies conducted in urban areas to validate this algorithm have been generally inconclusive because the PM10 concentration difference between upwind and downwind often is within the measurement uncertainty. In the approach presented here PM10 concentrations were measured directly behind a moving …