The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Satya Pinapaka - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of Innovative Safety Treatments. Volume 3: A Study of the Effectiveness of Tyregrip High Friction Surface Treatment
2020Co-Authors: Vivek Reddy, Tapan K Datta, Peter T. Savolainen, Satya PinapakaAbstract:The Florida Department of Transportation (FDOT) District 4 Traffic Operations office in consultation with the Federal Highway Administration (FHWA) has installed the Tyregrip high friction surfacing system to help reduce the potential for run-off-road crashes along the on-ramp to northbound I-75 from eastbound Royal Palm Boulevard located in the City of Weston, Broward County, Florida. The Tyregrip system was installed on a 300-foot section of the ramp, just upstream of the gore area between I-75 and the ramp, where the majority of the crashes occurred. This particular ramp was chosen as a candidate for this field test based on its crash history with 12 run-off-road crashes in the three-year period from 2002 to 2004. Eighty-three percent of these crashes occurred under wet road Surface conditions. The effectiveness of the Tyregrip Surface was evaluated from a materials perspective and from a safety perspective by using various types of data as discussed below. Crash data were obtained from the Florida Department of Transportation Crash Analysis Reporting System (CARS). Over the four-year period prior to the installation of the Tyregrip, the treated section experienced an average of 2.54 crashes per year. In the 12 month period immediately following the installation of Tyregrip Surface, the section experienced two crashes. Since the Tyregrip was installed in May 2006, sufficient crash data was not available to determine a statistically significant difference in crash frequency or rate. Due to the crash data limitations, surrogate measures of safety were evaluated to obtain a better understanding of the effects of the Tyregrip treatment as discussed below. Skid tests were performed by the FDOT Materials Testing office for the study section of the ramp before and after the treatment on April 11, 2006 and May 23, 2006, respectively. The results of these tests indicate that the friction number was much higher after application of the Tyregrip treatment, as expected. Speed studies were performed within the treated section before and after the installation of the Tyregrip at different times of the day. The results of these studies indicate that the mean speeds were decreased by an average of 3.72 miles per hour under dry pavement conditions. Under wet conditions, the mean speeds also decreased, by an average of 2.62 miles per hour after the application of the Tyregrip treatment. The proportion of vehicles encroaching either the outer or inner shoulders was examined prior to and after the application of the Tyregrip using the Z-test. The results indicate that the proportion of drivers encroaching the shoulder decreased significantly after the installation of the Tyregrip under wet pavement conditions while no significant difference was found under dry conditions. Overall, the Tyregrip treatment was effective in increasing the friction between the roadway and vehicle tires. The treatment was found to assist motorists in maintaining their lane position under wet pavement conditions. In addition, drivers tended to slow down when traveling over the treated section of the ramp. It appears that the use of Tyregrip may be a practical countermeasure for improving safety at locations that are prone to run-off-road crashes, particularly sharp curves and entry/exit ramps.
-
A Study of the Effectiveness of Tyregrip High Friction Surface Treatment
2009Co-Authors: Vivek Reddy, Tapan K Datta, Peter T. Savolainen, Satya PinapakaAbstract:This article reports on a study of the effectiveness of high friction Surface treatment (tradename Tyregrip) to reduce the potential for runoff-road crashes. The Florida Department of Transportation (FDOT) and the Federal Highway Administration (FHWA) installed the Tyregrip high friction surfacing systems along a 300-foot section of the on-ramp to northbound I-75 from eastbound Royal Palm Boulevard in the city of Weston (Broward County), Florida. The Tyregrip surfacing system consists of a highly-modified exothermic epoxy resin two-part binder usually top dressed with a calcined bauxite with a polished stone value (PSV) of 70%. This system has long-lasting durability and skid resistance properties on both wet and dry pavement conditions. The authors discuss measurements of crash frequency, vehicle speeds, shoulder encroachments, data on the friction factor, tests for variability, and tests for differences in the mean speeds. Travel speeds were found to decrease after the application of the Tyregrip (an average of 3.72 mph under dry pavement conditions and 2.62 mph under wet pavement conditions). The proportion of vehicles encroaching onto the shoulder was found to decrease substantially under wet pavement conditions after the installation of the Typegrip treatment. The authors conclude that the use of Tyregrip may be a practical countermeasure for improving safety at locations that are prone to run-off-road crashes, particularly sharp curves and entry/exit ramps.
Jim Weston - One of the best experts on this subject based on the ideXlab platform.
-
Kwik Bond Polymers® High Friction Surface Treatment
2015Co-Authors: Keith W Anderson, Mark Russell, Jeff S Uhlmeyer, Jim WestonAbstract:High friction Surface treatment (HFST) was applied to two on-ramps in the Seattle urban area to improve friction resistance. The ramps were high accident locations. The system applied was polyester resin binder and calcined bauxite aggregate. Testing of the completed HFST resulted in average friction numbers (FN40R) ranging from 75 to 86 with no individual value below 72. An evaluation period of five years is planned to monitor the performance of the HFST. At the end of the five-year period, a final report will be written which summarizes the friction and performance characteristics of the application, its effectiveness at reducing collisions, its cost effectiveness and recommendations on the future use of the high friction Surface treatments.
-
Evaluation of Tyregrip® High-Friction Surfacing
2012Co-Authors: Keith W Anderson, Mark Russell, Jeff S Uhlmeyer, Justin Sheets, David Burkey, Jim WestonAbstract:This report describes the installation of Tyregrip®, a high friction Surface, on a high accident location to reduce accident rates. Tyregrip® is a thin polymer overlay system that uses a two part epoxy binder and calcined bauxite aggregate. Post-construction friction resistance results in the middle to high 70’s indicate that the Tyregrip® has improved the friction properties of the collision prone ramp. The installation will be monitored for friction resistance and accident reduction for a minimum of five years.
Imad L. Al-qadi - One of the best experts on this subject based on the ideXlab platform.
-
Development of an Economical, Thin, Quiet, Long-Lasting, High Friction Surface Layer, Volume 1: Mix Design and Lab Performance Testing
Civil Engineering Studies Illinois Center for Transportation Series, 2013Co-Authors: Imad L. Al-qadi, Samuel H CarpenterAbstract:This project developed and evaluated four new asphalt concrete (AC) mixtures that use locally available aggregates whenever possible with the ultimate goal of a cost-effective mixture that also improves pavement performance. Although numerous tactics have previously been introduced to improve the performance of asphalt pavement, these improvements often add expenses because they use unnecessarily large amounts of high quality aggregates and highly modified binder. The Illinois Department of Transportation initiated a program to develop sustainable asphalt pavements that use locally available aggregates as much as possible to reduce the material cost while also improving performance. These new mixtures were developed using the Bailey method to provide a promising aggregate structure that makes it possible to ensure compactability at thinner layers. The newly developed mixes use locally available natural aggregates such as dolomite, and include smaller amounts of imported materials such as quartzite, steel slag, and fibers to improve their performance in terms of durability, rut resistance, moisture susceptibility, fracture, and complex modulus. To evaluate the performance of each new mixture, five laboratory tests were conducted at the Advanced Transportation and Research Engineering Laboratory (ATREL), and the results suggest a preferred mixture.
-
Development of an Economical Thin, Quiet, Long-Lasting, High Friction Surface Layer for Economical Use in Illinois, Volume 2: Field Construction, Field Testing, and Engineering Benefit Analysis
Civil Engineering Studies Illinois Center for Transportation Series, 2013Co-Authors: Imad L. Al-qadi, Thomas G ZehrAbstract:This project provides techniques to improve hot-mix asphalt (HMA) overlays specifically through the use of special additives and innovative surfacing technologies with aggregates that are locally available in Illinois. The ultimate goal is to improve pavement performance through optimized materials while also controlling cost by efficiently using local materials. Therefore, the proposed new mixes use locally available aggregates when possible. The project also considered the use of alternative aggregates such as steel slag to increase the friction quality of the HMA and therefore improve pavement performance. To evaluate the newly developed wearing course mixtures and evaluate their performance under actual traffic loading, test pavements were constructed, including control mixtures, between August and November 2010 in northern Illinois. The newly proposed mixtures include fine dense-graded HMA and stone matrix asphalt (SMA). The fine dense-graded HMA was designed using the Bailey method and developed with the hope of improved compactability for thinner asphalt layers. The SMA contained a 4.75-mm nominal maximum aggregate size (NMAS) that allows for layers as thin as 0.75 in. On-site performance tests were conducted at 4-month intervals following construction; the tests include noise, friction, rutting, and texture profiling. An engineering benefit analysis was performed to evaluate the new mixes’ cost effectiveness. New HMAs are proposed, along with alternative cross-sections that improve pavement performance while controlling costs.
Vivek Reddy - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of a High Friction Pavement Surface Treatment
2020Co-Authors: Peter T. Savolainen, Vivek Reddy, Joseph B Santos, Tapan K DattaAbstract:The Florida Department of Transportation (FDOT) installed a high friction pavement Surface system aimed at reducing the potential for run-off-road crashes along an on-ramp to northbound Interstate 75 from eastbound Royal Palm Boulevard in the City of Weston, Florida. The effectiveness of the Tyregrip Surface was evaluated from a materials perspective and from a safety perspective. Due to the limited availability of crash data for the site, surrogate measures of safety were evaluated to obtain a better understanding of the effects of the Surface treatment. Skid tests performed by the FDOT Materials Testing Office indicated that the friction number was much higher after application of the treatment, as expected. Speed studies revealed that the mean speeds were decreased by an average of 3.72 miles per hour under dry pavement conditions and 2.62 miles per hour under wet pavement conditions after treatment application. The speed variance and proportion of drivers exceeding the posted advisory speed were also found to decrease under both wet and dry pavement conditions with the Surface treatment. Drivers were also less likely to encroach over the pavement edge lines under wet pavement conditions after the treatment was applied. It appears from this study that the use of this high friction Surface treatment may be a practical countermeasure for improving safety at locations that are prone to run-off-road crashes, such as sharp curves and interchange ramps.
-
Evaluation of Innovative Safety Treatments. Volume 3: A Study of the Effectiveness of Tyregrip High Friction Surface Treatment
2020Co-Authors: Vivek Reddy, Tapan K Datta, Peter T. Savolainen, Satya PinapakaAbstract:The Florida Department of Transportation (FDOT) District 4 Traffic Operations office in consultation with the Federal Highway Administration (FHWA) has installed the Tyregrip high friction surfacing system to help reduce the potential for run-off-road crashes along the on-ramp to northbound I-75 from eastbound Royal Palm Boulevard located in the City of Weston, Broward County, Florida. The Tyregrip system was installed on a 300-foot section of the ramp, just upstream of the gore area between I-75 and the ramp, where the majority of the crashes occurred. This particular ramp was chosen as a candidate for this field test based on its crash history with 12 run-off-road crashes in the three-year period from 2002 to 2004. Eighty-three percent of these crashes occurred under wet road Surface conditions. The effectiveness of the Tyregrip Surface was evaluated from a materials perspective and from a safety perspective by using various types of data as discussed below. Crash data were obtained from the Florida Department of Transportation Crash Analysis Reporting System (CARS). Over the four-year period prior to the installation of the Tyregrip, the treated section experienced an average of 2.54 crashes per year. In the 12 month period immediately following the installation of Tyregrip Surface, the section experienced two crashes. Since the Tyregrip was installed in May 2006, sufficient crash data was not available to determine a statistically significant difference in crash frequency or rate. Due to the crash data limitations, surrogate measures of safety were evaluated to obtain a better understanding of the effects of the Tyregrip treatment as discussed below. Skid tests were performed by the FDOT Materials Testing office for the study section of the ramp before and after the treatment on April 11, 2006 and May 23, 2006, respectively. The results of these tests indicate that the friction number was much higher after application of the Tyregrip treatment, as expected. Speed studies were performed within the treated section before and after the installation of the Tyregrip at different times of the day. The results of these studies indicate that the mean speeds were decreased by an average of 3.72 miles per hour under dry pavement conditions. Under wet conditions, the mean speeds also decreased, by an average of 2.62 miles per hour after the application of the Tyregrip treatment. The proportion of vehicles encroaching either the outer or inner shoulders was examined prior to and after the application of the Tyregrip using the Z-test. The results indicate that the proportion of drivers encroaching the shoulder decreased significantly after the installation of the Tyregrip under wet pavement conditions while no significant difference was found under dry conditions. Overall, the Tyregrip treatment was effective in increasing the friction between the roadway and vehicle tires. The treatment was found to assist motorists in maintaining their lane position under wet pavement conditions. In addition, drivers tended to slow down when traveling over the treated section of the ramp. It appears that the use of Tyregrip may be a practical countermeasure for improving safety at locations that are prone to run-off-road crashes, particularly sharp curves and entry/exit ramps.
-
A Study of the Effectiveness of Tyregrip High Friction Surface Treatment
2009Co-Authors: Vivek Reddy, Tapan K Datta, Peter T. Savolainen, Satya PinapakaAbstract:This article reports on a study of the effectiveness of high friction Surface treatment (tradename Tyregrip) to reduce the potential for runoff-road crashes. The Florida Department of Transportation (FDOT) and the Federal Highway Administration (FHWA) installed the Tyregrip high friction surfacing systems along a 300-foot section of the on-ramp to northbound I-75 from eastbound Royal Palm Boulevard in the city of Weston (Broward County), Florida. The Tyregrip surfacing system consists of a highly-modified exothermic epoxy resin two-part binder usually top dressed with a calcined bauxite with a polished stone value (PSV) of 70%. This system has long-lasting durability and skid resistance properties on both wet and dry pavement conditions. The authors discuss measurements of crash frequency, vehicle speeds, shoulder encroachments, data on the friction factor, tests for variability, and tests for differences in the mean speeds. Travel speeds were found to decrease after the application of the Tyregrip (an average of 3.72 mph under dry pavement conditions and 2.62 mph under wet pavement conditions). The proportion of vehicles encroaching onto the shoulder was found to decrease substantially under wet pavement conditions after the installation of the Typegrip treatment. The authors conclude that the use of Tyregrip may be a practical countermeasure for improving safety at locations that are prone to run-off-road crashes, particularly sharp curves and entry/exit ramps.
Shuo Li - One of the best experts on this subject based on the ideXlab platform.
-
Physical and Mechanical Properties of Epoxy–Bauxite Mortar of High-Friction Surface Treatment
Journal of Materials in Civil Engineering, 2020Co-Authors: Mingliang Xing, Shuo Li, Jie Shan, Bowen GuanAbstract:AbstractHighfriction Surface treatment (HFST) has been widely utilized by state departments of transportation (DOTs) to reduce friction related vehicle crashes. However, although many studies have ...
-
Laboratory Evaluation of Critical Properties and Attributes of Calcined Bauxite and Steel Slag Aggregates for Pavement Friction Surfacing
Journal of Materials in Civil Engineering, 2019Co-Authors: Demei Yu, Shuo Li, Peiliang Cong, Rui Xiong, Ayesha Shah, Yi JiangAbstract:AbstractThe long-term friction performance of safety-focused friction surfacing, especially High-Friction Surface treatment (HFST), relies primarily on the properties of aggregate. Nevertheless, in...
-
Laboratory and Field Evaluation of Single Layer and Double Layer High Friction Surface Treatments
Transportation Research Record, 2019Co-Authors: Shuo Li, Peiliang Cong, Demei Yu, Rui Xiong, Yi JiangAbstract:High friction Surface treatment (HFST) has been proactively used as a solution to extreme friction demands at locations such as horizontal curves, ramps, bridge decks, and intersections. Considerab...
-
Surface texture and friction characteristics of diamond-ground concrete and asphalt pavements
Journal of Traffic and Transportation Engineering, 2016Co-Authors: Shuo Li, Dwayne Harris, Timothy WellsAbstract:Abstract Recently, diamond grinding has gained increasing attention as pavement preservation treatment to restore desired Surface characteristics, particularly friction. Compared to other pavement preservation treatments such as Surface overlays and high friction Surface treatments, diamond grinding may cost less, save construction time, or require minimum maintenance. Diamond grinding produces longitudinal, continuous, and line-type texture that contains corrugations with evenly spaced ridges. The improved Surface texture will immediately enhance pavement Surface friction and reduce the possibility of hydroplaning in rainy weather. However, little information has been documented on the texture characteristics and long-term friction performance of diamond-ground pavements. A field evaluation was conducted to examine the Surface texture and friction characteristics in diamond-ground concrete and asphalt pavements by the authors. Five pavement test sections, including two diamond-ground concrete pavements, one diamond-ground concrete bridge deck, one diamond-ground asphalt pavement, and one transversely tined concrete pavement, were selected for evaluation. Laser scanner testing was performed to capture both macro and microtexture profiles. Locked wheel testing was performed to measure the friction numbers. The test results were examined and compared so as to evaluate two performances, after construction and long-term friction performance of diamond-ground pavements. It was found that longitudinal diamond grinding can provide durable, satisfactory Surface friction performance for both concrete and asphalt pavements.