Influences of alternative friction aggregates on texture and friction characteristics of high friction surface treatment

2022 ◽  
Vol 314 ◽  
pp. 125643
Author(s):  
Chen Chen ◽  
Fan Gu ◽  
Michael Heitzman ◽  
Buzz Powell ◽  
Karol Kowalski
Keyword(s):  
Surface Treatment ◽  
Friction Surface ◽  
Friction Characteristics

scholarly journals Influence of Macrotexture and Microtexture on the Skid Resistance of Aggregates

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Bowen Guan ◽  
Jiayu Wu ◽  
Chao Xie ◽  
Jianhong Fang ◽  
Haile Zheng ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Correlation Analysis ◽  
Surface Treatment ◽  
Critical Point ◽  
Friction Surface ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Skid Resistance ◽  
Mean Square

This article intends to study the influence of macrotexture and microtexture on the skid resistance of four types of aggregates. For this purpose, fractal dimension (D), root mean square height (Rq), and Polished Stone Value (PSV) were tested. The Pearson correlation coefficients between PSV and D or Rq in the interval of different polishing cycles were calculated and analyzed with correlation analysis. The relationships between PSV and Rq were also established. The results showed that the PSV development was approximately divided into 3 stages including accelerated attenuation stage, decelerated attenuation stage, and stabilization stage. There is a critical point of the entire polishing cycles. When the number of the polishing cycles exceeds this critical point, microtexture replaces macrotexture to play a major role in the skid resistance of aggregates. In the accelerated attenuation stage, macrotexture plays a major role in the skid resistance of aggregates. In the decelerated attenuation stage and stabilization stage, microtexture gradually plays a major role in the skid resistance of aggregates. Because of roughest microtexture in the stabilization stage, bauxite can provide the highest levels of skid resistance for high friction surface treatment over the long-term period.

Identification of Site Characteristics for Proactive High-Friction Surface Treatment Site Selection using Sensor-Based, Detailed, Location-Referenced Curve Characteristics Data

2018 ◽  
Vol 2672 (38) ◽  
pp. 69-80
Author(s):  
Yichang (James) Tsai ◽  
Yi-Ching Wu ◽  
Cibi Pranav P. S. ◽  
Chengbo Ai
Keyword(s):  
Surface Treatment ◽  
Site Selection ◽  
Friction Surface ◽  
Sensor Data ◽  
Spatial Integration ◽  
Department Of Transportation ◽  
Crash Data ◽  
Run Off ◽  
Site Characteristics

The Georgia Department of Transportation (GDOT) has developed a proactive high-friction surface treatment (HFST) program for curve sites prone to run-off-road (ROR) crashes. Using crash data and a single-criterion, ball bank indicator (BBI) value, GDOT seeks to maximize the return on its HFST investment. GDOT has partnered with Georgia Tech to identify additional factors for its HFST site-selection (HFST-SS) decision-making process by leveraging high-resolution, full-coverage sensor data (e.g., GPS and LiDAR). This paper proposes a methodology to identify site characteristics that can be used in GDOT’s HFST-SS process by leveraging the sensor data and automatically extracting roadway curve features as follows: (a) roadway data collection using state-of-the-art sensing technologies, (b) automatic extraction of detailed site characteristics data and curve information, (c) curved-based roadway segmentation using the extracted curve information; (d) spatial integration of curve-site characteristics data (CSCD); (e) analysis of CSCD and ROR crashes to identify additional factors for HFST site selection. A case study using CSCD extracted from Georgia State Route 2 demonstrates the proposed methodology. Results show that on sharp curves having comparable site characteristics, vertical grades greater than 3% play an important role in ROR crashes. Therefore, a vertical grade greater than 3% could be considered as an additional HFST-SS factor along with the current BBI criterion.

Study on Friction Characteristics According to Drawing Variables in Press Drawing Process

2013 ◽  
Vol 680 ◽  
pp. 440-445
Author(s):  
Young Moo Heo ◽  
Jong Deok Kim ◽  
Yong Jun Jeon
Keyword(s):  
Friction Coefficient ◽  
Surface Treatment ◽  
Tool Material ◽  
Steel Plates ◽  
Drawing Process ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Friction Characteristics ◽  
The Press ◽  
Tool Surface

Friction is generated between a press tool and a material during the inflow of material in an automotive press drawing process. Currently, there is deficienttechnical information on such tool-material friction properties. This study is accordingly aimed to understand friction characteristics by investigating them from drawing variables in the press deep-drawing process for steel plates of 590MPa grade and above that are recently being applied for the reduction of weight and improvement of safety of automobiles. The drawing variables in this study are blank holder holding pressure, drawing velocity, and tool surface treatment, which are tested and applied for stamping analysis. The results showed that for holding pressure and drawing velocity, friction coefficient decreases as holding pressure and drawing velocity increases. In case of friction properties according to tool surface treatment, friction coefficient is lower in surface-treated tools compared to non-surface-treated tools, which verifies the need for surface treatment when fabricating press tools. In addition, this study ascertained the need to have a stamping analysis that considered actual drawing variables when analyzingforming by verifying the results of drawing simulations after applying the experimented friction coefficient in the stamping analysis.

High Friction Surface Treatment Deterioration Analysis and Characteristics Study

2021 ◽  
pp. 036119812110296
Author(s):  
Cibi Pranav ◽  
Yi-Chang (James) Tsai
Keyword(s):  
Surface Treatment ◽  
Performance Measures ◽  
Friction Surface ◽  
Laser Scanning ◽  
Performance Monitoring ◽  
Performance Measure ◽  
Safety Performance ◽  
Test Track ◽  
Percentage Area ◽  
Aggregate Loss

High friction surface treatment (HFST) is used to improve friction on curved roadways, especially on curves that have a history of wet pavement crashes. Observations on the long-term performance monitoring of HFST sections at the National Center for Asphalt Technology (NCAT) Test Track showed friction (skid number, SN) dropped significantly at the end of service life of HFST, creating unsafe driving conditions. There is no clear, observed friction deterioration trend to predict the friction drop when using friction performance measures like SN. Therefore, there is an urgent need to explore and develop supplementary HFST safety performance measures (such as aggregate loss) that can correlate to friction deterioration and provide predictable, cost-effective, and easily measurable results. The objectives of this paper are to (i) analyze the correlation between HFST aggregate loss percentage area and friction value using a dynamic friction tester (DFT), and (ii) study the characteristics of HFST deterioration associated with aggregate loss, at the NCAT Test Track and at selected HFST curve sites in Georgia (using 2D imaging and high-resolution 3D laser scanning). Results show a strong correlation between HFST aggregate loss percentage area and DFT friction coefficient. Where friction measurement is used as the primary safety performance measure, it is recommended that HFST aggregate loss be used as a supplementary performance measure for monitoring the HFST safety performance deterioration. Aggregate loss can be easily identified by characteristics such as color and texture change. Preliminary texture analyses of 3D HFST surface profiles show lower mean profile depth (MPD) and ridge-to-valley depth (RVD) texture indicators can also identify loss of aggregate spots on HFST surface.

Performance Evaluation of an Innovative High-Friction Surface Treatment

2019 ◽  
Vol 2673 (3) ◽  
pp. 485-493
Author(s):  
Xiaoyu W. Chen ◽  
Michele A. Lanotte ◽  
M. Emin Kutay ◽  
Larry Galehouse
Keyword(s):  
United States ◽  
Surface Treatment ◽  
Friction Surface ◽  
Low Cost ◽  
Surface Characteristics ◽  
Cost Effective ◽  
The United States ◽  
Skid Resistance ◽  
The Road ◽  
On The Road

High-friction surface treatment (HFST) is effective for improving pavement surface characteristics and enhancing drivers’ safety on the road. However, common HFST applications are not cost-effective and provide only limited preservation benefits to the existing pavement structure. In this study, the performance of a new HFST, consisting of corundum sand and waterborne epoxy, has been evaluated through laboratory testing. A battery of laboratory tests was performed to compare this new HFST against three common HFST applications used in the United States. Three aspects of the performance were investigated: (i) improvement of skid resistance, (ii) durability to environmental effects (moisture damage and freeze–thaw cycles), and (iii) the effect on an existing crack through semi-circular bending tests. The results showed that the application of the low-cost HFST provides an improvement of skid resistance as good as or better than the traditional HFST applications. Furthermore, since the aggregates used in this technique are much finer than the traditional HFST applications, the treatment looks more like a slurry, and it has the potential to fill the existing cracks with a width of 1.5 ± 0.1 mm and retard further propagation of the cracks. Results revealed that this new HFST technology (developed by a Chinese manufacturer) has the potential to lower the cost compared with materials and practices currently used in the United States.

Test on Slip Coefficient of High-Strength Bolted Slip-Critical Connections after Fire

2013 ◽  
Vol 351-352 ◽  
pp. 1368-1371
Author(s):  
Mei Chun Zhu ◽  
Yan Jun Jiang ◽  
Guo Biao Lou ◽  
Guo Qiang Li
Keyword(s):  
Surface Treatment ◽  
Friction Surface ◽  
Steel Structures ◽  
High Strength ◽  
Test Results ◽  
Slip Coefficient ◽  
Heating And Cooling ◽  
Load Tests ◽  
Structural Inspection ◽  
Key Parameter

Fire safety is a major concern with steel structures. Actually, steel structures were not fatally destroyed in most cases of fire. These damaged steel structures may be reused after structural inspection, safety appraisal and necessary repair. Bolted connections are the most widely used connection in steel structures. Slip coefficient is a key parameter to calculate the slip bearing capacity of bolted slip-critical connections. Currently there are few research results available about slip coefficient of bolted slip-critical connections after fire. To obtain the effect of heating and cooling on slip coefficient, a series of slip load tests on connections that had been heated and cooled to ambient temperature were carried out in this study. Methods of friction surface treatment included shot blast and painting inorganic zincs after shot blast. Test results show that heating and cooling have a great effect on slip coefficient of connections with two methods of friction surface treatment, among which effect on connections with shot blasting surfaces is more significant.

scholarly journals Determination of Friction Performance of High Friction Surface Treatment Based on Alternative Macrotexture Metric

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6895
Author(s):  
Hua Zhao ◽  
Fulu Wei ◽  
Ce Wang ◽  
Shuo Li ◽  
Jie Shan
Keyword(s):  
Surface Treatment ◽  
Friction Surface ◽  
Surface Friction ◽  
Test System ◽  
Test Methods ◽  
Friction Test Methods ◽  
Profile Depth ◽  
Aggregate Loss ◽  
Friction Performance

Surface friction is currently the most common metric for evaluating the performance of high friction surface treatment (HFST). However, friction test methods such as the locked wheel skid tester (LWST) commonly provide a spot measurement. Large variations may arise in the LWST testing on curves. Based on 21 actual HFST projects, a study was performed to use a macrotexture metric, i.e., the mean profile depth (MPD) to evaluate HFST’s performance and improve its quality control (QC)/quality assurance (QA) procedures. The material properties were presented to understand the aspects of HFST. The method for calculating MPD was modified to account for the variations of macrotexture measurements. A vehicle-based test system was utilized to measure MPD periodically over an 18-month period since HFST installation. Statistical analysis was performed on the MPD measurements to identify the effects of influencing factors. Compared with the friction from LWST, MPD was equally effective in evaluating HFST performance. However, the use of MPD eliminated the errors as arisen in LWST testing and made it possible to detect surface distresses, including aggregate loss, delamination, and cracking. The expected overall MPD may be calculated by combining the MPD measurements made three months after installation at different HFST sites and used as a metric for evaluating HFST performance and QC/QA.

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