Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Macrotexture"”.
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Enhancing Pavement Surface Macrotexture Characterization
… for transportation practitioners regarding macrotexture characterization. Important pavement surface characteristics, or tire-pavement interactions, such as friction, tire-pavement noise, splash and spray, and rolling resistance, are significantly influenced by pavement macrotexture. This …
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Enhancing Network-Level Pavement Macrotexture Assessment
Pavement macrotexture has been shown to influence a range of safety and comfort issues including wet weather friction, splash and spray, ambient and in-vehicle noise, tire wear, and rolling resistance. While devices and general guidance exist to measure macrotexture, the wide-scale collection and …
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Comparison of Macrotexture Measuring Devices Used in Virginia
This thesis compared macrotexture measurements obtained using the volumetric method (Sand Patch) and three laser-based devices: MGPS system, ICC laser profiler, and Circular Texture Meter (CTMeter). The study used data from three sources: two controlled experiments conducted at the Virginia Smart …
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Evaluation of the Repeatability and Reproducibility of Network-Level Pavement Macrotexture Measuring Devices
… and reproducibility of two high-speed macrotexture measuring systems. The first portion of the study collected macrotexture measurements using the two high-speed systems on the Virginia Smart Road facility and validated the reproducibility of the mean profile depth (MPD) measurements …
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Enhancement of Network Level Macrotexture Measurement Practices through Deterioration Modeling and Comparison of Measurement Devices for Integration into Pavement Management Systems
… integrate measurement and prediction of surface macrotexture for use in pavement management systems. This was achieved through two experiments, the first modeled the behavior of a binder-rich stone matrix asphalt when subjected to traffic loading using a heavy vehicle simulator to report the …
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Short-term Comparison of Frictional Properties of Superpave and Balance Mix Design Hot Mix Asphalt Mixes
… into volumetric properties that may influence macrotexture. The thesis analyzed the initial friction and macrotexture of a series of experimental sections built to support VDOT BMD implementation efforts. A Side-Force Coefficient Road Investigation Machine (SCRIM) was used to measure friction …
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Improved Terrain Measurement System for Estimation of Global Terrain Features, Surface Roughness, and Texture
… surface roughness alone and reject either fine macrotexture or large-scale global features. This work proposes a novel improvement to the terrain measurement system, by increasing the capability to measure the terrain surface at a variety of scales. By increasing the scales of measurement, …
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Evaluation Of Pavement Surface Friction Seasonal Variations
… of equipment were conducted in the same day. Macrotexture measurements were taken using a Circular Texture Meter on the same locations used for the DFTester measurements. In order to compare friction measurements on the different surfaces, the monthly friction values were normalized by …
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Laboratory investigation of diamond grinding and grooving textures on concrete pavement surfaces
… surface. The practice results in a strong macrotexture that is adequate to provide an improvement in the skid resistance of the pavement. This study initiates the process of investigation of the parameters and the effectiveness of diamond grinding in a laboratory setting. It was observed …
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Quality Assurance for Chip Seals Using Mean Profile Depth
… This study used Mean Profile Depth (MPD) as a macrotexture metric for the quality assurance of chip seals. Field data were collected using state-of-the-art equipment from the Virginia Department of Transportation (VDOT) area. Considering both qualitative (visual assessment) and quantitative …
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Reducing Highway Crashes with Network-Level Continuous Friction Measurements
… and is provided by pavement microtexture and macrotexture. The amount of skid resistance depreciates over time due to the polishing action of traffic, and for this reason, the skid resistance should be monitored with friction testing equipment. The equipment use one of four test methods to …
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Comprehensive investigation of using tire-derived aggregate in chip seal subjected to various traffic and environmental conditions
… devices were manufactured and used. A 3D macrotexture measurement technique was also developed for chip seal surfaces. The results indicated that up to 50% replacement of mineral aggregate with crumb rubber did not negatively affect the performance of chip seal in intermediate …
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Effect of hot working characteristics on the texture development in AISI 430 and 433 ferritic stainless steel
… temperature in multi-pass tests. Both macrotexture (XRD) and microtexture (EBSD) analyses were employed to characterise and study the texture present in these steels. It was found that the texture in the central layer of the compressed sample is a strong recrystallization-type. The …
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Non-contact Methods for Detecting Hot-mix Asphalt Nonuniformity
… A method using a dynamic (laser-based) surface macrotexture instrument showed great promise, but it revealed that it may actually miss significant segregated areas because they only measure very thin longitudinal lines. The main objective of this research is to develop a non-contact system for …
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Quantifying the Impact of Pavement Surface Properties on Road Safety: A Data-Driven Approach
… such as Skid Friction Number at 40 mph (SFN40), Macrotexture via Mean Profile Depth (MPD), and pavement age and classification, there incremental value within SPFs remain under quantified. This gap leaves agencies uncertain about surface measures materially improving prediction and how large …
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An investigation into the effect of waterblast on concrete and asphalt surfaces
… can lead to loss of pavement strength as well as macrotexture. This study recommends greater vigilance when dealing with asphalt surfaces and hydrocleaning at lower pressures than used for concrete. Also due to the asphalt binder properties, hydrocleaning settings should differ with temperature. …