That include a lack of precise control of the paving profile, restrictions on Patent Office awarded a patent to FIU,Įntitled “Three-Dimensional Paving.” The free-floating screed has drawbacks What is your vision for 3-Dimensional paving? Once the raveling statistics were compiled, we correlated raveling with construction and material data and developed guidance to reduce OGFC raveling.
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This allowed us to expedite the work and improve the safety of our data collection crew. We wrote a simple program to extract location data and compute the raveled area, extent and severity of raveling. Cellphones can keep track of the picture location in the form of coordinates. We used a smartphone mounted on a car windshield to video the pavement at the speed of traffic. In the process, we developed a simple tool. OGFC is used in all high-speed roads in Florida. We investigated the raveling of open graded friction course (OGFC) in Southeast Florida. How can pavement raveling be effectively investigated using a smartphone? FDOT is evaluating the implementation of this concept in asphalt quality control and acceptance. FTM measurements, when coupled with core density data, can give a good indication of segregation. Segregation has been traditionally identified by visual inspection.
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Segregation is the separation of coarse and fine aggregates which causes the asphalt to have more voids, hold more water and deteriorate faster over time.
FDOT TRAINING VIDIEO ON ASPHALT TEXTURE PORTABLE
FTM is a portable laser-based device that measures the surface texture of pavement in terms of mean profile depth. How is the Florida Texture Meter changing the way we can detect asphalt pavement segregation?įlorida Texture Meter (FTM) is a tool developed by FDOT to quantify asphalt texture and detect segregation. It is hard to turn away from the opportunity to The U.S., pavements are among the most extensive assets with more than three Great Britain’s success in the past to its effective transportation systems. The growth andĭevelopment of a nation are tied to its transportation system. Human body, without them, the body does not function. The transportation system is like the blood vessels in a What drew you to transportation engineering? Professor of Practice at Florida International University’s Department of Civil
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It is typically measured using sand cone texture depth measurement and will vary depending on the voids of the surfacing.We talk with leading educators and researchers to learn moreĪbout the people and topics of asphalt technology.ĭr. Macro-texture is another component when addressing skid resistance and it gives consideration to a material’s propensity to ‘sheet’ water during significant rain events. Whilst suitable micro-texture results can be measured at the time of construction, poor quality material that does not possess adequate durability characteristics can lead to ‘polishing’ of the stone and a reduced level of skid resistance to the road user. It can vary significantly from the surface to surface, largely depending on a) the dominant constituent of the material, it’s geometry and flakiness and b) the presence of binder and its cover over the parent material. Micro-texture is the skid resistance or the resulting frictional potential provided by the material interface of the vehicle tyre and the pavement surface during accelerating and braking and can be measured using methods such as the British pendulum test. Skid resistance is a form of measurement that correlates to the stopping distance of a vehicle travelling at speed for a chosen material and gives consideration to two underlying variables, namely micro and macro-texture. Skid Resistance – To address road safety in the application of new road construction and rehabilitation, a range of factors must be considered including vehicle speed, road alignment, sight distance and many more.Īside from these factors, key consideration must also be given to the material selection and design of the pavement wearing course and any implications regarding skid resistance of the running surface. Soil Stabilization & Civil Construction.Agriculture Land, Resource & Site Management.