A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Repeatability of Asphalt Strain Gauges
Mechanistic-empirical (M-E) pavement design and analysis have recently made great strides toward widespread implementation in the United States. While some see this design methodology as a new concept, there are currently M-E pavement design methodologies being practiced across the country (1, 2, 3, 4). As the new M-E Pavement Design Guide (MEPDG) is being completed and implemented, more attention is being spent on proper material and pavement response characterization (5). To determine theoretical load-induced responses in pavement structures using the M-E design framework, a pavement structure’s material properties are needed. The resulting mechanistic responses are then coupled with Miner’s Hypothesis (6) and transfer functions to predict pavement life. Transfer functions rely on theoretical strains and pressures to estimate the design life of pavement structures. If these theoretical pavement responses are accurately estimated, the transfer functions allow engineers to design a pavement of adequate thickness. It should be clear as the reader reads this report that this is not talking about the accuracy and precision of stain gauges for a given loading condition. The precision and accuracy include wander, pavement thickness, and other issues besides the accuracy and precision of the strain gauges. So the precision and accuracy are really for strain gauge measurements under somewhat varying conditions. As instrumentation and computing technologies have advanced, it has become possible to measure stresses, pressures, deflections, moisture, temperature, and wheel wander in pavements using embedded instrumentation instead of utilizing computer programs to estimate them (7). When actual measurements from pavement structures are used in transfer functions, the results are threefold. First, the design life of the pavement structure will be more accurately quantified. Second, the transfer functions used to estimate design life can be calibrated and validated using actual field data to improve the design procedure. Last, and perhaps most importantly, field measurements can aid in the refinement and development of theoretical models
Repeatability of Asphalt Strain Gauges
Mechanistic-empirical (M-E) pavement design and analysis have recently made great strides toward widespread implementation in the United States. While some see this design methodology as a new concept, there are currently M-E pavement design methodologies being practiced across the country (1, 2, 3, 4). As the new M-E Pavement Design Guide (MEPDG) is being completed and implemented, more attention is being spent on proper material and pavement response characterization (5). To determine theoretical load-induced responses in pavement structures using the M-E design framework, a pavement structure’s material properties are needed. The resulting mechanistic responses are then coupled with Miner’s Hypothesis (6) and transfer functions to predict pavement life. Transfer functions rely on theoretical strains and pressures to estimate the design life of pavement structures. If these theoretical pavement responses are accurately estimated, the transfer functions allow engineers to design a pavement of adequate thickness. It should be clear as the reader reads this report that this is not talking about the accuracy and precision of stain gauges for a given loading condition. The precision and accuracy include wander, pavement thickness, and other issues besides the accuracy and precision of the strain gauges. So the precision and accuracy are really for strain gauge measurements under somewhat varying conditions. As instrumentation and computing technologies have advanced, it has become possible to measure stresses, pressures, deflections, moisture, temperature, and wheel wander in pavements using embedded instrumentation instead of utilizing computer programs to estimate them (7). When actual measurements from pavement structures are used in transfer functions, the results are threefold. First, the design life of the pavement structure will be more accurately quantified. Second, the transfer functions used to estimate design life can be calibrated and validated using actual field data to improve the design procedure. Last, and perhaps most importantly, field measurements can aid in the refinement and development of theoretical models
Repeatability of Asphalt Strain Gauges
Willis J. R. (author) / Timm D. H. (author)
2009
37 pages
Report
No indication
English
Civil Engineering , Construction Equipment, Materials, & Supplies , Construction Materials, Components, & Equipment , Asphalt strain , Gauges , Mechanistic Empirical Pavement Design , Strains , Pavements , Transfer functions , Road materials , Field measurements , Theoretical models , Mechanistic Emperical Pavement Design Guide (M-EPDG)
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