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Author: Randy Clark West Publisher: ISBN: 9780309308038 Category : Pavements, Asphalt Languages : en Pages : 244
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 779: Field Performance of Warm Mix Asphalt Technologies compares material properties and field performance of warm mix asphalt and control hot mix asphalt pavement sections constructed at 14 locations across the United States between 2006 and 2010."--Publisher description.
Author: Randy Clark West Publisher: ISBN: 9780309308038 Category : Pavements, Asphalt Languages : en Pages : 244
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 779: Field Performance of Warm Mix Asphalt Technologies compares material properties and field performance of warm mix asphalt and control hot mix asphalt pavement sections constructed at 14 locations across the United States between 2006 and 2010."--Publisher description.
Author: Washington State University Publisher: ISBN: 9780309446334 Category : Pavements, Asphalt Languages : en Pages : 116
Book Description
Compares material properties and field performance of warm mix asphalt (WMA) and control hot mix asphalt (HMA) pavement sections constructed at 28 locations across the United States. It explores significant determinants for each type of distress and potential practices regarding the use of WMA technologies.
Author: Ramon Francis Bonaquist Publisher: Transportation Research Board ISBN: 0309155592 Category : Science Languages : en Pages : 111
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies. Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at temperatures approximately 50°F (28°C) or more cooler than typically used in the production of hot mix asphalt (HMA). The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. There are important environmental and health benefits associated with reduced production temperatures including lower greenhouse gas emissions, lower fuel consumption, and reduced exposure of workers to asphalt fumes. Lower production temperatures can also potentially improve pavement performance by reducing binder aging, providing added time for mixture compaction, and allowing improved compaction during cold weather paving. Appendices to NCHRP Report 691 include the following. Appendices A, B, and D are included in the printed and PDF version of the report. Appendices C and E are available only online.
Author: Faramarz Farshidi Publisher: ISBN: 9781267758804 Category : Languages : en Pages :
Book Description
In recent years Warm Mix Asphalt (WMA) technologies have been used to modify asphalt binders, with the following objectives: to decrease production and construction temperatures, reduce fumes and emissions, increase haul distance, and improve the workability of the mix. Reduced temperatures at the plant and during laydown and compaction are hypothesized to positively impact long-term oxidative aging behavior due to less oxidation/aging and result in less emissions during production and construction due to reduced production and construction temperatures. The purpose of this investigation was to quantify these improvements with respect to long-term oxidative aging in the field and environmental benefits with respect to volatile organic compounds, semi-volatile organic compounds and poly cyclic aromatic hydrocarbons in order to confirm or deny this hypothesis. This research evaluated the potential durability of WMA and Rubberized Warm Mix Asphalt (R-WMA) binders with respect to long-term aging through characterization of field-aged binders extracted and recovered from field cores. The results were compared to the control conventional Hot Mix Asphalt (HMA) and Rubberized Hot Mix Asphalt (R-HMA) samples. Binders were extracted and recovered from thirteen different test sections and a total of seven different WMA technologies were evaluated in this study. The Dynamic Shear Rheometer (DSR) was used to evaluate the rheological properties of the binders at high temperatures with respect to rutting performance in the field. The Bending Beam Rheometer (BBR) was used to characterize low temperature properties of the binder samples. A new testing procedure was developed to measure and characterize the rheological properties of the R-HMA and R-WMA binders with respect to performance-related properties in the field. The rheological results indicated that depending on the WMA technology used, the addition of WMA technologies and reduced production and compaction temperatures result in increase or decrease rutting resistance performance for WMA and R-WMA binders with respect to permanent deformation at high temperatures in the field. Both WMA and R-WMA binders studied meet the established thermal cracking criteria with respect to low temperature cracking in the field. The aging kinetics curves for WMA-treated binders are parallel to the control binders and the addition of WMA technologies including organic, chemical and mechanical foaming technologies studied in this research did not result in a different aging kinetics trend with respect to long-term aging in the field. A portable "flux" chamber was designed and fabricated to capture and directly measure emissions during paving operations. Emissions were collected in activated charcoal sorbent tubes for characterizing volatile organic compounds and semi-volatile organic compounds. XAD-2 resin tubes and filters were used to capture the gaseous phase and particulate phase of the PAH compounds, respectively. A reliable analytical method was developed to identify and quantify alkane emissions using gas chromatography mass spectrometry (GC/MS) in the laboratory. A separate method was developed for identification and characterization of trace level PAH compounds of the asphalt fumes. The results demonstrated that the warm mix asphalt technology type, plant mixing temperature and level of compaction significantly influence the emission characteristics throughout paving operations. Moreover, the emissions kinetics indicated that the majority of the reactive organic gases are volatilized in the first hour after sampling initiation (immediately after production and before compaction). To better understand and identify any chemical composition changes of the binder due to WMA technologies, nuclear magnetic resonance spectroscopy (NMR) was used for understanding structural complexities of HMA and WMA binder molecules. Qualitative analysis of both carbon and hydrogen atoms with HMA and WMA binders showed that the molecular structures of the binders are not significantly changed by the effect of WMA technologies.
Author: Kwadwo Ampadu Boateng Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This study focused on the assessment of long-term performance of asphalt pavements containing warm mix asphalt technologies in Louisiana. A total of five rehabilitation projects were studied in the state of Louisiana. The study consisted of engineering desk analyses of field performance indicators, indices and the initial laboratory performance indicators measured for five rehabilitation projects. The engineering desk study consisted of a review of literature from previous WMA technology projects done in Louisiana. Additionally, data was acquired and validated from the Louisiana Pavement Management System (PMS). Pavement performance indicators (i.e., cracking (transverse, longitudinal, and fatigue cracking), roughness, rutting, and pavement indices and pavement condition index data acquired from PMS were analyzed using statistical methods. Furthermore, laboratory test data for mechanical performance indicators at the construction stage such as loaded wheel tracking (LWT) rut depth, semi-circular bend (SCB) Jc , flow number, and dissipated creep strain energy (DCSE) were obtained from LTRC database and published reports. Analysis to link initial laboratory mechanical performance indicators to field performance indicators were performed. In general, similar, or better pavement performance indicators for rutting and cracking (longitudinal, transverse, and alligator) was reported for WMA test sections compared to their companion hot mix asphalt (HMA) sections. Additionally, the LWT rut depth was found to be a better indicator of field rutting performance than the flow number parameter. It should be noted that SCB Jc parameter was found to correctly rank more field cracking indicators than the DCSE parameter and hence may be a better indicator of field cracking performance than the DCSE parameter. Additionally, the actual field performance indices for both Conventional HMA AND WMA test sections were similar or higher than the predicted indices based on LA DOTD performance curve formulae. Which indicates a better or similar distress performance after seven to ten years in service.
Author: James G. Speight Publisher: Butterworth-Heinemann ISBN: 0128005017 Category : Technology & Engineering Languages : en Pages : 652
Book Description
Asphalt is a complex but popular civil engineering material. Design engineers must understand these complexities in order to optimize its use. Whether or not it is used to pave a busy highway, waterproof a rooftop or smooth out an airport runway, Asphalt Materials Science and Technology acquaints engineers with the issues and technologies surrounding the proper selection and uses of asphalts. With this book in hand, researchers and engineering will find a valuable guide to the production, use and environmental aspect of asphalt. - Covers the Nomenclature and Terminology for Asphalt including: Performance Graded (PG) Binders, Asphalt Cement (AC), Asphalt-Rubber (A-R) Binder, Asphalt Emulsion and Cutback Asphalt - Includes Material Selection Considerations, Testing, and applications - Biodegradation of Asphalt and environmental aspects of asphalt use
Author: Randy Clark West
Author: Randy Clark West
Author: Washington State University
Author: 
Author: Ramon Francis Bonaquist
Author: Faramarz Farshidi
Author: Asphalt Institute
Author: Kwadwo Ampadu Boateng
Author: Cindy K. Estakhri
Author: James G. Speight
Author: Nathan Bower