Laboratory and Field Evaluation of Hot Mix Asphalt with High Contents of Reclaimed Asphalt Pavement - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Laboratory and Field Evaluation of Hot Mix Asphalt with High Contents of Reclaimed Asphalt Pavement write by Clinton Isaac Van Winkle. This book was released on 2014. Laboratory and Field Evaluation of Hot Mix Asphalt with High Contents of Reclaimed Asphalt Pavement available in PDF, EPUB and Kindle. Currently in Iowa, the amount of RAP materials allowed for the surface layer is limited to 15% by weight. The objective of this project was to develop quality standards for inclusion of RAP content higher than 15% in asphalt mixtures. To meet Superpave mix design requirements, it was necessary to fractionate the RAP materials. Based on the extensive sieve-by-sieve analysis of RAP materials, the optimum sieve size to fractionate RAP materials was identified. To determine if the higher percentage of RAP materials than 15% can be used in Iowa's state highway, three test sections with 30.0%, 35.5% and 39.2% of RAP materials were constructed on Highway 6 in Iowa City. The construction of the field test sections was monitored and the cores were obtained to measure field densities of test sections. Field mixtures collected from test sections were compacted in the laboratory in order to test the moisture sensitivity using a Hamburg Wheel Tracking Device. The binder was extracted from the field mixtures with varying amounts of RAP materials and tested to determine the effects of RAP materials on the PG grade of a virgin binder. Field cores were taken from the various mix designs to determine the percent density of each test section. A condition survey of the test sections was then performed to evaluate the short-term performance.
Superpave Mix Design
Superpave Mix Design - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Superpave Mix Design write by Asphalt Institute. This book was released on 2001-01-01. Superpave Mix Design available in PDF, EPUB and Kindle.
Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content
Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content write by Randy Clark West. This book was released on 2013. Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content available in PDF, EPUB and Kindle. TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.
Investigating the Rutting and Moisture Sensitivity of Warm Mix Asphalt with Varying Contents of Recycled Asphalt Pavement
Investigating the Rutting and Moisture Sensitivity of Warm Mix Asphalt with Varying Contents of Recycled Asphalt Pavement - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Investigating the Rutting and Moisture Sensitivity of Warm Mix Asphalt with Varying Contents of Recycled Asphalt Pavement write by Taha Ahmed Hussien Ahmed. This book was released on 2014. Investigating the Rutting and Moisture Sensitivity of Warm Mix Asphalt with Varying Contents of Recycled Asphalt Pavement available in PDF, EPUB and Kindle. To evaluate the performance of Warm Mixture Asphalt (WMA) with varying amounts of recycled asphalt pavement (RAP) in comparison with Hot Mix Asphalt (HMA), comprehensive laboratory and field evaluations were conducted. Mix designs were performed for both WMA with a LEADCAP additive and HMA with large amounts of fractionated RAP materials. Hamburg Wheel Tracking (HWT) test was performed to evaluate the rutting and moisture susceptibility of both HMA and WMA laboratory mixtures. HMA mixtures with up to 50% RAP materials by binder replacement exhibited a better performance than WMA mixtures. However, when RAP materials were increased to 75% both WMA and HMA mixtures showed a superior performance. When a specially designed LEADCAP additive for a mixture with a high RAP content called "RAPCAP" was used, the performance was significantly improved. The existing Asphalt Bond Strength (ABS) test (AASHTO TP91-11) was modified to better evaluate the adhesion bond between asphalt binder and aggregate surface. Based on the modified ABS test results, it was found that the asphalt binder type significantly influenced the adhesion bond. To evaluate the performance of WMA mixtures in the field, test sections were constructed in Iowa, Minnesota and Ohio. The test sections were successfully constructed with less compaction effort than HMA and met the required field densities per each DOT's specification. All HMA and WMA mixtures collected from the test sections passed the HWT and the modified Lottman tests, which indicates high resistance to rutting and moisture damage. The asphalt binders were then extracted and recovered from the field samples then re-graded following AASHTO M320 and AASHTO MP19-10. The recovered asphalt binder grades were found to be higher than the target grades due to the existence of RAP materials in the mixtures except for asphalt binders extracted from WMA mixtures produced using "RAPCAP" additive.
Simple Performance Tester for Superpave Mix Design
Simple Performance Tester for Superpave Mix Design - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Simple Performance Tester for Superpave Mix Design write by Ramon Francis Bonaquist. This book was released on 2003. Simple Performance Tester for Superpave Mix Design available in PDF, EPUB and Kindle. The global response to COVID-19 has demonstrated the importance of vigilance and preparedness for infectious diseases, particularly influenza. There is a need for more effective influenza vaccines and modern manufacturing technologies that are adaptable and scalable to meet demand during a pandemic. The rapid development of COVID-19 vaccines has demonstrated what is possible with extensive data sharing, researchers who have the necessary resources and novel technologies to conduct and apply their research, rolling review by regulators, and public-private partnerships. As demonstrated throughout the response to COVID-19, the process of research and development of novel vaccines can be significantly optimized when stakeholders are provided with the resources and technologies needed to support their response. Vaccine Research and Development to Advance Pandemic and Seasonal Influenza Preparedness and Response focuses on how to leverage the knowledge gained from the COVID-19 pandemic to optimize vaccine research and development (R&D) to support the prevention and control of seasonal and pandemic influenza. The committee's findings address four dimensions of vaccine R&D: (1) basic and translational science, (2) clinical science, (3) manufacturing science, and (4) regulatory science.
