Zhang, Mitigation strategies for reflection cracking in rehabilitated pavements - A synthesis, Inter. Scullion, Reflection cracking-based asphalt overlay thickness design and analysis tool, Transp. Findings from this study are of immediate assistance to the future FAA airport pavement research. In addition, a set of strain, thermally induced fatigue, and fracture parameters were used to derive ratios between the full-scale and laboratory tests, and a conceptual two-stage failure model was proposed. Once a crack initiated, it can penetrate a thin overlay in a very short period of time. It was observed that increasing overlay thickness significantly delayed the occurrence of reflection cracks, however not reduced the crack progression in the horizontal direction. This paper presents a comprehensive Federal Aviation Administration (FAA) study of full-scale and laboratory tests to evaluate the impact of overlay thickness on the initiation and propagation of reflection cracks. Although this option provides better thermal insulation to the concrete, which helps to reduce thermal movements, the performance is still somewhat empirical. News Release: Prize Winners Announced in $1.In order to delay reflection cracks, a thicker overlay is sometimes applied than that required for structural purposes alone.Feature Article: S&T’s Transportation Security Laboratory Evaluates Artificial Intelligence and Machine Learning Technologies.News Release: DHS S&T Receives National Interagency Partnership Award.TSL also provides a range of actual explosives to system manufacturers to develop software necessary to locate them within various concealment scenarios. TSL’s Independent Test and Evaluation group provides certification and qualification tests and laboratory assessments that provide DHS components, including the Transportation Security Administration, with critical information about equipment and its ability to detect explosives. Efficient Certification and Qualification Test Services to Help Industry Usher In Solutions TOPs help industry understand the detection problems and offer the expertise to assist with technical solutions. TSL’s Technology Optimization Partnerships (TOPs) process is a public –private enterprise designed to quickly mature and deploy detection technologies. Partners work with TSL to develop capabilities and reduce the time needed to deliver the capabilities to the front line. TSL has more than 30 cooperative research and development agreements with industry and academia. Public–Private Partnerships That Expedite Transportation Security Solutions Two satellite facilities at the Tyndall Reactive Materials Group (TRMG) located in Panama City, FL and the Joint FBI-TSA-S&T Terrorist Explosive Device Analytical Center (TEDAC) Improvised Explosives Detection and Synthesis (TIEDS) Center in Huntsville, AL provide TSL with the capability and flexibility to quickly respond to emerging threats. Its blast-resistant laboratories are equipped to evaluate explosives detection equipment and imaging equipment against an extensive library of domestic, foreign and homemade explosives. TSL’s 12-acre secure campus includes specialized explosive storage and handling areas and a multi-laboratory infrastructure designed for applied research, test and evaluation. Unique Facilities and Laboratory Capabilities In 2014, TSL processes were re-accredited for A2LA 17025 and ISO 9001 certifications, thereby continuing to meet the most rigorous and internationally recognized standards. These talented technical experts have more than 1,000 years of experience collectively. TSL’s staff of more than 100 employees includes physicists, chemists, engineers and mathematicians who are leaders in explosives detection and mitigation.
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