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Abstract:Low-temperature cracking is a major form of distress that can compromise the structural integrity of asphalt pavements located in cold regions. A review of an Acoustic Emission (AE)-based approach is presented that is capable of assessing the low-temperature cracking performance of asphalt binders and asphalt pavement materials through determining their embrittlement temperatures. A review of the background and fundamental aspects of the AE-based approach with a brief overview of its application to estimate low-temperature performance of unaged, short-term, and long-term aged binders, as well as asphalt materials, is presented. The application of asphalt pavements containing recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) materials to thermal cracking assessment is also presented and discussed. Using the Felicity effect, the approach is capable of evaluating the self-healing characteristics of asphalt pavements and the effect of cooling cycles upon their fracture behavior. Using an iterative AE source location technique, the approach is also used to evaluate the efficiency of rejuvenators, which can restore aged asphalt pavements to their original crack-resistant state. Results indicate that AE allows for relatively rapid and inexpensive characterization of pavement materials and can be used towards enhancing pavement sustainability and resiliency to thermal loading.Keywords: acoustic emission; thermal cracking; asphalt pavements; embrittlement temperatures; recycled asphalt pavements; recycled asphalt shingles; cooling cycles

Perform physical and logical acquisition of iPhone, iPad and iPod Touch devices. Image device file system, extract device secrets (passwords, encryption keys and protected data) and decrypt the file system image. The application allows forensic experts to physically obtain Apple devices running all versions of iOS 12 to iOS 12.1.2 inclusive. The toolkit provides file system extraction for all devices supported by jailbreak without root, and allows decrypting the key chain to extract stored passwords and credentials for authentication. d2c66b5586


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