http://yetl.yabesh.ir/yetl1/handle/yetl/4255483 2026-04-28T19:44:44Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310345 Combining Ultrasonic Pulse Velocity and Nonlinear Ultrasonic Techniques to Assess Concrete Strength Alnuaimi, Hamad; Amjad, Umar; Alnuaimi, Yousef; Kundu, Tribikram Nonlinear ultrasonics (NLU) has grown in importance over the past years. The viability of applying the newly developed NLU technique called the Sideband Peak Count-Index (SPC-I) to estimate the 28-day unconfined compressive strength (UCS) of cylindrical concrete specimens is investigated. In addition, the SPC-I technique is combined with the conventional ultrasonic pulse velocity (UPV) technique to achieve more precise UCS estimations than would be possible with a single estimation parameter. Sixteen conventional general-purpose concrete specimens are cast utilizing water-to-cement (W/C) ratios of 0.4, 0.5, 0.55, and 0.6. To ensure the reproducibility of results, experimental operations are performed utilizing consistent testing protocols and instruments. The SPC-I is determined to be a viable parameter that can be used to estimate the UCS value of concrete specimens with high accuracy. In addition, when the SPC-I is combined with the UPV, the resulting estimates become even more accurate and reliable than when utilizing only UPV values. 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310307 In Situ Acoustic Emission Investigation of Asphalt Fracture Process and Damage Quantification for Different Asphalt Mixtures Zhu, Yu; Wang, Haixu; Sun, Xiaojun; Li, Feng; Guan, Xuefei; Huang, Min; He, Jingjing The identification of cracking damage and the dynamic diagnosis of damage evolution are of great importance to prolong the service life of asphalt mixture materials. Acoustic emission (AE) can identify the formation and propagation of cracks by detecting the released energy of the damage; therefore, it provides a viable real-time technique to estimate the damage state in the context of structural health monitoring. In this study, the crack formation and propagation of three different asphalt mixtures were investigated using in situ AE monitoring and microscopy imaging. A three-point bending test was performed using specimens fabricated from three different types of asphalt mixtures. The variation of AE parameters such as the cumulative AE energy and the AE count was obtained and correlated with the crack sizes to characterize the damage process of the three mixtures. Based on the AE parameters, the whole damage process can be divided into three distinct phases, namely, the elastic deformation, damage accumulation, and crack propagation. The AE parameters in the three different mixtures show unique features, and they can be used to capture the transition between phases and identify the damage state. A universal power law model is proposed to correlate the AE energy and the crack density for different types of asphalt mixtures, providing a viable means for damage quantification and predictive maintenance. 2024-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310281 Erratum: “Application of Mechano-luminescence-Optoelectronic Composites for Delamination Detection in Fiber Reinforced Polymer Composites” [ASME J. Nondestructive Eval. Diagn. Progn. Eng. Syst. 7(4), p. 041004; DOI: 10.1115/1.4065548] Mongare, Alfred The following co-author was excluded from the original publication: Donghyeon Ryu. 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310259 Sideband Peak Count Technique for Monitoring Bond–Slip Behavior Between Reinforcement Systems and Masonry Castellano, Anna; Pinchuk, Nataliia; Fraddosio, Aguinaldo; Martellotta, Gianfranco; Piccioni, Mario Daniele; Kundu, Tribikram The use of Fabric-Reinforced Cementitious Matrix (FRCM) composites has become a cornerstone in strengthening several types of structures, ranging from reinforced concrete structures to historical masonry constructions. It is crucial to experimentally assess the effectiveness of the application of the reinforcing layer. Indeed, the performance of FRCM reinforcing interventions highly depends on the bonding at the matrix–fiber and matrix–substrate interfaces. Therefore, the experimental characterization of FRCM bond behavior is essential for designing and ensuring the durability of reinforcement systems. To address this, we have proposed using an innovative nonlinear ultrasonic method: the Side-band Peak Count (SPC) technique. Specifically, the SPC approach has been applied to analyze ultrasonic test results obtained during Double-Lap Shear Tests (DLT) conducted on masonry specimens reinforced with B-FRCM (basalt fiber textile FRCM). We show that it is possible to correlate nonlinear ultrasonic parameters with the shear stress distribution at the reinforcement–masonry interface. Additionally, a relatively new nonlinear ultrasonic parameter, the SPC index, is shown to be effective in monitoring the evolution of the shear stress–slip relationship at this interface, a crucial aspect for understanding the mechanics of the reinforcement–substrate interaction. The nonlinear ultrasonic results have been compared with the results of DLT debonding tests to validate the proposed methodology. The effectiveness of the SPC technique is investigated and discussed. Finally, we have developed a robust numerical model to analyze the bond behavior between the reinforcement and masonry. The numerical model is valuable for both the design of experimental tests and the validation of the experimental results. 2025-01-01T00:00:00Z