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Acoustic emission (AE) techniques have successfully been used for assuring the structural integrity of large rocket motorcases since 1963, and their uses have expanded to ever larger structures, especially as structural health monitoring (SHM) of large structures has become the most urgent task for engineering communities around the world. The needs for advanced AE monitoring methods are felt keenly by those dealing with aging infrastructures. Many publications have appeared covering various aspects of AE techniques, but documentation of actual applications of AE techniques has been mostly limited to reports of successful results without technical details that allow objective evaluation of the results. There are some exceptions in the literature. In this Special Issue of the Acoustics section of Applied Sciences, we seek contributions covering these exceptions cited here. Here, we seek contributions describing case histories of AE applications to large structures that have achieved the goals of SHM by providing adequate technical information supporting the success stories. Types of structures can include aerospace and geological structures, bridges, buildings, factories, maritime facilities, off-shore structures, etc. Experiences with AE monitoring methods designed and proven for large stru

acoustic emission --- thermal cracking --- asphalt pavements --- embrittlement temperatures --- recycled asphalt pavements --- recycled asphalt shingles --- cooling cycles --- closed-form solution --- outlier --- time difference of arrival --- weight estimation --- structural diagnosis --- attenuation --- source location --- sensing --- signal processing --- structural health monitoring --- time series analysis --- b-value --- natural time --- critical phenomena --- reliability --- structural integrity --- crack growth --- fatigue life prediction --- uncertainty analysis --- nondestructive testing --- non-destructive testing --- hydrotreater --- bridge --- high temperature --- gas adsorber --- rotary kiln --- dragline --- acoustic emission (AE) --- non-destructive methods (NDT) --- diagnostic methods --- bridges --- structural health monitoring (SHM) --- acoustic emission swarm --- 2011 Tohoku earthquake --- repeating earthquake --- multiplet --- crustal movement --- optimized EEMD --- 2D-MUSIC --- composite structure --- impact localization --- part qualification --- structural design --- composites --- nondestructive evaluation (NDE) --- in situ acoustic emission (AE) monitoring --- mines --- host rock --- remote monitoring --- corrosion --- nuclear facilities --- alkali-silica reaction --- pattern recognition --- confinement --- damage evaluation --- beam --- vibration --- high-rate dynamics --- n/a

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Most of the typical materials employed in today’s constructions present limitations, especially concerning their durability, in either common or severe environmental conditions, and their impact on the environment. In response to these issues, academic and industrial efforts around the world have been devoted to developing new smart materials that can provide efficient alternatives, improve the energy efficiency of buildings, or can upgrade, repair, or protect existing infrastructures. Different and wide technological innovations are, therefore, quickly fostering advancements in the field of construction materials. A new generation of materials (bricks, cement, coatings, concrete, FRP, glass, masonry, mortars, nano-materials, PCM, polymers, steel, wood, etc.) is gaining a prominent position in modern building technology, since they can overcome various limits and flaws of conventional materials employed in constructions, without neglecting the smart applications of pioneering materials in ancient constructions and historic buildings. Even though the adoption of innovative materials in the construction field has been a successful route in achieving enhanced performance, or even new and unexpected characteristics, some issues have not been completely solved. On top of them, the cost/performance ratio of novel solutions, since their introduction must be convenient, without compromising quality. Other concerns are related to their sustainability, with eco-friendly options, possibly exploiting recycled materials or by-products from other productions, being the most desirable solution. Finally, the use of materials or systems that are unconventional in this field raises the need to update or develop new specifications and standards. This special issue aims at providing a platform for discussing open issues, challenges, and achievements related to innovative materials proposed for the construction industry.

isogrid --- aircraft load-bearing structures --- finite elements method --- nonlinear numerical analyses --- stability --- equilibrium path --- cement --- gypsum --- hydraulic lime --- mechanical properties --- mortars --- phase-change materials (PCM) --- sustainable materials for buildings --- thermal energy storage --- glass fiber-reinforced polymer (GFRP) rebar --- ultra-high-performance concrete (UHPC) --- concrete headed GFRP rebar --- bond strength --- development length --- flexural strength --- precast concrete deck --- material selection --- project performance --- material property --- analytic hierarchy process (AHP) --- building construction --- concrete system form --- phase change material (PCM) --- thermal energy storage (TES) --- thermal properties --- Ca7ZrAl6O18 --- 27Al MAS NMR --- Sr-rich (Sr,C)3AH6 --- cement hydration --- refractories --- immobilization of radioactive Sr --- shrinkage-reducing agent --- compressive strength --- splitting tensile strength --- freezing and thawing --- spacing factor --- cultural heritage --- durability --- mechanical characterization --- retrofitting --- strengthening --- quasi-brittle material --- three-point bending test --- energy fracture --- NHL --- composite material --- jute --- MICP --- ureolytic bacteria --- biocement --- natural plant fiber --- ladle furnace slag --- reclaimed asphalt pavements --- cold in-place recycling --- simple compressive strength --- bitumen emulsion --- waste --- circular economy --- bacteria --- biocementation --- construction --- microbially induced calcium carbonate precipitation --- n/a