Non-destructive testing by ultrasounds has been widely used to characterize cementitious materials. Ultrasonic techniques allow estimating mechanical properties of these materials by measuring both velocity and attenuation of the propagating ultrasonic pulse. In this study, both content and size of aggregates in mortar specimens are estimated by taking into account an optimization formulation w...

This study investigates the different types of ultrasonic inspection, when applied to assess the impact damage in Carbon Fiber Reinforced Plastic CFRP laminates. The study surveys the two most used ultrasonic testing approaches first; namely the pulse-echo and the through-transmission modes. Then, the manuscript discusses and analyzes the enhanced ultrasonic testing methods that use the polar s...

This study investigates the method of ultrasonic pulse velocity technique as a non-destructive test for concrete to estimate mechanical properties RPC, modified reactive powders (MRPC). is based on data obtained from experimental investigation done in this work and comparison with previous works. After conducting tests cubic samples, relationship between velocity, elastic modulus compressive st...

This work aims to study the relationship between compression resistance and velocity from ultrasonic pulses in samples of mortars with 25% pozzolanic content. Pozzolanic cement is a low-priced sustainable material that can reduce costs CO2 emissions are produced manufacturing calcination calcium carbonate. Using pulse (UPV) estimate compressive content reduces when evaluating quality structures...

Ultrasonic gas flowmeters typically use narrowband piezoelectric transducer arrangements for interrogating the flow of gas in a pipe. In this work, the suitability of broadband electrostatic transducers operating at frequencies of up to 1 MHz for ultrasonic measurement of gas flow has been investigated. The transit time method of ultrasonic gas flow measurement was adopted and experiments were ...

The objective of this research is to study the effects produced by ternary binders which combine addition waste brick powder with fly ash, limestone, ground granulated blast furnace slag or glass in microstructure and mechanical properties mortars. In these binders, ordinary Portland cement was partially replaced 10% another abovementioned additions. Mortars prepared without additions were also...

This study investigates the feasibility of application ultrasonic measurement to characterize Steel-Fiber-Reinforced Concrete (SFRC). Specifically, effects steel fiber content, age, moisture and orientation on Ultrasonic-Pulse-Velocity (UPV) were investigated. In this regard, beam cylindrical samples fabricated with different contents. The result indicated that for specimens UPV increases addit...

Among all the concrete characteristics, compressive strength is known as most important feature and therefore, it often utilized to quantify quality of concretes. The assessment concretes in existing constructions during their service life. Thus, addition destructive evaluation strength, many non-destructive techniques have been adopted assess strength. Ultrasonic Pulse Velocity (UPV) one that ...

Durability of concrete structure in marine environments is a big issue for many decades due to chloride attack. Chloride penetrates the concrete structure and accelerates the corrosion process of reinforcement which decreases the life of those structures. Also shrinkage cracks in concrete play main role for chloride penetration through concrete surface.  Many researchers tried to find easy and ...