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A platform for research: civil engineering, architecture and urbanism
Monitoring the setting times and strength gain of mortar using ultrasonic guided waves
A guided wave approach that characterises the setting and hardening of early age mortar during the first twentyfour hours of hydration is presented. Using a throughtransmission system, the method measures the energy leakage of the fundamental torsional wave mode from a cylindrical steel rod to the surrounding mortar. The evolution of the mortar properties are related to the energy leakage or attenuation of the guided wave. The study shows that the technique is useful for monitoring the strength development and the microstructure of varying water-cement ratios. Experimental results show that the fundamental torsional mode can be used to evaluate various properties of early age mortar during the first twenty-four hours of hydration. The attenuation of the waveform over time gives insight into the microstructure and strength development of the mortar. The low w/c mixture exhibited rapid strength gain and a tightly bound microstructure that is illustrated by the immediate decay in the waveform and the high attenuation of the mortar after twenty-four hours. The attenuation characteristics of the guided wave also reflect the effects that accelerant, retardant, and fly ash have upon the mortar. The physical characteristics of the silica fume caused the guided wave method to overestimate the strength of the surrounding mortar and underestimate the final set. With the exception of the silica fume mortar, the waveguide method can reasonably estimate the strength and setting time of the mortar surrounding the steel rod.
Monitoring the setting times and strength gain of mortar using ultrasonic guided waves
A guided wave approach that characterises the setting and hardening of early age mortar during the first twentyfour hours of hydration is presented. Using a throughtransmission system, the method measures the energy leakage of the fundamental torsional wave mode from a cylindrical steel rod to the surrounding mortar. The evolution of the mortar properties are related to the energy leakage or attenuation of the guided wave. The study shows that the technique is useful for monitoring the strength development and the microstructure of varying water-cement ratios. Experimental results show that the fundamental torsional mode can be used to evaluate various properties of early age mortar during the first twenty-four hours of hydration. The attenuation of the waveform over time gives insight into the microstructure and strength development of the mortar. The low w/c mixture exhibited rapid strength gain and a tightly bound microstructure that is illustrated by the immediate decay in the waveform and the high attenuation of the mortar after twenty-four hours. The attenuation characteristics of the guided wave also reflect the effects that accelerant, retardant, and fly ash have upon the mortar. The physical characteristics of the silica fume caused the guided wave method to overestimate the strength of the surrounding mortar and underestimate the final set. With the exception of the silica fume mortar, the waveguide method can reasonably estimate the strength and setting time of the mortar surrounding the steel rod.
Monitoring the setting times and strength gain of mortar using ultrasonic guided waves
Überwachung der Abbindezeit und Festigkeitszunahme von Mörtel mit geführten Ultraschallwellen
Borgerson, J.L. (author) / Reis, H. (author)
Insight ; 48 ; 670-676
2006
7 Seiten, 13 Bilder, 2 Tabellen, 33 Quellen
Article (Journal)
English
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