Continuous monitoring of setting and hardening of mortar and concrete

Reinhardt, Hans‐Wolf; Große, Christian U.

doi:10.1016/j.conbuildmat.2003.10.002

Cited by 231 publications

(113 citation statements)

References 2 publications

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“…Practical experience showed that the final setting time could be defined by an ultrasound velocity of 1500 m/s [5]. Our data confirm this statement, since for the reference mix with ordinary Portland cement (I-0) an ultrasound velocity of 1500 m/s was reached after 355 min which corresponds well with the setting period of 6 to 7 h, mentioned by [23].…”

Section: Discussionsupporting

confidence: 88%

“…During the last decade other non-destructive techniques have attracted attention for the characterisation of the behaviour of concrete at early age. Among these, ultrasonic pulse velocity measurements permit to continuously follow microstructure development in concrete and mortar at early age [4,5,6,7,8]. The ultrasonic pulse velocity measurements are related to the development of the modulus of elasticity and the Poisson ratio.…”

Section: Motivementioning

confidence: 99%

“…The ultrasound device used for the current investigations was the FreshCon developed at the University of Stuttgart and described in more detail in earlier publications (among others [10,5,11,12]). The container consists of two polymethacrylate (PMMA) walls which are tied together with four screws with spacers ( Fig.…”

Section: Principle and Devicementioning

confidence: 99%

“…An offline version of the software allows reevaluating the data after the test, using different algorithms for picking the onset times of the signals. Reinhardt and Grosse [5] determined that, between repetitions, measured velocities vary only by approximately 1%.…”

Section: Fig 1 View Of the Freshcon Mortar Containermentioning

confidence: 99%

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On-line monitoring of setting and hardening of concrete

Reinhardt¹

2006

2nd International RILEM Symposium on Advances in Concrete Through Science and Engineering

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SummaryThe paper deals with the ultrasonic transmission method to determine setting and hardening of cementitious materials. A testing device is described. An important feature of the method is the automatic signal evaluation. To this end, the continuous wavelet transform has been applied. Measurements on mortar with shotcrete accelerator demontrate the applicability of the method. Results are discussed. Further research needs are outlined.

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Section: Discussionsupporting

confidence: 88%

Section: Motivementioning

confidence: 99%

Section: Principle and Devicementioning

confidence: 99%

Section: Fig 1 View Of the Freshcon Mortar Containermentioning

confidence: 99%

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On-line monitoring of setting and hardening of concrete

Reinhardt¹

2006

2nd International RILEM Symposium on Advances in Concrete Through Science and Engineering

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“…More recently, NDT (non destructive testing) ultrasonic devices, previously developed for damage detection and crack identification, have been used to monitor the transition from fluid to solid and the change in stiffness of early age concrete. One example is the Freshcon system developed at the University of Stuttgart [1,2] which is represented on Figure 1. It consists in a specific mold (for concrete or mortar) equipped with two piezoeletric transducers (one transmitter and one receiver).…”

Section: Introductionmentioning

confidence: 99%

Monitoring of the ultrasonicP-wave velocity in early-age concrete using Smart Aggregates

Dumoulin

Karaiskos

Carette

et al. 2012

MATEC Web of Conferences

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Abstract. This paper deals with the use of embedded piezoelectric transducers to monitor the ultrasonic Pwave velocity evolution during the setting and hardening phases of concrete since casting time. The main advantage of the technique is the ability to overcome the limitations of traditional methods which do not allow to apply specific mechanical boundary conditions during the measurement. The embedded transducers are based on the "Smart Aggregates" concept previously developed at the University of Houston, Texas. Two piezoelectric transducers are embedded in a prismatic mold and the evolution of the P-wave velocity is recorded for the first 24 hours in concrete after casting time. The results are very promising and show a good agreement with classical ultrasonic tests using external transducers.

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Echo‐Verfahren in der Zerstörungsfreien Zustandsuntersuchung von Betonbauteilen

Reinhardt¹

2006

Beton‐Kalender 2007

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Continuous monitoring of setting and hardening of mortar and concrete

Cited by 231 publications

References 2 publications

On-line monitoring of setting and hardening of concrete

On-line monitoring of setting and hardening of concrete

Monitoring of the ultrasonicP-wave velocity in early-age concrete using Smart Aggregates

Echo‐Verfahren in der Zerstörungsfreien Zustandsuntersuchung von Betonbauteilen

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