Application of ultrasonic testing to describe the hydration of calcium aluminate cement at the early age

Chotard, Thierry; Gimet-Breart, N.; Smith, Agnès; Fargeot, D.; Bonnet, Jean-Pierre; Gault, C.

doi:10.1016/s0008-8846(00)00446-4

Cited by 121 publications

(43 citation statements)

References 17 publications

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“…Some authors (Reinhardt and Grosse, 2004;Chen et al, 2010) are convinced that the beginning of Stage 2 when the UPV transforms from a flat increase to a sharp one corresponds to the initial setting of cement pastes. Chotard et al (2001) states that the duration of its sharp increase corresponds to the cement stiffening process and that the beginning of Stage 3 is when the cement skeleton approaches its final stiffness, which is in accordance with results of Zhang (2009). Reinhardt and Grosse (2004), however, points out that the final setting is still under discussion and that a practical experience shows that the velocity of 1500 m/s could define it.…”

Section: Upv and Cement Hydrationsupporting

confidence: 90%

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Panzera¹,

Christofóro²,

Cota³

et al. 2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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Section: Upv and Cement Hydrationsupporting

confidence: 90%

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Panzera¹,

Christofóro²,

Cota³

et al. 2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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“…The basic principle of the wave transmission methods relies on the velocity of a wave propagated through a medium, which depends on its density and elastic properties. According to Chotard et al (2001) and Smith et al (2002), the velocity of the transmitted wave is sensitive to the formation of solid hydrates and therefore varies over time with the cement hydration and hardening process. In this method, a pulse is generated on one side of the sample, transmitted through the material and received on the opposite side of the sample.…”

Section: Pulse Velocity Methodsmentioning

confidence: 99%

Comparison Between Different Experimental Techniques for Stiffness Monitoring of Cement Pastes

Granja

Azenha

Sousa

et al. 2014

ACT

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In 2009, a new methodology for the continuous monitoring of E-modulus of cement-based materials since casting was proposed, under the designation EMM-ARM (E-modulus Measurement through Ambient Response Method). This methodology is a variant to classic resonant frequency methods that allows continuous stiffness monitoring from the instant of casting. After the encouraging results obtained in the first applications of EMM-ARM to cement pastes, the present paper gives continuity to previous developments, through validations with additional experimental methodologies and extension to thermal activation testing. At first, a comparison is performed between the results of EMM-ARM and those obtained through: pulse velocity methods (both ultrasonic contact probes and bender-extender elements), penetration resistance (Vicat needle) and cyclic compression on cylindrical specimens. Afterwards, the possibility of studying the activation energy of the stiffness evolution on tests conducted at 20ºC and 40ºC is explored.

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“…Water emits from cement rock in stages: 110 °C to 120 °C, 180 °C to 200 °C, 280 °C to 300 °C [5]. First of all, at up to 100 °C, free water is discharged, followed by CAH 10 dehydration at 120 °C and C 2 AH 8 dehydration at 200 °C, with dehydration of AH 3 at 300 °C in the end.…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Disintegration of Cement Concrete at High Temperatures

Jocius¹,

Skripkiūnas²

2016

Construction Science

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-Concrete is a composite material composed of a binder, aggregates, water and additives. Mixing of cement with water results in a number of chemical reactions known as cement hydration. Heating of concrete results in dehydration processes of cement minerals and new hydration products, which disintegrate the microstructure of concrete. This article reviews results of research conducted with Portland and alumina cement with conventional and refractory concrete aggregates. In civic buildings such common fillers as gravel, granite, dolomite or expanded clay are usually used. It is important to point out the differences between fillers because they constitute the majority of the concrete volume.

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Application of ultrasonic testing to describe the hydration of calcium aluminate cement at the early age

Cited by 121 publications

References 17 publications

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Comparison Between Different Experimental Techniques for Stiffness Monitoring of Cement Pastes

The Mechanism of Disintegration of Cement Concrete at High Temperatures

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