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A platform for research: civil engineering, architecture and urbanism
INVESTIGATION OF THE VISCOELASTIC PROPERTIES OF FRESH PORTLAND CEMENT PASTES WITH AN ULTRASONIC WAVE REFLECTION METHOD
Abstract This study will mainly focus on the viscoelastic properties of Portland cement pastes at very early age, namely before the initial setting time. A method, called ultrasonic wave reflection (UWR-) method, was used to detect the material properties of fresh cast cement pastes. In this technique, a fused quartz plate with a thickness of 10 mm was used as a buffer material that sited next to the cement paste. Two transducers with 2.25 MHz central frequency were coupled to the quartz plate. Ultrasonic shear waves were used in the measurement. Besides measuring the wave reflection coefficient at the quartz-paste interface, the phase shift of the incident and the reflected waves was also measured, which allows the separation of the elastic and viscous properties of a cement paste at very early age by observing the evolution of dynamic storage shear modulus (G’) and loss modulus (G”) with the hydration of cement. Three cement pastes with water/cement-ratios equal to 0.4, 0.5 and 0.6 cured under water at a constant temperature of 25°C were studied. It was found that the development trend of the storage and loss shear moduli were closely related to the hydration of cement particles.
INVESTIGATION OF THE VISCOELASTIC PROPERTIES OF FRESH PORTLAND CEMENT PASTES WITH AN ULTRASONIC WAVE REFLECTION METHOD
Abstract This study will mainly focus on the viscoelastic properties of Portland cement pastes at very early age, namely before the initial setting time. A method, called ultrasonic wave reflection (UWR-) method, was used to detect the material properties of fresh cast cement pastes. In this technique, a fused quartz plate with a thickness of 10 mm was used as a buffer material that sited next to the cement paste. Two transducers with 2.25 MHz central frequency were coupled to the quartz plate. Ultrasonic shear waves were used in the measurement. Besides measuring the wave reflection coefficient at the quartz-paste interface, the phase shift of the incident and the reflected waves was also measured, which allows the separation of the elastic and viscous properties of a cement paste at very early age by observing the evolution of dynamic storage shear modulus (G’) and loss modulus (G”) with the hydration of cement. Three cement pastes with water/cement-ratios equal to 0.4, 0.5 and 0.6 cured under water at a constant temperature of 25°C were studied. It was found that the development trend of the storage and loss shear moduli were closely related to the hydration of cement particles.
INVESTIGATION OF THE VISCOELASTIC PROPERTIES OF FRESH PORTLAND CEMENT PASTES WITH AN ULTRASONIC WAVE REFLECTION METHOD
Sun, Z. (author) / Shah, S. P. (author)
2006-01-01
7 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Conference Proceedings | 2006
Rheometric and ultrasonic investigations of viscoelastic properties of fresh Portland cement pastes
| Online Contents | 2006
Rheometric and ultrasonic investigations of viscoelastic properties of fresh Portland cement pastes
| British Library Online Contents | 2006
Rheology of fresh portland cement pastes
| Engineering Index Backfile | 1963