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Rheometric and ultrasonic investigations of viscoelastic properties of fresh Portland cement pastes |
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| Authors: | Zhihui Sun Thomas Voigt |
| Affiliation: | a 112 W.S. Speed Hall, Department of Civil and Environmental Engineering, University of Louisville, Louisville, KY 40292, USA b USG Corporation, Research and Technology Center, 700 North Highway 45, Libertyville, IL 60048, USA c Center for Advanced Cement-Based Materials, Northwestern University, 2145 Sheridan Road, Suite A130, Evanston, IL 60208, USA |
| Abstract: | The paper investigates the possibility of using a shear wave reflection technique to monitor the viscoelastic behavior (represented by storage shear modulus and viscosity) of Portland cement paste at very early age. 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. By measuring the wave reflection coefficients and the phase angles of reflected ultrasonic waves, the dynamic storage shear moduli and the viscosity of the cement paste can be calculated. The calculated results of the storage modulus were compared with the results obtained directly from the oscillatory rheometric measurement. In addition, the viscosity calculated from the wave reflection measurements was compared with results obtained directly from the step rheometric method and a qualitative agreement was found. The results show that as a non-destructive method, the ultrasonic wave reflection method provides useful information about both the elastic and viscous behavior of cement pastes at very early age. |
| Keywords: | Viscoelastic behavior Ultrasonic wave reflection coefficient Oscillatory rheology Storage modulus Viscosity |
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