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Additional info for Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5)

Sample text

37 (Note) 1. Test values averages of 3 test results. 2. 1Pa·s, lgf/cm2=98Pa. 00) determined by Eq. 0%. On the other hand, in the cases of mortar and. concrete, the ratios of estimated values to measured values of the respective plastic viscosities calculated using Eq. 3% in the case of mortar with 312 samples. 8% with the number of samples 116. Accordingly, the plastic viscosities of cement paste, mortar, and concrete appear to be satisfactorily estimable using the proposed viscosity equations.

H. (1988) The effect of vibration on the rheological properties of fresh concrete, Magazine of Concrete Research, 40, 143, 79–89. Kakuta, S. and Akashi, T. (1983) Study on Physical Properties of Cement Paste and Mortar at Early Age by Ultrasonic Pulse Method, Journal of the Society of Materials Science, 32, 353, 175–181. Kakuta, S. and Kojima, T. (1989) Effect of Chemical Admixtures on the Rheology of Fresh Concrete, Proceedings of Third CANMET/ACI conference on Superplasticizers and Other Chemical Admixtures in Concrete.

Usually, the rheological properties can be obtained from the flow diagram. Although many investigators support that concrete may be a Bingham fluid, concrete under vibration is still unknown. Dynamic rheological properties of fresh concrete with chemical admixtures Fig. 12. Flow curves of various concretes under vibration Fig. 13. m/sec) is apparent coefficient of viscosity and q is apparent viscosity index. This equation gives an expression of non-Newtonian flow, namely pseudoplastic or quasiviscous flow.

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