By E. Vazques
Chemical admixtures are used to change the houses and behavior of clean and hardened concrete. they allow extra monetary development and the fulfillment of particular homes comparable to excessive energy or toughness. This publication provides new examine details from a world RILEM Symposium on six major themes: workability, surroundings, energy, longevity, different houses and expertise.
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Additional info for Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5)
31 in the Rheological studies on fresh concrete using admixtures 45 case of concrete. Parts of the measured values of rheological constants for cement paste, mortar, and concrete are given in Tables 3 and 4. Table 3. Plastic viscosity and yield value of cement paste. 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.
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. A typical flow diagram of AE concrete under vibration is shown in Fig. 12. The flow curve under vibration could be represented by a power law equation as suggested by Tattersall, but a better agreement could be obtained when the curve was divided into two parts, and a straight line approximated to that for high shear rate range and exponential curve for low shear rate range by using consecutive four measured values as shown in Fig.
8. Dynamic modulus of various mortars 31 Admixtures for concrete 32 Fig. 9. Dynamic viscosity of various mortars The measured coefficient of attenuation, dynamic modulus of elasticity and dynamic viscosity of fresh mortars are summarized in Fig. 7, Fig. 8 and Fig. 9 respectively. It is obvious that the chemical admixture affects to the visco-elasticity factors. In this experiment, increase of dosage lead to decrease of visco-elasticity factors. That effect on water cement ratio was less than that of dosage of admixtures.
Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5) by E. Vazques