By E. Vazques
Chemical admixtures are used to change the houses and behavior of unpolluted and hardened concrete. they allow extra fiscal building and the fulfillment of unique houses resembling excessive energy or toughness. This publication offers new study info from a global RILEM Symposium on six major subject matters: workability, atmosphere, power, toughness, different houses and know-how.
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Extra info for Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5)
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.
6. Relationship between the water/cement ratio and the carbonation. Fig. 7. Relationship between the water/cement ratio and the permeability. Slump control and properties of concrete with a new superplasticizer. I 21 Fig. 8. Relationship between the water/cement ratio and drying shrinkage after six months. 5 Summary By using the new superplasticizer (Mighty 2000), properties of water reduced concrete have been investigated and the following information obtained. (1) By using the reactive polymer, it is confirmed that the slump of fresh concrete can be optionally controlled in all mix-designs.
Mix proportions Concrete and mortar type Plain concrete W/C=50%, s/a=48%, W=190, 200, 210 and 218 kg/m3 Slump…............. 25%/C by weight, W=210 and 218 kg/m3. 0%/C by weight. 3 Dynamic rheometer Fresh concrete, mortar and paste can be assumed a viscoelasticity materials. A dynamic rheometer for fresh concrete was tried to design in this experiment. Test set up is shown In Fig. 1. Fig. 1. Pulse wave propagation rheometer Admixtures for concrete 26 This rheometer was composed of the transmitting set, and the receiving set.