By E. Vazques
Chemical admixtures are used to switch the houses and behavior of unpolluted and hardened concrete. they allow extra fiscal development and the success of certain homes resembling excessive energy or longevity. This booklet offers new study details from a global RILEM Symposium on six major issues: workability, surroundings, power, longevity, different homes and know-how.
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Additional info for Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5)
In this case, a pore water pressure were raised as the pore of concrete were filled with liquefied mortar. On the other hand, the excess pore water of high slump concrete Increased only a little because this type concrete already liquefied without vibration. Decrease of viscosity of concrete by vibration induce sedimentation of particles and the pore water moves upward to surface of concrete. Fig. 14 shows the differences of water pressure between surface and inner concrete indicating that the hydraulic gradient was occurred by vibration.
In all mix-designs, there was a significant relationship between the cement/water ratio and the compressive strength. Compressive strength of 1026kg/cm2 at 91 days was obtained using a water/cement ratio of 25%. 5 shows the relationship between the relative dynamic modulus of elasticity and the freezing-thawing cycle. The result of freezing-thawing resistance by using the new superplasticizer ensured durable concrete to 300 cycles. 6 shows the result of the carbonation of concrete. The rate of carbonation was restricted with the decrease of a water/cement ratio.
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.