Download Admixtures for Concrete - Improvement of Properties: by E. Vazques PDF

By E. Vazques

Chemical admixtures are used to change the houses and behavior of unpolluted and hardened concrete. they allow extra financial building and the success of detailed homes similar to excessive energy or toughness. This ebook provides new study info from a world RILEM Symposium on six major themes: workability, atmosphere, energy, sturdiness, 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)

Example text

10. Typical wave forms under vibration It is clear that the wave propagation was influenced by an acceleration of vibrator and a propagation distance. Fig. 11 shows the frequency spectrum of SP2 mortar. Its frequency of vibration was 200Hz and acceleration was 5g at vibrating plate. This figure shows the propagation wave is consisted of the second and the third component of resonance. Frequency spectrum of fresh mortar with chemical admixtures are listed in Table 4. The magnitude of spectrum has correlation with dynamic modulus of elasticity and dynamic viscosity.

25% by weight of cement. Rheological studies on fresh concrete using admixtures 41 3 Method of measuring rheological constants The particulars of the rotary internal cylinder viscometer used for concrete were radius and length of internal cylinder 15cm and 20cm, respectively, and radius of external cylinder 20cm. 5) was laid between the bottom of the internal cylinder and the bottom of the container, the concrete sample was then put in, and the flow velocity distribution of the sample was measured by the multi-point method, and thus the rheological constants were determined.

4 Admixtures for concrete 44 Fig. 2. Relationship between shape factor of solute and fineness modulus in fresh mortar. Max. size of coarse aggregate=20mm. 68. 60. Accordingly, the exponential term in Eq. 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.

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