Download e-book for kindle: Admixtures for Concrete - Improvement of Properties: by E. Vazques

By E. Vazques

ISBN-10: 0203008758

ISBN-13: 9780203008751

ISBN-10: 0412374102

ISBN-13: 9780412374104

Chemical admixtures are used to switch the homes and behavior of clean and hardened concrete. they allow extra monetary building and the success of unique houses resembling excessive energy or sturdiness. This e-book offers new study details from a world RILEM Symposium on six major themes: workability, environment, energy, toughness, different homes and know-how.

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

Example text

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. 2. 1Pa·s, lgf/cm2=98Pa.

STEP 3 The reactive polymer is converted into soluble dispersant. STEP 4 The soluble dispersant is absorbed onto the surface of cement particles, enhances the surface potential energy and contributes to the stabilization of dispersion. In optimizing the reactive polymer for slump control, it is necessary to study the factors influencing the rate of conversion. The conversion appears to be a heterogeneous reaction occuring at the interface between a liquid phase and a solid polymer particle because the reactive polymer is insoluble in water.

2. Photo 1. Propagated wave forms Dynamic rheological properties of fresh concrete with chemical admixtures 27 Fig. 2. 1) Where ρ is density of material, V is velocity of propagation wave and f is frequency of wave. α is a coefficient of attenuation calculated from pulse amplitude I1, I2 (see Fig. 2) and propagation distance L. In the next step, the above measurement was carried out under vibration with sinusoidal wave motion. The frequency of vibrator was 200Hz. Measured propagated waves through concretes were processed to frequency spectrums by a signal processor.

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Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5) by E. Vazques

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