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

By E. Vazques

ISBN-10: 0203008758

ISBN-13: 9780203008751

ISBN-10: 0412374102

ISBN-13: 9780412374104

Chemical admixtures are used to change the homes and behavior of clean and hardened concrete. they allow extra fiscal building and the fulfillment of specific houses akin to excessive energy or toughness. This publication offers new study details from a world RILEM Symposium on six major themes: workability, surroundings, power, toughness, different homes and expertise.

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

Sample text

O: Estimated plastic viscosity of solvent (cement paste or mortar) (P). 5. *: J-funnel flow time(s). 6. **: Specific gravity. 7. ***: Case of using fine aggregate No. 12 in Table 1. 600 5 Basic properties of superplasticized concrete and estimation of plastic viscosity Superplasticized concrete has been extensively used recently for the purpose of improving placeability and quality of concrete, but there has been little research done concerning its rheological properties. The relationships between slump loss and rheological constants, the transitions in rheological constants and strength properties accompanying slump increments, and further, a method of estimating plastic viscosity of superplasticized concrete using a viscosity equation are discussed in this chapter.

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. 3% in the case of mortar with 312 samples. 8% with the number of samples 116. Accordingly, the plastic viscosities of cement paste, mortar, and concrete appear to be satisfactorily estimable using the proposed viscosity equations.

It is possible to control the slump by using the new superplasticizer in all mix-designs, this enables us to deal with high strength concrete easily, and the new superplasticizer is expected to contribute to the increased use of high strength concrete. 4 shows the results of compressive strength. 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%.

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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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