By E. Vazques
Chemical admixtures are used to switch the homes and behavior of clean and hardened concrete. they permit extra monetary building and the fulfillment of specific homes akin to excessive energy or toughness. This ebook offers new examine details from a global RILEM Symposium on six major themes: workability, atmosphere, energy, sturdiness, 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)
Frequency spectrum of superplasticized mortar under vibration Admixtures for concrete 34 Table 4. 3 Flow behavior of fresh concrete under vibration Fresh concrete is liquefied by vibration so that concrete behaves as a liquid within an effective range from vibrator. It is important to know the rheological properties of liquefied concrete because they give the capacity to hold aggregate particles and air bubbles under vibration. Rheological properties under vibration, therefore, give a prediction for the resistance to segregation, compactability and fluidity.
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. The transmitting set were comprised with a function generator, an amplifier and a vibrator. The receiving set was comprised by the sensors which resonance was 150kHz, signal processor (FFT analyzer) with video-printer and an oscilloscope. The locations of two sensors were 5cm (S1) and 15cm (S2) from the vibrating plate respectively.
Test values of rheological constants averages of 2 test results. 2. 002cP. 3. 01 P. 4. ηo: 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.
Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5) by E. Vazques