By E. Vazques
Chemical admixtures are used to change the homes and behavior of clean and hardened concrete. they allow extra monetary development and the fulfillment of certain houses resembling excessive power or toughness. This publication offers new learn details from a world RILEM Symposium on six major themes: workability, environment, power, sturdiness, different homes and expertise.
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Extra info for Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5)
As for admixtures, two kinds were used: a material for improving Table 1. Physical properties and gradations of aggregates. M. volume (%) 15~10mm. 10~5mm 1 Mix. 00 Rg. 20 Cs. 00 Rs. 5 finishability and a superplasticizer. The material for improving finishability was a polyol compound (Pozzolith. No. 100) and the superplasticizer a melamine sulfonate base compound (NP 20 ). 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.
Relationship between the water/cement ratio and drying shrinkage after six months. 5 Summary By using the new superplasticizer (Mighty 2000), properties of water reduced concrete have been investigated and the following information obtained. (1) By using the reactive polymer, it is confirmed that the slump of fresh concrete can be optionally controlled in all mix-designs. It has been considered very difficult to maintain the workability of a low water/cement ratio, but the concrete containing the reactive polymer has been found to be very useful for maintaining the initial slump of ready mixed concrete.
3 Dynamic rheometer Fresh concrete, mortar and paste can be assumed a viscoelasticity materials. 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.
Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5) by E. Vazques