By E. Vazques
Chemical admixtures are used to change the houses and behavior of unpolluted and hardened concrete. they allow extra fiscal building and the fulfillment of exact homes corresponding to excessive energy or toughness. This e-book provides new learn info from a world RILEM Symposium on six major themes: workability, atmosphere, power, toughness, different houses and expertise.
Read or Download Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5) PDF
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Additional resources for Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5)
Admixtures for concrete 16 Table 2. Mix designs Water/ Dosage of admixture (% Unit weight (kg/m3) wt. cement) Fine Course cement ratio (%) SP RA AE Cement Water agg. agg. 4 Testing method The materials were poured into a slant drum mixer in the following sequence; gravel, half the amount of sand, cement, the rest of the sand and finally water. This was mixed for 3 minutes. After the measurement of initial slump and air content, concretes were agitated at 4 rpm for 60 minutes and the slump measurements were carried out at 30 minute intervals.
93) Coarse agg. 2 New superplasticizer (Mighty 2000) Our newly developed Mighty 2000 has two effective functions for slump control and dispersant. As a slump control composition, dispersant precursor is converted to the water soluble dispersant by reacting with the strong alkaline materials in concrete. On the other hand, β-naphtalene sulfonate-formaldehyde high condensate was used as a dispersing composition. Thus, Mighty 2000 greatly offers to reduce water content and decrease slump loss. 3 Concrete mix designs The mix designs of concrete are shown in Table 2.
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. The container was made of a wood which dimensions were 20cm (height), 30cm (transverse) and 45cm (longitudinal).
Admixtures for Concrete - Improvement of Properties: Proceedings of the International RILEM Symposium (RILEM Proceedings 5) by E. Vazques