STRENGTH DEVELOPMENT OF FLY ASH CONCRETE DRIED AT EARLY AGES | |
| Conference | 30th Our World in Concrete and Structures (OWICs) - 2005 |
| Authors | M. Akram Tahir*, UET, Lahore, Pakistan Ammara Nusrat, UET, Lahore, Pakistan |
| Handle | 100030016 |
| Key Words | Curing, fly ash, strength development. |
| Abstract | An experimental study was conducted to determine the optimum curing time for fly ash concretes. A single high calcium ash was utilized with an ordinary Portland cement to cast three different concretes. The fly ash–binder ratio of 0.25 was combined with water-binder ratios of 0.45, 0.55 and 0.65. The compressive strengths of control specimen were determined after moist curing of 3, 7, 14, 28, 45, 90, 135 and 180 days. The curing was stopped at 4 different ages for the four groups; group one at 7 days, group two at 14 days, group three at 28 days and group four at 45 days. For the first group compressive strengths were determined at 14, 28, 90 and 180 days, for the second group at 28, 90 and 180 days, for the third and fourth groups at 90, 135 and 180 days. The first and second group concretes showed some reasonable strength development after the stoppage of curing where as the third and fourth group concretes did not show any appreciable increase in strength with time. The higher was the water-binder ratio, the more pronounced was the strength increase with time for dried concretes. At least fourteen day curing was recommended for the fly ash used in this study. |
| Full Text |  100030016 |
| Link to this page | www.cipremier.com/100030016 |
