CHARACTERIZATION OF TWO LOCALLY AVAILABLE FLY ASHES
FOR MAKING CONCRETE
29th Our World in Concrete and Structures (OWICs) - 2004
M. Akram Tahir*, UET, Lahore, Pakistan
M. Faisal Chaudhry, UET, Lahore, Pakistan
Chemical composition, fly ash, specific surface area, strength development.
The interim results of an ongoing research are reported where the suitability of two locally available fly ashes for making concretes is being investigated. One of the two ashes was collected from a power plant and the other from a soda ash plant. The fraction retained on Sieve #325, Blaine specific surface area, chemical composition and loss on ignition were determined in addition to the pozzolanic activity index. The two ashes have shown a wide difference in physical properties like fraction retained on Sieve # 325 and specific surface area, whereas the chemical composition of the two ashes was almost identical. The strength development of 12 concretes made from the combinations of two ashes with 3 cements was compared with otherwise
similar concretes incorporating a fly ash from Thai sources. The Thai ash has
exhibited superior strength development characteristics. The strength development of one of the two local ashes was excellent and that of the other was just satisfactory.