Akademik Veri Yönetim Sistemi
International Conference on Concrete Construction, London, Kanada, 9 - 10 Eylül 2008, ss.251-261
The study presents the effects of aggregate characteristics on the lightweight fly ash aggregate concrete (LWAC) properties. The influence of characteristics of four aggregate types (two sintered lightweight fly ash aggregates, cold-bonded lightweight fly ash aggregate and normalweight crushed limestone aggregate) such as strength, microstructure, porosity, water absorption, bulk density and specific gravity on the behaviour of concrete mixtures were discussed. The results of this study revealed the achievement of manufacturing high-strength air-entrained lightweight aggregate concretes using sintered and cold-bonded fly ash aggregates. In order to reach target slump and air content, less amount of chemical admixtures was used in lightweight concretes than in normalweight concrete, leading to reduction in production cost. The use of lightweight aggregates (LWA) instead of normalweight aggregates in concrete production slightly decreased the strength. As it was expected, the lightweight aggregate concretes had lower compressive strength and modulus of elasticity values than the normal weight concrete due to the higher porosity and lower strength of the aggregate included in the concrete. The models given by codes, standards and software and equation derived in this study gave close estimated values to the experimental results.