951
4370.009
Osborne, Geoffrey J.
International Symposium on Structural Lightweight Aggregate Concrete, 1995 Proceedings
Paper
Norwegian Concrete Association
1995
June 20-24, 1995
590-603
Y
It shows that lightweight concretes containing pelletized blastfurnace slag aggregate and sintered pulverised fuel ash (PFA) aggregate are as durable as dense aggregate concrete following ten years of exposure in marine and soft acid water environments. The concretes were based on a series of prescribed mixes designed for the PFA aggregate concretes and the properties and performance of the lightweight aggregate concretes were compared with those of concretes made with dense gravel aggregates of similar mix design.The performance was assessed using concrete tests at ages up to 10 years which included measurements of carbonation, compressive strength, assessment of chemical attack and freeze-thaw resistance of 100 mm concrete cubes and at 15 years the effect of ingress of chloride on the corrosion of reinforcement in concrete prisms. These lightweight aggregate concretes were shown to exhibit very good long term durability with respect to these important chemical and physical properties and the advantages as compared with dense aggregate concretes are discussed. The results of these durability studies have provided important practical data which should assist specifiers in drafting new standards and updating existing British and European Standards and Codes of Practice in relation to the performance of lightweight aggregate concretes in aggressive environments.