Durability Of Concrete With Recycled Aggregates - Results Of Dutch Laboratory And Pilot Tests
Original hosted in "MACE", contributed by Social Updater
Recycled aggregates are applied increasingly in many European countries, Japan, and locally elsewhere around the world, notably in densely populated regions. They are obtained from the processing of stony construction and demolition waste. It is estimated that in Europe alone, at least about 200-300 million tonnes of building and demolition waste is currently land filled or applied in road construction. However, recycled aggregates may also be applied as aggregate in concrete, thereby upgrading its application. Concrete's, containing up to 100% fine and coarse aggregates may be utilised successfully. Significant savings on primary aggregates (in the order of 20-25%) may be obtained, thereby contributing to an improved sustainable raw materials use and exploitation, and providing a first step towards the eventual strive for a "closure" of the concrete life cycle loop. Introduction of "new" raw materials in the building industry is only possible when there is no discussion on aspects such as the product quality and the ratio between price and performance. Therefore, this paper will give attention to results obtained in the mixture proportions of concrete with recycled aggregates, strength, durability as well as environmental performance. It will be shown that for the most common ordinary concrete's durability is not a topic of much concern, based on results of tests on creep behaviour, chloride-ion ingress, sea water resistance and freezing and thawing resistance.