ASSESSMENT OF THE ASR EXPANSION OF CONCRETE MADE WITH RECYCLED CONCRETE AGGREGATES

The amount of construction and demolition waste is increasing all over the world. Most of this waste consists of concrete and masonry. These waste materials are very suitable to be recycled. After carrying out an advanced recycling procedure, it’s possible to produce highquality recycled aggregates. Until now, most of these aggregates are used in low grade application as in road foundations. In Flanders, where the market in road works is now almost saturated, using more recycled concrete aggregates in structural concrete could provide the answer for the growing stock. Another advantage is that less natural aggregates, which are finite in quantity, have to be obtained from quarries or seaand riverbeds. This is both costsaving and environment-friendly. Before this relatively new application can be fully implemented, the behaviour and characteristics of recycling concrete aggregates have to be known. Some uncertainties hinder the large scale use of recycled concrete aggregates in structural concrete. One frequently claimed uncertainty is the possible alkali-silica reaction. This paper discusses the results of an investigation on the alkali-silica expansion of recycling concrete with different replacement rates of recycled aggregates and different types of cement. In this study, only recycled concrete aggregate is investigated as recycled aggregate. Both coarse and fine recycled concrete aggregates are examined. The results are also compared with other studies.