Abstract
It is important to manage the disposal of construction and demolition wastes in an economical and environmentally friendly way. Reuse of recycled materials generated from construction and demolition wastes to produce ‘green’ construction materials is a promising area. Recycled powder can be produced from abandoned clay bricks or concrete. The chemical compositions and physical properties of the recycled powder are first studied by a series of tests, including scanning electron microscopy and X-ray diffraction analysis. An experimental programme is designed to investigate the mechanisms by which the recycled powder contributes to the strength of cementitious composites. It is found that the strength contribution of recycled powder is by means of a micro-aggregate effect, hydration and pozzolanic activity. The hydration activity of recycled powder contributes mainly to the early strength, and pozzolanic activity to the strength at a later stage. To promote the pozzolanic activity of recycled powder, different chemical activators are investigated. Two chemical activators are selected and their effect on the pozzolanic activity of recycled powder is verified.
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