Feasibility and performance of recycled aggregate in concrete containing fly ash for sustainable buildings

A judicious use of resources, achieved by the use of by-products and waste materials. and a lower environmental impact, achieved through reduced carbon dioxide emission and reduced natural aggregate extraction from quarries, represent two main actions that meet sustainable building development. Recycled-aggregate concrete containing fly ash is an example of a construction material which is in harmony with this concept, whereby sustainable building development is feasible with satisfactory performance in terms of both safety and serviceability of structures. The structural properties of recycled-aggregate concrete containing fly ash were evaluated by means of compression tests, splitting tension tests and pull-out bond tests on concrete specimens, whereas structure serviceability was checked by means of drying shrinkage. Moreover, corrosion measurements with galvanized steel embedded in natural-aggregate concrete containing fly ash were analyzed in order to expect the use of galvanized steel reinforcement in fly-ash recycled-aggregate concrete.