In France, the policy of managing waste as part of sustainable development is driving research into ways to recover, recycle and reuse waste. Roads consume large volumes of material and provide opportunities which the road construction industry has explored. This paper presents the experience of a roadworks company with the use of household waste bottom ash. The document presents the potential benefits of this technique and then discusses: - Geotechnical and environmental characteristics of household waste bottom ash, - Problems encountered in some ten years of experience, - Ways to improve the material geotechnically and environmentally through treatment with hydraulic or bituminous binders. In conclusion, the paper presents a range of materials made with household waste bottom ash and lists their uses. These are: - Processed and calibrated bottom ash aggregate, used as fill or as a pavement sub-base, - Bottom ash treated with hydraulic binder for use in sub-base and lower base courses, - Bottom ash treated with foamed bitumen for use in base courses, and finally, - Bottom ash based concretes with specific applications in drainage trench filling and pavement widening. For the covering abstract see ITRD E135448.
Abstract