Production of lightweight aggregates from construction and demolition wastes in Vietnam
The reuse and recycle of construction and demolition waste (CDW) in construction industry is a sustainable trend in development, which helps to solve the environmental pollution issues and produces effective building materials, among which the production of lightweight aggregates (LWA) for concrete is a new and promising direction. This paper presents a research on using CDW of a combination of clay-fired brick and mortar from masonry to make LWA for concrete. Experimental results have shown that ground brick and mortar with a size of less than 100 µm, mixing with expanding agent, pelletized to size less than 10 mm, then dried and burned to temperature up to 1250oC can make the product of LWA with density less than 800 kg/m3, which can later be used as aggregates for making lightweight aggregate concrete.Keywords:
construction and demolition wastes; mortar; brick; lightweight aggregate; burning.
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