Abstract
The main objective of this study was to evaluate the use of construction and demolition waste (CDW) from the Passo Fundo region of Rio Grande do Sul (RS), Brazil, in the development of aerated foamed concrete. This waste had not yet been characterized or even reused. CDW was processed (sieved only), characterized, and used as an aggregate, completely substituting natural sand. The influence of CDW granulometry and the amount of foam upon compressive strength, wet and dry bulk density, water absorption, and the air voids of concrete blocks were determined. Results showed that CDW has regular characteristics for the development of aerated foamed concrete. Compressive strength and density decreased as the amount of foam increased, while water absorption and air voids also increased. Also, CDW that was classified as coarse showed higher compressive strength. On average, CDW medium-sized particles had a higher air void content, while water absorption showed little variation with respect to granulometry. CDW residue from the region of study can be used as aggregate for the development of aerated foamed concrete. However, it must characterized before being used to guarantee the quality of the final product.
Highlights
Construction and demolition waste (CDW) has been used significantly since World War II due of the great amount of debris and the need to satisfy the great demand for construction materials [1,2].The use of construction and demolition waste (CDW) as aggregate for the development of concrete has been an alternative to reduce environmental and economic impacts through the preservation of natural resources, because the global demand for construction quality aggregates is expected to be more than 51 billion metric tons by2019 [3]
Three different CDW granulometries were used in the production of foamed concrete blocks: coarse, medium, and fine
CDW residue was characterized for granulometry, specific mass, swelling, and by X-ray
Summary
Construction and demolition waste (CDW) has been used significantly since World War II due of the great amount of debris and the need to satisfy the great demand for construction materials [1,2].The use of CDW as aggregate for the development of concrete has been an alternative to reduce environmental and economic impacts through the preservation of natural resources, because the global demand for construction quality aggregates is expected to be more than 51 billion metric tons by2019 [3]. Construction and demolition waste (CDW) has been used significantly since World War II due of the great amount of debris and the need to satisfy the great demand for construction materials [1,2]. The use of CDW as aggregate for the development of concrete has been an alternative to reduce environmental and economic impacts through the preservation of natural resources, because the global demand for construction quality aggregates is expected to be more than 51 billion metric tons by. In European Union countries, approximately 50% of the total generated volume of CDW is reused, and. 70% of total CDW should be recycled by 2020 [4].
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