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https://hdl.handle.net/1822/16962
Título: | Mechanical performance and capillary water absorption of sewage sludge ash concrete (SSAC) |
Autor(es): | Jamshidi, M. Jamshidi, A. Merdadhi, N. Pacheco-Torgal, F. |
Palavras-chave: | Sewage sludge ash XRD TGA XRF Concrete compressive and flexural strength |
Data: | 2012 |
Editora: | Taylor and Francis |
Revista: | International Journal of Sustainable Engineering |
Resumo(s): | Disposal of sewage sludge from waste water treatment plants is a serious environmental problem of increasing magnitude. Waste water treatment generates as much as 70 g of dry solids per capita per day. Although one of the disposal solutions for this waste is through incineration, still almost 30% of sludge solids remain as ash. This paper presents results related to reuse of sewage sludge ash in concrete. The sludge was characterised for chemical composition (X-ray flourescence analysis), crystalline phases (X-ray diffraction analysis) and pozzolanic activity. The effects of incineration on crystal phases of the dry sludge were investigated. Two water/cement (W/C) ratios (0.55 and 0.45) and three sludge ash percentages (5%,10% and 20%) per cement mass were used as filler. The mechanical performance of sewage sludge ash concrete (SSAC) at different curing ages (3, 7, 28 and 90 days) was assessed by means of mechanical tests and capillary water absorption. Results show that sewage sludge ash leads to a reduction in density and mechanical strength and to an increase in capillary water absorption. Results also show that SSAC with 20% of sewage sludge ash and W/C=0.45 has a 28 day compressive strength of almost 30 MPa. SSAC with a sludge ash contents of 5% and 10% has the same capillary water absorption coefficient as the control concrete; as for the concrete mixtures with 20% sludge ash content, the capillary water absorption is higher but in line with C20/25 strength class concretes performance. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/16962 |
DOI: | 10.1080/19397038.2011.642020 |
ISSN: | 1939-7038 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | C-TAC - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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19397038.2011.642020.pdf | Principal | 209,05 kB | Adobe PDF | Ver/Abrir |