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https://hdl.handle.net/1822/26723
Título: | Rheological properties of alkaline activated fly ash used in jet grouting applications |
Autor(es): | Cristelo, Nuno Soares, Edgar Rosa, Ivo Miranda, Tiago F. S. Oliveira, Daniel V. Silva, Rui André Martins Chaves, Ana Margarida Vaz Alves |
Palavras-chave: | Fly ash Alkaline activation Rheology Jet grouting Soil stabilisation |
Data: | 2013 |
Editora: | Elsevier 1 |
Revista: | Construction and Building Materials |
Citação: | Cristelo, N.; Soares, E.; Rosa, I.; Miranda, T.; Oliveira, D.; Silva, R.; Chaves, A. (2013). “Rheological Properties of Alkaline Activated Fly Ash used in Jet Grouting Applications.” Construction and Building Materials, Volume 48, 2013, Pages, 925-933. |
Resumo(s): | The application of alkaline activated fly ash to soil stabilisation has been recently studied, and although the structural behaviour was adequate, some concerns were raised regarding its apparent viscosity, which proved to be an important issue in jet grouting applications. Therefore, this paper deals with the experimental study of rheology of alkaline activated fly ash-based grouts, namely with: setting time of the freshly mixed grout; fluidity; capillary absorption; shrinkage and expansion behaviour; mass variation during the curing process and density. In order to establish some correlation points with structural performance, uniaxial compression strength (UCS) at 28 days curing was also determined. Six different grout compositions, defined based on Na2O (alkali)/ash and activator / ash ratios, were analysed. The activator was composed of sodium silicate and two different sodium hydroxide concentrations: 10.0 and 12.5 molal. Results show that the fluidity of the grouts correlate very well with UCS, with an increase of the former resulting in a decrease in the latter, which is a concern in jet grouting applications since this parameter controls the velocity of the grout at the nozzle and the soil/grout mixing capability. In terms of porosity, this type of material seems to be less porous than cement-based grouts. However, drying shrinkage values obtained were in general higher than usual for concrete, which is in accordance with results obtained by other researchers. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/26723 |
DOI: | 10.1016/j.conbuildmat.2013.07.063 |
ISSN: | 0950-0618 |
Versão da editora: | http://www.sciencedirect.com/science/article/pii/S0950061813006776 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | ISISE - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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CONBUILDMAT-D-13-00698R1a.pdf | Documento principal | 1,21 MB | Adobe PDF | Ver/Abrir |