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Rheological properties of alkaline activated fly ash used in jet grouting appli...
Cristelo, Nuno; Soares, Edgar; Rosa, Ivo; Miranda, Tiago F. S.; Oliveira, Daniel V.; Silva, Rui André Martins da; Chaves, Ana Margarida Vaz AlvesThe 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 o...
Rammed earth construction with granitic residual soils : the case study of nort...
Silva, Rui André Martins da; Oliveira, Daniel V.; Miranda, Tiago F. S.; Cristelo, Nuno; Escobar, Maria C.; Soares, EdgarBuilding in unstabilised rammed earth results in low environmental impact. However, northern Portugal has not historical tradition with this technique, and thus the suitability of the local granitic residual soils is unknown. This paper presents an experimental investigation, where this possibility is assessed. The results showed that these soils are unsuitable, and that rammed earth construction is only feasib...
Soil stabilisation using alkaline activation of fly ash for self-compacting ram...
Cristelo, Nuno; Glendinning, Stephanie; Miranda, Tiago F. S.; Oliveira, Daniel V.; Silva, Rui André Martins daThis paper studies the effectiveness of alkaline activation of low-calcium fly ash on the improvement of residual granitic soils to be used on rammed-earth construction. Different liquid:solid ratios, alkali concentrations and Na2O : ash ratios were tested. Effect of calcium hidroxide, sodium chloride and concrete superplasticiser is also reported. Compressive strength up to 7 days at 60ºC was determined. Resul...
Rammed earth : feasibility of a global concept applied locally
Silva, Rui André Martins da; Oliveira, Daniel V.; Miranda, Tiago F. S.; Escobar, Maria C.; Cristelo, NunoRammed earth is an ancient building technique that has been continuously reinvented in the dynamic movement of people all over the world, where it has been used to build from dwellings to enormous fortresses and city walls. In the particular case of Portugal, the inhabitants have been closely related to earth construction. From one region to another, rammed earth, adobe and wattle-and-daub buildings are frequen...
Estabilização de solos residuais graníticos através da adição de cal
Cristelo, NunoA correcta estabilização dos solos de fundação constitui um aspecto cada vez mais importante no panorama actual da construção. De facto, a preocupação com o ambiente assume proporções cada vez maiores, existindo hoje em dia a clara consciência de que todos os esforços devem ser feitos no sentido de minorar os estragos ambientais causados pelo desenvolvimento das mais variadas infra-estruturas. Nessa óptica, é u...
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