Encontrados 13 documentos, a visualizar página 1 de 2
Repair of earth constructions by means of grout injection
Silva, Rui André Martins daTese de doutoramento em Engenharia Civil (Área do conhecimento estruturas) ; Nowadays, one fourth of the World’s population lives in a house made from earth. Consequently, there is a large built stock widely distributed around the World going much beyond simple dwellings. An important part of the earth built stock is found often affected by cracking, whose repair is fundamental for the reestablishment...
Experimental investigation on the repair of rammed earth by means of injection ...
Silva, Rui André Martins da; Oliveira, Daniel V.; Schueremans, Luc; Lourenço, Paulo B.; Miranda, Tiago F. S.This paper assesses the adhesion capacity of unmodified mud grouts used to repair structural cracks on medium and large scale rammed earth specimens. Beam and wallet-specimens were manufactured using a soil from Alentejo (Portugal), whose particle size distribution had to be first corrected due to its high clay content. An “artificial” (composed by kaolin and limestone powder) and a “natural” (composed by sieve...
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...
On the development of unmodified mud grouts for repairing earth constructions: ...
Silva, Rui André Martins da; Schueremans, Luc; Oliveira, Daniel V.; Dekoning, K.; Gyssels, T.The conservation and rehabilitation of several sites of cultural heritage and of the large housing stock built from earth requires the development of techniques and materials compatible with this kind of construction. Grout injection is one repair solution which has been put forward over the last few years, whereas there is preference for employing grouts that incorporate earth in their composition. However, kn...
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...
Construir em terra ainda faz sentido?
Oliveira, Daniel V.; Silva, Rui André Martins daDevido à sua abundância e facilidade de utilização, a terra é um dos materiais de construção mais antigos usados pelo Homem, facto comprovado por evidências arqueológicas que sugerem a existência de cidades milenares construídas em terra como Jericó (Israel), Çatal Huyuk (Turquia), Harappa (Paquistão) e Akhlet-Aton (Egipto), entre outras.
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...
Residual granitic soil improvement for rammed earth construction
Cristelo, R.; Roma, R.; Fernandes, L.; Miranda, Tiago F. S.; Oliveira, Daniel V.; Silva, Rui André Martins daThis paper describes the research developed to evaluate the performance of stabilised residual granitic soil from the north region of Portugal. It is part of a research project designed to investigate the possibility of using this soil for rammed earth construction. Since its reduced plasticity makes the use of lime less effective, and the increasing environmental concerns with cement production can no longer b...
Strengthening of three-leaf stone masonry walls : an experimental research
Oliveira, Daniel V.; Silva, Rui André Martins da; Garbin, Enrico; Lourenço, Paulo B.The paper summarizes the results of an experimental research carried out on three-leaf masonry walls of typical granite stone constructions from the North of Portugal. The research aimed at studying the behaviour under compression of this wall typology, as well as the improvements introduced by common strengthening techniques applied for the structural rehabilitation of masonry heritage buildings. Ten masonry s...
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