5 documents found, page 1 of 1
Unsaturated behaviour of soils stabilized with fly ash from coal combustion; [C...
Araújo, N; Cristelo, N; António Topa Gomes; Miranda, TThe influence of suction on the mechanical behavior of chemically stabilized soils has not yet been consistently quantified, a situation also motivated by difficulties in the experimental procedure to characterize the unsaturated response. This paper presents retention curves obtained for a soil stabilized with Portland cement or an alkaline cement. Triaxial tests are also presented, for the same curing conditi...
Geomechanical Behaviour of Recycled Construction and Demolition Waste Submitted...
Secco, MP; Bruschi, GJ; Castorina Silva Vieira; Cristelo, NThe construction industry is one of the most important sectors for economic and social development. However, it is responsible for more than 50% of the depletion of natural resources, for 40% of the energy consumption and construction and demolition waste (CDW) accounting for 30-60% of the total municipal solid waste generated worldwide. In this sense, the recycling of CDW is considered a safe alternative to th...
Increasing the reaction kinetics of alkali-activated fly ash binders for stabil...
Rios, S; Cristelo, N; Miranda, Tiago F. S.; Araújo, Nuno Miguel Faria; Oliveira, J. M.; Lucas, EThe paper addresses several options to improve the reaction kinetics of alkali-activated low-calcium fly ash binders for soil stabilisation in road platforms. For that purpose, an experimental programme was established to assess the strength evolution, with time, of different binders, based on ash, lime, sodium chloride and alkali solutions, applied in the stabilisation of a silty sand. The tests included uncon...
Alkali-activated cement using slags and fly ash
Rios, S; Viana da Fonseca, AV; Pinheiro, C; Sandra Nunes; Cristelo, NAlkali Activated Cements (AAC) are a very convenient alternative to common binders as waste materials like slag and fly ash are included in their production. In this paper, a response surface method is used to optimize an AAC made with fly ash, steel slag, sodium silicate and sodium hydroxide. For this purpose, an experimental plan contemplating 26 mixtures was developed, which included compression and flexural...
APPLICATION OF A RECENTLY DEVELOPED GEOTECHNICAL CARBON CALCULATOR
Sara Rios; Cristelo, N; da Fonseca, AV; Rosa, I; Ramos, CRecent research regarding soil stabilization has been increasingly concerned with environmental perfoimance. The present paper applies the newly developed CO2(eq) geotechnical calculator, created by the European Federation of Foundation Contractors and the The Deep Foundations Institute, to assess the behavior of three different binders used in the construction of cutter-soil mixing columns, which foamed an emb...