Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

Browse

Has files: YesSubject: search.filters.subject.Slag

Search Results

Now showing 1 - 5 of 5
  • No Thumbnail Available
    Item
    Effect of alkaline carbonate-based activators on the properties of one-part ternary hybrid cement
    (Elsevier, 2024) Oualit, Mehena; Sarri, Arezki
    This paper investigates the use of solid alkaline carbonates (Na2CO3 and K2CO3) as activators for the production of one-part hybrid cement from a combination of three precursors: blast furnace slag, metakaolin, and clinker. The impact of activator dosage and the nature of the alkaline cation (Na+ or K+) on the compressive strength (Cs) and microstructure of the elaborated materials was studied. The results indicate that the highest Cs values are achieved with 5 % Na2CO3. The analysis of the reaction products’ microstructure reveals that the inclusion of Na2CO3 mainly produces (N,C)-A-S-H and C-A-S-H cementitious gels, along with metastable carboaluminates and different types of calcium carbonate. Additionally, the presence of K2CO3 results in the creation of hemicarboaluminate.
  • No Thumbnail Available
    Item
    Characterisation and microstructure of high-performance concretes reinforced with metal fibres ripened in seawater
    (Taylor & Francis, 2019) Boutiba, Aldjia; Chaid, Rabah; Molez, Laurent
    High-performance concretes reinforced with metal fibres (SFRHPC) have multiple advantages when they are used in the marine environment. These materials provide high strengths at the young age that permit faster formwork stripping, resistance to hydrostatic thrusts due to the tides, structural elements sections’ reduction, as well as weight reduction of the structure, and the increase of the abrasion resistance to sand or gravel. The maritime works are exposed to specific seawater aggressions. Seawater contains aggressive salts, which damage the concrete and the steel that it may contain. These salts are mainly chlorides and sulphates. This study investigated the ripening of steel fibre-reinforced high-performance concrete, with 15% substitution of cement by blast furnace slag, in Rance (France’s seawater). This experimental study analysed the effect of 6 and 24 months of ripening of the sample, in aggressive water, on the characterisation of the concrete and the microstructure of the cement’s matrix and its fibres. Also, in this study, after two years of concrete conservation, we carried out the chemical and mineralogical composition of the seawater. The results showed that there is no significant alteration of concrete kept in seawater and the steel fibres were not altered. In other words, it stayed passivated even after two years of ripening
  • No Thumbnail Available
    Item
    Effects of calcined halloysite nano-clay on the mechanical properties and microstructure of low-clinker cement mortar
    (Elsevier, 2018) Allalou, Sara; Kheribet, Rabia; Benmounah, Abdelbaki
    This paper explores the effects of calcined halloysite nano-clay (CHNC) on the physico-mechanical properties and microstructure of high volume slag (HVS) cement mortar. The principal objective of this research is to constitute a low-clinker cement mortar with high mechanical properties. Ordinary Portland cement clinker blended with 70% of ground granulated blast furnace slag (GBFS) was partially substituted with CHNC in ratios of 0%, 1%, 2%, 3%, 4%, 5% and 6% by weight. The results showed that the early age and long-term mechanical strengths of the slag cement mortars were significantly improved by the presence of CHNC. The slag cement containing 5 mass % of CHNC possessed the highest improvement of the mechanical properties and microstructure of hardened cement pastes and mortars. It was suggested that the higher pozzolanic activity of CHNC particles and the nucleation of calcium hydrosilicate (C–S–H) caused the enhanced strength development
  • No Thumbnail Available
    Item
    Resistant to sulphate attack of high performance fibre concrete with the addition of slag
    (Stowarzyszenie Producentow Cementu, 2015) Boutiba, Aldjia; Chaid, Rabah; Molez, Laurent; Jauberthie, Raoul
  • No Thumbnail Available
    Item
    Ripening in chemically aggressive environment the HPC reinforced with hybrid steel fiber
    (2016) Boutiba, Aldjia; Chaid, R.; Molez, L.; Jauberthie, R.