Auswahl der wissenschaftlichen Literatur zum Thema „Laitier de hauts fourneaux (LHF)“
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Zeitschriftenartikel zum Thema "Laitier de hauts fourneaux (LHF)":
Aziz, Abdellah, Abdelkader Iddou und Mohand Said Ouali. „Adsorption d'Hg(II) en solution aqueuse par le laitier des hauts fourneaux“. Water Quality Research Journal 42, Nr. 1 (01.02.2007): 41–45. http://dx.doi.org/10.2166/wqrj.2007.006.
Behim, M., B. Redjel und R. Jauberthie. „Réactivité du laitier de hauts fourneaux d'Annaba (Algérie) en substitution partielle du ciment“. Journal de Physique IV (Proceedings) 12, Nr. 6 (Juli 2002): 223–28. http://dx.doi.org/10.1051/jp4:20020230.
Achoura, D., Ch Lanos, R. Jauberthie und B. Redjel. „Influence d'une substitution partielle du ciment par du laitier de hauts fourneaux sur la résistance des mortiers en milieu acide“. Journal de Physique IV (Proceedings) 118 (November 2004): 159–64. http://dx.doi.org/10.1051/jp4:2004118019.
Dissertationen zum Thema "Laitier de hauts fourneaux (LHF)":
Moula, Soufien. „Comportement à court et long termes des bétons à ultra-hautes performances (BUHP) à base de laitiers des hauts fourneaux“. Electronic Thesis or Diss., Orléans, 2023. http://www.theses.fr/2023ORLE1019.
Ultra-High Performance Concrete (UHPC) is a relatively new type of cement-based composite with exceptional mechanical and durability properties. This work explores the possibility of developing a more sustainable UHPC with a high level of cement replacement (up to 50%) by ground granulated blast furnace slag (GGBS) and low silica fume (SF) content. In this study, cement is replaced by slag at 30% and 50% by volume. Slags of two different finenesses are used, with Blaine finenesses of 420 m²/kg (SL1) and 700 m²/kg (SL2), respectively, at a constant water-to-binder ratio (w/b) of 0.16 for all mixes. The effects of slag fineness and dosage on the early-age and long-term behaviour of UHPC are investigated.Experimental results show that it is indeed possible to produce SL2-based UHPCs with a behaviour similar to that of conventional silica fume-based materials. Partial replacement of cement with low slag content (30%) reduces the need for superplasticizer (SP), promotes the hydration process and accelerates setting. With high SL1 content (50%), the SP content increases, resulting in a delay in the hydration reaction and setting. However, the workability of the UHPC containing 50% of SL2 was significantly improved. An acceleration effect was therefore observed. The SL2-based mixes (at 30% replacement level) show the highest autogenous shrinkage. Compressive strength measurements indicate that a 30% SL1 content slightly improves the compressive strength of the concrete at 28 days. Due to its relatively high reactivity, SL2 increases the compressive strength at 3 days at a low level. The compressive strength of the mix containing 50% of SL2 was close to that of the reference concrete after 28 days of hydration. The results also show that all the UHPCs tested have a splitting tensile strength greater than 6 MPa at 28 days. The microstructure characterization showed that all the mixes analysed have an ultra-dense microstructure with reduced porosity. The effect of slag was more pronounced at 30% and 50% of SL2 replacement and with the presence of SF particles. In this case, the porosity of these concretes was extremely reduced and the overall pore network became finer, reducing their transfer properties. In the long term, all mixes show superior durability as their matrices are almost impermeable to carbon dioxide and chloride.From an environmental point of view, the partial replacement of cement with GGBS reduces the environmental impact of UHPC. For 1 m3 of UHPC, the incorporation of 50% of superfine slag (SL2) reduces CO2 emissions by about 41%, making SL2-50SF more sustainable than the SF-based reference concrete. However, this high SL2 content increases the production cost by 15%, compared to the reference mix
Reeb, Charles. „Synthèse et caractérisation de composites à base de matériaux alcali-activés incorporant des huiles minérales pour la gestion des huiles tritiées“. Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0020.
This work deals with the conditioning of tritiated industrial oils in the context of nuclear wastes that are still deprived of an appropriate treatment solution. The strategy consists in directly conditioning model mineral oils in alkali-activated materials (AAM), additionally functionalized with a γ-MnO2/Ag2O hydrogen/tritium getter. Geopolymer (GEO) and alkali-activated blast furnace slag (AABFS) are considered as AAM. In the presence of surfactants, the oil was successfully emulsified (small and homogeneous droplets) in both types of AAM. Two surfactant mechanisms are distinguished acting by: 1) decreasing the interfacial tension or 2) promoting oil-particles interactions. Mechanism 1 should be favored if workability of fresh mixtures is required, while mechanism 2 should be targeted to provide a better confinement of oil owing to strong oil-particles interactions. After curing, AAM-OIL composites are obtained. There is no influence of the oil and surfactants on the setting time and strength development of AAM. The main reaction products (C-A-S-H in AABFS and N-A-S-H in GEO) are not impacted. However, the addition of surfactants leads to increased porosity of AAM due to air bubbles stabilization. AAM-OIL composites immobilizing 20%vol. of oil all have compressive strengths higher than 20 MPa, which is a more than the 8 MPa required from ANDRA. Overall, according to both fresh and hardened states observations, GEO exhibit higher performances for the immobilization of oil than AABFS. The efficiency of the γ-MnO2/Ag2O getter was assessed in AAM via in-situ hydrogen production by gamma irradiations or magnesium corrosion. Both types of experiments agree to the higher performances of the getter in GEO than in AABFS. This is explained by reducing sulfur species present in AABFS, which react with the oxidizing getter components. Finally, wetting measurements demonstrated that industrial oils have an excellent affinity for GEO, testifying that long-term water seepage is not likely to dislodge them from GEO-OIL composites. In the context of nuclear waste management, GEO functionalized with γ-MnO2/Ag2O getter appears as a promising option for disposal of tritiated oils. However, additional investigations of HTO confinement need to be performed that could renew the interest of using AABFS
Salain, I. Made Alit Karyawan. „Réactivité des cendres de combustion en Lit Fluidisé Circulant et des mélanges cendres - laitier de haut fourneau“. Lyon, INSA, 2001. http://www.theses.fr/2001ISAL0032.
The CFB ashes studied, resulting from the combustion of various coals, come from the 250 MWe Provence power station in Gardanne, the most powerful of CFB power stations existing in the world nowadays, and from the 52 MWth Somedith power station in Marseille. The physical and mechanical character of CFB ashes, in presence of water, depends essentially on their chemical and mineralogical composition. Indeed, the strongly expansive character presented by the majority of these ashes is due to the continuous and significant formation, as showed by the DTA, XRD and SEM results, of the expansive phases, ettringite, gypsum and possibly hydroxide of calcium, without sufficient formation of C-S-H. Two simple models, numerical and empirical, are then proposed to envisage these characters. The first model presents a global and estimated calculation of hydration products formed and the second introduces an index known as of reactivity IR, determined from the principal components: SiO2, AL2O3, CaOtotal S03 and free lime CaO. A treatment of CFB ashes by prehydration is proposed and allows to extinguish the quicklime and to form a part of ettringite. The awaited chemical conversions occur well, but the physical and mechanical properties of the pastes of ash are not much improved. An alternative treatment for CFB ashes valorization is by blend these ashes with a ground vitrified blast furnace slag. The binders obtained respect the requirements of the new French standard of road hydraulic binders NF P 15-108. In such a special binder, these ashes play a double role: activation and reinforcement. Even, a simple method proposed, implying IR and the percentage of free lime CaO and S03, leads to an optimal use of ashes and a forecast of the maximum strength
Lognot, Isabelle. „Etude de l'hydratation de laitier de hauts fourneaux et de ses produits en présence de différents activants. Applications aux coulis d'injection“. Dijon, 1996. http://www.theses.fr/1996DIJOS011.
Le, Cornec Domitille. „Étude de la structure des laitiers vitrifiés de hauts-fourneaux et de leur réactivité à l'eau en milieu basique“. Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS556.
Blast-furnace slag is a by-product of steel industry used as a supplementary cementitious material. This calcium (Ca)-rich aluminosilicate glass has latent hydraulic properties. It can be used to make slag cements with low-carbon footprints and high resistances to aggressive environments.The objective of this thesis is, first, to study the glassy structure of slags and its impact on the properties of the material. We use chemically selective techniques (XANES and EXAFS), medium-range analysis (SEM, EPR, PDF) and complete these results with a simulation. The hydration of slag is based on a dissolution-reprecipitation mechanism in which Ca plays a significant role. This element is in complex environments and is not randomly distributed in the glassy structure. The Ca sites form a modifier sublattice which could make the dissolution of the slag easier.We, then, study the speciation of titanium (Ti) in the slags. This element is minimally present in the composition but according to industrial reports, it lowers the mechanical resistance of mortars containing slag cements. Ti is mainly five-fold coordinated and stabilizes the glassy structure. This could lead to a loss of reactivity of the material and cause the industrially observed performance deterioration. Compressive strength tests are performed on micro-mortars
Tong, Xiaoping. „Le gaz SiO, vecteur de silicium dans le haut fourneau : étude cinétique de ses réactions avec le métal et le laitier“. Châtenay-Malabry, Ecole centrale de Paris, 1989. http://www.theses.fr/1989ECAP0099.
Kiiashko, Artur. „Amélioration des propriétés rhéologiques et à jeune âge des laitiers alcali-activés au carbonate de sodium“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN033.
Today, environmental problems are more acute than ever. Urgent measures should be taken in all spheres of human activity including construction and civil engineering. One of the major contributors of negative environmental impacts from this industry is the manufacturing of ordinary Portland cement (OPC) required for concrete and other cementitious materials production. Although its importance to economical development, it has a significant drawback - its production is accompanied by the emission of large quantities of greenhouse gases. They account for 5-8% of total world CO2 emissions. More environmentally friendly cementitious materials are now required.Significant reductions of the environmental impact can be achieved only through the use of new-generation binders whose manufacture does not require a lot of additional processes and treatments. One route is through the use of industrial wastes as binders (different slags, fly ash, biomass bottom ash, etc.). In this way there is not only a reduction in the impact of processes such as mining or calcination, but also the recycling of waste materials (circular economy principle).One possibility is to use ground granulated blast furnace slag (GGBS) as the basis for such a new generation cement. Due to its rather low reactivity with water, additional supplements (also called activators) should be used to promote the hydration process. One of the most promising, and at the same time least studied, activators is sodium carbonate (Na2CO3). Such alkali-activated cements present high mechanical and durability properties, as well as a very low CO2 footprint. Among the main problems hindering its industrial scale adoption are their poor rheology and too slow strength gain within the first days of hardening.The objective of the present thesis is to develop a new binder based on Na2CO3 activated GGBS that would meet all the modern requirements of the construction industry, in particular regarding the rheological properties and early age strength development. In addition this binder should always respond to at least three main criteria: low environmental impact, low health and safety concerns in field applications, and be economically competitive at industrial scale.In the present work, the influence of different parameters like water/binder ratio, Na2CO3 concentration, slag fineness and curing conditions on both early age and long term properties of the mixture were studied. Based on the results of the hydration process analysis, phosphonate based additives that allow for the effective control of the rheology of such binders were successfully tested. They not only allow control over the setting time, but also provide a plasticizing effect.Regarding the improvement of early age strength properties, various methods have been used. The use of heat treatment or an increase of GGBS fineness turned out to be efficient. Exploring the causes of the long induction period has shown that acceleration can also be achieved by the addition of a calcium source with controlled dissolution kinetics. As a result, the binder became more reactive and robust against certain factors (activator concentration, Water/Binder ratio, curing conditions, etc.). To compensate for the additional carbon footprint from the added calcium source, the binder was successfully diluted by limestone without any degradation of the properties below some dilution percentages