Abstract:
Disclosed is a process for the preparation of a carbonaceous molded body, which comprises mixing elastic graphite particles with a binder and molding the mixture. A carbonaceous molded article having a light weight and an excellent elasticity, which is characterized by a bulk density lower than 1.0 g/cm.sup.3 and a recovery ratio of 50% or more at a compressibility of 5 to 50%, is obtained according to this process.
Abstract:
A lightweight insulating refractory shape is made of Si.sub.2 ON.sub.2 having a density of less than 50% of theoretical, a relatively high compressive strength, a low thermal conductivity and high resistance to attack by chlorine, fused chlorides and molten aluminum.
Abstract:
A method for producing a carbonaceous molding of the invention comprises molding a mixture of elastic graphite particles with a binder to give a lightweight elastic carbonaceous molding having a bulk density of at most 1.0 g/cm3 and a recovery of at least 50 % at a compressibility of 5 to 50 %.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von Verbundwerkstoffen, insbesondere Doppelbodenplatten, aus durch Hydratbildung mit Anmachwasser erhärtenden Bindemitteln und Fasern (Einsatzstoffe), wobei
a) alle Einsatzstoffe gemischt werden und das Wasser-Bindemittel-Verhältnis w ≦ 1,5 w₀ ist, b) die so hergestellte Frischmasse in Form eines Vlieses homogen ausgestreut wird, c) das Vlies auf eine Rohdichte von mindestens 0,9 ρ₀ verdichtet wird, und daß d) eine anschließende Aushärtungsphase unter Druck erfolgt.
Die Erfindung betrifft weiter die mit dem Verfahren hergestellten Verbundwerkstoffe.
une étape de préparation d'une formulation de béton comprenant au moins un agent tensio-actif adapté, en nature et en proportions, pour que, additionné à de l'eau pure, il confère à l'eau additionnée une énergie de surface inférieure à 50 mJ/m 2 . une étape de coulage de ladite formulation dans un moule dont les parois ne sont pas enduites d'agent de démoulage hydrophobe et présentent une énergie de surface inférieure à 35 mJ/m 2 , une étape de cure dont le taux d'humidité et la durée sont amenés à un niveau suffisamment élevé pour optimiser la facilité de démoulage et la qualité lisse de ladite surface.
Abstract:
The invention relates to a preparation of a concrete having a compression resistance of at least 400 MPa and a fracturation energy of at least 1 000 J/m2. A mix containing substantially cement, fine sand, amorphous silica, crushed quartz, steel wool, a fluidifying agent and water in specific proportions is mixed and, after setting, the concrete is fired at a temperature of at least 250 °C. The figure is a micrography showing the microstructure of concrete according to the invention. The invention provides particularly for the making of concrete parts in replacement of steel, for example anchoring heads for prestressed cables.
Abstract:
. Panneau d'isolation thermique et/ou acoustique caractérisé en ce qu'il comprend un mélange séché :
- de silice de précipitation constituée par un gâteau de filtration issu de la réaction de précipitation et délité, - d'un agent de renforcement, - éventuellement, d'un agent opacifiant.
Procédés d'obtention dudit panneau à partir d'un gâteau de filtration issu de la réaction de précipitation d'une silice.
Abstract:
The present invention relates to an improved cordierite glass-ceramic. In order to improve the materials properties, it is proposed that the glass-ceramic comprising SiO2, Al2O3, MgO and Li2O contains cordierite as main crystal phase and that a secondary crystal phase of the glass-ceramic comprises high-quartz solid solution and/or keatite solid solution. The invention further relates to a process for producing such a glass-ceramic and the use of such a glass-ceramic.
Abstract:
Disclosed are solar-reflective building materials, including roofing articles, that include nanoparticle-containing thin films; such articles display high reflectance of near-infrared radiation and high transmission of radiation in the visible light range so as to reduce the heat island effects experienced by the articles while also maintaining an aesthetically pleasing appearance. Also disclosed are related methods of fabricating such articles.