Abstract:
Methods may include pumping a cement composition containing one or more conductive fillers into an annular region of a wellbore created between a casing and a surface of the wellbore, allowing the cement composition to cure, emplacing a tool for measuring at least one electromagnetic property into the wellbore, and measuring at least one of the cemented casing and the formation. In another aspect, methods may include preparing a cement composition containing one or more conductive fillers, allowing the cement composition to set, and measuring at least one electromagnetic property of the set cement. In yet another aspect, cement compositions may contain a cement, one or more conductive fillers, and a surfactant, wherein the resistivity of the cement composition is less than 10 Ω*m.
Abstract:
The present invention relates to a blend of reinforcement fibers for use in a variety of applications. In particular, the blend of reinforcement fibers can be used in cementitious compositions, such as Portland cement concrete and asphalt cement concrete compositions to reduce or preclude voids and/or cracks formed in the cement concrete upon placement. The blend of reinforcement fibers includes a plurality of first fibers and a plurality of different second fibers. The first and second fibers can be different based on coarseness/fineness, melting temperature, denier and specific chemical or material composition. In certain embodiments, one of the plurality of first fibers and the plurality of different second fibers has a melting temperature that is lower than the temperature of an asphalt cement concrete composition such that the plurality of first or different second fibers serves as a carrier/buffer to improve distribution and dispersion of the fibers in the Portland or asphalt cement concrete composition.
Abstract:
Mischung von hochfestem Beton (HFB), insbesondere von ultrahochfestem Beton (UHFB) und Verstärkungsfasern, dadurch gekennzeichnet, dass die Verstärkungsfasern als vereinzelte Bündel im ultrahochfesten Beton derart vorliegen, dass die Bündel im Wesentlichen allseitig vom Beton umgeben sind.
Abstract:
A reinforcing element and a method of forming the reinforcing element are generally described. The reinforcing element may be used in reinforcing a cementitious material and may comprise a settable material and a tension-resistant material that extends for a length of the element. To form the reinforcing element the settable material and tension-resistant material may be disposed together such that the settable and tension-resistant materials generally take the form of the reinforcing element. The settable material may then be cured.
Abstract:
Provided are compositions, methods and systems including cementitious compositions and reinforcing materials wherein the cementitious composition comprises a metastable component.
Abstract:
The invention relates to a heating device (1), comprising a heating body (2, 11, 21, 31, 41) that is plate-shaped or planar and flat, or that is curved once or multiple times in the same direction or opposite directions, the heating body being made of a hydraulically bound material, preferably cement, which has a high packing density, and at least one electrical resistance heating element (5), which is embedded in the hydraulically bound material.
Abstract:
Procédé pour extraire de la chaleur d'un effluent (2) circulant dans une conduite (1 ), notamment un collecteur d'eaux usées, selon lequel on installe, au moins dans le fond de la conduite, un échangeur de chaleur (E) qui baigne dans l'effluent, l'échangeur de chaleur (E) étant formé par enrobage de tubes (3) avec un béton suffisamment conducteur de la chaleur coulé autour des tubes destinés à la circulation d'un fluide caloporteur, l'échange calorifique avec l'effluent de la conduite s'effectuant au travers de l'enrobage moulé; le béton (4) de l'enrobage est composé d'au moins 50% en masse de carbure de silicium, d'une charge en aiguilles d'un matériau conducteur de la chaleur et résistant mécaniquement, d'un liant et du complément en alumine, en poudre métallique ou en carbone..
Abstract:
Zusammensetzung, enthaltend -5 bis 90 Gew.-% mindestens eines anorganischen Bindemittels, -0,1 bis 10 Gew.-% Ruß und -0,1 bis 15 Gew.-% Kohlenstofffasern, jeweils bezogen auf das Gesamtgewicht der Zusammensetzung, Spachtel-, Estrich- oder Bodenausgleichsmassen, enthaltend diese Zusammensetzung, sowie die Verwendung der Zusammensetzung bzw. daraus erhältlicher Spachtel-, Estrich- oder Bodenausgleichsmassen zur Herstellung eines flächigen Heizelements, insbesondere zur elektrischen Beheizung einer Boden-, Wand- oder Deckenfläche.
Abstract:
An about 5/8 inch to 3/4 inch thick low weight, low density gypsum panel with fire resistance capabilities sufficient to provide a Thermal Insulation Index of at least 17.0 minutes which when subjected to U419 test procedures will not fail for at least 30 minutes and, in selected embodiments, also has outstanding water resistance properties.
Abstract:
El procedimiento se caracteriza porque comprende al menos una capa sol-gel con un espesor máximo de 800 nm, donde dicha capa sol-gel comprende nanopartículas de estructura cristalina laminar, y donde cada capa sol-gel se obtiene a partir de una disolución de un alcóxido de silicio; preparación de una dispersión que comprende al menos un tipo de partículas de morfología esférica, fibrilar o laminar, de estructura cristalina laminar, en donde al menos una de las dimensiones, espesor o diámetro, de dichas partículas es inferior a 400 nm; adición de la dispersión preparada sobre la disolución; deposición de la suspensión sobre dicho sustrato; tratamiento térmico del sustrato; y en el caso de multicapa, opcionalmente la adición de partículas de alta dimensionalidad y repetición de las etapas con la condición de que el tratamiento térmico de la última capa o capa externa sea igual o superior al de la capa anterior. La invención también se refiere al recubrimiento sol-gel así obtenido. La presente invención soluciona el problema de contracción en la densificación de recubrimientos sol-gel de espesor elevado y además proporciona un procedimiento para la obtención de un recubrimiento sol-gel útil para superficies cerámicas de gran tamaño y/o formas complejas.