Abstract: A process for stabilizing soil, including (i) pre-treating the soil with calcium carbide slag, then (ii) treating the pre-treated soil of step (i) with a hydraulic road binder. The use of calcium carbide slag as pre-treatment for stabilizing soil.

Abstract: The invention relates to a method for the preparation of a carbonated mineral component in particular for the use as a substituent of cement in hydraulic binder compositions wherein a raw material comprising at least one of the group of concrete demolition waste, hardened concrete paste, hardened cement paste, or any mineral component containing hydrated calcium silicates, calcium aluminates is carbonated and heated, a carbonated mineral component manufactured in this way, a method for the preparation of a hydraulic binder using the carbonated mineral component and a cementitious component as well as a concrete composition with that hydraulic binder.

Abstract: A method for preparing a carbonated mineral for use in cement is provided; wherein a mineral component with a (CaO+MgO)/SiO2 weight ratio of 1.2 to 5.0 is ground to a powder; mixed with water to form a paste; the paste is placed in a reactor in an atmosphere containing CO2; the paste is carbonated in the reactor; and the resulting material is dried to constant weight; or the mineral component is ground to a Blaine fineness between 3?000 cm2/g and 10?000 cm2/g to obtain a powder; during grinding a CO2 rich gas is injected so that the component carbonates; the powder is mixed with water at a weight ratio between 0.3 and 1.5 to obtain a paste, or pre-humidified by adding water at a weight ratio between 0.03 and 0.2; the resulting material is dried to constant weight at 60-85° C.; and the resulting material is deagglomerated and sieved.

Abstract: A concrete composition having, in a mixture with water, a hydraulic binder, sand, aggregates, an expanding agent and a shrinkage reducing admixture, wherein the expanding agent is calcium oxide having a low reactivity such that the concrete casted using the composition does not expand by more than 0.05 vol. % during the first 10 days, preferably not expanding more than 0.05 vol. % during the first 7 days, after having been cast.

Abstract: The invention provides novel, microstructured clinker and cement materials that are characterized by superior grindability and reactivity. The disclosed clinker and cement materials are based on carbonatable calcium silicate and can be made from widely available, low cost raw materials via a process suitable for large-scale production. The method of the invention is flexible in equipment and processing requirements and is readily adaptable to manufacturing facilities of conventional Portland cement.

Abstract: The invention provides novel methods and compositions that mitigate the occurrence of hazing of products made from carbonatable calcium silicate-based cements. The methods and compositions of the invention may be applied in a variety of cement and concrete components in the infrastructure, construction, pavement and landscaping industries.

Abstract: The concrete composition includes, in a mixture with water, a hydraulic binder, sand and aggregates, wherein the hydraulic binder includes a Portland cement of high reactivity, and the hydraulic binder is present in an amount of 280-340 kg per cubic meter of concrete, a shrinkage reducing admixture is present in an amount of 0-4 L per cubic meter of concrete, and water is present in an amount of 140-160 L per cubic meter of concrete.

Abstract: A method for the production of a microcapsule, in particular a microcapsule of spherical shape having a hollow capsule space therein, includes the steps of: a) preparing of a suspension of particulate cementitious material in a solvent b) preparing a dispersion by mixing the suspension of step a) with an immiscible fluid so that (i) the suspension is present as a dispersed phase in the fluid as a dispersion medium or that (ii) the fluid is present as the dispersed phase in the suspension as the dispersion medium, such that the particulate material of the suspension adsorbs at least partially at a phase boundary between the fluid and the suspension, and c) allowing the particulate material adsorbed at the phase boundary to hydrate with the formation of a microcapsule.

Abstract: A method for detecting straightness deviations and/deformations in a rotary kiln, the rotary drum of which features bearing rings spaced apart from one another in the axial direction and respectively supported on rollers, the outer surface area of the rotary drum, the bearing rings, involves scanning the rollers and/or the shafts of the rollers in a contactless fashion with the aid of at least one scanning device and obtaining three-dimensional position data regarding the scanned object(s), and evaluating three-dimensional position data with respect to the occurrence of a deviation of (a) the rotary kiln axis from a straight line, (b) the rotary drum from a cylindrical shape and/or (c) the rotational axes of the rollers from a line extending parallel to the rotary kiln axis. A device for detecting straightness deviations and/or deformations in a rotary kiln, at least one scanning device and a rotary kiln so equipped are provided.

Abstract: In a method for treating waste, in particular domestic waste, comprising the providing of a closed building for receiving the waste, the roof of the building being designed as a semi-permeable membrane, the filling of the building with the waste, the waste being piled into a mound, the performing of a biological drying of the waste with the supply of air, the air exhaust taking place through the semi-permeable membrane, and the discharging of the dried waste from the building, the filling of the building and the performing of the biological drying, and optionally discharging, of the waste are carried out with an unchanged arrangement of the roof, and the filling of the building is carried out by dropping the waste from a continuous conveying device.

Abstract: In a method for reprocessing wet waste materials containing organic components, in particular sludges in a cement clinker production plant, in which raw meal is preheated in a preheater (3) in countercurrent flow to the hot exhaust gases of a clinker furnace (2), and calcined in a calciner (4) fired with alternative fuels, the wet waste materials are dried in a drying unit (18) using a hot gas produced from the preheater waste heat and the dried waste materials and the drier exhaust gases are discharged from the drying unit (18), wherein the drier exhaust gases are introduced into the calciner (4).

Abstract: In a device for taking samples from a material flow of fine-grained and dry material, in particular in the cement industry, comprising an upwardly open sample chamber (2) capable of being introduced into, and retracted from, the material flow through an introduction socket, the sample chamber (2) is formed in a rod-shaped body (1) translationally guided between a sampling position and a retracted position, and the sample chamber (2) has an openable bottom (7).

Abstract: In a method for reprocessing wet waste materials containing organic components, in particular sludges in a cement clinker production plant, in which raw meal is preheated in a preheater (3) in countercurrent flow to the hot exhaust gases of a clinker furnace (2), and calcined in a calciner (4) fired with alternative fuels, the wet waste materials are dried in a drying unit (18) using a hot gas produced from the preheater waste heat and the dried waste materials and the drier exhaust gases are discharged from the drying unit (18), wherein the drier exhaust gases are introduced into the calciner (4).

Abstract: In a process for the production of cement clinker, in which raw meal is preheated in a preheater (3) using the hot exhaust gases from a clinker kiln, and the preheated raw meal, which is optionally calcined in a calciner (4), is burned to clinker in the clinker kiln (2), wherein the preheater (3) comprises at least one string of a plurality of cyclone suspension-type heat exchangers (8, 9, 10), through which the kiln exhaust gas successively flows and in which the raw meal is preheated in stages, a partial stream of the kiln exhaust gas is diverted such that only a remaining residual stream of the kiln exhaust gas is utilized for preheating the raw meal.

Abstract: In a device for transmitting a torque to a rotary kiln (13), including a drive shaft driven by a motor and having a drive pinion driving a gear rim connected to the rotary kiln, the drive pinion (5) drives the gear rim (12) via an interposed transmission (6), wherein a gear wheel (7) of the transmission (6) engages with the drive pinion (5) in a manner displaceable in the axial direction.

Abstract: In a method for treating alternative, carbon-containing, low-caloric waste materials for use in furnace systems, in particular rotary tubular kilns for the production of clinker, the carbon-containing, alternative fuels are subjected to high-temperature gasification under anoxic conditions at temperatures above 1000° C., wherein water, water vapor or CO2 is injected to ensure a reaction forming CO and H2. The waste heat from a clinker cooler is used for the high-temperature gasification.

Abstract: In a device for restricting hot, dust-laden gas flows and, in particular, dust-laden hot cooling air from clinker coolers (4) in a tertiary air duct (5) of a clinker kiln, the restrictor (6) is formed by segments (8) which are displaceable transversely to the direction of flow in a duct (5) and which are connectable with one another.

Abstract: A method for the production of an alkali activated hydraulic binder, with the binder comprising slag, natural aluminum silicates, and an alkali activator, and the binder being free of CaSO4. The slag is provided in amounts greater than or equal to 20% (w/w), and the natural aluminum silicates are different from furnace slag, and are provided in amounts from 5 to 75% (w/w). The alkali activator is provided in an amount which corresponds to a Na2O equivalent defined as (Na2O+0.658 K2O) (ASTM C 150) between 0.7 and 4% (w/w). The method includes the step of heat treating a mixture of the slag, the natural aluminium silicates, and the alkali activator at temperatures between 40° C. and 50° C. for 4 to 6 hours.

Abstract: A hydraulic binder containing 25 to 85 wt % of cement clinker, 0 to 7 wt % of CaSO4, a mineral additive(s), and 1 to 10 wt % of a dual setting control system that includes an activator and a retarder, in a weight ratio of activator to retarder, based on the dry substance selected to be greater than 85:15, in particular greater than 90:10, more particularly greater than 95:5, and, in particular, greater than 98:2.

Abstract: A method for detecting straightness deviations and/deformations in a rotary kiln (1), the rotary drum (4) of which includes bearing rings (6) spaced apart from one another in the axial direction and respectively supported on rollers (7), involves scanning the outer surface area (5) of the rotary drum (4), the bearing rings (6), the rollers (7) and/or the shafts (17) of the rollers (7) in a contactless fashion with the aid of at least one scanning device (12) such that three-dimensional position data regarding the scanned objects is obtained, and evaluating the three-dimensional position data with respect to the occurrence of a deviation of the rotary kiln axis (3) from a straight line, a deviation of the rotary drum (4) from a cylindrical shape and/or a deviation of the rotational axes (8) of the rollers from a line extending parallel to the rotary kiln axis (3). A device for detecting straightness deviations and/or deformations in a rotary kiln (1) is also provided.