Abstract: Described herein are new cementitious mortars with a high degree of fluidity and high final resistance. The mortars contain water, a hydraulic binder, a pozzolanic substance (finely ground slag), a fluidifier and/or superfluidifier, a setting regulator, and aggregates having a specific granulometric distribution. The aggregates are made up of three highly monogranular fractions (A, B, C), and a fourth fraction (D) having a low monogranularity. The new mortars described herein have values of fluidity higher, by approximately 70%, than those of mortars produced with traditional aggregates. The increase in fluidity is obtained without increasing the water/cement ratio and without increasing the amount of fluidifiers/superfluidifiers present. The mortars produced according to the invention may be used to advantage in all applications in which it is required to associate a high degree of fluidity and a high final mechanical resistance, both in compression and in flexure.

Abstract: Described herein are new cementitious mortars with a high degree of fluidity and short consolidation times. The mortars contain water, a fast-setting cement, fluidifiers and/or superfluidifiers, setting regulators and aggregates having a specific granulometric distribution. The aggregates are made up of two fractions with different grain size such that the ratio between the characteristic grain diameters of the two fractions is comprised between 2.2 and 3.2. The new mortars thus obtained have values of fluidity 2-3 times higher than those of mortars produced with traditional aggregates; the increase in fluidity is obtained without increasing the water/cement ratio and without increasing the amount of fluidifiers present. The mortars produced according to the invention may be used to advantage in all applications in which it is required to associate a high degree of fluidity and a rapid consolidation.

Abstract: A solid mixture for the preparation of concretes with a mechanical strength after 28 days that is greater than or equal to 110 MPa comprising cement, calcareous aggregates and admixtures characterised by the fact that any additions with latent hydraulic activity are less than 5% by weight compared to the cement.

Abstract: The present invention concerns a composite cement paving with photocatalytic action for reducing urban polluting agents, composed of a bituminous or cement foundation, a resin having the function of interface, a superficial cement layer with photocatalytic properties able to reduce organic and inorganic polluting agents, said paving also comprising reinforcing materials and possible suitably positioned fibrous materials. The paving thus realised presents a strong photocatalytic action, prolonged overtime, even in the presence of high mechanical stress caused by heavy traffic.

Abstract: The present invention relates to an inorganic cohesion agent for self-compacting cement pastes consisting of a co-precipitated SiO2/CaCO3 mixture.

Abstract: Use of photocatalytic preparations of colloidal titanium dioxide optionally doped with a metal chosen from groups I-VA, and the lanthanide and actinide series of the periodic table, for preserving the original appearance of cementitious, stone, and marble products.

Abstract: This invention concerns a procedure for preparing amorphous silica from calcium silicate and CO2, with formation and separation of precipitate CaCO3.

Abstract: The present invention refers to a hydraulic binder made from Portland clinker containing calcium fluoroaluminate 11CaO.7Al2O3.CaF2, to which sodium aluminate, lime, and optionally, sodium bicarbonate are added. The added lime has not undergone the formation process of clinker. The cement mix that can be obtained with this binder has a very short hardening time, scarcely influenced by temperature variations during laying operations.

Abstract: The invention provides a hydraulic binder, dry premixes and cement compositions having the improved property of maintaining unaltered, brilliance and coloring quantity for a longer time period. These compositions contain, in bulk, particles of a photocatalyst capable of oxidizing polluting substances in the environment in the presence of light, oxygen and water.

Abstract: Described herein is the use of a combination of organic additives that is particularly advantageous for the preparation of cementitious compositions having a high conservation of the degree of white, which contain in mass a photocatalyst that is able to oxidize, in the presence of light, air and ambient humidity, pollutant substances present in the environment, the said photocatalyst being, in particular, titanium dioxide prevalently in the form of anatase. The above combination of additives comprises the following: a melamine resin; a cellulose ether; a polymer chosen from among an ethylene polymer, an acrylic polymer, and a terpolymer comprising as co-monomers at least one ester of acrylic acid with an alcohol and at least one ester of vinyl alcohol with a carboxylic acid, or alternatively, an acrylic, styrene or butadiene latex; and a chemically modified starch.

Abstract: A superfluidifying composition for cement compositions is described, which contains as superfluidifying additive a salt of the product resulting from sulfonation and oxidation of fuel oils deriving from steam cracking of oil products (FOKS), and an antifoam additive comprising one or more copolymers among ethylene oxide and propylene oxide, etherified at the beginning of the polymeric chain by an alkoxy group R.sub.1 --O, wherein R.sub.1 is an alkyl group, linear or branched, having from 2 to 20 carbon atoms, and whose monomeric terminal units have their oxygen atom bound to a hydrogen atom.

Abstract: Limestone filled Portland cement wherein the fineness of limestone particles ranges from 5,000 to 12,000 Blaine and the fineness of clinker particles ranges from 1,500 to 3,000 Blaine.

Abstract: A method for manufacturing a composite girder including one or more vertical cores of steel plate, associated and cooperating with one or more horizontal slabs or flanges of concrete. At least one of the horizontal slabs or flanges is made from high-performance concrete in order to allow mutual forces or co-actions to be imposed between the several components of the girder which are much higher/stronger than the mutual forces/co-actions which can be imposed by way of other methods and materials.

Abstract: The invention concerns a MDF cement material showing better impact strength meant as an increase in the breaking total energy, by fibers addition.

Abstract: A tubular mill for grinding natural and synthetic raw materials, in particular for the cement industry, includes a rotary cylindrical drum (11, 111) arranged with its axis (27) horizontal and containing at least one grinding element (25, 34), in which there are one or more grinding chambers (22; 23, 123) connected together, in at least one (22) of which the grinding element consists of a roller (25) which when in its operating position has its axis (26) essentially parallel to the axis (27) of the drum (11, 111) and is supported by an independent external pressure and extraction support (28), the roller (25) being idle and, at least along one of its outer generating lines, engaging an annular grinding track (24) rigid with the inner wall of the drum. As the grinding element for the second chamber (23), the mill can include a second roller (34) arranged and supported as the first roller (25), or a plurality of grinding balls.