Abstract: The present invention concerns a Portland cement-free porous rigid mineral substrate made of alkali-activated pozzolans, a method for preparing the same, and use of said substrate to optimize plant germination and growth.

Abstract: The present invention concerns a Portland cement-free porous rigid mineral substrate made of alkali-activated pozzolans, a method for preparing the same, and use of said substrate to optimize plant germination and growth.

Abstract: Method to artificially agglomerate finely divided materials. A method to agglomerate finely divided material into aggregates, the aggregates being larger than the finely divided material, comprising the steps of (a) mixing finely divided material, binder and water in a mixer, (b) adding an agglomerating agent to the mix formed in step (a) and mixing constantly. Finely divided material is selected from the group consisting of cement, sand, clay, glass, slag, fly ash, stone powder, bypass dust, limestone, silica fume, crushed brick, brick powder and crushed stone or a combination thereof.

Abstract: A concrete mix having sand, fine aggregates, binder, fibers, and various admixtures is provided. The mix has a consistency from S2 to SF3, a compressive strength in the range of 30-80 MPa and a ductility represented by fc, ffl, fR1 and fR3 values, wherein the concrete mix contains at least 390 Kg of binder, the concrete mix has a paste volume of 300-600 liters, the concrete mix contains at least two systems of fibers and a general admixture system that is composed of at least 2 sub-admixture systems.

Abstract: Some embodiments are directed to a new castable cement based material containing a special admixture based internal curing system to reduce the shrinkage and avoid the formation of cracks, and method of producing the same.

Abstract: Method to produce aggregates from unsettled cementitious mixtures, comprising the steps of (a) adding at least one pelletizing agent to an unsettled cementitious mixture, (b) mixing constantly the mixture of step (a) in a mixer to produce pellets, (c) discharging the pellets obtained in step (b) and (d) drying the pellets formed in step (c). The pelletizing agent is selected from the group consisting of cellulose, chitosan, collagen, polyacrylamide and co-polymers of polyacrylamide and polyacrylics, polyamines, polyvinylalcohols, polysaccharides, lactic acid, methacrylic acid, methacrylate, hydroxyethyl, ethylene glycol, ethylene oxide, acrylic acid, inorganic flocculants and inorganic coagulants.

Abstract: A concrete mix having sand, fine aggregates, binder, fibers, and various admixtures is provided. The mix has a consistency from S2 to SF3, a compressive strength in the range of 30-60 MPa and a ductility represented by fc, ffl, fR1 and fR3 values, wherein the concrete mix contains at least 390 Kg of binder, the concrete mix has a paste volume of 300-600 liters, the concrete mix contains at least two systems of fibers and a general admixture system that is composed of at least 2 sub-admixture systems.

Abstract: A concrete mix having sand, fine aggregates, binder, fibers, and various admixtures is provided. The mix has a consistency from S2 to SF3, a compressive strength in the range of 30-80 MPa and a ductility represented by fc, ffl, fR1 and fR3 values, wherein the concrete mix contains at least 390 Kg of binder, the concrete mix has a paste volume of 300-600 liters, the concrete mix contains at least two systems of fibers and a general admixture system that is composed of at least 2 sub-admixture systems.

Abstract: A concrete mix having sand, fine aggregates, binder, fibers, and various admixtures is provided. The mix has a consistency from S2 to SF3, a compressive strength in the range of 30-80 MPa and a ductility represented by fc, ffl, fR1 and fR3 values, wherein the concrete mix contains at least 390 Kg of binder, the concrete mix has a paste volume of 300-600 liters, the concrete mix contains at least two systems of fibers and a general admixture system that is composed of at least 2 sub-admixture systems.

Abstract: Method to artificially agglomerate finely divided materials. A method to agglomerate finely divided material into aggregates, the aggregates being larger than the finely divided material, comprising the steps of (a) mixing finely divided material, binder and water in a mixer, (b) adding an agglomerating agent to the mix formed in step (a) and mixing constantly. Finely divided material is selected from the group consisting of cement, sand, clay, glass, slag, fly ash, stone powder, bypass dust, limestone, silica fume, crushed brick, brick powder and crushed stone or a combination thereof.

Abstract: A method for placement of roller compacted concrete (RCC) on a sub-base to produce a concrete pavement, which has: (a) dosing a concrete or concrete ingredients and loading the concrete or concrete ingredients into a concrete transportation truck, (b) adding at least one pelletizing agent to the concrete and waiting from 3 to 15 minutes under constant mixing to produce a pelletized concrete and (c) discharging the pelletized concrete obtained in step (b) on the sub-base from the concrete transportation truck, rotating the drum of the concrete transportation truck.

Abstract: A method for placement of roller compacted concrete (RCC) on a sub-base to produce a concrete pavement, which has: (a) dosing a concrete or concrete ingredients and loading the concrete or concrete ingredients into a concrete transportation truck, (b) adding at least one pelletizing agent to the concrete and waiting from 3 to 15 minutes under constant mixing to produce a pelletized concrete and (c) discharging the pelletized concrete obtained in step (b) on the sub-base from the concrete transportation truck, rotating the drum of the concrete transportation truck.

Abstract: The disclosure concerns a device for determining the dimension of the upper concrete cover of a concrete component, having at least one fastening by means of which the device can be fixed to a reinforcement for a concrete component and at least one section capable of projecting above the upper concrete cover during casting in the reinforcement, wherein this section presents means of configuration by which the dimension of the upper concrete cover may be determined.

Abstract: A method of reducing the drying shrinkage of a cementitious composition to which water has been added and the composition placed, comprising adding to the composition prior to placement at least one siloxane compound that is at least one of liquid and soluble in at least one of water and aqueous alkali.

Abstract: A composition for improving the properties of a cementitious composition comprises a fluid blend of at least one polyalkylene oxide, at least one aqueous paraffin emulsion, at least one siloxane and, if necessary for fluidity, water.