A concrete composition made up of a binder, water, a fine aggregate, a coarse aggregate, and a one-component, in which a water/binder ratio is 30 to 70% by mass, a slump flow value is 35 to 75 cm, and a one-component admixture using four specific components and water is contained in a proportion of 0.5 to 3.0 parts by mass relative to 100 parts by mass of the binder.

A method for reinforcing a structure comprising the following steps: preparation of UHPFRC comprising a cement precursor mix, of water, a fluidizing agent and metal fibers, transporting the UHPFRC by pumping to a suitable spray nozzle, spraying the mix onto a surface of the structure by the addition of a compressed air stream in the spray nozzle.

A concrete additive, which provides superior pump component protection, reduction of corrosion including wear and damage on pump components, and increased lifespan of the components in a concrete pump system. As concrete slurry mixes in the pump barrel of a ready mix cement truck, the concrete slurry blends directly with the pump additive and converges with the concrete pump components as the concrete blend mixes. This direct contact allows the pump additive to lubricate the component parts, which provides a corrosion inhibitor that protects the component parts from the harsh side effects of the aggregate rubbing against the liners, pistons and pump component parts thereby significantly extending the life of the component parts of the concrete pumping system. The cement additive compositions and methods of the present invention may be used in well bore drilling, cement production and delivery systems, and fracking operations.

Method of making foamed gypsum slurry having 15 to 90 volume percent gas bubbles including: passing first slurry including water and on dry basis 50 to 98 wt. % calcium sulfate hemihydrate, 1 to 50 wt. % calcium carbonate, and 0.1 to 10 wt. % cellulose thickener via a first hose to a Wye connector conduit first inlet opening at Rate C and passing alum solution via a second hose to a second inlet opening of the conduit at Rate D to create combined mixed stream passing from the conduit to a static mixer for mixing for Time 3 to activate at least a portion of the calcium carbonate and alum to generate CO.sub.2 and create the foamed gypsum slurry; transferring the slurry from the mixer to a cavity between two wall boards via a third hose. Allowing the slurry in the cavity to expand, harden and dry.

Methods, systems, and devices, are developed for creating a means of in-situ placement of a concrete mix that can have the thixotropy to hold vertical dimension without containment, while maintaining pliability to be pumped into place and manipulated to a desired shape, and can be combined with concrete set accelerators, allowing subsequent layers of this concrete mix to be continuously stacked in place to build tall walls and such without the use of forms. Concrete without these special properties is pumped toward the point of placement where it is modified by injecting and mixing, into that line of pumped concrete, an admixture containing thixotropes, thickeners and/or set accelerators or other modifiers to provide these properties and other improvements. This method allows conventional plant batching with commonly available constituent materials for batching an economical concrete that is delivered to a jobsite and then is pumped most of the way to a point of placement, before inline modification; allowing minimal conveyance and pumping of a zero-slump and set-accelerated concrete mix, avoiding difficulties and risk associated with pumping such a modified concrete mix. Various means of metering the injection of the admixture flow rate to correspond proportionally to the concrete flow rate are also disclosed. Alternatively a means for modifying a volumetric concrete batching and mixing system to achieve the same result is disclosed. A system is disclosed for defining a vertical or sloped concrete surface utilizing a movable beam attached to guide elements with sliding brackets, with the beam contact surface optionally having an active non-stick system.

A dry composition formulated to be combined with water to form a jamb spray mix, the dry composition comprising, by weight: 0.1% to 10% phosphate by weight based on total weight of the dry composition; 5% to 15% plasticizer by weight based on total weight of the dry composition; and the balance including fused silica particles and impurities.

The present invention concerns an additive for construction chemical compositions, in particular mortar and cement compositions. The additive comprises at least one amide or ester of a sugar acid and at least one water-soluble comb polymer which contains, on the main chain, acid functions and side chains having ether functions. The additive is useful for retarding the hardening of a construction chemical composition.

The aim of the invention is to provide a novel construction system for buildings, having the properties of being multilayer, insulating, ductile, and lightweight.

To this end, the invention relates to a multilayer insulating construction system for a building, characterized in that (a) this system comprises at least one wall associated with at least one hardened insulation layer, (b) the maximum thickness of the hardened insulation layer is between 1 and 60 cm, (c) the hardened insulation has a bulk density (BD) in kg/m.sup.3 that is less than or equal to 450; 300; 250; 200; 150; 100; and more preferably between 50 and 300; 150 and 250; (d) this hardened insulation layer is prepared by mixing, with water, a dry composition (d) comprising: -A at least one binder including: -A1- at least one hydraulic or air binder; -A2- possibly at least one water retention agent -A3- possibly at least one surfactant;
-B- at least one bio-sourced aggregate based on sunflower stalk and/or corn stalk and/or rape stalk, having a Bulk Density(BD) in kg/m.sup.3 that is less than 110; preferably between 10 and 80; (e) this composition having a ratio of A/B [mass of dry binder -A- in kg]/[mass of dry filler -B- in kg] comprised between 1 and 10.

Another object of the invention is the dry composition which, after mixing with water, enables manufacturing the hardened insulation layer of this construction system. The invention also includes the method for manufacturing the construction system.

A soil stabilization method of forming an admixture of at least one hydrogel precursor and urease enzyme, and contacting at least a portion of the admixture with soil, and forming a hydrogel network in-situ within at least a portion of the soil, wherein at least a portion of the hydrogel network includes in-situ precipitated calcium carbonate. In some embodiments, at least a portion of the hydrogel network is formed in-situ by polymerizing the at least one hydrogel precursor in the presence of the urease enzyme.

The aim of the invention is to provide a novel construction system for buildings, having the properties of being multilayer, insulating, ductile, and lightweight. To this end, the invention relates to a multilayer insulating construction system for a building, characterized in that (a) this system comprises at least one wall associated with at least one hardened insulation layer, (b) the maximum thickness of the hardened insulation layer is between 1 and 60 cm, (c) the hardened insulation has a bulk density (BD) in kg/m.sup.3 that is less than or equal to 450; 300; 250; 200; 150; 100; and more preferably between 50 and 300; 150 and 250; (d) this hardened insulation layer is prepared by mixing, with water, a dry composition (d) comprising: -A at least one binder including: -A1- at least one hydraulic or air binder; -A2- possibly at least one water retention agent -A3- possibly at least one surfactant;
-B- at least one bio-sourced aggregate based on sunflower stalk and/or corn stalk and/or rape stalk, having a Bulk Density(BD) in kg/m.sup.3 that is less than 110; preferably between 10 and 80; (e) this composition having a ratio of A/B [mass of dry binder -A- in kg]/[mass of dry filler -B- in kg] comprised between 1 and 10. Another object of the invention is the dry composition which, after mixing with water, enables manufacturing the hardened insulation layer of this construction system. The invention also includes the method for manufacturing the construction system.