The present application relates to a concrete pre-mix composition comprising a cementitious material and a plurality of conductive carbon microfibers mixed with said cementitious material, where said conductive carbon microfibers are present in the concrete pre-mix composition in an amount such that, when said concrete pre-mix composition is hydrated to form concrete and cured, the conductive carbon microfibers are dispersed in the cured concrete in an amount of 0.75% to 2.00% of total mass of the concrete. The present application further relates to a concrete composition, a method of producing an electrically conductive concrete composition, an electrically conductive cured concrete form, and a system for heating pavement.

A dry construction composition that is easily wet-sprayed by a screw pump to form an insulating and mechanically resistant material after hardening comprises: at least one binder that includes at least one primary binder comprising lime and/or at least one source of alumina and/or at least one source of calcium sulfate, at least one water retention agent, and preferably at least one surfactant; and at least one plant-based bio-based filler 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. The ratio of the binder to the filler is between 2 and 9 in liters/kg. The composition can be mixed with water in a ratio of water/binder that is greater than or equal to 0.8 to form a wet composition. The wet composition can be sprayed onto a horizontal or vertical substrate or molded to a desired shape.

A hydraulic composition including water; a hydraulic binder; at least one setting retarder; and at least one polysaccharide; the weight ratio of the water/hydraulic binder being greater than 1.5, methods of using the composition as a mixture in a grout and a corresponding method for preparing a grout and the grout thereby obtained.

A hydraulic composition including water; a hydraulic binder; at least one setting retarder; and at least one polysaccharide; the weight ratio of the water/hydraulic binder being greater than 1.5, methods of using the composition as a mixture in a grout and a corresponding method for preparing a grout and the grout thereby obtained.

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.

The present invention provides dry mix compositions for use in making gypsum plasters or mortars comprising gypsum, preferably, phosphorous gypsum one or more retarder, and one or more crosslinked cellulose ethers containing polyether groups. The compositions enable the provision of gypsum dry mixes, such as those from phosphorus gypsum, that make gypsum mortars with less stickiness while reducing the amount of cellulose ether in the dry mix.

The present invention relates to a powder adhesive composition comprising: (a) cement; (b) a dispersible polymer powder; and (c) at least 10% volume of the powder adhesive is an expanded perlite; wherein said cement is at a ratio of between 600-1000% of the mass of the expanded perlite; and wherein the powder adhesive composition is an adhesive, and the adhesion strength of the adhesive, is over 0.4 MPa, after 28 days, and after water immersion for at least 20 days.

A water-reducing composition is obtained by a method for preparing the water-reducing composition, the method including stirring a water-reducing agent, a water-soluble cellulose ether, a gum and a defoamer by a high speed stirrer, in which the water-reducing agent has a solid component concentration of 10 to 25% by weight and an Na.sup.+ ion concentration of 8,500 ppm or higher, and in which a stirring element in the high speed stirrer has a peripheral speed of 8.50 m/s or higher, and the water-reducing composition has a sedimentation volume of 80% by volume or higher after being left standing for 72 hours from immediately after preparing the water-reducing composition, or being dispersion.

A hydraulic composition is prepared by mixing (A) an admixture aqueous solution containing a water-soluble salt which is a water-reducing agent or setting retarder, and a water-soluble cellulose ether with (B) a fresh concrete composition containing a hydraulic substance, an aggregate, and water at job site. The method is effective for preventing the admixture solution from thickening even though the water-soluble cellulose ether without glyoxal treatment is used.

A powder adhesive composition having cement, a dispersible polymer powder; and at least 10% volume of the powder adhesive is an expanded perlite. The cement is at a ratio of between 600-1000% of the mass of the expanded perlite. The powder adhesive composition is an adhesive, and the adhesion strength of the adhesive, is over 0.4 MPa, after 28 days, and after water immersion for at least 20 days.