Method of producing a cement mortar with good stability in a fresh condition and a method using this mortar as a binding agent of producing a lightweight aggregate concrete with a high aggregate content

A method for producing a light aggregate concrete of density less than 1400 kg/m.sup.3 from a cement mortar comprised of cement, solid particles, and water and having finely distributed gas in the mortar in an amount sufficient to provide said mortar with a density of 1200-2000 kg/m.sup.3, and 45-80 percent by volume of a light aggregate material with a particle density of less than 1200 kg/m.sup.3 wherein the cement mortar entirely fills out the space between the aggregate particles which comprises initiating of distribution of said finely distributed gas in said mortar by incorporating prior to admixing said light ballast with said cement mortar 0.2-5.0 percent by weight based upon the amount of said cement in said mortar of a particle-shaped hydrophilic-hydrophobic balanced product chemically inert in relation to the rest of said mortar and consisting of substantially spherical hydrophobic particles of 0.1-1.0 .mu.m strongly adsorbed on the surface of which is a hydrophilic nonionic tenside in amount of 0.1 to 5.0 percent by weight based on the total weight of said product.

A method for producing a hardened cement mortar wherein the major portion of all pores thereof are 5-30 .mu.m containing cement, solid particles and water and having finely distributed gas in the mortar in an amount sufficient to provide said mortar with a density of 1200-2000 kg/m.sup.3 which comprises introducing into the mortar prior to setting thereof 0.2-5.0 percent by weight based upon the quantity of cement of a particle-shaped hydrophilic-hydrophobic balanced product chemically inert in relation to the rest of the mortar and consisting of substantially spherical hydrophobic particles of 0.1-1.0 .mu.m strongly adsorbed on the surface of which is a hydrophilic nonionic tenside in amount of 0.1-5.0 percent by weight based on the total weight of said product, and allowing the composition to harden.

A cement mortar comprising cement, solid particles, water, finely distributed gas in an amount to provide said mortar with a density of 1200-2000 kg/m.sup.3, and 0.2-5.0 percent by weight based upon the quantity of said cement of a particle-shaped hydrophilic-hydrophobic balanced product chemically inert to the rest of the mortar and consisting of substantially spherical hydrophobic particles of 0.1-1.0 .mu.m strongly adsorbed on the surface of which is a hydrophilic nonionic tenside in amount of 0.1-5.0 percent by weight based on the total weight of said product.

A light aggregate concrete of density less than 1400 kg/m.sup.3 from a cement mortar comprised of cement, solid particles, and water and having finely distributed gas in the mortar in an amount sufficient to provide said mortar with a density of 1200-2000 kg/m.sup.3, and 45-80 percent by volume of a light aggregate material with a particle density of less than 1200 kg/m.sup.3 wherein the cement mortar entirely fills out the space between the aggregate particles and 0.2-5.0 percent by weight based upon the amount of said cement in said mortar of a particle-shaped hydrophilic-hydrophobic balanced product chemically inert in relation to the rest of said mortar and consisting of substantially spherical hydrophobic particles of 0.1-1.0 .mu.m strongly adsorbed on the surface of which is a hydrophilic nonionic tenside in amount of 0.1 to 5.0 percent by weight based on the total weight of said product.