Method for producing high-strength inorganic cement articles

A method for producing a high-strength inorganic cement article, which comprises kneading under high shearing force a cement mixture containing by weight as essential components 100 parts of hydraulic cement, about 0.5 to about 15 parts of a hydrophilic, substantially adhesive organic binder and water, said binder being effective to promote adherence among cement mixture particles during said step of kneading under high shearing force;

• molding the resulting kneaded mixture to an article having a water-to-solid weight ratio of not more than about 0.2;
• preliminarily hydrating the molded article;
• firing the resulting hydrated article at a temperature of about 300.degree. to about 1000.degree. C.;
• and then hydrating the fired article, said high shearing forces and said binder being effective to minimize inclusion of air and excess water in said mixture during said kneading step to an extent sufficient to impact a pore size (50% median) of not larger than about 100 millimicrons and a porosity of not more than about 50% to the preliminary hydrated molded article formed in said molding and preliminarily hydrating steps.