Abstract: A mortar or cement composition is provided which is adapted for being mixed with water and thereafter set. The composition comprises cement mixed with iron oxide in a ratio of about 1:4. At least one admixture is added from a group consisting of functional water-reducer admixtures, thickener admixtures and defoamer admixtures. The functional water reducer admixture is used to increase the density of the mortar or cement without substantially retarding the setting thereof and without entraining substantial amounts of air. The defoamer admixture is added to reduce air content of the mortar or concrete and to increase the density thereof. The thickener is adapted to inhibit bleeding of water from the mortar or cement. The method of the invention involves making a mortar or cement composition which comprises adding to cement and iron oxide at least one admixture selected from the group consisting of functional water-reducer, thickener, and defoamer admixtures.