A fresh concrete composition for producing a magnetizable concrete, including 250-450 kg/m.sup.3 of cement, 50-150 kg/m.sup.3 of a mineral addition, 2900-3500 kg/m.sup.3 of aggregates containing magnetizable particles, and 100-150 kg/m.sup.3 water, wherein the sand volume is 60 vol.-%.

A curable concrete composition includes a curable cementitious material and a plurality of magnetic nanoparticles (MNPs) dispersed in the curable cementitious material, wherein the MNPs generate heat upon application of an electromagnetic field to the composition effective to reduce cure time of the curable concrete composition, and/or enhance mechanical strength and/or durability of a cured concrete composition formed from the curable concrete composition.