A lining mortar developed for applications in Civil Construction (new works, renovations and maintenance in general). The lining mortar composition comprises an inorganic filler in the form of aluminum silicate which has a wt % between approximately 20% and 38%. Other components can include an inorganic filler in the form of Hemihydrate which has a wt % between approximately 12% and approximately 30%. In addition other components include a binder in the form of an aqueous dispersion of acrylic-styrene copolymer having a wt % between approximately 4% and approximately 16%; and water having a wt % between approximately 34% and approximately 46%.