Conductive mortar

A method comprising:

• preparing a mixture including a binder composition comprising at least one binder and at least one mineral filler, and
• curing the mixture to produce a material having improved electrical conductivity at 20° C., wherein:
• the at least one binder comprises at least one epoxy resin and at least one hardener for the epoxy resin or at least one polyisocyanate and at least one polyol and is free of mineral binders,
• the binder composition comprises at least 85% by weight of the at least one mineral filler, based on a total dry weight of a dry binder composition,
• at least 60% by weight of the at least one mineral filler is iron-containing slag, and
• the improved electrical conductivity is present when the electrical resistance of the cured mixture is decreased by a factor of at least 1.5 compared to a cured material which has a same composition as the cured mixture but contains silica sand instead of the iron-containing slag whereby the silica sand and the iron-containing slag are of a same particle size, wherein the electrical resistance is a surface resistance measured according to AASHTO 95-11 or a volume resistance measured according to an electrochemical impedance spectroscopy (EIS) method.