A method of producing conductive and/or translucent Portland cement which has high sulphate resistance and a service life of up to 70 years under normal service conditions. Once cement has set, light can pass therethrough. Up to 70% of the final resistance of the cement is reached within 48 hours of setting. The inventive production method is characterised in that it produces a fineness of more than 3450 cm2/g and in that, upon setting, the concrete has a mechanical strength of between 26 MPa and 250 MPa, without the addition of additives, thereby enabling a reduction in the water required to obtain a determined slump.