This method makes use of a very simple and quick technique, which makes possible the determination of the different forms in which calcium is found in limes. The method is particularly useful for the evaluation of limes from the road engineering standpoint. The oxides and hydroxides are separated from the silicates and carbonates by several treatments with ammonium chloride in different conditions of temperature and time. The calcium of the different parts separated by this method is titrated with EDTA.