Deductive method of hardened concrete mixing ratio

The invention relates to a deductive method of hardened concrete mixing ratio, comprising the following steps of: measuring the saturated surface dry mass of a concrete block, measuring the mass of the concrete block after drying; breaking the concrete into a plurality of small blocks, quickly cooling the small concrete blocks after heating, crushing the small concrete blocks for the first time, screening the crushed material, measuring the dry mass of the unscreened part; measuring the dry mass of the screened part; crushing the dry material of the screened part for the second time to form a test sample; weighing the dried test sample; weighing the powder mass after calcination and obtaining the ignition loss of the powder sample by calculation, weighing the dried test sample, adding hydrochloric acid into the sample, filtering the mixture after stirring, calcining the residue, weighing the powder mass after calcination, obtaining the mass of undissolved substances in the powder by calculation; and calculating the mixing ratio according to formula. The method has the advantages of short operation time, low energy consumption and high precision.