Abstract: It is a method of treatment of support rods for the support of steel reinforcements in making aerated concrete, in which the support rods are first dipped into a hot bath of molten paraffin or a similar wax-like, waterproof material, which is solid at room temperature and has a softening temperature of about 50.degree. to 70.degree. C. Then the coating formed thereby is hardened by cooling. Then the steel reinforcements are suspended on the support rods and they, together with the support rods are coated with a corrosion protection medium in the form of a water-lacquer.

Abstract: Disclosed herein is a process for the production of steam hardened gas concrete which comprises producing an unprocessed mixture containing a binder consisting of lime and cement, at least one silicate containing aggregate and at least one calcium sulfate, and processing the mixture to form steam hardened gas concrete. At least a portion of the silicate containing aggregate and the calcium sulfate are mutually ground together during the process. A predetermined quantity of calcium sulfate is employed so that the total sulfate content (expressed as SO.sub.3) of the finished product is between about 2 and about 5% by weight based on the ignition loss-free dry weight.