1927 till 1972

For the first time, cement shipments pass the mark of one million tonnes.
Change of the company name to Portland-Zementwerke Heidelberg Aktiengesellschaft. The Blaubeuren cement plant becames a group plant.
Severe bomb damage to various plants, especially in Mainz-Weisenau.
The plants are occupied by the Allies. The company, which had been placed under blocking of property by the American military command, is put under the administration of three trustees.

Entrance into the ready-mixed concrete industry, which is still young, by holdings in several small to mid-sized ready-mixed concrete companies.
Acquisition of a two-thirds interest in the transportation and freight forwarder, Kraftverkehr Bayern (KVB), Munich.
Holdings in the French cement company Vicat and Südbayer. Portland-Zementwerk Gebr. Wiesböck & Co. GmbH, in Rohrdorf, southern Bavaria.
Production start of concrete admixtures in Leimen, which by 1975 carry the trademark “Addiment”.