TABLE OF CONTENTS - The Professional Green Building Council

Theme C: Education and Market TransformationFigure 1: Raw material acquisition processes of pumice concrete blocks.3.2.2. Raw materials acquisition of AAC blocksInner materials used in aerated concrete block production are: sand, cement, lime,gypsum, aluminium powder and water. The other materials associated with blockproduction of the factory are timber pallet and polyethylene wrap for packaging.In the investigated factory all materials other than lime and cement are purchasedfrom outside manufacturers/providers. Lime is provided from company’s in-housedivision located at the same site, and it is directly taken from the lime productionfacility and is stored in block manufacturing silo. Cement is provided from a sistercompany which is also located at the same site. Aluminium powder, as the airvoids producing agent, is used in very small amounts in the mixture. It contains anenormous amount of energy, thus there is the risk of dust explosions and thereforeis classified as dangerous goods. In its production aluminium foil is grinded in theball mills and the flake obtained is filtered and stored in order the powder is to beoxidized. It is shipped from abroad, in this case from Sweden.645