The amount of AAC aluminum paste needed for an AAC aerated concrete block depends on several factors, including the size and density of the block, the type of ACP used (e.g., ceramic or polymer), and the desired level of porosity. In general, however, it is recommended to use between 1-3 pounds of AAC aluminum paste per cubic foot of block. This can be adjusted based on your specific needs and calculations. It's always best to consult with a professional or refer to industry standards for more accurate information.