4070.2      Lightweight Concrete and Aggregates  (ASTM 169C Chapter 46, 2006 
                          (T.A. Holm and John P. Ries)                                                              
                          Excellent overview of the complete subject. (ASTM 169D )
                          For a free copy of Chapter 46 in the USA and Canada contact ESCSI at
                                         info@escsi.org
                                         All others please contact astm.org