author: construction technology laboratories portland cement association

... ACI 234R - 96 , Farmington Hills , MI ( 1996 ) , 51 pp . 9. Powers , T. C. ... ACI Materials Journal , Vol . 86 , No. 2 ( March - April 1989 ) , pp . 139–144 ... 503R - 93 , ACI Manual of Concrete Practice - Part 5 , American Concrete ...