"This Guide updates and expands the scope of the committee report ""Guide for the Protection of Concrete Against Chemical Attack by Means of Coatings and Other Corrosion Resistant Materials@"" which appeared in the December 1996 ACI JOURNAL. The previous Guide has been revised and is found in Chapter 6 of this Guide entitled ""Protective Barrier Systems."" In addition@ there are new chapters on ""Waterproofing Barrier Systems@"" ""Dampproofing Barrier Systems@"" and ""Decorative Barrier Systems."" A separate chapter on conditioning and surface preparation of concrete is included because it is relevant to all the other chapters."