BEHAVIOR OF REPAIR LIME MORTARS BY WET DEPOSITION PROCESS

New repair mortars with biocide properties were subjected to acid rain wet/dry cycles in aggressive environment simulation chambers. Those m ortars based on lime had a sepiolite addition as a biocide support. Th e aim of this work was to determine the influence of both the clay and the biocide on mortar behaviour under aggressive solutions. The aggre ssive solutions used were the following: 1) H2SO4 solution, with pH = 4.5; and 2) ''acid rain'' solution with pH = 3.5. In the first case (H 2SO4 solution), neither the sepiolite nor the biocide had a significan t influence on mortar behaviour, while in the second aggressive medium (''acid rain''), sepiolite plus biocide, a decrease in the reaction b etween the mortar and the ''acid rain'' were noted. (C) 1998 Elsevier Science Ltd.