Behaviour 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 mortars based on lime had a sepiolite addition as a biocide support. The aim of this work was to determine the influence of both the clay and the biocide on mortar behaviour under aggressive solutions. The aggressive 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 (H2SO4 solution), neither the sepiolite nor the biocide had a significant influence on mortar behaviour, while in the second aggressive medium ("acid rain"), sepiolite plus biocide, a decrease in the reaction between the mortar and the "acid rain" were noted. (C) 1998 Elsevier Science Ltd.