Abstract: This invention relates to a method of inhibiting alkali-silica or alkali-aggregate reactions (AAR/ASR) in concrete structures by introducing lithium compounds or the like in conjunction with conventional techniques for the treatment of steel reinforcement corrosion.It is also proposed to provide lithium compounds in repair concretes, grouts or mortars and use the difference in concentration between the article under repair and the repair material to introduce the lithium ions into the concrete under repair, once again inhibiting AAR/ASR reactions.

Abstract: A wall tie in a cavity wall is replaced by removing a masonry element from the outer leaf of the wall, gripping an exposed part of the wall tie, pulling the wall tie from the inner leaf, drilling a hole in the inner leaf, grouting a part of a replacement tie in the hole and then replacing the masonry element.