ABSTRACT
The descriptions of the AAR phenomenon and process, in the first two chapters, have been of an observational nature that is essential for diagnosis and also for understanding the AAR process and its superficial effects. For engineering decision-making, a quantitative knowledge of the effects of AAR as it progresses, as well as the extent to which it can be expected to progress, is required. In other words, quantity must be added to quality. There are two basic ways of acquiring this knowledge, each with its own size scale and appropriate timing in the course of an investigation. These are laboratory and field or in situ tests. Laboratory tests are usually performed on small specimens taken from full-size structures, whereas in situ tests are carried out on the actual structure. In an intermediate form of test, large components can be taken from a structure and brought into a laboratory to be tested.
