There are numerous advantages to using the shotcrete process. The economical sustainability of shotcrete include material, labor, and time savings as well as improved quality. On top of the following "top ten" sustainability advantages of shotcrete, the American Shotcrete Association's Sustainability's page offers the following:
Although both wet and dry shotcrete have specific benefits, advancements in both equipment and material have made the applications almost interchangeable. In most applications, the preferred method is determined by:
In most concrete, aggregates are generally inert. However, some aggregates react with the alkali hydroxides in concrete. This reaction causes expansion and cracking over a period of many years. This alkali-aggregate reaction has two forms: alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR).
Alkali-silica reaction (ASR) is more serious because aggregates containing reactive silica materials are far more common. Typically, indicators of ASR are random map cracking. However, in advanced cases, you will experience closed joints and attendance spalled concrete.