Sprayed concrete, or shotcrete, as is the accepted term in North America, has become an integral part of many traditional, nonmechanized (that is, drill and blast, roadheader) tunnel excavations.
Sprayed concrete, or shotcrete, as is the accepted term in North America, has become an integral part of many traditional, nonmechanized (that is, drill and blast, roadheader) tunnel excavations.