PDF Coat of Arms. + Extended History. The surname MacK was first found in Berwickshire where they held a family seat from early times and their first records appeared on the census rolls taken by the ancient Kings of Scotland to determine the rate of taxation of their subjects.
Common rebar is made of unfinished steel, making it susceptible to rusting. As rust takes up greater volume than the iron or steel from which it was formed, it causes severe internal pressure on the surrounding concrete, leading to cracking, spalling, and ultimately, structural failure.
According to the surface pattern of the rebar, it can be classified into plain rebar and deformed rebar as follow: Plain rebar: It is typically a round rod without repeating patterns of ridges and depressions on its surface. They are often used in situations where the rebar sections need to slide, such as the highway pavements, which are easy to subject to the weather induced expansion and cracking.