- The Tu-144 supersonic transport was the fastest commercial jet plane at Mach 2.35 (1,555 mph, 2,503 km/h). It went into service in 1975, but soon stopped flying. The Mach 2 Concorde aircraft entered service in 1976 and flew for 27 years. - Wiki â Mark Mayo â¦ Apr 6 '13 at 21:39
There are several ways to address expansion joints and cracks as a result of shrinkage. The most obvious way to fill expansion joints is to fill the joint with a flexible joint sealant.The most cost effective joint sealants are usually single component urethane joint sealants. The may be supplied in caulking tubes or in bulk packaging.he most obvious way to fill expansion joints is to fill the joint with a flexible joint sealant. The most cost effective joint sealants are usually single component urethane joint sealants.
Break larger pieces using a sledgehammer or electric jackhammer. Once there is a wide enough gap to avoid damaging the concrete you wish to keep, you can use the methods detailed for removing a whole slab. 1  Use a pry bar as you go for the quickest and most effective results. Only use a chisel point bit to break up concrete. 2  This concentrates force for the best results. 3  Let the weight of the machine do the job; it's not necessary to add force by pushing down. 4  Forcing the bit will cause damage to the machine and possibly wedge the bit.