- 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.
Various materials can be used. Sand is the easiest to work with, though small stones or gravel are also acceptable options. You can also use concrete provided it doesn't get squeezed out by the pressure of the slab. Place a sheet of plastic under the slab over the wet concrete before lowering the slab. This will keep the new cement from sticking to the slabâ¦ just in case you have to relevel it sometime in the future. Some long slabs, such as those used for concrete walks, are made in a single pour.