- 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.
If you choose to use the sand-packing method, you will need to buy sand and concrete patching compound, preferably with a latex additive for flexibility. Pour in a layer of sand to help fill the cracks, then apply the patching compound on top of it with a trowel.Smooth the surface quickly, and feather the new surface into the existing edges for a finished look.or small cracks, such as those that are about 0.125 inch (about 3 mm) wide, start by using a screwdriver to chip away any flakes or loose concrete. Scour the cracks with a wire brush to remove any dirt and debris. Rinse the area using a hose or a bucket of water.