Pump and pipeline method :-It is the most sophisticated method particularly suitable for limited space or when a large quantity of concrete is to be poured without cold joints. Pumping of concrete can be done @ 8 to 70 m/hour and vertical distance of 90m. Pipe diameter is generally 8 to 20 cm but not more than 30 cm. The workability of pumped concrete should be minimum of 40 to 100 mm of slump and compacting factor of 0.90 to 0.95. The water cement ratio of concrete is kept between 0.5 to 0.65.