There are several major problems with using pumping for concreting works. Pumping can cause segregation of the aggregate and the mortar, leading to decreased strength and durability of the concrete. Pumping can also cause entrainment of air in the concrete, which leads to decreased compressive strength and increased permeability. Finally, pumping can cause a decrease in the workability of fresh concrete, leading to less-uniform mixes and an increased incidence of defects.

The main disadvantages of using pumping for concreting works are as follows: - Pumping is very expensive and requires a lot of energy, so it is not suitable for large-scale projects. - It can be difficult to control the flow of concrete with a pump, so there is a risk of producing inconsistent results. - There is also a risk of air pockets forming in the concrete if it is pumped over long distances.