Concrete slump equipment installation is not reasonable and improper maintenance, but also will affect the slump of concrete. Its main performance is: pump car installation position is not reasonable, piping is long, elbow too much, so that the pumping resistance increases.

When other adverse factors are encountered, it is easy to make the concrete slump loss increase, the pipe is dry, and even the phenomenon of blocking the pump. Some are caused by improper maintenance of the pump wear is larger, which makes the pressure performance of the equipment worse, or the pipeline joint is not strict, wear and crack and water leakage slurry, resulting in concrete aggregate assembly, dry state, and even blocking pump. Clink this link for more details. 

There are also some human factors, such as concrete pump pipe is not cleaned up, there are concrete hard block residues, flow state concrete through the more difficult, aggregate blockage, pumping pressure increases when the slurry and aggregate separation, even if forced to pump out of the pipeline, but also for dry state, workability is very poor.