concrete cylinders volumetric efficiency

Concrete cylinder volumetric efficiency means that the piston stroke within the concrete mixing machine filling degree. Such as concrete cylinders were all filled with concrete mixture, then ? = 1.0. In fact ? slump concrete, piping conditions and concrete pump mechanical construction and so on. Large concrete slump, liquidity is good, easy to inhale concrete cylinders, volumetric efficiency will increase. When the
Piping upward, opening the distribution valve and closing the commutation moment because of back pressure (counter pressure) in the delivery pipe will produce concrete mix back, concrete block making machine of the concrete mixture, in particular when the dispensing valve wear, affecting more large. In addition, the concrete mixture from the hopper suction flow of concrete cylinders are reasonable, inhalation dispensing valve structure and its operating speed and the speed of movement of the piston also affected pit efficiency .