For grading and concrete

In addition to concrete pump capacity on the characteristics of the pump itself, but also with concrete grading relevant. a. cement content related to unit cement content will directly affect the concrete pipeline pumping resistance. In general, the fewer pipeline pumping cement content greater the resistance, the lower pumping capacity. Stationary conacrete plant lowest unit of pumping concrete cement content of about 200kg/m3. To ensure the quality of concrete pumping, unit cement content is best kept in the range of 280 ~ 300kg/m3, lightweight aggregate concrete cement content of between 310 ~ 360kg/m3. China provides the minimum amount of cement is pumped concrete 300 kg/m3. The lower the slump and slump, the concrete processing unit, the less water, concrete, when the tube through the pump body, the greater the resistance, directly affects the pumping capacity. In general, concrete mixer machine concrete slump 5 ~ 10cm, which for pumping more difficult. Will be controlled at 8 ~ 18cm slump is more appropriate, in the upper part of high-rise buildings will be even bigger slump, which not only improves the pumping capacity, and reduce tube clogging.