What's the conveyor pump on the concrete requirements? www.heajee.net

① The maximum diameter of coarse aggregate and the ratio of pipe diameter should be: pumping height below 50m, for gravel should not be greater than 1: 3, for gravel should not be greater than 1: 2.5; pumping height of 50 ~ 100m , Preferably in the range of 1: 3 ~ 1: 4; pumping height above 100m, should be between 1: 4 ~ 1: 5. Needle-like particles content should not be greater than 10%.

② For different pumping height, into the pump concrete slump can be (as shown in the table) selection.

Pumping height (m) 30 or less 30 to 60 60 to 100 100 or more

Slump (m) 100-140 140-160 160-180 180-2200

③ Pumping concrete water-cement ratio should be (0.4 ~ 0.6): 1.

④ pumping concrete sand content should be 38% to 45%. Fine aggregate should be used in sand, sand through the 0.315m sieve should not be less than 15%.

⑤ The minimum content of cement in the pumped concrete is 300kg / m3.