Question

The efficacy of pumpcrete is based primarily on

1. The capacity of pump

2. The aggregate size, which should not exceed 8 cm

3. The diameter of pipe being large, with more than 30 cm being desirable

4. The performance of the agitator
1. 1 and 4 only 
2. 1 and 2 only 
3. 3 and 4 only 
4. 2 and 3 only

Answer 1

Correct Answer - Option 1 : 1 and 4 only 

Efficiency of concrete pump depends on the following factors;

1. Length of horizontal pipe–300 to 400 m

2. Length of vertical pipe

3. Number of bends

4. Diameter of pipe line (150 mm – 200 mm)

5. Slump of concrete (> 75 mm)

6. Capacity of pump

7. Maximum size of Aggregate = 40 mm

8. Performance of Agitation