Concrete Pump catch the bottom or compaction causes and solutions appear to send poor

1, causes

(1) does not comply with the ratio selection process of pumping concrete pumpworkability requirements.

(2) the amount of cement is low.

(3) sand and stone gradation unreasonable, porosity.

(4) is too small compared with the rate in the sand, the slump is too large,concrete machinery and easy segregation.

(5) serious bleeding prone to catch the bottom of the concrete or compacted (stick pan).

(6) a large amount of cement concrete is easy to catch the end of the phenomenon.

(7) concrete admixtures content easy to catch the end of a large concrete phenomenon.

(8) the sand is small, concrete prone to compaction phenomenon.

(9) high concrete water-reducing admixture, bleeding rate, water retention, thickening, air-entraining effect of poor concrete easy to catch the bottom or compaction phenomenon.

2, Solutions

(1) reduction of unit water consumption.

(2) increase the rate of sand.

(3) adding an appropriate amount of admixtures such as fly ash, to reduce the amount of cement.

(4) reducing concrete admixture content.

(5) increase in concrete admixtures entraining, thickening, water retention function.