The Reasons of Concrete Pump’s Plugging
When the amount of cement used is too small and the sand ratio is too low, the workability of concrete is poor, the deformation is difficult, the frictional resistance in the pipeline is increased, and the pipe is easily blocked. When the concrete slump is too low (below 80 mm), the pumping resistance is significantly increased, making pumping impossible. The particle size of the sand is unreasonable. When the content of fine sand passing through the 0.315mm mesh hole is small, even if other technical specifications of the concrete meet the requirements, the pipe will be blocked. Because these fine sands play a ball-like role in concrete, it can reduce the friction between the pipe wall and the concrete, improve the flow ability of the concrete, increase the cohesive force and water retention, and have a great influence on the pump ability of the concrete. Therefore, Therefore, in JGJ/T10-95 "Technical Regulations for Concrete Pumping Construction", the sand passing through the 0.315mm sieve hole should not be less than 15%.
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