Pumping Principle of Concrete

Pumped concrete is a type of viscous fluid product. Its characteristic is that it can roll under external pressure, however its yield worth is not zero. Under the activity of pumping stress of pump machinery, the concrete in the pipe rolls towards the beyond the pipe. A thin layer of cement mortar with reduced yield shear stress is based on the pipeline wall. Its return shear stress and anxiety is much smaller than that of the concrete, so the concrete in the pipeline rolls in the pipeline in its entirety. This layer of cement mortar is like a lubricant in between the concrete and the pipeline wall surface.

Compared to normal concrete, the concrete surface is prone to cracks, big contraction value and also various other troubles, which seriously influence the high quality of concrete, as a result of the big fluidness, big sand ratio, high concrete consumption, uneven vibration and other factors of pumping concrete.

Preventive Measures

Initially, on the premise of meeting the architectural demands as well as pumpability, control the water cement proportion as well as decrease the slump as high as feasible.

Second, add proper admixtures and also admixtures to improve the functioning performance of concrete.

Third, no separation, mortar leak, serious bleeding, too much temperature increase and depression loss will certainly take place during concrete transport.

Fourth, the totally free pouring height of concrete should not be greater than 1.5 m, or else, sluggish reducing steps ought to be taken to prevent accumulated splitting up.

Fifth, the concrete resonance shall be finished prior to the preliminary setup. During resonance, insert it swiftly as well as pull it slowly till the surface area is hemorrhaging without bubbles. The concrete with the very same stamina quality and tiny fragment size shall be used for pouring, and also the tiny diameter vibe will be utilized for resonance to ensure the density as well as harmony.

Finally, the concrete curing after pouring is mainly to maintain proper temperature and also humidity, decrease the thermal diffusion of the surface, decrease the temperature level difference of the concrete surface, and also avoid surface cracks. Within 12h after the completion of concrete pouring, cover the concrete with damp straw curtains, hemp flakes, etc, as well as focus on sprinkling for healing, properly prolong the treating time, and also guarantee that the concrete surface area cools gradually. In winter, concrete surface area shall be provided with safety procedures to stop cold wave strike.

Pumped concrete not just has the features of big communicating ability, quick rate, high performance, workforce saving, continuous operation, fast improvement of system task building progress, however likewise reduces the labor strength of workers, and significantly reduces urban environmental pollution and also noise cycle. It has good financial as well as social advantages as well as deserves promoting.