Fine stone concrete pump pumping concrete can improve the construction efficiency of floor heating and other projects, more convenient construction, but the fine stone concrete pump pumping concrete on cement and other requirements are also more strict, the following Qingke Heavy Industry to share with you the choice of aggregate.
The quality of pumped concrete has strict requirements for slump water-cement ratio and the selection of coarse and fine aggregates, so what is the choice of aggregate and sand rate? In the selection of aggregates, harmful impurities must be required to be low, and its own strength must meet the requirements. When selecting coarse and fine aggregates, its particle size mainly needs to meet the following conditions. The selected aggregate can not exceed three quarters of the small clear distance of the steel bar, nor can it exceed one quarter of the small structural plane length, its particle size mainly needs to refer to the inner diameter of the conveying pipe, the particle size is too large, will lead to the blockage of the conveying pipe, affecting the smooth progress of pumping.
Therefore, generally to pump concrete aggregate particle size can not exceed one-third of the inner diameter of the pump pipe, in the pumping of fine stone concrete, the role of mortar can not only fill the gap between the stones, but also play the role of lubrication, so in the pumping of concrete, it is necessary to match a suitable sand law, not only reduce the friction in the aggregate but also reduce the plastic viscosity. It also improves the water retention performance, allowing the concrete to achieve good pumping efficiency.
