Pump concrete is a kind of concrete mixture with a slump no fewer than 100 ㎜ and it can be delivered by concrete pump through the pipeline. It should have a better flowability and the aggregate size is usually not more than the quarter of the pipe diameter. You also need to add some pumping agents to prevent concrete mixtures from segregating and blocking in the pumping pipe, and you also need to add other additives to aid the mixtures to pass the pipe smoothly under the pumping pressure. Water reducing agent, plasticizing agent, air-entraining agent and thickening agent all can be used as pumping agents. In addition, adding moderate amounts of fly ash also can prevent pump concrete mixtures from segregating, water bleeding and pipe blocking.
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