When training on new equipment, after-sales training personnel will mention that before the concrete pump truck can officially pump concrete, 1-2 cubic meters of mortar with the same gel ratio as the concrete being pumped is needed to moisten the pipe. In this way, the resistance of the inner wall of the pump pipe of the pump truck to the concrete is reduced and the pumping efficiency is improved.
The main component of the lubricating agent currently used in mainstream pump trucks is polyacrylamide, which is a water-soluble linear polymer polymerized from acrylamide monomers. It is usually a white powdery solid. It can quickly dissolve in water to form a viscous liquid at room temperature. Because the structural unit of polyacrylamide contains amide groups, it is easy to form hydrogen bonds, making it have good water solubility and high chemical activity. It is easy to obtain branched or network structures through grafting or cross-linking, and has extremely strong flocculation. effect.
When concrete pump trucks use lubricants, they often encounter such a problem. For example, when the first truck of concrete is pumped, due to the cohesiveness of the concrete itself, the cement and cement in the concrete will The gel material formed by water sticks to the inner wall of the pump pipe, thereby affecting the quality of the concrete. It will also cause greater resistance to the concrete in the pump pipe, affecting construction efficiency, and sometimes causing pipe blockage problems. .
This is mainly because when its concentration is high, there are a large number of chain-to-chain contact points in the solution, making the polyacrylamide solution gel-like. This gel-like liquid is composed of countless microscopic The lubricating film composed of anions can be used to lubricate the inner wall of the pump pipe of the pump truck, effectively reducing the resistance of the pipe wall to concrete by more than 50%-70%. Compared with traditional mortar, the pipe lubrication effect is better. Therefore, it is recommended that when customers choose lubrication products, they should choose polyacrylamide lubrication agents as much as possible instead of taking the edge and choose less commonly used lubrication agents.
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