Benefit Analysis and Application of Concrete Pumping Agent

Pump lubricating agent is a new product currently appearing on the concrete market. Its main function is to lubricate the pipes of the pump truck before pumping ready-mixed concrete to avoid clogging of the pump. In the past few decades, the ready-mixed concrete industry across the country has been using water and mortar to lubricate concrete pumps. The result is neither economical nor in line with the current concepts of low-carbon environmental protection, energy conservation and emission reduction. The successful development and application of concrete pump lubricant (also known as concrete pipe lubricant) has made a positive contribution to the low-carbon, energy-saving and emission reduction of the concrete industry. This article mainly introduces systematically the comparison between lubricating agent and mortar lubricating agent, as well as the characteristics, use and evaluation methods of lubricating agent products.

1. Comparison between pump lubricant and pump mortar

1.1 For traditional pump mortar, concrete companies need to invest manpower and material resources to produce it. In the current shortage of cement and sand resources, it is actually a big waste to still use these raw materials to produce pump mortar. In addition, generally a pump lubrication requires at least 1 cubic meter of lubrication mortar. For ground pumps with long pipelines, sometimes 2 to 3 cubic meters of lubrication mortar are needed to lubricate the pump. These raw materials require cash settlement. , and it is also a very large expense for concrete production companies when concrete products require advance financing. The lubricating agent is made of a variety of polymer materials. At room temperature, it can be quickly dissolved within 3-5 minutes by mechanical or manual stirring, and form a transparent and stable viscous liquid. The lubricating agent While the dissolved liquid passes through the pipe as a whole, part of the pump solution adheres to the pipe, thereby achieving the function of lubricating the pump pipe. Moreover, the pump solution and the concrete do not dissolve each other, so it will not affect the various properties of the concrete. It is also very convenient to use. There is no need to add any other equipment or a separate lubricating pump. The lubricating pump fluid goes in front of the concrete and can be carried out at the same time as the concrete pumping, which greatly saves the expenditure of manpower and material resources.

1.2 Traditional pump mortar sometimes needs to be transported by a separate transport truck; sometimes the pump mortar is placed on the upper part of the concrete mixer truck and the concrete is loaded on the lower part. This is not only a waste of vehicle use, but if the transport truck loaded with pump mortar and concrete at the same time cannot rotate during transportation, otherwise the concrete and mortar will be mixed together. If the road is long or the concrete workability is slightly poor, it will If the workability does not meet the requirements, it will be returned. In addition, the first truck of concrete after the pump cannot be rotated during the road, resulting in poor workability, and it is also easy to cause the pump to become blocked. The use of lubricating agent is very convenient. Generally, only 2 to 3 bags of lubricating agent are needed at one time, each bag is about 300g. Therefore, many mixer truck drivers take a few bags and put them in the car before setting off, so that they can quickly and easily lubricate the pump. Pump Purpose.

1.3 Since the strength level of pump mortar is different from that of concrete, it is generally mainly used for pump lubrication and has little other uses. Some construction units use pump mortar in places that do not require high strength, such as floors. Ping, construction site ground, etc. The cost of pumping mortar is a huge waste if it is paid by the concrete company or the construction unit. At the same time, pump mortar also brings some quality hazards. In the past, there have been serious quality accidents in some construction sites where pump mortar was used for structural parts, resulting in unqualified project acceptance and final demolition.

1.4 Comparison of lubricating pump performance. The lubricating effect of some better quality lubricating agents is better than that of lubricating pump mortar. The lubricating pump mechanism of mortar is to use the small friction of the lubricating pump mortar to pass through the lubricating pump. When piping, some cement slurry will adhere to the pipe wall, and this cement slurry will lubricate the concrete transported later. Based on this principle, the lubricating agent is composed of polymer materials. After lubricating the pipe, the lubricating agent is a thin film that adheres to the pipe wall. The lubricating ability of the layer is significantly better than that of pump lubricating mortar. Through experiments and verification in some places after using pump lubricants, the probability of pump clogging has been reduced a lot. In the process of promoting the use of pump lubricants, our company has not found any pump trucks that have pump clogging after use.

2. How to judge the performance of pump lubricants

There are also some pump lubricant products on the market, but some products are of varying quality and cannot achieve the pump lubricating effect well. The following is a list of pump lubricants with excellent performance. Select a method for analysis.

First, check the solubility. A preliminary judgment is made based on the color after dissolution. The pump lubricant product with better performance will be transparent in color after being dissolved in the beaker, while some lubricant products with poor performance will appear turbid or white insoluble matter after dissolution. Therefore, , once the concrete is pumped, it will be difficult to see the boundary between the pump solution and the concrete, causing unnecessary waste.

Secondly, the performance of the lubricating agent can be tested from the solubility. A good lubricating agent dissolves completely at room temperature, while some poor quality lubricating agents will crystallize or harden at room temperature. Therefore, in winter it is necessaryADDING-LEFT: 7px; PADDING-RIGHT: 7px; BORDER-TOP: #f0f0f0; BORDER-RIGHT: windowtext 1px solid; PADDING-TOP: 0px" valign="top" width="197">

2 bags

60±5kg

100-200 meters

3-4 bags

140±10kg

When using a truck pump to pump concrete, slowly pour the diluted lubricating water solution along the inner wall of the pump truck hopper (you can also directly put water in the hopper to dilute the pumping agent). Then slowly unload the concrete into the hopper from the other side of the pump pipe feed inlet. When the concrete covers the delivery pump feed inlet, pressurized pumping can begin. Try to allow all the lubrication solution to flow at the front end of the concrete pipe.

When using a ground pump to pump concrete, in order to prevent residues from remaining in the pump pipe, you should first pump 100 kilograms of water to clean the pipe, and then follow the above operations after the water in the hopper and pipe is empty. Step pumping. When using a lubricating agent to lubricate the pump, be careful not to pour the solution discharged after lubrication into the concrete structure.

When using it normally, you need to pay attention to:

1. When the temperature is very low, the dissolution rate of the lubricating agent may be reduced, and the stirring time should be appropriately extended. The best direction Stir for 1 minute, stop for 3-5 minutes, then stir for 1 minute.

2. When using a ground pump, you can pump water first, clean the pipes, and empty them. After 15 minutes, the cleaning water should be completely drained, and then try pumping the pump lubricant. Since the ground pump is usually made of concrete with a large slump, it is recommended that the water consumption should be appropriately reduced by 20% and the mixing time should be extended by 2 minutes. When calculating pipeline consumption, an increase of 20% should be made.

3. Application effect analysis

“Yulong” brand high-efficiency pump lubricant has achieved good results after being applied in Nanjing and some other provinces and cities. In the initial stage, some concrete companies only used it in truck pumps. After believing that the lubricating effect of pumps was better than that of mortar, they began to promote the use of lubricating agents in ground pumps. As long as you master the correct usage method and choose regular brands of lubricating agents, you can It can achieve good pump lubrication and cost saving effects. After calculation, the annual output of a general concrete enterprise is calculated as 300,000 cubic meters, which can save nearly one million yuan per year. At the same time, the use of lubricating agents also reduces the amount of cement, sand and other raw materials used by concrete companies, which plays a very positive role in the low-carbon emission reduction of the entire industry. </p