This technology relates to a lubricant, in particular to a concrete pumping lubricant and its preparation method and application, and belongs to the technical field of building materials.
Background technology:
For a long time, ready-mixed concrete must be Use mortar to moisten and lubricate the conveying pipeline to ensure the smooth flow of the conveying pipeline. The mortar required for this method must be transported to the construction site by vehicle. In this way, every time a new construction site is reached, the mixing station must send a concrete transport truck to the construction site. Transporting mortar inevitably causes a lot of waste during transportation. Generally, each pump needs to be replaced at 45 construction sites a day, and the supporting mortar transport truck needs 810 trips. This not only reduces the utilization rate of the concrete transport truck, but also increases the transportation cost.
In order to save vehicles for transporting mortar, some concrete mixing stations also use the method of “carrying” the mortar on the upper part of the concrete transport truck after loading the concrete. This method saves mortar transport trucks, but often brings some negative consequences. Because, in order to prevent the mixing of mortar and concrete, the concrete transport truck with “backed” mortar cannot rotate during the driving process. The bumps along the way will cause concrete delamination, that is, the stones will sink and the cement slurry will float. This kind of When the concrete is transported to the construction site, if it is not fully stirred and pumped into the project, it will cause the shear wall and column concrete structures to be delaminated, and there will be few or even no stones on the upper part of the structure, resulting in project quality accidents; if the concrete is fully mixed, a lot of manpower and labor will be wasted. time.
In summary, since ready-mixed concrete must be wetted and lubricated before pumping, the pump trucks and pipelines must be wetted and lubricated. The concrete mixing industry has always used water and mortar to moisten pipes, which is costly, wastes materials and vehicles, and is not conducive to energy conservation. Technical content
In view of the shortcomings of traditional pipe moistening mortar in the above problems, this technology provides a method to wet the pipe and then use the pump The inner wall of the pipe is lubricated to reduce the frictional resistance through the pipe during concrete pumping and ensure smooth pumping; in addition, this technology also provides a concrete pumping pipe moisturizing agent that can fully mix the materials. The preparation method of the agent and the application method of the concrete pumping moisturizing agent in on-site construction.
In order to achieve the above purpose, the technical solution adopted in this technology is a concrete pumping lubricating agent, which is composed of stearate, thickener, solid It is composed of wax, polyethylene vinyl acetate, defoaming agent and calcium carbonate. The mass percentage of each material component is
stearate 30% 43%, Thickener 15% 20%, solid wax 17% 25%, polyethylene vinyl acetate 16% 20%, defoaming agent 0.5% 1%, calcium carbonate 4% 7%.
The mass percentage of each material component is stearate 42%, thickener 15%, solid wax 20%, polyethylene vinyl acetate 17% , defoaming agent 1<%, calcium carbonate 5%.
The mass percentage of each material component is stearate 32%, thickener 20%, solid wax M%, polyethylene vinyl acetate 19% , defoaming agent 0.7%, calcium carbonate 4.3%.
The mass percentage of each material component is stearate 37%, thickener 18.1%, solid wax 17%, polyethylene vinyl acetate 20%, defoaming agent 0.9%, calcium carbonate 7%.
Stearate is calcium stearate or sodium stearate or aluminum stearate or magnesium stearate or zinc stearate or stearic acid barium.
The thickener is hydroxypropyl methylcellulose ether or sodium carboxymethylcellulose or ethyl cellulose ether.
Solid wax is paraffin wax or natural wax. Defoaming agent is silicone defoaming agent or polyether defoaming agent.
Preparation method of concrete pumping lubricant, the preparation process includes the following steps
A .Weigh the above materials according to the proportion;
B. Mix the weighed materials in step A directly in the dry mortar mixer. Can be packaged.
The application method of concrete pumping lubricant is characterized in that when the concrete is transported to the construction site, the concrete pump is added to the container containing water as needed. Add the lubricating agent and stir the mixture with an electric mixer; the stirring is divided into two times, the first stirring time is 12 minutes, and the second stirring time is 23 minutes, so that the water and lubricating agent can be fully mixed. After mixing, pour it into the pump hopper, turn on the pump, unload the concrete, and start pumping.
The mass ratio of lubricant and water is 13 1350 1500.
There needs to be an interval of at least 2 minutes between the first stirring and the second stirring, so that there is a gap between each material of the lubricant and between each The reaction between materials and water can fully occur.
This technology has the following advantages. This product can replace the mortar used to moisten pipes without affecting the performance of concrete. It not only reduces production costs, but also has good effects. , saving water, vehicles and energy. Concrete pumping lubricants are mixed with a variety of functional polymers and surfactants to increase surface tension, increase viscosity, and improve adhesion.Simple. On the basis of wetting the pipe wall, lubricate the inner wall of the pump pipe to reduce the friction resistance through the pipe when pumping concrete and ensure smooth pumping. Concrete pumping lubrication agent has the advantages of being non-toxic, odorless, easy to decompose, not affecting the performance of concrete, and low cost, and can completely replace traditional lubrication mortar.
Specific implementation mode
The concrete pumping lubricating agent involved in this technology is made of hard Composed of fatty acid salt, thickener, solid wax, polyethylene vinyl acetate, defoaming agent and calcium carbonate (made by mixing). Among them, the mass percentage of each material component is as follows
Stearate 30% 43%, thickener 15% 20%, solid wax 17% 25% , polyethylene vinyl acetate 16% 20%, defoaming agent 0. 5% 1%, calcium carbonate 4% 7%
Among them, stearate It is calcium stearate or sodium stearate or aluminum stearate or magnesium stearate or zinc stearate or barium stearate; the thickener is hydroxypropyl methylcellulose ether or sodium carboxymethylcellulose Or ethyl cellulose ether; the solid wax is paraffin wax or natural wax; the defoaming agent is silicone defoaming agent or polyether defoaming agent.
The preparation method of the above-mentioned concrete pumping lubricant adopts the direct mixing method. First, the above-mentioned materials are calculated and weighed according to the proportion, and then the dry mixed mortar is mixed. Mix it evenly in the machine and then package it to obtain the concrete pumping lubricant.
The above-mentioned concrete pumping lubricant should be added to the container containing water as needed when the concrete is transported to the construction site. , stir the mixture with an electric mixer. The stirring is divided into two times. The first stirring time is 1.2 minutes, and the second stirring time is 2.3 minutes. The time between the first stirring and the second stirring is There needs to be an interval of at least 2 minutes to allow the water and lubricant to be fully mixed, pour it into the pump hopper, start the pump, unload the concrete, and start pumping. The mass ratio of lubricant to water is 13 1350 1500.
Example 1
The concrete pumping lubricating agent provided by this technology is made of water Made from a mixture of stearate, thickener, solid wax, polyethylene vinyl acetate, defoaming agent and calcium carbonate. Among them, the mass percentage of each material component is stearate 42%, thickener 15%, solid wax 20%, polyethylene vinyl acetate 17%, defoaming agent 1%, and calcium carbonate 5%.
Among them, stearate is calcium stearate, sodium stearate, aluminum stearate, magnesium stearate, zinc stearate or hard stearate. Barium fatty acid; thickener is hydroxypropyl methylcellulose ether, carboxymethyl cellulose sodium or ethyl cellulose ether; solid wax is paraffin wax or natural wax; defoaming agent is silicone defoaming agent or polyether Defoaming agent.
The preparation method of the above-mentioned concrete pumping lubricant adopts the direct mixing method. First, the above-mentioned materials are calculated and weighed according to the proportion, and then the dry mixed mortar is mixed. Mix it evenly in the machine and then package it to obtain the concrete pumping lubricant. </p
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