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 will select pump lubricants with excellent performance. 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 dissolve at room temperature. Crystallization or hardening will occur at room temperature, so hot water is required to completely dissolve it in winter. Generally, construction sites do not have the conditions to provide hot water, which will also affect the expected use effect of the lubricating agent.
Others, such as the lubricating agent solution, need to be insoluble in the concrete, because once the lubricating agent solution is miscible with the concrete, the water-cement ratio of the concrete will increase, and the strength will decrease. Decrease and reduce the mechanical properties of concrete. There are also good pump lubricant products with good adhesion. After flowing through the pipeline, they will leave a thin layer of mucous membrane on the inner wall of the pipeline to achieve the effect of lubricating the pump.
Commonly used evaluation methods are introduced as follows:
Check whether it affects the strength and setting time. Usually, 1% of the cementitious material can be added with dissolved lubricating agent to test whether the lubricating agent solution affects the strength and setting time of the concrete. A lubricant that does not affect strength and setting time is a good lubricant.
Check solubility. Take 500 grams of water at about 5 degrees Celsius, and take 5 grams of lubricant. Stir for 1 minute, stop for 3 minutes, stir again for 1 minute, and check whether the lubricant is completely dissolved and whether it is agglomerated. A good lubricant can be completely dissolved and transparent.
Check the lubrication ability. Take a 20cm section of steel pipe with a diameter of 125mm and seal one end with a steel plate. Pour the prepared lubrication solution into it and pour it out in the shortest possible time. Weigh the quality of the lubricating agent hanging on the wall. It is better to have a larger amount hanging on the wall. Scrape the pump with your fingers. It is better if it has obvious lubrication.
Check the insoluble properties of concrete. Take 200ml of the prepared lubricant liquid in a transparent beaker, take a concrete slurry with a slump of more than 220mm, about 1cm thick, stir vigorously with a glass rod for 1 minute, it is better if the concrete does not dissolve into the lubricant liquid.
Check environmental friendliness. Pump lubricant should be nontoxic and odorless. Take 50ml of the prepared lubricating fluid and place it on the outdoor cement floor, and check whether it is completely degraded within a week. A good lubricant can be completely degraded without leaving any residue.
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