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It is understood that commercial concrete pumping agent is applied, there are still many technical difficulties, experience tells us that the variability of the composition itself, pumping agent complexity, other raw materials, concrete, concrete pumping agent is not enough technical staff knowledge of the application technology is still not mature enough and other factors may cause difficulties in pumping agent applications. Specifically, commercial concrete pumping agent in the application of technology in existence less difficult.
1. concrete water rates and paste fluidity, mortar water reduction of relationship is not close
In construction, usually rapid testing, concrete mixing station generally be applied grout mortar fluidity and water reduction to evaluate the performance of pumping agent products. However, it should be noted that the pumping of products, especially by superplasticizer compound from the pumping agent, between its water reduction in concrete and cement paste fluidity, mortar, water reducing rate relationship is not close. This is commonly paste fluidity and mortar water reduction superplasticizer performance evaluation approach has challenges.
2. no closer than the compressive strength of concrete pumping agent relationship between water rate reduction
Considerably more complex than the compressive strength of concrete and water pumping agent relationship between the rate of reduction, usually as a result of pumping air-entraining agents of different different different possible pumping another agent active groups, free ions, etc. These factors that may have different effects on the cement hydration process.
3. concrete slump retention maintaining a sexual relationship with the paste fluidity is not close
It should be noted that, mixed with some kind of pumped agent paste fluidity within 1--2 hours to keep it well, but because of concrete slump loss very quickly, and some pumping agent in spite paste performance is not very good, but there is a very good performance in the concrete, which makes it seem difficult to apply pumping agent.
