The continuous improvement of the performance of concrete admixtures has created conditions for innovation in concrete mixing, transportation and pouring processes. From dry concrete to fluid or even high fluidity concrete, the transportation of concrete has realized the transformation from the initial manual pushing or hoisting to mechanical pumping, which has greatly promoted the rapid development and expansion of concrete projects. Most high-performance concrete construction uses pumping technology. Choosing a good concrete pumping agent is a crucial factor. What are the performance of concrete pumping agents? In order to help everyone understand better, let’s learn about it together.
Pumping concrete requires the concrete to have greater fluidity and maintain this performance for a long time, that is, the slump loss is small, the viscosity is good, and the concrete does not segregate or bleed. To achieve this, it is not enough to adjust the concrete proportion alone, but must rely on concrete admixtures, especially concrete pumping agents. It is difficult for a single-component admixture to meet the performance requirements of pumped concrete. Commonly used concrete pumping agents are composite products of multiple admixtures.
Five-step introduction to the performance of concrete pumping agents:
① Natural and synthetic water-soluble organic polymers, these admixtures can increase the viscosity of the mixing water. Such substances include cellulose ester, ethylene oxide, alginate, carrageenan, polyacrylamide, hydroxyethyl polymer and polyvinyl alcohol.
② Water-soluble organic flocculants adsorbed on the surface of cement particles increase the viscosity by promoting mutual adsorption between particles. Such substances include styrene copolymers with carboxyl groups, synthetic multi-element electrolytes and natural water. sol.
③Various organic substances can improve the mutual adsorption force between particles, and at the same time provide supplementary ultra-fine particles in the cement slurry. Such materials include paraffin emulsions, polypropylene emulsions and other polymers.
④ Inorganic materials with large specific surface area, these materials can improve the water retention capacity of concrete mixtures. Such materials include fine diatomaceous earth, silica fume, asbestos powder and other fibrous materials.
⑤Inorganic materials, these materials provide supplementary fine particles to the mortar body. These materials include fly ash, kaolin, diatomite, untreated or calcined volcanic ash materials and various stone powders, etc. .
In summary, this article introduces the performance of concrete pumping agent in five steps, hoping to help you.
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