Mud inhibitors can effectively reduce the adsorption of mud and stone powder to water-reducing agents and improve the workability of concrete when the mud and stone powder content are large. It is a surfactant. It has a large amount of charge and can be preferentially adsorbed on the surface of soil and stone powder particles, neutralizing the charge on the surface of the soil, thereby reducing the adsorption of the water-reducing agent by the soil and stone powder, thus increasing the amount of water-reducing agent and sand. The adaptability of stone materials improves the workability of concrete.
When the mud content is large, the corresponding area will also increase. In order to ensure better workability and constant slump, you can adjust the amount of powder and aggregate to try to ensure When the aggregate mud content is large, the area remains basically unchanged. Moreover, many voids on the mud surface seriously adsorb admixtures, and adsorption of admixtures is a continuous process, resulting in a continuous decrease in the effective components of admixtures acting on the slurry surface and accelerated slump loss.
Calculate the corresponding adjusted changes in powder and aggregate when the mud content is specific. When the sand contains 5% mud, calculate the amount of mud in the sand, and pass the previous Calculate the amount of adsorption of so much mud on the admixture, and then adjust it
The production technology of concrete mud inhibitors
In the experiment of exploring mud inhibitors for commonly used chemical substances, the clean slurry Based on experiments with mortar and its impact on concrete properties, the best among the organic anionic sacrificial agent-type mud inhibitors is sodium p-aminobenzene sulfonate; the best among the organic cationic sacrificial agent-type mud inhibitors is tetramethyl Ammonium chloride; the best anti- mud agent among the organic neutral sacrificial anti- mud agents is polyethylene glycol 2000; the best anti- mud agent among the inorganic salt anti- mud agents is anhydrous sodium metasilicate.
By analyzing the synthesized anti-mud agent, it was found that amide groups are likely to exist in it and have functional groups related to water-reducing agents such as carboxyl groups, hydroxyl groups, and C-C. Relative molecular weight analysis found that the synthesized polycarboxylate water-reducing agent anti-mud agent has a smaller molecular weight than the polycarboxylate water-reducing agent, and the approximate distribution range should be around a molecular weight of 18,000. Moreover, anti-mud agents with smaller molecular weight, more uniform molecular weight distribution and a higher proportion of target molecular weight polymers have better practical application effects.
The mechanism of action of mud inhibitor
It can be considered that it is mainly to reduce grinding resistance and prevent particle aggregation. The mud inhibitor is physically and chemically adsorbed on the surface of the material, reducing the friction and adhesion between particles, neutralizing the electrical load on the surface of the particles, making the fluidity in the mill better, thus improving the working environment in the mill. It is commonly referred to as “powder rheology”. The grinding process is a process in which mechanical stress acts on the material intermittently. During the action, the original cracks of the material being ground are expanded and extended, and new cracks are generated; during the intermittent period, the attraction of unsaturated bonds causes the cracks to heal again. , when the two forces tend to be balanced, the increase rate of grinding fineness becomes smaller or even decreases. According to this theory of “adsorption reduces hardness”, mud inhibitors also have the function of dispersing and depolymerizing to prevent polymerization.
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