As we all know: the use of water reducing agents is very helpful to our use of concrete, and can improve durability, strength and other properties. But if used improperly, some other problems will occur. Many people don't know what's going on.
1. Add water-reducing agent. If the trial is improper, the common phenomena of pot sticking and false coagulation will occur. It means that the cement mortar partially sticks to the wall of the mixer barrel, causing the concrete coming out of the machine to be uneven and sticky, or the concrete mixture to come out of the machine will quickly lose its fluidity, and it may even become impossible to pour and construct.
2. In the early stage, sometimes the non-setting phenomenon will occur, that is, after adding the water-reducing agent, the concrete has not solidified for a long time, even all day and night; and in the later use of concrete, if the water-reducing agent Improper use will result in low strength, that is, the strength is much lower than the test results of the same period, or the concrete has set, but its strength is extremely low.
3. Another serious problem is the phenomenon of excessive slump loss. Concrete quickly loses workability. The slump decreases by 1-50mm every 2-3 minutes after leaving the tank, and there is obvious settlement. bottom phenomenon.
Although the dosage of various water-reducing agents in concrete is very small, they have a great impact on concrete. In addition to strictly controlling the entry quality when using them, their dosage must also be strictly controlled. Excessive addition of any kind of admixture will have a great impact on concrete. A considerable number of commercial mixing stations have experienced quality accidents caused by overmixing of admixtures.
Commercial mixing stations should pay attention to cultivating a high sense of responsibility and responsibility among mixer operators and experimenters; conduct regular inspection and maintenance of the admixture weighing system; once the retarder is found to be over-mixed, it should be Deal with it promptly and decisively, and scrap the unqualified concrete.
About the problems that are likely to occur in concrete after adding water-reducing agents, I will share here. Learn more about the precautions for using water-reducing agents, and read more about the detailed explanation of the dosage of water-reducing agents. According to the actual operation conditions, mix the concrete achieve better results.
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