Water Reducing Agent uses in Concrete

The addition of water reducer to concrete can effectively improve the moldability and rheology of concrete. Because the concrete is made of cement and water, after the two are mixed, the electric charge of the cement particles will make the concrete form a flocculation structure, so that the concrete cannot flow freely, and the components in the water reducer can be adsorbed on the surface of the concrete, making The flocculation structure disappears, so the fluidity and plasticity of concrete will be greatly improved.

The effect of the water-reducing agent on cement performance has multiple effects, and it should be fully considered when evaluating the effect of the water-reducing agent on concrete performance. According to different purposes, choose different water reducers, and have a choice of various influencing factors. The compatibility of the water-reducing agent and cement is also one of the indicators for evaluating the performance of the water-reducing agent. If there is incompatibility, the improvement of concrete performance will not be obvious, and even the concrete components will be more prone to cracks.

Quality problems that should be paid attention to when using water reducing agent1. Poor liquidityThe fluidity of the concrete mixture does not meet the expected requirements, and the slump is not enough and sticky. The reason may be that the amount of admixture is not enough, and the amount can be increased appropriately. But do not increase the amount of wood calcium water reducing agent at will to avoid affecting the strength or setting time. In fact, the water-reducing rate and the dosage of wood calcium water reducer no longer maintain a linear relationship after the appropriate dosage is exceeded.

1. No condensation for a long timeCheck whether the amount of water reducing agent is too large. If the amount of water-reducing agent is too large, wet curing can be strengthened. Do not rush to remove the mold. Generally, if it sets and hardens within 3 days, the later strength can still rise. If it still does not condense after 3 days, the later strength is difficult to guarantee. At this time, the strength must be checked with a rebound hammer to ensure the quality of the project.
2. Insufficient strengthInsufficient strength can be manifested as insufficient early strength, but late strength meets the design requirements. This is mainly caused by the retardation effect. At this time, it is necessary to slow down the mold removal time and strengthen the early curing; the other case is that the late strength is insufficient, which is mainly due to the certain air-entraining effect in the water reducing agent. If it is too large, it will inevitably lead to insufficient strength. You can check whether the mixing amount is too large. If the mixing amount is within the allowable range, the water reducing agent may be too air-entraining and the quality is unqualified. At this time, some reinforcement measures must be taken for the concrete.
3. False coagulation (quick coagulation)The phenomenon of false setting is that when the concrete is mixed with ordinary water reducing agent, the concrete starts to lose its fluidity and become hard after more than ten minutes of mixing, but the strength cannot rise after the normal setting time is exceeded. This phenomenon tends to occur when switching to cement varieties.

Kingsun is a professional concrete admixtures manufacturer and supplier.