What are the effects of adding too much water reducing agent?

Normally, practitioners will add a sufficient amount of water-reducing agent to the concrete to increase the slump of concrete, which can effectively improve the quality of freshly mixed concrete. The cohesiveness of the soil. Experience shows that the slump of damage within one hour of concrete without water-reducing admixture is less than that of concrete with water-reducing admixture. This is the main reason for this “weird” phenomenon. After the concrete is mixed with water-reducing agent, it still needs to go through the process of mixing, transportation and concrete pouring. Therefore, at the concrete construction site, it is necessary to release water to repair the slump of the concrete that has been added with water-reducing agent. This is It will also significantly reduce the strength of concrete and other properties, resulting in concrete cracks, hard lumps, etc. Mixing in reasonable amounts can not only effectively avoid the problem of concrete slump damage, but also control product costs at the required level and maintain concrete Pouring profit.

What are the effects of adding too much water-reducing agent?

If too much is added, it will affect the setting and hardening of cement, thereby affecting the strength of concrete

Adding water reducing agent will increase the slump of concrete. If too much is added, it will cause concrete to bleed or even segregate.

Theoretically, adding a small amount of water-reducing agent will only increase the slump, but will not affect the water-cement ratio, and the strength of the concrete will not be affected. Influence. But if not handled properly, it will definitely affect the strength.

The impact on strength can be considered from the following aspects:

1) Test block production . The water-reducing agent increases the slump of the concrete, and the concrete is prone to segregation and bleeding, so the requirements for the production of test blocks are very high. If the test blocks are not produced in a standardized manner, the strength will be reduced.

2) Concrete slump. If the slump of the prepared concrete is below 200mm, adding less admixtures will have little effect; if the slump is relatively large, above 220mm, the impact of the secondary addition of admixtures will be greater.

3) Adjust the concrete. If the slump of the concrete is too small after being transported to the construction site, admixtures need to be added twice for adjustment. Stronger than adding water. However, it should be noted that pouring should be completed quickly, otherwise problems such as pump blockage may occur. </p