Problems Should Be Paid Attention to in the Use of Concrete Expansion Agent

The main function of the concrete expansion agent is to compensate the shrinkage and shrinkage in the hardening of the concrete. In order to reduce shrinkage and cracking, the expansion agent can be applied to various crack-resistant waterproof concretes, especially for underground, hydraulic, offshore, subways, tunnels, etc. Water-requiring steel-concrete structure engineering.

[1]. Volume problems

Many construction companies do not use expansion agents for "excellence," but in order to get the project money for the budget of the construction unit (ie, Party A), they will ask the mixing station to provide information on the use of existing expansion agents and stir. If the station is overwhelmed, it will meet the requirements of the construction unit. As a result, the concrete that is actually used in the structural part of the project does not really have the expansion effect that it has, causing the project quality problems.

[2]. Maintenance issues

The concrete mixed with swelling agent should be fully maintained, and the general heat preservation and moisturizing should be no less than 14 days and nights. Only in this way can the swelling effect be exerted and a good effect can be obtained.

[3]. Mixing time problem

The concrete mixed with swelling agent should be prolonged for a certain period of time, and the stirring time should be prolonged by about 30 seconds than that without the expanding agent to ensure even mixing and improve homogeneity, so that the expansion effect can be embodied evenly.

[4]. Demoulding problem

In construction, often in order to speed up the construction progress or speed up the template turnover rate, often the demoulding is too early. At this time, the expansion effect is still not obvious, causing the concrete to dissipate heat faster and cause structural concrete cracks. Therefore, the general wall should not be demolished earlier than 5 days.

Therefore, in addition to the above problems, it should also pay attention to the construction of thermal insulation and moisture in winter, as much as possible to reduce the amount of cement and reduce the heat of hydration. Only by doing so can we ensure that the quality of the concrete blended with expansive agent can be reduced and the cracks in the structure can be reduced or avoided.

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