The vibrator should be straight up and down, fast insertion and slow extraction without missing vibration.
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In the actual construction process, if the concrete layer thickness is too large, the effective vibration depth of the vibrator will not meet the construction requirements.
Through these methods, not only the appearance quality of concrete can be guaranteed, but also the concrete bubbles can be effectively controlled! Disclaimer: the content of this article comes from the Internet.
Select aggregates strictly, control the particle size and content of needle and flake particles of aggregates, carefully screen when preparing materials, and discard unqualified aggregates.
Improper use of release agent refers to a substance applied on the construction formwork before concrete pouring, so that the formwork will not stick to the concrete surface after pouring and will not be easy to remove, affecting the smoothness of the concrete surface.
It should be pumped up and down during vibration.
The equipment form and time of concrete mixing and transportation are uneven and the concrete vibration time is not enough.
The duration of each vibration point should be based on the surface showing laitance, so as to discharge the bubbles.
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In addition, some workers only rely on experience or feeling to determine the concrete pouring height, which makes it difficult for bubbles in the concrete to be discharged.
Because it is composed of solid phase, liquid phase and gas phase, some bubbles will be generated after concrete pouring.
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However, if there are too many admixtures, the viscosity of concrete will increase, making it difficult to discharge bubbles.
Under vibration, missing vibration and over vibration of concrete shall be strictly prevented.
In the process of concrete vibration, air is easy to mix in, leading to the bubbles in the concrete mixture can not overflow, and the weight of the concrete can not make these bubbles discharged.
During construction, the release agent shall be painted evenly, but not too much, so as to avoid accumulation and flow.
However, the existence of these bubbles will not only affect the appearance of the project, but also have some hidden risks.
In addition, we should also pay attention not to blindly pursue the workability of concrete and ensure that the admixture is not excessive.
Determine reasonable grading to make the ratio of coarse aggregate and fine aggregate moderate.
The maximum paving thickness of pumped concrete should not be greater than 600mm, and the maximum paving thickness of other concrete should not be greater than 400mm.
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The aggregate grading is unreasonable, there are too many coarse aggregates and too few fine aggregates, or the particle size is not good and the sand rate is small, resulting in that the fine aggregate can not fill the pores of the coarse aggregate and form bubbles.
Select admixtures and cement with uniform and stable distribution and excellent chemical composition.
The concrete shall be poured in layers, and the layer thickness shall be determined according to the mixing and transportation capacity, pouring speed, vibrating capacity, structural characteristics and other conditions.
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If there is any infringement, please contact Xiaobian as soon as possible.
In the actual construction process, bubbles will rise along the formwork due to uneven application of the release agent of the formwork or improper use of the release agent.
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Meanwhile, vibrate according to the method of “quick insertion, slow extraction and up and down extraction”.
Its main function is to isolate the formwork and concrete by forming a film on the surface.
2、 Control measures for concrete bubbles 1.
However, as long as the relevant personnel pay enough attention and adopt effective technical means, it is no problem to fight against these concrete bubbles! 1、 Reasons for producing concrete bubbles 1.
Select appropriate vibration equipment and determine the appropriate vibration time, vibration radius and frequency.
In addition, some inappropriate operation methods are adopted, which will make the concrete produce bubbles.
The concrete pouring is too thick.
For more exciting content, please pay attention to our concrete, which is a general term for engineering composite materials that aggregate is cemented into a whole by cementitious materials, and is widely used in civil engineering.
In actual production, the compatibility test between cement and admixtures should also be conducted, and then select materials with good matching for production.
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Admixtures, cement and admixture cement decrease, and water consumption and free water increase.
Strengthen the cleaning of formwork, select release agent and strictly control its quality, and do not use oily release agent.
