What are the causes and measures for concrete segregation? Where can Hebei anti-segregation agent manufacturers buy concrete coating agents in Beijing?

Causes of concrete segregation: poor cement quality, segregation caused by aggregates, reasons for admixtures, reasons for equipment failure, etc.

Remedial methods for concrete segregation:

1. For problems caused by aggregate moisture content Concrete segregation can be solved by extending the mixing time to increase the amount of admixtures such as fly ash, which is also effective in controlling this type of problem.

2. Quality must be strictly controlled during the construction process, and unqualified materials must be prevented from entering the construction site to ensure the stability of aggregate quality.

3. If the water content in the sand is in a saturated state, the mixing time can be extended to solve or increase the amount of fly ash and other admixtures.

4. Increasing the sand rate to adjust the concrete mix ratio can also solve segregation. The main cause of concrete segregation problem is that the concrete has been stopped for too long without stirring, or the water-cement ratio is too high. Treatment method Generally speaking, the first phenomenon requires timely stirring and slump test. Normal construction can only begin after the slump test is suitable. If the water-cement ratio is too large, it is necessary to adjust the water consumption in time. It is best to have a tool or meter to measure the water volume.

What are the causes and measures of concrete segregation

What are the precautions for concrete pouring

1. When pouring concrete formwork, it is not allowed to concentrate the pouring and impact the formwork or steel frame. When the pouring height is greater than 2 meters, use string tubes and chute tubes to unload materials, but the output The height from the material opening to the pouring layer cannot exceed 1.5 meters.

2. Concrete must be poured within 5 hours to prevent cold joints from appearing when the concrete is poured. Cold joints occur when the interval between upper and lower concrete pouring exceeds the initial setting time. For the construction quality joints formed, the time for two concrete pours cannot exceed 1.5 hours.

3. During the pouring process, the vibration time should be such that slurry appears on the surface of the concrete without bubbles or sinking. The moving position distance should not exceed 40CM to ensure no leakage and no vibration.

4. When pouring concrete for beams and slabs, you should start from the joints of beams and columns to ensure that the positions of beams and columns are compacted, and use the rapid grouting method to circulate forward and with the slab. Pour at the same time, but no cold joints should appear.

5. When it is almost completed, it is necessary to estimate the remaining concrete square volume and the remaining concrete volume, and contact the mixing station for debugging.

6. After the concrete is poured, use a scraper to scrape the surface, and then use a brush to roughen the surface. Use cement and concrete interface treatment agent to form cement mortar, and then the above Cement mortar is applied to the wall by brushing. Spiny protrusions form directly on the surface and become rough after drying. Function to strengthen bonding ability.

7. After pressing the concrete surface two or three times, cover it in time. When the concrete is finally set, spray water to completely wet it, then cover it with plastic film, and check the surface of the plastic film. Once it is dry and out of water, spray water again for maintenance.

8. Construction must be carried out strictly in accordance with the concrete mix ratio. In particular, the slump must be controlled, which has a great influence on the lateral pressure of newly poured concrete. Therefore, during construction, the production and transportation capacity of concrete on site should be fully considered, and the pouring speed and time should be correctly set.

9. In practice, in order to reduce the number of installation and removal of pump pipes, many construction teams move the pump pipes after the walls are filled with concrete, which will lead to The position was poured too quickly, causing the formwork to expand.