During the construction process, what is honeycomb, hemp surface

Honeycomb: The concrete is not compacted due to vibration during the pouring process, resulting in bubbles or voids inside the concrete, similar to honeycomb, so it is called honeycomb in engineering.

Matte surface: The concrete is not vibrated enough during the pouring process, resulting in bubbles or gaps on the concrete surface.

Mainly caused by the vibration is not compact, honeycomb is a small pit in the concrete component, and the hemp surface is a very shallow piece of uneven surface. What else can be done, with the concrete with a high grade of the relative component concrete for repair.

Use mortar to smooth out the uneven concrete surface, you won't.

It's so complicated, I dare say he doesn't understand it.

Honeycomb and hemp surface are uneven surfaces and small cavities caused by improper vibration or poor concrete quality in the concrete pouring process.

The concrete strength is not strong enough to remove the formwork, which will also cause honeycomb and hemp surface.

**Measures to prevent and control common problems of concrete quality.

During the construction of concrete engineering, some common quality problems often occur, these common quality problems can not be prevented and controlled during construction.

In the process of concrete engineering construction, some common quality problems often occur, affecting the safety of the structure, how to eliminate the common quality problems to the greatest extent, to ensure the safety of the engineering structure, is the urgent need of engineering management personnel to master, this article is combined with the actual work, the quality of the concrete engineering common problems and prevention and control.

1. Cellular phenomenon. Concrete structures are partially populated with umbrellas.

1) The honeycomb surface that appears after the concrete is poured and the mold is removed, and the honeycomb depth does not exceed 1cm.

2) In a component, the hemp surface area of each inclined surface shall not exceed 1% of the surface area.

3) When there is a hemp surface on several sides of the component, the percentage of the hemp surface area should be used.

The highest side indicates the degree of honeycomb surface of the component.

The causes of the surface of the concrete, the exposed ribs, the honeycomb, and the holes are:

The main reasons are:

1) The surface of the template is not smooth, and there are sundries such as dry and hard cement slurry blocks.

2) The wood formwork is not fully moistened before the concrete is put into the mold.

3) Steel formwork release agent.

The application is uneven.

4) The joints of the formwork are not strict, and the poured concrete runs out of slurry.

5) The thickness of the cushion block of the reinforcement protective layer is improper, or the placement spacing and position are improper.

6) Concrete slump.

Ease of use is not good.

7) Improper vibration when pouring concrete.

8) The concrete pouring height exceeds the specified requirements, and no measures are taken, resulting in concrete segregation.

9) Concrete demoulding is too early.

The honeycomb surface area of concrete is greater than how much, and the honeycomb and hemp surface area shall not exceed the surface area, and the non-stressed cracks on the concrete surface shall not exceed the construction quality requirements of the pipe culvert. (2) Ensure that the concrete surface is smooth, the ridge line is straight, and there is no serious edge gnawing and corner loss. (3) If the area of honeycomb and hemp surface shall not exceed the surface area, the non-stressed cracks on the concrete surface shall not be exceeded.

4) The caulking of the plate should be flat and compact. (5) During the construction process, it is strictly forbidden to use chutes to transport concrete. For low-lying construction sections in mountainous areas, if necessary, pump trucks are used to transport concrete, and long chutes are not allowed.

What are the causes of honeycomb and how to avoid it.

Dear, hello, I am happy to serve you, about your question "what is the cause of the honeycomb and how to avoid it", has been queried for you, the answer is as follows: kiss, concrete vibration is not in place. That is to say, when we pour concrete, the plug-in vibrating rod is not vibrated in place, resulting in the vibration of the part is not compacted, and the honeycomb surface is formed after the concrete is solidified.

The template used does not meet the requirements. The surface smoothness of the formwork is not enough, and finally a honeycomb surface will be formed on the upper surface of the concrete. The reinforcement of the template is not firm, and the local area of the guide potato is leaking.

After the leakage, it will lead to more stones in this part, and less cement slurry, and the result is that there is a honeycomb surface, and we must first remove the loose stones at the honeycomb surface. It can be gently removed with a chisel until it is chiseled to the dense concrete inside. The use of high-grade cement mortar is directly applied.

If the honeycomb surface is severe, fine stone concrete can be used for re-pouring. Maintenance. Whether it is applying cement mortar or pouring concrete, the stool hand Zheng must maintain it in time.

(1) The surface of the template is not smooth and clean; The wood formwork is not wet enough before pouring concrete; The gap of the template is too large, resulting in slurry leakage of the template.

2) The concrete is not accurately fed according to the mix ratio (less slurry and more stone); The concrete mixing time is short, the mixing is uneven, and there are many stones and less slurry in some parts when pouring.

3) Concrete is poured without layering; The free dumping height of the blanking is too large, resulting in aggregate separation.

4) After the concrete is put into the mold, the vibration quality is poor, resulting in leakage vibration or over-vibration.

5) The concrete is not well cured after pouring.

Precautionary measures: 1) Before pouring concrete, carefully check the gaps of the formwork, and repair them in time when the gaps are found to be large to ensure that the gaps of the formwork are tight; The wooden formwork should be fully watered and moistened; The steel formwork should be cleaned of dirt such as surface mortar and brushed with release agent.

2) The concrete should be accurately fed in strict accordance with the mix ratio (that is, the measurement of cement, sand and gravel, water, admixtures, etc. in each plate of mixture should be accurate), and the water-cement ratio, collapse and mixing time should be strictly controlled.

3) The concrete should be poured in layers; When the free falling height of concrete exceeds 2m, it is necessary to increase the chute and chute to prevent aggregate separation.

4) When the concrete is inserted into the vibrator, the vibration time of each point is controlled at 20 30s; The vibrator should be inserted and pulled out quickly, and after the slurry appears, the concrete can stop vibrating without sinking.

5) After the concrete is poured for 12 hours, it can be cured by covering straw bags and sprinkling water to ensure that the concrete is always kept wet, and the curing time is 14 28d.

Treatment method: 1) Honeycomb: chisel the loose stones, rinse them with a punching machine, and then fill them with fine stone concrete one level higher than the original mark, so that its strength meets the design requirements.

2) Textured surface: Rinse the concrete surface with a wire brush or punching machine, and wipe and calender with 1:1 or 1:2 cement mortar. After repairing, it should be watered and maintained in a timely manner.

1. The water-cement ratio of concrete is too large, and the concrete is segregated.

2. The shock is not in place, and the shock is leaking.

3. Concrete has poor workability, too dry or too much aggregate.

4. The unloading height of concrete exceeds 2m, and each channel or chute is set, and the stones are piled up during the unloading process 5, and the joints of the formwork are not dense and the slurry is leaking.

6. The template is not cleaned and the release agent is not brushed.

The workability of concrete is poor, and the segregation and water leakage are generated, resulting in the honeycomb surface of concrete. Repair method: Brush the hemp surface with clean water, fully moisten it and smooth it with cement slurry or cement mortar; The loose stones on the honeycomb are cut into a bell mouth, and then cleaned with clean water and repaired with cement mortar.

Question: Does it have any effect on the concrete on top of the soil and sand?

Question: Does it have any effect on the concrete on top of the soil and sand?