Concrete cast in place slab surface leakage treatment scheme. 60

The repair mortar construction process can be used.

Base surface treatment: Treat the surface of the concrete foundation, remove the milk skin, cement slurry surface or loose particles on the base surface to expose the solid base layer, and remove the surface sand, dust, grease, etc.

Material preparation: 1. Open the lid of the Z31 epoxy repair mortar packaging barrel, check that the contents of material A, material B and material C are not damaged, leaking, and agglomerating by moisture, and the assembly ratio in each barrel is material A: material B: material C = 1:3:16.

2. When mixing the ingredients, first pour material A and material B into the barrel according to the ratio of 1:3 and stir and mix evenly, and then slowly add material C while stirring until it is stirred into a uniform cement shape.

Construction instructions: 1. According to the construction requirements of the project, the prepared cement is smeared on the repaired part with a spatula, and it should be compacted and wiped when smearing, and it can be put into use after 3 14 days of completion.

2. The reference dosage is about 1700kg m.

Chisel off the loose concrete slag and gravel at the edge, expose the normal concrete, and then pour a layer of high-grade cement slurry, and then pour the higher level of concrete, vibrate and compact the surface after curing. There is a direct pouring of an epoxy mortar, which is imported, the American five-star brand, you can reach the design strength of your concrete in one day, and the construction can be pervasive at higher temperatures, extremely dense, I have repaired the dog hole caused by the leakage of the large T beam, the effect is excellent, but it is more expensive. If the protective layer of steel reinforcement is not enough, the concrete surface can be coated with lithium-based impermeable liquid or epoxy resin.

Your question is a bit general, and the specific situation needs to be analyzed on a case-by-case basis, what is the type of project you are talking about?

Do you want a construction plan or ** If you want a construction plan, I can only say that you can only determine the best construction plan after meeting the site

The exposed rib is the phenomenon that the vibration is not in place in the process of pouring reinforced concrete, the protective layer cushion block is not set or the fixation is not firm, the concrete slump is small, or the formwork is removed early, and the steel bar is exposed after the component is formed due to spalling caused by external force before the concrete hardening.

Causes.

1) When pouring concrete, the displacement of the cushion block of the reinforcement protective layer or the cushion block is too little or leakage, so that the reinforcement is exposed close to the formwork;

2) The cross-section of the structural component is small, the steel bar is too dense, and the stone is stuck on the steel bar, so that the cement mortar can not fill the steel bar around, resulting in exposed ribs;

3) Improper concrete mix ratio, resulting in segregation, lack of slurry at the formwork site or leakage of formwork.

4) The concrete protective layer is too small or the concrete vibrating at the protective layer is not solid; Or the vibrating rod hits the steel bar or tramples on the steel bar, so that the steel bar is displaced, resulting in exposed tendons;

5) The wood formwork is not watered and wet, absorbs water and bonds or demoulds too early, and the edges and corners are missing when the mold is removed, resulting in exposed ribs.

Prevention and control measures

1) pouring concrete, should ensure that the position of the steel bar and the thickness of the protective layer is correct, and strengthen the inspection, when the steel bar is dense, the appropriate particle size of the stone should be selected to ensure that the concrete mix ratio is accurate and good workability; If the pouring height exceeds 2m, the string drum or chute should be used for blanking to prevent segregation; The formwork should be fully moistened and the gaps should be carefully plugged; It is strictly forbidden to hit the steel bar when vibrating concrete, and avoid stepping on the steel bar during operation, and adjust the integrity in time if there is a bend or trip; The concrete of the protective layer should be vibrated and compacted; Correctly grasp the demoulding time to prevent premature demoulding and damage to edges and corners.

2) Surface leakage, after brushing, wipe 1:2 or 1: cement mortar on the surface, and smooth the part of the leakage rib; The weak concrete and protruding particles are chiseled with deep leakage bars, and after being washed and cleaned, they are filled and compacted with fine stone concrete that is one level higher than the original.

Let's see what kind of leakage is it, stirrups or main reinforcements? Is it a honeycomb surface or a hole? Is it missing edges or something. I'll just talk about it briefly.

The hemp surface mainly affects the appearance of concrete, and the parts with a large area are repaired. Brush the hemp surface with clean water, moisten it well and then smooth it with damp cement. (It's useless to basically don't do it.) ）

Concrete has a small honeycomb, can be rinsed with water first, and then repaired with 1 2 or 1 cement mortar, if it is a large honeycomb, then first remove the loose gravel and protruding particles, try to form a bell mouth, the outer mouth is larger, and then rinse with clean water and moisten, and then use a higher level of fine stone concrete to tamp (or foolish, useless, waste of labor, it is better to shake it well, all are mixed, the degree of collapse is very large...)

The problem of holes is basically that everyone should sit down and study it together, formulate a reinforcement plan, and deal with it only after approval. (As long as it's not large, there's nothing wrong with that.) ）

Exposed tendon treatment. First analyze the reasons: the reinforcement cushion block is displaced or the cushion block is too little missing, and the reinforcement is close to the formwork. The section of the reinforced concrete structure is small, the steel bar is too dense, and the concrete cement slurry can not reach the surrounding of the steel bar.

The concrete produces segregation, and the template leaks seriously. The vibrating rod strikes the steel bar and displaces the steel bar; Die removal too early, the concrete is missing edges and corners when removing the mold.

How to prevent: Before pouring concrete, check whether the position of the steel bar and the thickness of the protective layer are accurate, and pay attention to fixing the cushion block. When the steel bar is dense, the maximum particle size of the gravel shall not exceed 1 4 of the minimum size of the structural cross-section, and shall not be greater than 3 4 of the net distance of the steel bar.

When the cross-section of the structure is small and the steel bar is dense, it can be poured with fine stone concrete. Do not step on the steel bar during operation, if the steel bar has bent or tripped, straighten it in time, and tie it well.

Treatment method: clean up the concrete residue and rust on the exposed steel bar, rinse and moisten with water, and then use 1 2 or 1 cement mortar to wipe and flatten, if the exposed reinforcement is deep, the weak concrete will be removed, washed clean and wet, tamped with a higher level of fine stone concrete, and carefully maintained.

When the missing edges and corners are small, rinse with water to brush the place with a wire brush and fully moisten, and then wipe it with 1 2 or 1 cement mortar. The unreal concrete and prominent aggregate particles can be chiseled out, washed clean and moistened with water, and then repaired with fine stone concrete that is one level higher than the original concrete, and carefully maintained.

In fact, this kind of thing is just fooling people, and it doesn't have much effect if you don't deal with it. In general, the small ones don't care, the large ones will remove the weak concrete and reinforce them with a higher level of fine stone concrete, and reinforce them in the large design scheme, and ask experts to deal with the reinforcement in the large ones.

After the concrete is completed, check the pouring quality in time, and find that there are exposed ribs, honeycomb, and hemp surface to take measures in time, and use dry ash to block tightly, and the dry and wet degree of dry ash can be held and formed, and it will be scattered on the ground.

Solution:

1) After brushing the surface of the exposed ribs, use 1:2 or cement mortar to smooth the exposed ribs, and carefully maintain.

2) If the exposed ribs are deep, the weak concrete and protruding particles should be chiseled away (the examination is large), and after washing, it should be filled and compacted with fine stone concrete with a higher strength grade than the original, and carefully maintained.

Analysis reasons: 1) When pouring concrete, the cushion block of the reinforcement protective layer is displaced, or the cushion block is too little exposed, resulting in the steel bar falling or moving outward to be exposed close to the formwork surface.

2) The cross-section of the structural component is small, the steel bar is too dense, and the stone is stuck on the steel bar, so that the cement mortar can not fill the steel bar around, resulting in exposed ribs;

3) The concrete mix ratio is improper, resulting in segregation, lack of slurry or serious slurry exposure of the formwork.

4) The concrete protective layer is too small or the concrete leaks vibration at the protective layer, or the vibrating rod hits the steel bar or tramples on the steel bar, so that the steel bar is displaced, resulting in exposed ribs.