The concrete can only be stressed when the steel bar is cracked, why are the beams in our daily life

It does not mean that the concrete can only be erected when the steel bar is cracked, and when the concrete is not cracked, the steel bar is also one of the stressed bodies. Because the combination of cement and steel ensures that the concrete has a greater bearing capacity.

If there are cracks everywhere in life, then you have to have it, because if it cracks, even if there are steel bars, there will be potential safety hazards, which mainly depends on the statement ability of concrete.

When the concrete is cracked, the steel bar can be stressed, and I think there should be such a situation in our lives.

The beam is practical after the concrete is mixed with water, and the water also has a certain volume, and when the water volatilizes enough, it becomes a beam, so the space for water is still there, so the beam should be the concrete after the cracking.

Yes, the force of this steel bar is subject to the main force, that is, all the forces of this part are borne by the cracked steel bar, and the beam body is not cracked, which belongs to the equal load, which is a prestressed beam.

The concrete does not wait for the reinforcement to crack before it is stressed, and the reinforcement should also be thin before he is in the column.

Nonsense, if it cracks, it will be scrapped, especially the stressed structure must not have these problems. It's like your arm, the steel is the bones and nerves, the concrete flesh and blood, if the flesh is rotten, do you think your bones will be fine over time, and the arm will still be normal? I don't know which master said this, misleading!!

The concrete can only be stressed if the steel bar is cracked. But the beams in our daily lives are not cracked. It's because the concrete is up to standard. There is a cohesive force between the concrete.

Why we don't crack the amount in daily life, first of all, it has to do with the number of concrete, and it also has to do with construction.

Because of this situation, I think there should be my life situation, if there is really no rate, what do you think this arm frame is?

Concrete can only be accepted by reinforcing steel, why is the amount in our daily life not cracked, if your amount is cracked, the quality of your building will definitely not be good, it is impossible to crack.

Is it capacity concrete? Stressed concrete who said there is such a situation.

1.Not well maintained. After the concrete is poured, there is no timely sprinkling and water retention measures such as laying straw and cotton wool, resulting in cracks in the drying and shrinkage of the concrete;

2.When the concrete is poured, the vibration is not compact. The concrete collapses during the solidification process to form cracks;

3.There is too little reinforcement configuration. The number of steel bars is too small to resist the load, so that the concrete is damaged by tension, and such cracks generally appear in the ceiling, that is, under the roof;

4.Corrosion of steel bars. The protective layer of the steel bar is thinner, which causes the rust volume of the steel bar to increase, and the concrete roof is cracked;

5.The freeze-thaw cycle of concrete creates cracks. Such fissures are generally found in northern regions.

In general, the cracking of concrete along the position of the steel bar is because the protective layer is too thin after the concrete shrinkage and settlement, resulting in the low strength of the protective layer, and the concrete slump should be controlled as small as possible when pouring.

The reason for the cracking of the steel bar position along the edge of the mouth is that he didn't use a real knife stick, and it is still not true that it really belongs to you.

Causes of cracks in reinforced concrete beam spans from top to bottom:

1. The vibration is not in place when pouring concrete.

2. The stirrup configuration is inconsistent with the drawings and atlases.

3. The stressed steel bar at the bottom cuts corners.

4. Due to the negligence of the construction personnel, the anchorage of the stressed steel bar is wrong.

5. Subjected to serious external force.

Conceptual analysis. Longitudinal reinforcement is a reinforcement that is arranged parallel to the longitudinal axis of the concrete member. The reinforcement configured in the compression zone of the section is called the longitudinal compression reinforcement; The reinforcement that is placed in the tension zone of the section is called the longitudinal tension reinforcement.

When the beam is higher (HW 450mm), in order to prevent concrete shrinkage and temperature deformation and produce vertical cracks, strengthen the stiffness of reinforcement skeleton simultaneously, set up a waist bar with a diameter of not less than 10mm at every 200mm at every 200mm along the beam height on both sides of the beam, connect with the tension bar of 6 or 8 between the two waist ribs, and the tension spacing is generally 2 times that of stirrups.

1. The vibration is not in place when pouring concrete.

2. The stirrup configuration is inconsistent with the drawings and atlases.

3. The stressed steel bar at the bottom cuts corners.

4. Due to the negligence of the construction personnel, the anchorage of the stressed steel bar is wrong.

5. Subjected to serious external force.

Summary. Dear, I am happy to answer for you: the concrete beam is a little slight crack problem, the serious general load-bearing beam is very strong, and the type of steel bar and concrete are very particular, after the general concrete is poured, compaction is carried out to wait for the solidification of the concrete, and finally the removal of the mold This series of processes are very rigorous, and will also take into account weather factors.

Therefore, the concrete itself has a certain elasticity, and this kind of crack will generally not occur. If there are slight small cracks, but the intermittent kind may not have much impact on the load-bearing, because due to the weather, due to humidity, due to the material of the concrete, etc., there will be a little such cracks, as a construction unit will also deal with these cracks, of course, there will be inspectors to test.

Dear, I am happy to answer for you: the concrete beam is a little slight crack problem serious general load-bearing beam is very strong, and the model of steel and concrete are very particular, after the general concrete pouring, compaction and waiting for the solidification of concrete, and finally the removal of the mold This series of processes are very rigorous, and will also take into account weather factors. Therefore, the concrete itself has a certain elasticity, and generally there will be no cracks in this high category.

If there are slight small cracks, but the intermittent kind may not have much impact on the load-bearing, because due to the weather, due to humidity, due to the material of the concrete, etc., there will be a little such cracks, as a construction unit will also deal with these cracks, of course, there will be inspectors to test.

Vertical cracks appear when the strength is reached.

1. The solution to the cracking of the load-bearing beam is to strengthen it in advance. The common reinforcement methods for general house reinforcement include pasting Hummer carbon fiber cloth reinforcement, steel reinforcement, prestressed carbon plate reinforcement and other ridge reinforcement methods. 2. If there are slight vertical cracks in the load-bearing beam, it is generally caused by bending failure.

If there are fewer reinforcements in the joists, the masonry strength is higher, and the wall height span is relatively small, then the vertical cover crack will appear first in the middle span of the wall beam under the vertical load. 3. The vertical cracks extend rapidly upward with the increase of load, and continue to expand upwards after entering the wall, and the vertical cracks in the joist continue to appear. When the reinforcement of the main crack section of the joist reaches the yield limit, the wall beam undergoes bending failure.

1. The local supporting pressure of the beam end is increased due to the sinking of the pier abutment, resulting in cracks at the top of the beam.

2. Due to the insufficient reinforcement in the tension area, cracks disappear all the way up in the middle of the beam.

3. Due to the lack of reinforcement in the direction of the main tensile stress, cracks occur at both ends of the beam at 45° with the beam axis, and the maximum width is matched with the ballast spike on the central axis, without cracking to the top and bottom of the beam.

4. Due to the sectional pouring of concrete during construction, fine joints are produced at the joints.

5. Due to the uneven volume change during the solidification process of concrete, shrinkage joints with uncertain direction occur on the concrete surface.

6. Cracks in the approximate horizontal direction will occur due to the layered pouring of concrete by Peib.

7. Cracks occur due to uneven stress on the shelving point during beam prefabrication or when the moving position does not reach a certain solidification period.

8. Due to the rough setting of the bearing during installation, the fulcrum is inclined and torsional in the perpendicular direction to the bridge axis.

9. Due to the lack of strength when removing the mold, the joint is vibrated accidentally, and small cracks occur at the joint.

10. During the construction of the transport beam, the bearing point is biased to the middle of the span, so the upper part produces cracks.

11. The concrete is not well cured, so cracks occur on the surface.

12. During the transportation of the beam, due to the bumps in the road, the left and right twists will cause the inclined plane cracks of the beam.

13. Cracks occur due to the passage of heavy vehicles that exceed the design load.

Active cracks in the beam and surrounding structures, as well as unstable cracks due to continued expansion, can be repaired with functional mortar. The recommended materials are: RMO joint repair mortar, BUS flexible cement caulking, ECM epoxy repair mortar, EC2000 polymer anti-crack mortar, RC polymer reinforcement mortar, etc.

Cracks with a width less than no longer develop, can not be treated. 2. Cracks that are larger than must be treated, especially the important parts of important beams, and the cracks should be repaired with cement mortar or epoxy resin in time. If the cracks of the beam affect the bearing capacity of the beam, then the steel plate or section steel should be bonded to the surface of the concrete crack part of the component with a modified epoxy resin binder, so that the steel plate (or section steel) and the concrete are connected to work together as a whole.

(1) First of all, we should do a good job in foundation treatment, strictly control the uneven settlement of the foundation, especially the necessary tamping and reinforcement treatment of soft soil, fill soil and collapsible loess foundation, so as to avoid uneven settlement caused by water immersion of the foundation.

2) Set up settlement joints in appropriate positions in strict accordance with the regulations, minimize the uneven settlement difference of the foundation, appropriately set up foundation beams in the seismic area, and reasonably set expansion joints, with a maximum spacing of no more than 50 meters.

3) After the cast-in-situ concrete components of the masonry structure are poured, they are covered with plastic film and straw bales or oilcloth to strengthen the moisturizing and thermal insulation of the concrete.

4) Reasonably organize the construction, and strictly control the process in the process of concrete production in the links of blanking, mixing, pouring, and vibration. To improve the performance of cement, reasonably reduce the amount of cement, reduce the water-cement ratio, strictly control the concrete unit water consumption below 170kg m3, the water-cement ratio below, and select good coarse and fine aggregates and appropriate slump.

Summary. How to deal with cracks in reinforced concrete beams.

Hello, glad to be able to your question, I hope my favorite person is helpful to you. :)

1-Injection method: When the crack width is small and deep, the repair method of injecting the repair material into the concrete can be adopted, firstly, the crack is installed with an injection pipe, and the other parts are sealed with the surface treatment method, the material is injected with low-viscosity epoxy resin, and the repair is injected with an electric pump or a manual pump, and the effect of this method is better when the crack width is larger.

2-Surface repair method: This method is suitable for narrow joints, used to restore the surface beauty of the component and improve durability, commonly used is to lay film materials along the surface of concrete cracks, generally epoxy resin or resin impregnated glass cloth.

3- When the crack is wide, a V-shaped or U-shaped groove can be chiseled along the surface of the cracked concrete, and resin mortar material can be used for filling, or materials such as cement mortar or asphalt can be used. During construction, the debris in the tank is removed first, the bottom binder is coated if necessary, and the filler is fully hardened after filling, and then the surface is polished with a grinding wheel or polishing machine.

Hope it helps.

How to deal with cracks in reinforced concrete beams.

Hello, typing takes time, please wait a little and get back to you as soon as possible.

How to deal with cracks in reinforced concrete beams Hello, I'm glad to be able to your problem, I hope my favorite person will help you. 1-Injection method: When the crack width is small and deep, the repair method of injecting the repair material into the concrete can be adopted, firstly, the crack is installed with an injection pipe, and the other parts are sealed with the surface treatment method, the material is injected with low-viscosity epoxy resin, and the repair is injected with an electric pump or a manual pump, and the effect of this method is better when the crack width is larger.

2-Surface repair method: This method is suitable for narrow joints, used to restore the surface beauty of components and improve durability, commonly used is to lay film materials along the surface of concrete cracks, generally can be used epoxy resin or resin impregnated glass cloth 3-When the crack is wide, can be chiseled into a V-shaped or U-shaped groove along the surface of the cracked concrete, and the resin mortar material is used for filling, and materials such as cement mortar or asphalt can also be used. During construction, the debris in the tank is removed first, the bottom binder is coated if necessary, and the filler is fully hardened after filling, and then the surface is polished with a grinding wheel or polishing machine.

Hope it helps.