The repair of cracks in self-built houses with brick and concrete structures is a problem that many owners will encounter. As the age of the house increases, it is common for cracks to appear in the walls. So, how to effectively repair the cracks of brick-concrete structures?Bajie Meizhai will introduce you to several commonly used crack repair methods for brick-concrete structures.
1. Cracks caused by uneven settlement of the foundation
1.For the general fine cracks (1-2mm) that are not large in settlement difference and have ceased to develop, because it will not affect the safety and use of the structure, mortar plugging can be used.
2.For the uneven settlement is still developing, the cracks are serious and continue to develop, should be carried out in line with the principle of reinforcing the foundation first and then treating the cracks.
2. Cracks caused by temperature differences
1.Temperature difference cracks generally do not endanger the safety of the structure and will tend to stabilize in 2-3 years, so such cracks can be treated after they are basically stable.
2.For cracks caused by the deformation of the material itself, it is also necessary to wait for the cracks to stabilize before replastering and spraying.
3. Cracks caused by the quality of construction
1.Cracks caused by construction quality can be simply repaired according to the cause of the cracks (can be filled with micro-expansion mortar), partially repaired or demolished, and re-masonry can be carried out according to the correct construction process.
In conclusion, wall cracks are one of the common building quality problems. Prevention should be taken before it happens, prevention should be the mainstay, and the practice of blocking should be adopted if it cannot be prevented.
Why do brick-concrete structures have cracks?
We know how to govern, but only by understanding its causes can we better avoid and raise our awareness of prevention.
1.Let's think about why a piece of paper cracksIt must be because we tear it hard, and when the force exceeds the capacity of the paper, cracks occur.
The principle of tearing paper is the same as that of brick-concrete structure. Even though the house is built of brick and mortar, it also has a certain strength. The bricks are bonded together by cement mortar to form a whole to bear the weight.
2.If we push the brick wall horizontally and use enough force, the wall will collapse. This is because the maximum shear strength of the brick wall and the tie force between the bricks are exceeded.
Similarly, the cracks are due to the force, but not to the extent that the wall collapses. If the cracks continue to expand, the wall may collapse. This force is not downward pressure but a horizontal thrust. The most common is the force, which is why many brick-concrete houses have wall cracks.
3.In normal use and living, even if it does not happen, why do cracks still appear in the house?
1) Uneven settlement of the foundation. Cracks caused by uneven settlement of the foundation can occur when the house is not geologically explored and designed at the time of construction, or when the house is too long and has different floors resulting in uneven weight distribution and has not undergone foundation treatment.
2) Cracks caused by temperature differences. Due to the principle of thermal expansion and cold contraction, when two different materials are combined together, due to their different deformations, gaps and cracks appear between them when the temperature changes.
The above is how to repair cracks in brick-concrete structures and why brick-concrete will produce cracks to share, welcome to exchange and discuss.