1. uneven settlement of buildings
When the uneven settlement of the building occurs, the hardness and stiffness of the whole building will become worse, resulting in irregular deformation in vertical and horizontal directions. At the same time, the whole foundation can not bear its variable force, which makes some parts of brick masonry produce shear force. When the deformation capacity is not enough to resist, cracks will appear.
Cracks caused by uneven settlement of houses are generally horizontal or vertical cracks. This kind of crack is a light crack in the wall, and a serious crack will lead to the collapse of the house, usually on the first floor, but also on other floors under special circumstances.
2. The temperature difference of architectural memory.
Cracks caused by this factor mostly occur in brick-concrete multi-storey houses. For example, the roof of a building is a reinforced concrete slab and the wall is a brick wall, so it is easy to cause cracks due to temperature difference, not only because the linear expansion coefficients of the roof and the wall are twice different, but also because the solar radiation area received by the roof is much larger than that of the wall.
Summer and winter are easily affected by temperature, which leads to wall cracking. In the early days, temperature was the dominant factor in the formation of cracks, and it took some time for the cracks to stabilize and would not continue to develop. This kind of crack is generally manifested as horizontal seam, straight splayed seam and inverted splayed seam.
3. Other reasons in the process of decoration
Some problems in decoration will also lead to wall cracking.
For example, when plastering cement ash, improper cement slurry ratio will lead to wall cracking; Uneven scraping of wall putty; Incorrect decoration operations such as improper proportion of water and latex paint will lead to cracks. This kind of crack is generally irregular and linear, which has little overall impact, does not affect the safety of living, and only affects the beauty of home decoration.
4. Super-long concrete structure
With the improvement of concrete strength grade, the development of large-scale buildings and the application of mercury conveying concrete technology in construction, the number of floors is increasing, which makes the temperature difference in super-long concrete structures increase and causes shrinkage cracks.
This kind of crack is generally horizontal, straight and inverted. However, such cracks will not have any impact at present.
It will not affect the safety and bearing capacity of the whole structure, but it will endanger the durability and integrity of the whole structure and bring a very bad life experience to users. My conclusion: From the above, I am interested in cracks.