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Concrete cracking is a common problem in construction engineering, which not only affects the aesthetics of the building, but also may have an impact on the safety of the structure. Understanding the causes of concrete cracking is important to prevent and solve this problem. This article will analyze the top 10 causes of concrete cracking and provide corresponding preventive measures.1.Unauthorized addition of water during construction and change of water-cement ratio: this is the most important cause of concrete cracking. During the construction process, in order to improve the working performance of concrete or pursue rapid construction, some construction personnel add water without authorization, which changes the water-cement ratio of concrete, resulting in the reduction of concrete strength and weakening of crack resistance.
2.Concrete takes too long in the process of transportation: If the concrete is transported for too long, it may cause too much moisture inside the concrete to volatilize, so that the concrete will crack.
3.Non-standard formwork operation: Non-standard formwork operation, such as loose formwork joints, improper formwork removal time, etc., may lead to concrete cracking.
4.Confusion in the management of the construction process site: The confusion in the management of the construction process site, such as the lack of maintenance of construction equipment and the improper operation of construction personnel, may lead to the quality of concrete being affected, which may lead to cracking.
5.The construction progress is too fast: In order to catch up with the schedule, some construction units may choose to speed up the construction speed, resulting in the cracking of the concrete during the solidification process.
6.No proper vibrating: Vibrating is a critical part of ensuring the quality of concrete. Under-vibration, leakage or over-vibration can lead to defects such as hollowing and bubbles inside the concrete, which can lead to cracking.
7.Segmented pouring joint parts are not treated according to the construction joints: When pouring concrete in sections, if the joint parts are not treated according to the requirements of the construction joints, it may lead to cracking of the concrete at the joint parts.
8.Excessive plastering: During the polishing process of concrete surfaces, if over-plastering, it can lead to fine cracks on the concrete surface.
9.Incorrect curing method: Concrete curing is a key link to ensure the quality of concrete. Incorrect curing methods, such as over-curing and under-curing, can lead to cracking of concrete.
10.Early freezing of concrete: In winter construction or areas with large temperature differences, early freezing of concrete may lead to cracking of concrete.
To sum up, the causes of concrete cracking can be mainly divided into problems of raw materials, problems in the construction process and problems of post-maintenance. To prevent concrete cracking, it is necessary to start from these three aspects and take corresponding measures:
1.In terms of raw materials: choose the appropriate concrete mix ratio to ensure that the water-cement ratio is appropriate and avoid adding water without authorization.
2.In terms of construction process: strengthen on-site management, ensure that construction equipment is maintained in place, standardize construction operations, and avoid construction progress too fast.
3.Later curing: Correct concrete curing, avoid excessive or insufficient curing, and ensure that the concrete is fully hardened during the solidification process.
Through the above measures, concrete cracking can be effectively prevented and the quality of construction projects can be improved. construction site