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The so-called concrete cold joint refers to a weak surface formed in the concrete structure during the pouring process due to unexpected factors that cause interruption of concrete pouring, and the interval time exceeds the initial setting time of concrete but is less than the final setting time of concrete. When cold joints occur in concrete, they can bring significant hidden dangers to the concrete structure, affecting the gripping force of the concrete, the integrity of the concrete structure, and the protective effect of the concrete. Water may rust the steel bars through the cold joints, affecting the self waterproofing and service life of the structure.
So, how to deal with concrete cold joints is particularly important. You can manually chisel off the milk skin on the surface of the concrete, rinse it clean with water, use stone free mortar joints, and strengthen vibration and curing.
Specific measures include:
1. Surface repair method
This is a common repair method, mainly suitable for the treatment of surface cracks that are stable and have no impact on the structural bearing capacity, as well as deep cracks. The usual treatment measures are to apply cement slurry, epoxy adhesive or anti-corrosion materials such as paint and asphalt to the surface of the crack. While protecting, in order to prevent the concrete from continuing to crack under various effects, measures such as pasting glass fiber cloth on the surface of the crack can usually be adopted.
2. Concrete replacement method
This is an effective method for dealing with severely damaged concrete, which involves first removing the damaged concrete and then replacing it with new concrete or other materials. Common replacement materials include ordinary concrete or cement mortar, polymer or modified polymer concrete or mortar.
3. Structural reinforcement method
When cracks affect the performance of concrete structures, it is necessary to consider using reinforcement methods to treat the concrete structure. The commonly used methods in structural reinforcement include increasing the cross-sectional area of concrete structures, wrapping steel at the corners of components, using prestressing method for reinforcement, pasting steel plates for reinforcement, adding support points for reinforcement, and spraying concrete for reinforcement.
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