How to prevent corrosion of prestressed steel strand
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- Time of issue:2021-11-12 09:39
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(Summary description)Introduction of steel strands for foundation pits The pre-stressed steel wires and pre-stressed steel strands, technically required copper coating, phosphating
How to prevent corrosion of prestressed steel strand
(Summary description)Introduction of steel strands for foundation pits The pre-stressed steel wires and pre-stressed steel strands, technically required copper coating, phosphating
- Categories:Company News
- Author:
- Origin:
- Time of issue:2021-11-12 09:39
- Views:
Introduction of steel strands for foundation pits The pre-stressed steel wires and pre-stressed steel strands, technically required copper coating, phosphating treatment, and the blackening technology used by Japanese factories, are studied and discussed. Nowadays, foreign countries have also proposed that copper in the exercise ingredients can prevent scientific research dreams. In the steel, tensile stress and corrosive media work together. That is, the tensile stress causes the grains of the steel strand to slip. When there is corrosive medium, the material between the grains is damaged, which causes the steel to develop intergranular cracks and expand into cracks along the grain boundaries. When stress corrosion cracking occurs, it cracks suddenly without obvious warning, and the damage is greater.
Steel strands for foundation pits pointed out that because of the low strain characteristics of pre-stressed high-strength steel, it is more active against stress corrosion. Nowadays, stress corrosion has become a primary policy for measuring the performance of prestressed steel, and it has been paid attention to by various countries. Prestressed steel wire surface coated with zinc is a useful method to delay steel wire corrosion and stress corrosion. When the steel strand has deep defects (such as cracks, cuts, blockages, etc.) or some corrosion pits (especially sharp and deep pits), the galvanized steel wire will experience hydrogen embrittlement cracking. Because the prestressed steel wire has high strength and low plasticity, it is more susceptible to corrosion than general steel.
If it is affected by rain, moisture or corrosive media during storage and transportation, the prestressed steel will undergo electrochemical corrosion, which will cause the steel wire to form corrosion pits of different sizes and dispersions. The corrosion pit is equivalent to a " gap". In the process of tension, the stress steel strands are unevenly distributed, and the stresses at the edges of the "notch" are formed. When the uniform stress is low, the stress at the edge of the "notch" has reached the fracture stress, causing early cracking. The "notch" activation effect formed by corrosion is related to the arrangement of the steel. When there is a higher carbon content and a higher residual stress, the "notch" will be more active to the stress. Because the prestressed steel wire has a small cross-section, high stress and low deformation, it is necessary to guard against corrosion. Steel wires with severe rust spots or corrosion should not be used.
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