Analysis of the causes of freeze-thaw damage to concrete  The alpine region cooling tower concrete structure in use in the process of cracking, spalling, defects and other quality defects are more common, the common reasons include the following two aspects  1.Wet and dry alternation and freeze-thaw cycle damage  Freezing and thawing concrete damage is one of the more common diseases of concrete engineering in alpine regions, which is the damage caused by the physical action of concrete (dry and wet changes, temperature changes, freezing and thawing changes, etc.). The main cause of concrete freeze-thaw spalling is water in the concrete void, in the alternating wet and dry, freeze-thaw cycle, the formation of ice pressure and penetration pressure of the combined effect of fatigue stress, so that concrete from the surface to the inside of the spalling damage, thereby reducing the strength of concrete.  When after repeated cycles of freezing and thawing, the damage gradually accumulated and expanded, developed into interconnected cracks, so that the strength of concrete gradually reduced, and later even completely lost. From the actual is not difficult to see, in dry conditions in the concrete obviously does not exist the problem of freeze-thaw damage, so the state of full water is one of the necessary conditions for freeze-thaw damage to concrete, another necessary condition is the positive and negative changes in outside air temperature, so that repeated freeze-thaw cycle of water in the concrete pores, these two necessary conditions, to determine the freeze-thaw damage to concrete is the beginning of the concrete surface layer by layer corrosion damage.  2.Chemical erosion and carbonation  Chemical erosion is mainly through the chimney gas containing so2, further oxidized to so3 in the air, the formation of chemical erosion of concrete, and with the reaction of ca (oh) 2 in concrete, the production of ca (so) 4, resulting in volume expansion. And ca(so)4 and concrete c3a reaction to generate calcium sulfur aluminate, resulting in *** times volume expansion, expansion stress so that the concrete swelling and cracking, crisp.  Carbonation is mainly the gas emission from the chimney to increase the co2 concentration in the surrounding air, long-term in the high concentration of co2 erosion, resulting in the tower, herringbone column of the concrete to produce carbonation, in the presence of moisture conditions, carbonation of the concrete due to shrinkage and lead to cracking.  Due to the carbonization of concrete and chemical erosion, the original passivation film on the surface of the reinforcement is destroyed, the reinforcement is corroded, and the volume expands, and the expansion stress cracks the protective layer of concrete, forming cracks along the reinforcement, i.e., along the tendon cracks, and then the collapse of the protective layer.  Application  1. High-strength repair material has high strength, high adhesion and good durability, suitable for reinforcement and repair of various types of severely damaged reinforced concrete structures, improving the durability of concrete, extending the service life of concrete, and preventing the erosion of concrete by water-carrying acids, alkalis, salts, co2 and other media.  2. Repair of defects, spalling, exposed ribs, honeycomb pockmarks, thickening of protective coatings, levelling.  3. Repair and consolidation of carbonated concrete.  4. Used for bridges, road surfaces, railway tunnels, hydraulic structures, underground garages, factory floors and other concrete repair.

Analysis of the causes of freeze-thaw damage to concrete

The alpine region cooling tower concrete floor structure in use in the process of cracking, spalling, defects and other quality defects are more common, the common reasons include the following two aspects

  1. Wet and dry alternation and freeze-thaw cycle damage

Freezing and thawing concrete damage is one of the more common diseases of concrete engineering in alpine regions, which is the damage caused by the physical action of concrete (dry and wet changes, temperature changes, freezing and thawing changes, etc.). The main cause of concrete freeze-thaw spalling is water in the concrete void, in the alternating wet and dry, freeze-thaw cycle, the formation of ice pressure and penetration pressure of the combined effect of fatigue stress, so that concrete from the surface to the inside of the spalling damage, thereby reducing the strength of concrete.

When after repeated cycles of freezing and thawing, the damage gradually accumulated and expanded, developed into interconnected cracks, so that the strength of concrete gradually reduced, and later even completely lost. From the actual is not difficult to see, in dry conditions in the concrete obviously does not exist the problem of freeze-thaw damage, so the state of full water is one of the necessary conditions for freeze-thaw damage to concrete, another necessary condition is the positive and negative changes in outside air temperature, so that repeated freeze-thaw cycle of water in the concrete pores, these two necessary conditions, to determine the freeze-thaw damage to concrete is the beginning of the concrete surface layer by layer corrosion damage.

Analysis of the causes of freeze-thaw damage to concrete  The alpine region cooling tower concrete structure in use in the process of cracking, spalling, defects and other quality defects are more common, the common reasons include the following two aspects  1.Wet and dry alternation and freeze-thaw cycle damage  Freezing and thawing concrete damage is one of the more common diseases of concrete engineering in alpine regions, which is the damage caused by the physical action of concrete (dry and wet changes, temperature changes, freezing and thawing changes, etc.). The main cause of concrete freeze-thaw spalling is water in the concrete void, in the alternating wet and dry, freeze-thaw cycle, the formation of ice pressure and penetration pressure of the combined effect of fatigue stress, so that concrete from the surface to the inside of the spalling damage, thereby reducing the strength of concrete.  When after repeated cycles of freezing and thawing, the damage gradually accumulated and expanded, developed into interconnected cracks, so that the strength of concrete gradually reduced, and later even completely lost. From the actual is not difficult to see, in dry conditions in the concrete obviously does not exist the problem of freeze-thaw damage, so the state of full water is one of the necessary conditions for freeze-thaw damage to concrete, another necessary condition is the positive and negative changes in outside air temperature, so that repeated freeze-thaw cycle of water in the concrete pores, these two necessary conditions, to determine the freeze-thaw damage to concrete is the beginning of the concrete surface layer by layer corrosion damage.  2.Chemical erosion and carbonation  Chemical erosion is mainly through the chimney gas containing so2, further oxidized to so3 in the air, the formation of chemical erosion of concrete, and with the reaction of ca (oh) 2 in concrete, the production of ca (so) 4, resulting in volume expansion. And ca(so)4 and concrete c3a reaction to generate calcium sulfur aluminate, resulting in *** times volume expansion, expansion stress so that the concrete swelling and cracking, crisp.  Carbonation is mainly the gas emission from the chimney to increase the co2 concentration in the surrounding air, long-term in the high concentration of co2 erosion, resulting in the tower, herringbone column of the concrete to produce carbonation, in the presence of moisture conditions, carbonation of the concrete due to shrinkage and lead to cracking.  Due to the carbonization of concrete and chemical erosion, the original passivation film on the surface of the reinforcement is destroyed, the reinforcement is corroded, and the volume expands, and the expansion stress cracks the protective layer of concrete, forming cracks along the reinforcement, i.e., along the tendon cracks, and then the collapse of the protective layer.  Application  1. High-strength repair material has high strength, high adhesion and good durability, suitable for reinforcement and repair of various types of severely damaged reinforced concrete structures, improving the durability of concrete, extending the service life of concrete, and preventing the erosion of concrete by water-carrying acids, alkalis, salts, co2 and other media.  2. Repair of defects, spalling, exposed ribs, honeycomb pockmarks, thickening of protective coatings, levelling.  3. Repair and consolidation of carbonated concrete.  4. Used for bridges, road surfaces, railway tunnels, hydraulic structures, underground garages, factory floors and other concrete repair.

  1. Chemical erosion and carbonation

Chemical erosion is mainly through the chimney gas containing so2, further oxidized to so3 in the air, the formation of chemical erosion of concrete, and with the reaction of ca (oh) 2 in concrete, the production of ca (so) 4, resulting in volume expansion. And ca(so)4 and concrete c3a reaction to generate calcium sulfur aluminate, resulting in *** times volume expansion, expansion stress so that the concrete swelling and cracking, crisp.

Analysis of the causes of freeze-thaw damage to concrete  The alpine region cooling tower concrete structure in use in the process of cracking, spalling, defects and other quality defects are more common, the common reasons include the following two aspects  1.Wet and dry alternation and freeze-thaw cycle damage  Freezing and thawing concrete damage is one of the more common diseases of concrete engineering in alpine regions, which is the damage caused by the physical action of concrete (dry and wet changes, temperature changes, freezing and thawing changes, etc.). The main cause of concrete freeze-thaw spalling is water in the concrete void, in the alternating wet and dry, freeze-thaw cycle, the formation of ice pressure and penetration pressure of the combined effect of fatigue stress, so that concrete from the surface to the inside of the spalling damage, thereby reducing the strength of concrete.  When after repeated cycles of freezing and thawing, the damage gradually accumulated and expanded, developed into interconnected cracks, so that the strength of concrete gradually reduced, and later even completely lost. From the actual is not difficult to see, in dry conditions in the concrete obviously does not exist the problem of freeze-thaw damage, so the state of full water is one of the necessary conditions for freeze-thaw damage to concrete, another necessary condition is the positive and negative changes in outside air temperature, so that repeated freeze-thaw cycle of water in the concrete pores, these two necessary conditions, to determine the freeze-thaw damage to concrete is the beginning of the concrete surface layer by layer corrosion damage.  2.Chemical erosion and carbonation  Chemical erosion is mainly through the chimney gas containing so2, further oxidized to so3 in the air, the formation of chemical erosion of concrete, and with the reaction of ca (oh) 2 in concrete, the production of ca (so) 4, resulting in volume expansion. And ca(so)4 and concrete c3a reaction to generate calcium sulfur aluminate, resulting in *** times volume expansion, expansion stress so that the concrete swelling and cracking, crisp.  Carbonation is mainly the gas emission from the chimney to increase the co2 concentration in the surrounding air, long-term in the high concentration of co2 erosion, resulting in the tower, herringbone column of the concrete to produce carbonation, in the presence of moisture conditions, carbonation of the concrete due to shrinkage and lead to cracking.  Due to the carbonization of concrete and chemical erosion, the original passivation film on the surface of the reinforcement is destroyed, the reinforcement is corroded, and the volume expands, and the expansion stress cracks the protective layer of concrete, forming cracks along the reinforcement, i.e., along the tendon cracks, and then the collapse of the protective layer.  Application  1. High-strength repair material has high strength, high adhesion and good durability, suitable for reinforcement and repair of various types of severely damaged reinforced concrete structures, improving the durability of concrete, extending the service life of concrete, and preventing the erosion of concrete by water-carrying acids, alkalis, salts, co2 and other media.  2. Repair of defects, spalling, exposed ribs, honeycomb pockmarks, thickening of protective coatings, levelling.  3. Repair and consolidation of carbonated concrete.  4. Used for bridges, road surfaces, railway tunnels, hydraulic structures, underground garages, factory floors and other concrete repair.

Carbonation is mainly the gas emission from the chimney to increase the co2 concentration in the surrounding air, long-term in the high concentration of co2 erosion, resulting in the tower, herringbone column of the concrete to produce carbonation, in the presence of moisture conditions, carbonation of the concrete due to shrinkage and lead to cracking.

Due to the carbonization of concrete and chemical erosion, the original passivation film on the surface of the reinforcement is destroyed, the reinforcement is corroded, and the volume expands, and the expansion stress cracks the protective layer of concrete, forming cracks along the reinforcement, i.e., along the tendon cracks, and then the collapse of the protective layer.

Analysis of the causes of freeze-thaw damage to concrete  The alpine region cooling tower concrete structure in use in the process of cracking, spalling, defects and other quality defects are more common, the common reasons include the following two aspects  1.Wet and dry alternation and freeze-thaw cycle damage  Freezing and thawing concrete damage is one of the more common diseases of concrete engineering in alpine regions, which is the damage caused by the physical action of concrete (dry and wet changes, temperature changes, freezing and thawing changes, etc.). The main cause of concrete freeze-thaw spalling is water in the concrete void, in the alternating wet and dry, freeze-thaw cycle, the formation of ice pressure and penetration pressure of the combined effect of fatigue stress, so that concrete from the surface to the inside of the spalling damage, thereby reducing the strength of concrete.  When after repeated cycles of freezing and thawing, the damage gradually accumulated and expanded, developed into interconnected cracks, so that the strength of concrete gradually reduced, and later even completely lost. From the actual is not difficult to see, in dry conditions in the concrete obviously does not exist the problem of freeze-thaw damage, so the state of full water is one of the necessary conditions for freeze-thaw damage to concrete, another necessary condition is the positive and negative changes in outside air temperature, so that repeated freeze-thaw cycle of water in the concrete pores, these two necessary conditions, to determine the freeze-thaw damage to concrete is the beginning of the concrete surface layer by layer corrosion damage.  2.Chemical erosion and carbonation  Chemical erosion is mainly through the chimney gas containing so2, further oxidized to so3 in the air, the formation of chemical erosion of concrete, and with the reaction of ca (oh) 2 in concrete, the production of ca (so) 4, resulting in volume expansion. And ca(so)4 and concrete c3a reaction to generate calcium sulfur aluminate, resulting in *** times volume expansion, expansion stress so that the concrete swelling and cracking, crisp.  Carbonation is mainly the gas emission from the chimney to increase the co2 concentration in the surrounding air, long-term in the high concentration of co2 erosion, resulting in the tower, herringbone column of the concrete to produce carbonation, in the presence of moisture conditions, carbonation of the concrete due to shrinkage and lead to cracking.  Due to the carbonization of concrete and chemical erosion, the original passivation film on the surface of the reinforcement is destroyed, the reinforcement is corroded, and the volume expands, and the expansion stress cracks the protective layer of concrete, forming cracks along the reinforcement, i.e., along the tendon cracks, and then the collapse of the protective layer.  Application  1. High-strength repair material has high strength, high adhesion and good durability, suitable for reinforcement and repair of various types of severely damaged reinforced concrete structures, improving the durability of concrete, extending the service life of concrete, and preventing the erosion of concrete by water-carrying acids, alkalis, salts, co2 and other media.  2. Repair of defects, spalling, exposed ribs, honeycomb pockmarks, thickening of protective coatings, levelling.  3. Repair and consolidation of carbonated concrete.  4. Used for bridges, road surfaces, railway tunnels, hydraulic structures, underground garages, factory floors and other concrete repair.

Application

  1. High-strength repair material has high strength, high adhesion and good durability, suitable for reinforcement and repair of various types of severely damaged reinforced concrete structures, improving the durability of concrete, extending the service life of concrete, and preventing the erosion of concrete by water-carrying acids, alkalis, salts, co2 and other media.
  2. Repair of defects, spalling, exposed ribs, honeycomb pockmarks, thickening of protective coatings, levelling.
  3. Repair and consolidation of carbonated concrete.
  4. Used for bridges, road surfaces, railway tunnels, hydraulic structures, underground garages, factory floors and other concrete repair.

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