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08/06
2016
Concrete surface treatment and reinforcement corrosion caused by carbonation - under the influence of accelerated carbonation conditions
Figure 6.7 is the experimental results of steel corrosion accelerated carbonation and wet and dry cycles. Water cement ratio of 0.4 and 0.6 of concrete was used in the experiment. Accelerated carbonation test using ordinary concrete for a long time
TAG:
Concrete
08/06
2016
Concrete surface treatment and reinforcement corrosion caused by carbonation - under the influence of atmospheric conditions
Carbonation is one of the important environmental factors that lead to corrosion of steel bars in concrete. In front of it has been talked about, concrete carbonation caused by steel corrosion without obvious anode and cathode, steel corrosion is relatively uniform. Carbonation is closely related to the permeability of concrete, and the surface treatment of silane penetration coating will not affect the permeability of concrete.
TAG:
Concrete
08/05
2016
Concrete surface treatment and chlorine ions cause corrosion of steel
Research data show that the sodium chloride and concrete components together into the new mixed concrete, when the chloride content of cement quality 0.4%~0.8%, steel corrosion significantly.
TAG:
Concrete
08/05
2016
Concrete surface treatment and chloride ions lead to corrosion of steel bars
Waterproof treatment of concrete surface chloride ion erosion tests show that, the waterproof processing can form on the surface of concrete chloride ion good isolation layer, by reducing capillary water absorption effect to prevent chloride ion invasion, significantly reduced the content of chloride ion in concrete. At the same time, the surface treatment of the permeable coating does not affect the internal water loss. When the relative humidity of concrete is reduced to a certain degree, the corrosion rate of the steel bar will obviously decrease.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete—— the influence of coating type
Compares the effect of concrete carbonization coating surface treatment of outdoor environment after the rain infiltration, as shown in figure 5.13. The results showed that the treatment effect was better than that of the emulsion with the same amount of surface treatment and the same number of times.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete -- the influence of water binder ratio
After silane penetration coating surface treatment, the concrete still has good air permeability, concrete internal moisture can be evaporated from the surface, it will not affect the diffusion and migration of CO2 to the concrete interior. Figure 5.4 for the water content of up to 9% of the cement mortar test block with silane surface treatment, dry conditions in the natural environment. After 3D, the residual moisture content is 3%~4%, the evaporation rate of water is close to that of common cement test block, which shows that the surface treatment does not affect the moisture content of the concrete, that is, it will not affect the permeability of the concrete. In view of this, permeable coating surface treatment of concrete while reducing the gross of water, but the permeability and no change, after surface treatment of concrete of with and without surface treatment of concrete carbonization performance should be basically the same.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete -- the influence of concrete moisture diffusion
Concrete internal humidity conditions on its carbonation development influence, no pressure head in the water can only be in the form of vapor through the surface processing layer, the presence of water repellency change the concrete internal moisture diffusion process, and also changed the carbonization of the concrete development.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete -- the influence of coating amount and processing times
As the research penetration type paint usage and processing times on carbonation resistance of concrete after surface treatment, the literature on the use of silane emulsion, surface treatment of concrete with different dosage and different times of paint, then placed outdoors in the rain under the environment of study carbonization of the concrete situation. Results as shown in Figure 5.10, visible, with permeable coating to the increasing use of, concrete carbonation velocity coefficient decreases, anti carbonization ability is enhanced; when the penetration type coating amount is the same repeatedly processing than word processing carbonation effect is good. Similar conclusions are obtained in the literature, as shown in Figure 5.11.
TAG:
Concrete
08/05
2016
Surface treatment on concrete carbonation - the external environment
After the surface treatment under different environmental performance of concrete carbonation, comparing the three different environments After silane surface treatment of concrete carbonation rate coefficient not, as shown 5.6. From FIG.
TAG:
Concrete
08/05
2016
Concrete surface treatment and chloride ions lead to corrosion of steel bars
Waterproof treatment of concrete surface chloride ion erosion tests show that, the waterproof processing can form on the surface of concrete chloride ion good isolation layer, by reducing capillary water absorption effect to prevent chloride ion invasion, significantly reduced the content of chloride ion in concrete. At the same time, the surface treatment of the permeable coating does not affect the internal water loss. When the relative humidity of concrete is reduced to a certain degree, the corrosion rate of the steel bar will obviously decrease.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete—— the influence of coating type
Compares the effect of concrete carbonization coating surface treatment of outdoor environment after the rain infiltration, as shown in figure 5.13. The results showed that the treatment effect was better than that of the emulsion with the same amount of surface treatment and the same number of times.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete -- the influence of water binder ratio
After silane penetration coating surface treatment, the concrete still has good air permeability, concrete internal moisture can be evaporated from the surface, it will not affect the diffusion and migration of CO2 to the concrete interior. Figure 5.4 for the water content of up to 9% of the cement mortar test block with silane surface treatment, dry conditions in the natural environment. After 3D, the residual moisture content is 3%~4%, the evaporation rate of water is close to that of common cement test block, which shows that the surface treatment does not affect the moisture content of the concrete, that is, it will not affect the permeability of the concrete. In view of this, permeable coating surface treatment of concrete while reducing the gross of water, but the permeability and no change, after surface treatment of concrete of with and without surface treatment of concrete carbonization performance should be basically the same.
TAG:
Concrete
08/05
2016
Effect of surface treatment on carbonation of concrete -- the influence of concrete moisture diffusion
Concrete internal humidity conditions on its carbonation development influence, no pressure head in the water can only be in the form of vapor through the surface processing layer, the presence of water repellency change the concrete internal moisture diffusion process, and also changed the carbonization of the concrete development.
TAG:
Concrete
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