With the economic development of social , the continuous improvement of the quality of bridge and highway projects, and the water damage and bottom leakage of bridge deck paving occurred during the construction of bridge deck paving, bridge deck waterproofing, as an important part of bridge deck paving, is increasingly being paid attention to.
and cross-sea bridge is in the marine environment, exposed to the air for a long time, exposed to hot sunlight, blowing by strong winds, erosion of rain and snow, temperature torture of severe cold and heat, and the changes in the temperature difference between day and night are repeated. If waterproof material does not have excellent performance and good protection measures, it is difficult to achieve the required durability period.
Cross-sea bridge Waterproof coating selection needs to have the following excellent properties:
- This material has good water permeability and is not affected by freeze-thaw cycle;
- Waterproof coating should have sufficient bonding strength with concrete bridge deck or asphalt pavement , and there must be no stratification, which does not ensure strength;
- waterproof coating has strong acid resistance and alkali resistance, so that the waterproof layer has excellent corrosion resistance;
- waterproof material should have good high temperature and low temperature resistance to prevent material characteristics from failing.
Waterproof coating performance introduction:
alkali resistance refers to the resistance of waterproof coatings to acid and alkali corrosion. refers to the change in the physical and chemical action between concrete and its environment that causes the decrease in the strength of concrete itself. It is mainly caused by the reaction of alkali aggregates, the erosion of chloride ion , and other damages such as rust and swelling of steel bars caused by this.
Experimental method: Under the prescribed conditions, soak the paint test board in a certain concentration of alkali liquid to observe whether it has whitening, loss of light, bubbles, and shedding.
salt treatment: There are many tiny voids in the concrete structure itself, and soluble salts may penetrate at any time during use. When the salt penetrates deep into the concrete, when the dry and wet alternate, the moisture evaporates, the salt crystals precipitate, and the crystal volume expands, causing the concrete to crack, loosen, and powder. It loses structural strength and the protection of steel bars, causing structural damage to concrete.
Experimental method: After soaking the sodium chloride solution at a specified concentration for 168 hours, rinse it with water, then suck it dry with cloth, and leave it under standard test conditions for 4 hours. Observe its tensile strength, elongation rate of fracture specimens, and low temperature flexibility.
Acid resistance: Carbon dioxide in the atmosphere, acid rain, acidic water, acidic soil, etc., can directly react with concrete, neutralize the alkali in concrete, and can also act with other components in concrete to cause corrosion. At the same time, the reduction of alkalinity in concrete can also accelerate the corrosion of its internal steel bars.
Experimental method: Under the prescribed conditions, soak the paint test board in a certain concentration of lye for 15 days to observe whether there are any phenomena such as layering, discoloration, bubbles, etc.
or above is the excellent performance of the bridge deck waterproofing materials of the cross-sea bridge. For cross-sea bridge projects, if the waterproof and anti-corrosion layer is constructed improperly or the corrosion-proofing measures are not taken directly, it is very easy to cause serious corrosion, resulting in failure and damage to the bridge and other hazards. The bridge-type waterproof coatings developed and produced by Songyuan can effectively enhance the corrosion resistance of bridges, thereby improving the service life of bridges.
