Damaged repair and anti-corrosion coating of bridge concrete anti-collision guardrail

The early deterioration of concrete bridges and anti-collision walls always occurs in large numbers.
The main reason for the damage is that the concrete components are directly exposed to the natural environment and are exposed to acids and alkalis, especially salt and snow melting agents
.

Common snow melting agents are inorganic snow melting agents with "chloride salt" as the main component, such as sodium chloride, calcium chloride, magnesium chloride, potassium chloride, etc.

The other type is an organic snow melting agent with "potassium acetate" as the main ingredient.
This type of snow melting agent has a good snow melting effect and basically has no corrosion damage, but its price is too high, and it is generally used in important places such as airports
.

The erosion, corrosion, neutralization, freeze-thaw damage of the concrete anti-collision wall caused by the snow melting agent, the ubiquitous alkali-aggregate reaction, often occurs within a few years, such as cracks, concrete peeling and barring, etc.
The traditional use of cement mortar to repair , Spalling occurs in a short time, affecting the service life and appearance of the anti-collision wall.
In severe cases, it will cause serious corrosion of the anti-collision wall steel bars, which will weaken the safety performance of the anti-collision wall and form a safety hazard
.

Commonly used snow melting agents are mainly salt.
The salt on the pavement melts the ice and then flows with the snow
.
After the salt enters the ground, it will inevitably cause pollution to the local groundwater resources.
Eating water polluted by snow melting agents will cause serious harm to human health
.
Since there is no standard for the use of industrial salt, and most of industrial salt contains nitrite, the negative damage of snow melting agent cannot be underestimated
.
The environmentally friendly snow melting agent (calcium chloride) currently on the market is not environmentally friendly
.
As long as it is a deicing agent, it will more or less affect the environment
.
Chemically speaking, sodium chloride and calcium chloride are both salts, which can damage bridges and concrete to varying degrees
.

Using "special composite repair mortar for anti-collision wall", it can be repaired firmly for a long time, repairing anti-collision wall steel bar corrosion and concrete deep damage, anti-collision wall surface repair, according to the degree of damage, the repair thickness is different, and the bottom of the anti-collision wall is about 30cm.
In severe cases, the ribs can be exposed in severe cases, up to 5-10cm deep, and the upper part is generally lighter.
Generally, it needs to be repaired as a whole to maintain the consistency of the color and the durability of the anti-installation wall
.

The use of "fluorosilicon system bridge special anticorrosive coating" combines the advantages of permeable and film-forming concrete protective materials, and through clever molecular design, the protective material forms a three-layer protective system, which can effectively increase the service life of concrete and has a good The decorative effect

"Fluorine-silicon system bridge special anti-corrosion coating" can penetrate into concrete 1mm-3mm, and chemically react with the active ingredients in the concrete to form a firm silicate structure.
At the same time, the film-forming coating gives the material good anti-aging performance, High and low temperature resistance, chemical corrosion resistance and color toning performance
.
"Fluorine-silicon system bridge special anti-corrosion coating" is a two-component protective material with excellent resistance to chloride ion erosion, acid and alkali erosion, waterproof, breathable, and anti-carbonization properties, which can effectively increase the service life of concrete structures and improve concrete Appearance
.

Compared with acrylic paint, silicon-acrylic paint and water-based fluorocarbon paint, concrete anticorrosive materials have more excellent water resistance, chloride ion corrosion resistance and freeze-thaw cycle resistance.
At the same time, the "fluorosilicon system bridge special anticorrosive coating" The water vapor transmission rate of the coating film is as high as 70%, which effectively avoids the decline or even failure of the protective ability caused by the coating film bulge
.

"Special composite repair mortar for anti-collision wall" construction technology:

Cleaning:

(1) Use high-pressure water gun (pressure not less than 20MPa), sandblasting or manual polishing to clean up the floating ash, floating slurry and loose parts on the concrete surface

(2) The concrete surface partially contaminated by oil should be treated with lye, detergent or solvent, and washed with water to neutrality
.

Construction of special repair mortar for anti-collision wall:

(1) After the surface treatment of the concrete structure meets the requirements, the construction of "special repair mortar for collision wall" can be carried out
.

(2) Prepare "Special Repair Mortar for Anti-collision Wall" according to the ratio specified by the manufacturer, calculate the amount of "Special Compound Repair Mortar for Anti-collision Guardrail" according to the used area, and mix it with a hand electric drill or manually mix it evenly for use;

(3) Using batch scraping or smearing method, use "special repair mortar for anti-collision wall" for obvious defects such as cracks, honeycombs and holes, and then fully scrape "special composite repair mortar for anti-collision guardrail" to control the "special repair of anti-collision wall" The thickness of mortar is 3mm-50mm;

(4) The viscosity of "Special Repair Mortar for Anti-collision Walls" can be controlled by adding or subtracting water according to the needs of on-site scraping.
The water consumption is less than 16%±1 of the total mass of "Special Repair Mortar for Anti-collision Walls"
.

(5) Use an electric grinder or sandpaper to smooth the completely solidified "special repair mortar for anti-collision walls", which is convenient for the next process construction
.

"Special composite repair mortar for anti-collision wall" repaired effect:

"Fluorine-silicon system bridge special anti-corrosion coating"

Excellent waterproof and anti-chloride ion corrosion performance, can reduce more than 90% of water penetration and more than 85% of chloride ion penetration, greatly delaying the deterioration of concrete; excellent weather resistance, after high and low temperature cycles, artificial aging and ultraviolet radiation, Coating performance remains intact; excellent resistance to carbonization, can greatly delay the rate of carbonization of concrete; resistance to chemical corrosion such as acid, alkali, salt, etc.
; good water vapor permeability, water vapor transmission rate of up to 70%; color adjustable , Provide color samples in GSB16-1629-2003 (mainly cement gray and beige, customized if you have special requirements), with bright, semi-gloss and matte effects, which can decorate concrete; water-based system, green and environmentally friendly ; It has good adhesion to the substrate, it can be rolled, brushed and sprayed, and it can penetrate into a film at low temperature, and it is very easy to construct;

"Fluorine-silicon system bridge special anti-corrosion coating" construction technology:

Foundation treatment: For newly-built concrete structures, the surface must be clean, free of oil, floating ash and coniferous material

After the "special composite repair mortar for anti-collision guardrail" is completely dry or 2h, the "fluorosilicon system bridge special anticorrosive coating" can be applied (the temperature is above 0℃, and a good ventilation environment is the standard)

Coating thickness control: use a coating thickness gauge to measure the thickness of the fluorine-silicon system bridge-specific anti-corrosion coating coating for one pass, and the thickness is controlled at about 80μm

Effect of "Fluorosilicon System Bridge Special Anticorrosive Coating" after painting: