In winter, concrete pavement is prone to freeze-thaw, salt corrosion, peeling, sanding, exposure and other diseases. Even if these diseases are minor, if they are not repaired in time, the disease parts will become more and more serious, which will affect the traffic of vehicles. How to repair these diseases? What material is used to repair?
For surface diseases such as pitted surface peeling, salt corrosion, freezing and thawing, the "Emergency Repair Treasure BC thin layer" can be used to repair mortar The 3mm ultra-thin layer repair is realized, which reduces the project cost and avoids the high cost of large area board replacement. It can be opened to traffic 2-4 hours after the repair is completed, and the strength can reach 30MPA, the 7-day strength can reach 50MPA, and the peak value can reach 60MPA. The construction process is simple and easy to operate, just add water. The color of the repaired road surface is basically the same as the original road surface, and the heavy load will not peel off. It has good durability and relieving fatigue load capacity.
"Emergency Repair Bao BC Thin Layer" is a road rapid maintenance material produced by Xi'an Ruitai Emergency Repair Bao New Material Co., Ltd., a company integrating the research, development, production pin High tech enterprises sold in one cement The road maintenance industry has more than 20 years of experience in maintenance and construction. The rapid repair materials for cement pavement of the Emergency Repair Treasure series have won wide recognition from customers because of their excellent quality.
Product description
Repair Treasure BC thin layer cement pavement repair material aims at cement pavement exposure caused by pitting, peeling, sanding, freeze-thaw salt corrosion of cement concrete pavement gravel , exposed reinforcement and other diseases, which are directly applied to the diseased parts, have high compressive and bonding strength, so as to achieve rapid repair of ultra-thin cement pavement, and will not break and fall off under high-speed and high-pressure driving conditions. The repair quality is stable, the effect is good, and the service life is fully guaranteed.
It is applicable to the concrete ground of airports, expressways, national roads, provincial roads, municipal roads, urban and rural roads, industrial and mining plants, parking lots, gas stations, stadiums, community roads, etc.
Product performance
1. Fast passage: easy and fast to repair, and it can pass within 2h to avoid traffic jam.
2. Aesthetic degree: the color of the new pavement after repair is consistent with that of the original concrete pavement to keep the pavement clean and beautiful.
3. High bonding performance: using the bonding ability of the material itself and the principle of surface energy, the repair surface and the original concrete react into a unified whole, thus forming a very high bonding strength. The bonding strength can reach 1.6Mpa 2 hours after construction, which can be bonded with various disease parts. The bonding ability is basically not affected by the thickness, which can achieve ultra-thin layer repair, and the bonding strength can reach 1.6Mpa after expansion, rolling It will not fall off or break under external force such as pushing.
4. Strong compressive capacity: after curing, the repair material has a very high compressive and flexural capacity. The compressive strength can reach 25Mpa in 2 hours, and the strength continues to rise in the later period. The peak compressive strength can reach more than 100 Mpa. The heavy load pavement will not be cracked or broken when rolled.
5. Durability: faster early performance and higher early strength, and no attenuation in later period; The material itself has strong waterproof, frost resistance, acid salt corrosion resistance and direct light prevention capabilities. Its aging relieving ability is more than 5 times that of the original cement concrete. The performance degradation will not be earlier than the original concrete, and the bonding ability and compressive strength will not be lost due to aging.
construction technology
Basic requirements for step 1:
1. Construction conditions: the temperature shall be above 5 ℃, and construction cannot be carried out in rainy and windy days.
2. The construction personnel must have some experience in cement concrete construction, and understand the use method of this material before construction.
3. Construction machinery: Pavement milling machine , mortar mixer or manual mixing tools (refitted electric hand drill), high-pressure water washing equipment, bottom cleaning tools, high-pressure air gun, scraper ruler or small channel steel, sponge or mop (to absorb excess water), more than two iron mixing barrels, marked with several tapes and trowels.
4. The construction thickness should be more than 3mm.
Step 2 Bottom surface treatment:
1. Cleaning: remove the loose parts such as bulges, peeling, cracks, etc., and roughen the parts less than 3mm and the parts with oil stains. The roughening method can be either milling machine or manual hammering.
2. Cleaning: Clean up the floating soil and other sundries on the bottom surface, and wash them with high-pressure water. When washing, the slurry should be washed out of the working surface to prevent backflow.
3. Wetting: After washing with water, keep the water on the working surface for a period of time, and fully moisten the working surface until no water seepage.
Step 3: Mix materials:
1. Adding water: mix the material with water (clean water), and control the amount of water added at 17% - 19% for good aging effect.
2. Mixing: The mixing must be fully and evenly mixed, and the mixing time should be about 3 minutes, not too long, to prevent solidification in the mixing bucket.
3. Experience: According to experience, adding water before mixing will save time and labor. Because the setting time of this material is short, the amount of mixing at one time should not be too large. According to the working surface and construction progress, the materials mixed at each time should be completed within 20 minutes.
Step 4 Construction method:
1. Clean and wet the base course: when the repair surface is fully moistened, the surface is wet but there is no clear water. If there is water in the potholes, use an air gun to blow the water dry or use a sponge dry cloth to suck the water dry before construction. The working surface should be kept wet but there is no clear water. If the surface is too dry, re wet it by sprinkling, and keep the working surface dry and humid to facilitate bonding and construction.
2. Repair: for the repair of pits, pockmarks, peeling, exposed bones, small cracks, etc., pour the mixed materials on the working surface, spread with a larger trowel, slightly lift the front end of the trowel to form a 10 ° angle with the ground, and try to reduce the number of board returns; If it is difficult to find peace, it should be kept still for two to three minutes and then smoothed. The construction personnel can drill on a small area to understand the characteristics of materials and constantly summarize experience and construction skills.
3. For the repair of cracks, gnawing edges and wall collapses: the cracks can be aligned as far as possible, widened and deepened, and a regular groove with a width of 5cm and a height of 5cm can be expanded. The repair material is added to a certain proportion of aggregate (1:1-3), mixed and filled into the prepared groove, compacted and leveled.
4. For the repair of broken plates, broken corners and staggered plates: remove all moving plates at the diseased parts, and add a proportion of aggregate into the repair material to mix and fill. The addition of multiple aggregates can greatly reduce the repair cost. After the repair, traffic can be opened 2-4 hours later, especially for sections where the closed traffic time should not be too long.
5. Precautions: the initial setting time of this material is short, and it will have adhesiveness during initial setting, which is not conducive to leveling, so first use a scraper to pave a large area and then use an iron trowel to level and polish locally (to avoid secondary plastering).
Step 5 Health preservation and public transportation
After the repair is completed, water shall be sprayed immediately for curing after the final setting (it can not be cut with thumb nail). When the temperature is above 20 ℃, the public transportation can be started within 2-4 hours (up to C30). When the temperature is low, the opening time can be appropriately extended. Step 6 Construction experience
Because the initial setting time of this material is short, the material can be leveled by paving as few times as possible; Cavities and faults shall be avoided during construction, especially at the joints with the bottom surface. When paving, a thin layer shall be scraped first, and the required thickness shall be paved immediately after observing that all concave and convex points have full contact with materials. If the large thickness of pits and grooves are not piled up at one time, they shall be filled in layers to be dense and even, but this link is continuous and cannot be separated, Otherwise, layering will occur.
