Cement concrete road is only damaged on the surface, but the foundation and strength are stable, so it can be repaired accurately by using new energy technology materials. Cement pavement repair materials are widely used because of their good adhesion, compressive and wear resistance, waterproof and frost resistance. Using cement pavement repair materials to repair pavement diseases effectively reduces the construction cost and cost, and the construction is convenient and fast. Traffic can be restored in 2 hours, traffic congestion can be solved, and citizens can travel conveniently.
First,? Construction scheme of sand repair for cement pavement
1, bottom surface treatment
First, remove loose parts such as bulging, peeling and cracks, and roughen the parts below 3mm and oily parts. The method of roughening can be a professional milling machine or a manual beating with a sharp hammer. Clean up the bottom floating soil and other debris, and rinse it with high-pressure water. When flushing, the mud should be washed out of the operation surface and prevented from flowing back.
Step 2 stir the material
Mix and stir the materials with water (pollution-free water), and control the water addition within the range of 16% (mass ratio). Stirring: stirring must be fully uniform, and the stirring time should be about 3 minutes, not too long, to prevent solidification in the mixing barrel.
3, clean up the scour
The surface to be repaired is fully wet, and the surface is wet without Mingshui. If there is water in the potholes, dry the water with an air gun before construction. It is best to keep the operation surface wet but without Mingshui.
4. Repair
Used to repair pits, pits, peeling, nudity, fine cracks, etc. Pour the stirred material on the working face and spread it out with a large trowel. Lift the front end of the trowel slightly at an angle of 10 with the ground, and spread the material as little as possible (secondary plastering is not allowed).
5. Health and traffic control
After the final setting, cover with water for health preservation. When the temperature is above 20℃, traffic can be opened for 1-2 hours. ? When the temperature is low, the opening hours can be appropriately extended.
Second,? Problems needing attention in selecting repair materials for cement pavement
Cement pavement must have certain bonding strength, compressive and wear resistance, waterproof and frost resistance to meet the repair requirements. Six performance indicators should be paid attention to when selecting cement pavement repair materials:
1. Cohesion? 1.8 MPa； ? 2. compressive strength? 50Mpa3. Waterproof and frost resistance are above F 150; 4. The color after repair is basically consistent with the original pavement; 5. Durable service life; 6. The cost is 30% lower than that of the traditional process.
Huineng Company's materials and technologies for road, bridge, culvert and tunnel maintenance are widely used in airport, expressway, national highway, provincial highway, municipal, county and township road reconstruction and maintenance projects. Stable quality, fast and efficient, energy saving and environmental protection, benefiting society. Welcome people in the industry to put forward valuable opinions.