Beijing Wanji Jianye Building Materials Co

How to repair cracks in concrete with epoxy resin Manager Ma
Question How to repair cracks in concrete with epoxy resin?
Answer to the applicable conditions
It is widely used in glue injection repair of cracks in concrete bridges, houses, water conservancy, pavement and other projects, as well as reinforcing glue injection repair of penetrating cracks in large structures and deep and winding cracks.
Reinforcing and repairing defects such as honeycomb and looseness inside concrete.
, FRP anti-corrosion, structural surface coating anti-corrosion construction.
, long-term working environment temperature, ℃.
The construction environment is dry and ventilated, and the pasting surface is clean, dry and free of oil.
The curing environment temperature should not be lower than ℃.
When the ambient temperature is ℃, the complete curing time is days.
Technical performance
The technical performance of epoxy resin (crack repair) glue is in line with the national standard "Design Specification for Reinforcement of Concrete Structures" (,) and the Ministry of Transport industry standard "Design Specification for Highway Bridge Reinforcement" (/, ) grade glue requirements.
Usage methods and construction points
Joint surface treatment, glue, joints, injection nozzles, glue filling
, crack treatment
For small cracks in concrete components, use Use tools such as wire brushes to remove dust, scum, loose layers and other dirt on the surface of concrete cracks. Brush off the floating dust and wipe it clean with alcohol or along both sides of the cracks.
For larger concrete components or deeper cracks, drilling holes can be used to pour glue along the cracks so that the glue has a wider path to enter the cracks.
, Set up the base of the glue filling nozzle
The glue filling nozzle must be installed at the intersection of cracks, the wider cracks and the ends of the cracks. The distance between the glue nozzles can be determined according to the crack size, direction and structural form. There must be a glue inlet, exhaust or glue outlet on a crack. The base of the glue filling nozzle can be pasted in place with seam sealant first, or it can be pasted together when sealing the seam.
Special attention should be paid to preventing clogging of the glue filling nozzle.
, Sealing
The quality of sealing directly affects the grouting effect and quality, so special attention should be paid to it. Sealing glue can be used to seal cracks. Weigh and mix the sealing glue according to the recommended glue proportion. Use a putty knife to repeatedly scrape along the cracks and then apply a layer of glue evenly, taking care to prevent small air bubbles or loose sealing.
The seam sealing glue cures quickly and has strong bonding. It needs to be used as needed. It is a special glue for crack sealing and base bonding used in the automatic pressure grouting process. Glue injection can be carried out within minutes after the sealing seam is intact
Prepare the glue solution for continuous glue injection
Special glue injection equipment should be used for the glue injection operation. Prepare the grouting resin according to the proportion, pour it into the hose, tighten the grouter containing the resin on the base, and loosen the spring to inject glue. Depending on the size of the crack area, single hole grouting or zoned group hole grouting can be used. The grouting on a crack can be from shallow to deep, from bottom to top, and from one end to the other. If the resin is insufficient, it can be replenished repeatedly. The grouting pressure is often injected using an automatic pressure grouter. While ensuring smooth grouting, lower grouting pressure and longer grouting time can be used to obtain better grouting results. Remove the grouter and twist the plug into the base to prevent glue from escaping.
, glue curing
Epoxy resin (crack repair) glue should be cured in an environment above ℃, and the curing time depends on the ambient temperature.
Inspection of the grouting effect
After the grouting is completed, the grouting effect and quality should be inspected. If there are any unqualified conditions such as lack of density, refilling should be carried out.
Packaging, transportation, storage and safety
It should be stored in a sealed manner in a dry and clean warehouse with an ambient temperature of ℃℃. It must not be stacked in the open or exposed to rain. Different types of adhesives and adhesives must not be stored for a long time after the packaging is opened. Components should be clearly labeled and stored to avoid confusion. From the date of production, the effective storage period is months if the packaging is intact.
This product is not a flammable, explosive, toxic or dangerous product and can be transported by ordinary means of transportation. During transportation, the packaging must not be damaged, exposed to sunlight or rain, and must not be tilted or inverted.
. Workers constructing this product should take necessary safety protection measures (such as wearing masks, gloves, goggles, hard hats, etc.). Pay attention to fire prevention and maintain good ventilation on site. If it accidentally gets on the skin or clothing, please immediately remove it. Wipe it clean and rinse with plenty of water. If you accidentally eat it or splash it into your eyes, please seek medical attention immediately.
The above content is compiled based on the problems encountered by students in actual work for reference. If you have any questions, please contact us in time. Communicate and correct.