The construction process has been the formation of cracking measures only two kinds, that is, according to the degree of cracking of concrete, the impact and location of treatment.
A; cracking has no effect on the structure does not affect the strength and quality of the structure; then use high-strength cement slurry perfusion surface,Road Router Crack focusing on reinforcement.
Second, the impact of cracking on the structure to form through the joints affect the quality and strength of concrete; then only chisel in addition to re-casting,high tech infrared asphalt repair equipment according to the specification construction.
3. If the crack does not affect the construction quality and strength, conditions permit and crack rules can be made into expansion joints.
On the existing road crack treatment methods:
1. When the pavement due to cracks caused by insufficient strength, the use of reinforcing materials (such as epoxy resin materials); when the road surface only through cracks,save oil concrete finishing equipment wholesale panel strength to meet the requirements, the use of sealing repair materials (such as polyurethane Grouting material).
⑴ direct grouting method: for non-expansion of shrinkage cracks. ① the slit clean up; ② sewn and road by brushing method of laying a layer of polyurethane adhesive layer, thickness 0.3 ± 0.1mm, the amount of 0.15g / m2 primer; ③ ready grouting material,Environmentally friendly heating equipment market poured into the seam , After curing the opening.
⑵ injection grouting: for 0.5mm below the non-expansion of the surface cracks (pressure grouting) or about 3mm cracks (syringe grouting). ① the slit clean up; ② with a good filling material; ③ with compressed air nozzle or syringe grouting; ④ heat cured after the opening.
⑶ expansion joint infusion method: for less than 3mm of minor cracks. ① along the cracks with the impact drill to widen the slot into 1.5 ~ 2.0cm groove, the maximum depth of not more than 2/3 plate thickness; ② the slit clean up, fill the particle size of 0.3 ~ 0.6 cm clean small stone chip Mud content of less than 1%); ③ with a good grouting material, filling joints; ④ heat curing, to reach strength after the opening.
