Expansion Joint Repair Technology

Features of polymeric fast structural repair material

Rapid structural repair material is a super-early-strength concrete structural repair material prepared with cement as the basic binding agent, high-strength material (quartz sand) as the main aggregate, supplemented with polymer powder, high-efficiency water-reducing agent, early-strength agent, expander, anti-separation and other substances.

This product has good self-flow, fast hard, early strength, high strength, no shrinkage, micro-expansion; non-toxic, harmless, non-aging, no pollution to water and the surrounding environment, self-compacting, rust resistance and so on.

Applications of polymeric fast structural repair materials

Mainly used in: The rapid repair of bridge expansion joints cement concrete pavement broken plate rapid repair.

Expansion joint damage repair technology

Step 1: Break out the old expansion joints

Step 2: Clean up the wet substrate

Step 3: Mix polymeric fast structural repair material

Step 4: Pave and maintain 2 hours of traffic.


Rapid repair technology for concrete pavement damage and broken slabs

Construction process

Cleaning: For the broken concrete pavement slab or concrete structure severely damaged parts, use a wind pick to crush the broken slab into small pieces and remove them, remove the loose materials around the slab base thoroughly, and use an air compressor to blow the dust off the base surface and the trough.

Base surface wetting: Wet the base surface with water 2 to 3 hours before pouring and remove the open water; during winter construction, wet the base surface with warm water not more than 65℃ before pouring and remove the open water.


Interface treatment: Brush a layer of polymer interface agent evenly on the substrate.

Support mold: For the concrete road slab to be repaired in the middle of the road, use the surrounding slab edge as a template; for the concrete road slab to be repaired at the edge of the road located in the cement concrete road slab, the three sides of the surrounding slab edge can be used as a template, the side should be supported by a wooden mold or steel mold, and take measures to prevent slurry leakage.

As for the seriously damaged part of concrete structure, it should support shaped formwork and take measures to prevent slurry leakage.

Preparation and mixing: According to the quantity and speed of pouring at the site, put the repair material into the forced mortar mixer by hand, dry mix for 10s, weigh it according to the amount of water added, then add water and mix in two times: The first time add 2/3 water and mix for 30s; the second time add 1/3 water and mix for 150s. After mixing, the repair material should stand still for 2~3min, and then pour after the bubbles disappear. In winter construction, warm water not exceeding 65℃ should be used for mixing, and the pouring temperature should be above 10℃.

Pouring: Pour the container slowly and evenly to make it dense, and avoid the phenomenon of empty drum when pouring. After pouring, smooth out the top surface of the patch. The time from the beginning of mixing to the end of pouring shall not exceed 30 min. Repair material that exceeds the time limit or whose fluidity does not meet the pouring requirement shall not be used further.

Wellness: Cover the top surface of the patching material with plastic strip, and then completely cover it with a straw bag to keep it moist. At room temperature, the raising can be terminated after 3~4h, or the raising can be terminated according to the structural strength requirements and the results of the strength test of the reserved specimens. Winter insulation measures should be used, the convalescence period should be extended.

Expansion Joint Repair Technology


  1. It is appropriate to use potable water for the mixing of repair materials.
  2. Jz type should follow the product requirements to choose the appropriate amount of water to control the degree of collapse and the degree of expansion of collapse.
  3. The template used for repairing the bridge structure should be a new template to ensure the beautiful appearance after dismantling the mold.
  4. The machines should be cleaned with water in time for the next use after construction.
  5. During the transportation of materials, rainproof measures should be taken.
  6. Materials should be stored in a cool, dry place, shelf life of 6 months, beyond the shelf life of re-inspection can be used only after passing.
  7. When used on site, it is forbidden to mix any additive or external adulterant into the material.

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