The replacement of the joint filler should be carried out during the season when the local temperature is low.

Use an air compressor to remove debris from the joint, place a grouting nozzle every 50 centimeters, seal the joint with tape, and add rosin paraffin wax (rosin paraffin wax=1:2 ratio for heating and melting) to the grouting nozzle and tape.

Then, it should be left for 3-5 days or when the joint is completely dry, without a water jacket saw, with a depth of up to 4.5 to 5 cm, and the dust inside the joint should be blown dry with an air compressor.

The hard objects squeezed in will cause the slab edge to expand and crack, and rain, snow, and water can seep into this gap, Damage to the base layer and cushion layer, resulting in the formation of holes, causing deformation of the plates, and pumping mud until damage occurs.

Pouring polyurethane modified asphalt joint filler can improve the quality of joints.

The filling material should be replaced every 3-5 years to avoid the formation of gaps in the joints after the aging of the filling material, which can cause mud, sand, stone, and other debris to invade and become obstacles to the expansion of the slab.

Another method is to use a new type of room temperature joint filling material, the specific operation is the same as above, but the joint filling material should have a 5-10mm expansion space reserved during the winter and spring seasons, and should be full during construction in the summer and spring seasons.

At this time, the longitudinal and transverse joints have large openings for easy cleaning.

Finally, press the epoxy solution into the joint.

The lower part of the joint can be filled with 15-20cm high foam plastic fillets, which can not only reduce the amount of joint filler, but also facilitate future joint cleaning.

Through successful experiments, we have changed the traditional practice of taking away excess sealant from the seams.

Fixing Socket Cross Pin Nail Plate

Its advantages are: firstly, it extends the service life of the joint filler (first aging the excess joint filler on the joint, then aging the joint); secondly, it makes up for the shortcomings in the manual joint filling construction; thirdly, it removes the contradiction between thermal expansion of the joint filler, and avoids the secondary joint filling; fourthly, it saves manpower, material resources and financial resources, and ensures the project quality.

01 Joint repair joint is a weak part of cement concrete pavement slabs and a key focus of pavement maintenance.

If the conditions are not met or the crack damage is relatively light, the joint can also be directly sealed with sealing material
.

Due to the hydration effect of cement, untimely concrete cutting and pressing joints, insufficient and uneven roadbed strength, and many other reasons, it can cause damage to road surface slabs, cross cracks between longitudinal and transverse directions, plate corner fractures, mesh cracks, and cracks.

Before filling the joints, a water saw (with a thickness of 5cm) should be used to cut the longitudinal and transverse joints, with a depth of up to 4 cm, to reduce the loss of the saw blade.

For non expansive surface cracks with a width of less than 0.5mm, pressure injection grouting method can be used.

b.

The boiled joint filler (temperature controlled at 130-140 ℃) can be poured into the blown vertical and horizontal joints with a leaky spoon.

02 Crack Repair 1 Pressure Injection Grouting Method a.