Detailed Expansion Joints For Bridge Description:
Construction Process : 1. Cutting and crushing down the determined width of overlaid asphalt pavement to expose the bridge deck. 2. Cleaning the channel with pressured air and attaching tape at both sides : After removing fragments, dust, small amounts of moisture, and adhered extraneous substances, attach tapes at both right and left sides of the channel leaving a space. 3. Heating the channel and installing back-up rod :- After heating the channel with heat-lance th obtain the sufficient temperature (keep about 70C), install back-up rod. 4. First coating and installing steel support plate : - Coat the channel with Road seal sealant (2mm~3mm thick) and put steel support plate (thickness: 4~8mm) over the center of the joint gap. 5. Filling up the channel : - Coat the steel support plate again with Road seal sealant and the interior surfaces of the channel. - In the case of the expansion joints, mix heated aggregate (5mm~25mm) with Road seal sealant in the volume ratio of 60:40 (in the weight ratio of 75:25 (aggregate : sealant)) and fill this mixture into the channel 1 or 3 times according to its depth. The thickness of a mixture layer is about 5 to 10cm. Also, you must spread Road seal sealant between the mixture layers. 6. Finishing : Level off the top surface of the joint using heated squeezer or roller and cool it by sprinkling lime or talc powder over. It takes about 1~2 hours for vehicles to pass over newly completed joint.
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