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Bridge Expansion Joint

BUSINESS

Bridge Expansion Joint

EGIS Joint Construction Method
Bridge expansion joint using high molecular reforming elastic seal material enhances waterproof problem which is occurred at space between upper structures with continuty of pavement portion and road surface platness. So it is the construction method to solve problem of vibration and noise reason by passing vehicles simultaneously and to secure safety and high speed ability of vehicles.
Quality criteria of high molecular reforming elastic seal material
Items Criteria Testing Method
Cone Penetration (25℃, 150g, 5 Sec.) Under 75 ASTM D 6297
Cone Penetration (-18℃, 200g, 60 Sec.) Over 100
Elasticity Recovery Rate (25℃, 75g) 40~70%
Flow Degree (60℃,5hr) Under 3.0
Asphalt Suitability
(Asphalt Compatible)		 All serene
Adhesivity (-7℃) All serene
Low Temperature Flexibility (-23℃) All serene
Softning Point Over 83 ASTM D 36
Ductility (25℃, 5cm/min) Over 40 ASTM D 113
Adhesion in Tension - Expansion coefficient at fracture Over 700 ASTM D 5329
Considerattion of raised problem from high molecular reforming elastic seal materia expansion joint
1. Adhesivity(Bond)

As described at STM D 532, it pushes concrete block with blotting paper on 1+2 inches section, and dries in the air during 2 hours. pours it into specimen, makes sealant block in width of 0.500±0.005 inches interval. When curing is over, cuts off residual sealant, leaves specimen at 20℉(-7℃) over 4 hours, enlongates it at 100% of 1/2 inch with 0,135 inch per hour. As described at STM D 532, it repeats cycle of re-compression and re-eleogation 2 times more, completes test with 3 times cycle in 5 days.

Items Unit Test Method Criteria Test Result
Adhesivity
(-7℃, 100% expansion, 3cycle, Width 12.7mm)		 - ASTM D 6297 All serene All serene
※ It is test result which was requested to Korea Conformity Laboratories for testing and there is no problem in Adhesivity.
2. Adhesion in Tension - Expansion coefficient at fracture-Breakdown, pitting)

It proceeds same procedure as adhesivity. When curing is over, cuts off residual sealant, enlongates specimen to francture with 0.5±0.1 in/min(12.7±2.54 mm/min) at Standard Condition(23±2℃, 73.4±3.6 ℉), according to the result, it completes test calculating expansion coefficient at fracture.

Items Unit Test Method Criteria Test Result
Adhesion in Tension
(25℃, Width12.7mm/min)		 % ASTM D 5329 Over 700% 727%
※ It is test result which was requested to Korea Conformity Laboratories for testing and there is no problem in Adhesion in Tension - Expansion coefficient at fracture.
3. Elasticity Recovery Rate, Ductility
Items Unit Test Method Criteria Test Result
Elasticity Recovery Rate
(25℃, 75g)		 % ASTM D 6297 40%~70% 46.5%
Ductility
(25℃, 5cm/min)		 cm ASTM D 113 Over 400mm 450mm
※ It is test result which was requested to Korea Conformity Laboratories for testing and there is no problem in Elasticity Recovery Rate & Ductility
Expansion Joint Construction Example
1. Bridge Logitudinal Expansion Joint

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2. Bridge Transverse Expansion Joint

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3. Rahmen bridge Joint Portion

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