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FAQ

Nanjing Avida Engineering Materials Co., Ltd

*Can you produce as my request?
Yes, we can produce as customized design.
                                                                                                                                                                                      
*Are you factory?
Yes, we are munufacturer located in Nanjing. Welcome to visit our factory.
                                                                                                                                                                                      
*How do expansion joints in bridges work?
Expansion joints can also be found in steel work and on railway lines . ... You may have noticed expansion joints in common materials like concrete roads or in bridges. These joints are spaced so that individual pieces of a road may grow or shrink in length without pushing or pulling on other sections of the structure.
                                                                                                                                                                                      
*What is an expansion joint on a bridge?
An expansion joint or movement joint is an assembly designed to safely absorb the temperature-induced expansion and contraction of construction materials, to absorb vibration, to hold parts together, or to allow movement due to ground settlement or earthquakes.
                                                                                                                                                                                      
*Why do bridges have expansion joints?
Bridges are made of steel, which expands and contracts with temperature. A span long enough to need expansion joints may expand or contract several inches in the course of a year. Without those joints, either the bridge butt joints would crush and buckle in hot weather, or the bridge would pull apart in cold weather.
                                                                                                                                                                                      
*What is difference between construction joint and expansion joint?
Expansion joints are generally placed at various intervals to allow for the expansion/contraction of the material of the bridge (or any structure). In the case of bridges, the joint left is filled with a flexible filler that will expand/contract with the joint as it gets longer/shorter due to climate.
                                                                                                                                                                                      
*How does thermal expansion affect bridges?
Thermal expansion can affect bridges with either expanding or contracting the bridge (or, by essentially distorting it's shape). If a bridge gets very heated, the road bed will expand. On the other hand, if the bridge is cooled, the road bed will retract.
                                                                                                                                                                                      
*How far apart should expansion joints be?
Space joints (in feet) no more than 2-3 times the slab thickness (in inches). A 4" slab should have joints 8-12 feet apart. Cut joints deep enough. Cut joints 25% of the depth of the slab.
                                                                                                                                                                                      
*When should I cut my control joints?
The timing varies depending on the temperature and the relative humidity, but the window is generally 4 to 12 hours after concrete placement. The cut depth should be at least ? the thickness of the slab. For decorative work or smaller slabs, a regular dry-cut cut-off saw can be used.
 
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