What kind of seam should be set on the concrete pavement? What's the function?
There are expansion joints and contraction joints on the concrete pavement.
When a day or a period of time after the end of operation (half), should be off mode, in order to re construction of a complete working seam, this one is the joint construction joints, therefore in the construction process of cement concrete pavement, the operation time should be controlled to control in the joint construction joint position. Construction joints shall be treated in accordance with the shrinkage joint method, and play the role of scaling.
Set up the concrete pavement joint seam and contraction joints. After pouring concrete pavement shrinkage joint, strength has not reached the design strength (such as second days) saw the cutting machine, cutting depth must meet the concrete pavement thickness 1/3, if the temperature drops, due to thermal expansion and contraction of concrete plate along the kerf in addition to disconnect no, caused by irregular broken plate. Is an expansion joint in pouring concrete slab, with soft wood will be separated from the concrete plate adjacent (middle and dowel bars), it is the role of the heat expansion, the concrete slab has certain space, avoid the heat when the concrete slab concrete slab arch suspended, the pavement damage
The difference between expansion joint and contraction jointExpansion joints: prevent concrete cushion when temperatures rise in the contraction joint edge crush or arch and set expansion joints.Contraction joints: prevent irregular cracks in the concrete cushion temperature reduced and the setting of the contraction joints.
