A gap filled with flexible material that separates sections of concrete, allowing them to expand and move without cracking.
A gap or assembly that allows independent movement between adjacent structural elements due to thermal expansion, shrinkage, seismic forces, or settlement. In concrete flatwork, expansion joints are filled with a compressible filler material and sealed with a flexible sealant. Unlike control joints, expansion joints separate the concrete entirely from top to bottom.
Expansion joints with closed-cell foam backer and polyurethane sealant were installed at all column bases in the floor slab.
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