Joints in liquid retaining concrete structures are important part of its design as joints are required as per size and position of structure.
Contraction Joints
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Sealing of Various Types of Joints in Building Construction

Protection systems of joints include the sealing of cracks, contraction (control) joints, expansion joints, and construction joints. Joint sealants in concrete minimize the intrusion of liquids, solids, or gases, and protect the concrete against damage.