construction joints in architecture - construction

construction joints

1. CONSTRUCTION JOINTS Presented by : Kavitha P NSTI(W) BENGALURU

2. LEARNING OUTCOME OF THIS SESSION THE TRAINEES AT THE END OF THIS SESSION CAN UNDERSTAND THE What is Construction Joints? 2. Types of construction joints. Location of construction joints. Defects of concrete laying.

3. DEFECTS IN CONCRETE LAYING CRACKING CRAZING BLISTERING / SCALING CURLING SPALLING BUCKLING

4. CRACKING Cracking  can occur in both hardened and fresh, or plastic,  concrete  as a result of volume changes and repeated loading. This involves tensile stresses being loaded onto the  concrete , the  cracks  occurring when the force exceeds its maximum tensile strength

5. Crazing  in  concrete  is the development of a network of fine random cracks or fissures on the surface of  concrete  caused by shrinkage of the surface layer. These cracks are rarely more than 3mm deep, and are more noticeable on over floated or steel-troweled surfaces. CRAZING

6. Blistering  occurs when air gets trapped in the  concrete  and can't break out of the seal that may be created during finishing operations or caused by a rapidly setting surface. The air collects in spots under this airtight surface seal and creates  blisters . ... Float the  concrete  twice, if time permits BLISTERING/SCALING

7. CURLING Curling  is the distortion of a slab into a curved shape by upward or downward bending of the edges. The occurrence is primarily due to differences in moisture and/or temperature between the top and bottom sur- faces of a  concrete  slab.

8. Spalling —sometimes incorrectly called " spaulding " or " spalding "—is the result of water entering brick,  concrete , or natural stone. It forces the surface to peel, pop out, or flake off. It's also known as flaking, especially in limestone.  Spalling  happens in  concrete  because of moisture in the  concrete SPALLING

9. BUCKLING The term “ buckling ” is used to describe a stability failure of axially loaded structures, which is characterized by a disproportionate high deformation increase and a sudden failure.

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