Cracks and Repairs in buildings

Cracks and Repairs
R.C.C. Structures

Cracks in building::

•Structural cracks

–due to incorrect design

–faulty construction

–Overloading

•Non Structural cracks

–Moisture changes

–Thermal movement

–Elastic deformation

–Creep

–Chemical reaction

–Foundation movement and settlement of soil

–Vegetation

Prevention of Thermal Cracks

To prevent thermal cracks expansion joints, control joints and joints in case of change of shape and direction of wing in a structure are to be provided

General measures for avoidance reduction of cracks due to elastic strain, creep and shrinkage

•Water cement ratio is to be controlled.

•Reasonable pace of construction adopted.

•Brick work over load bearing RCC members should be done after removal of shutting giving a time gap.

•Brick walls between columns should be deferred as much as possible.

•Plastering of areas having RCC and brick members should be done after sufficient time gap say one month or suitable groves provided in junction.