How to reduce cracks in Reinforced Concrete Structures
Cracks occur in various components of reinforced buildings because of diverse reasons. Therefore, proper measures should be taken to alleviate cracks as well as increase the longevity of the building.
This construction article sheds light on some vital methods to reduce cracks in the reinforced buildings :-
Criterions to reduce Cracks in Reinforced Concrete Structures :-
? Planning the layout of restraining members
? Structural separation
? Closure strips, joints, and favorable pouring sequences
? Released connections; Wall/ slab release, slab-column release, wall joints,
? Inclusion of better layout of mild reinforcement
? Inclusion of better layout of tendons
Planning the Layout of Restraining Members: While developing architectural planning, it is essential to choose proper position for columns and walls to prevent restraint-cracks. Equivalent number of walls containing the similar length, should be arranged to reduce the scope for producing cracks as there is scope for the slab to switch freely in the direction of planned point of zero movement.
In order to avoid initial cracks, the walls and layouts should be placed in such a manner so that it does not block the free movement of walls.
Structural Separation to alleviate cracks in Reinforced Concrete Structures - The cracking occurs specifically for the Slabs which contain asymmetrical geometry. As for instance, a structural separation among larger post-tensioned rectangular slab and smaller square slab. The width of structural separation generally varies from 13 to 26 mm.
The variation among expansion joint and structural separation occurs due to the fact that the function of the later is for restricted time ranging from two or three months, while the previous, for which its task is to organize rooms for temperature created movements, should work and carries on its function for the whole life span of the structure.
Closure Strips, Joints and Favorable Pouring Sequences
A closure strip stands for a temporary space among two regions of a slab which are built up and post tensioned in a different way. These two-disjointed post tensioned slab parts are allowed to experience shortening without depending to each other.
The width of the closure strips is dependent on the distance required to set up stressing jack among two slabs, and is generally among 76- 91 cm.
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