The Prevention of Common Concrete problems

There are many problems we'd be facing during and after concreting. to supply top quality concrete we must take some precautions to avoid those common problems during concreting. during this article, we'll discuss common concrete problems and the way to stop them.

Dusting

Dusting are often prevented by taking following precautions.

• Maintain an appropriate water/cement ratio within the concrete.
• Utilize dust free aggregates within the mix.
• Guarantee appropriate hydration of concrete.
• Avoid early surface finishing of concrete.

Scaling

Scaling is that the physical deterioration of concrete during which the surface layer of concrete broke down, pitted or flaked away. thanks to this effect concrete surface becomes worse. Scaling are often prevented by taking same precautions adopted for laitance.

Plastic Shrinkage Cracks

When the evaporation rate of water mixed within the concrete is bigger than the bleed water of concrete, plastic shrinkage cracks are developed on the surface of the concrete. Basically, this sort of cracks occurs in extremely popular climate.

Laitance

The appearance of cement-sand particles on the surface of freshly placed concrete is understood as laitance. it's mainly occurred thanks to the bad effect of bleeding and segregation of concrete.

Following precautions are often taken to prevent the occurrence of laitance in concrete.

• Clay, dust, silt content etc should be removed before mixing the concrete.
• Water-cement ratio should be maintained properly.
• Water shouldn't be sprayed on the concrete surface during finishing work.
• Use well graded fine aggregates within the mix.
• Add little amount of water reducing admixture within the concrete mix.

Bleeding

Bleeding refers to as a bent of water to seem on the highest surface of concrete after finishing. thanks to bleeding some measure of water (with sand particles and other cementing materials) appears at the surface of the concrete.

Following precautions should be taken to scale back bleeding in concrete.

• Design the combination appropriately.
• Include least water content within the mix.
• Use greater amount of cement content.
• Use greater amount of fine particles.
• Utilize a touch measure of air entraining admixture.

Segregation

It's generally seen within the plastic stage of concrete. The following precautions should be adopted to stop segregation in concrete.

• Design the combination appropriately.
• Never use excessive water content.
• lookout of handling, placing, and proper compaction of concrete.
• don't allow the concrete to be dropped from more heights.
• Use air entraining admixture.
• Keep the formwork to be watertight.