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You must have seen the poorly appeared structure surface with exposed reinforcement or aggregates, it is known as Honeycombing of Concrete. Do you know what exactly Honeycombing of Concrete is, why it happened, how to prevent it to happen and how to repair it?
Please read this blog for details
In simple terms, cement concrete is a mix of adhesive (cement) and small grits or aggregates. The adhesive is made from a mix of cement and water in the desired ratio. When added together (cement, water and aggregate), a chemical rejoinder takes place and it hydrates the mix and gradually the mix begins to harden.
Once settles, it increases its strength and becomes a solid mass concrete. The durability and strength of cement concrete is the key driver to consider it as indispensable material for all types of structures such as bridges, buildings, highways, railways, etc.
When cement concrete is dispensed into the structure casing or formwork, the mix flows like a very concentrated liquid. In an ideal situation, it should gradually flow in all directions within the casing or formwork, but sometimes it doesn’t happen. When it doesn’t happen means, when the mix doesn’t reach all the places within the formwork, it creates voids.
Once the concrete settles and formwork is removed, it appears like a nest of the honeybee and as a result, the structure loses its full expected strength.
After removing the Formwork, when the settled concrete surface displays small pockets of air void and or exposed aggregate without mortar (cement mix), it is called honeycombing of concrete. Honeycombing could be present on the top surface or it could be present deep inside.
As a result, it significantly impacts the strength of the structure. Honeycombing of concrete also allows seepage of water through it and as a result, the steel reinforcement begins to corrode, which is a serious risk to the integrity of the structure.
As the name suggests, Jet grouting means grouting with a high-pressure jet. The jet pressure removes the unwanted material first and then applies grout to the surface.
Fracture grouting uses a low viscosity cement grout and injects it under high pressure. In this grouting method, the concrete mix and the chemical mix is injected through hydraulic pressure. Grout is pushed down the casing or formwork and spread over the fractured area.
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