You must have heard that modern structures derive their strength and longevity from concrete. However, if your concrete mix is subpar or it is not placed right, it can create further problems for the structure.

For instance, after the removal of the formwork during construction, you may notice cavities, voids or minute gaps in the finished concrete structure. The texture resembles a honeybee’s nest. This phenomenon is commonly referred to as honeycombing in concrete.

The formation of honeycomb in concrete is a matter of concern. It can deeply weaken the structure, deteriorate its surface appeal and make it vulnerable to environmental attacks. Honeycombing can significantly reduce the lifespan of concrete structures.

If you wish to undertake durable construction, you must know the causes of honeycomb in concrete and the techniques for preventing the same. Read on to discover your complete guide on the subject.

What Leads To Honeycombing In Concrete?

Starting from the cement you choose to the concrete placement method – here are the most common mistakes that lead to honeycombing in concrete.

Inefficient Formwork

During construction, the wet concrete is initially placed within a temporary mold or holder called formwork. Its purpose is to hold the concrete in place until it hardens properly and attains a firm, stable shape.

When the formwork is not sealed or tightened adequately or when it is removed prematurely, the concrete may leak out. This leads to the formation of honeycomb in concrete.

Poor Compaction

When the concrete is freshly placed, it may have some air bubbles trapped inside it, which later get reflected as the honeycomb in the finished concrete.

The compaction of concrete involves immersing a vibrator in the concrete mix, so as to remove the trapped air voids with the vibrations. When this process is neglected or not conducted sufficiently, honeycombing occurs, reducing the strength of the finished concrete structure.

 

Incorrect Water Content

If the water content of the concrete mix is too much or too less, its cohesion gets hampered. Excessive water content can make the heavier aggregates sink to the bottom of the mix, thus affecting uniformity. Such concrete is prone to honeycomb formation, once the formwork is removed.

Insufficient water content, on the other hand, reduces the workability and fluidity of the concrete. When the thick concrete fails to flow around properly, cavities are likely to form.

 

Inaccurate Placement Of Concrete

There are several mistakes that builders make while placing the concrete. One is, pouring the concrete from a great height. Doing so can hamper the workability of concrete, thus making it more prone to honeycombing.

Furthermore, when reinforcement bars are placed too closely during the placement of concrete, they prevent it from flowing easily. This leads to irregularities in the settling down of concrete within the formwork, which ultimately results in honeycombing.

 

 

 

How To Fix Honeycomb In Concrete The Smart Way?

Once formed, fixing honeycomb in concrete gets difficult. But here’s what you can try. First, gently brush and clean the affected part to remove dirt and all the loose particles. Once this is done, install a reliable, water-tight formwork and then apply high-strength grout to fill the gaps in the finished concrete.

Grout is a dense mix of water, cement and sand. It is quite efficient at sealing gaps or voids, when prepared with the best cement in India like MP Birla Cement Perfect Plus.

However, you should primarily opt for taking the right measures during the preparation and placement of concrete. This way you can avoid the formation of the honeycomb in the first place. So here is what you should do without fail:

 

• It is important to ensure that your concrete mix is composed of fine and uniform aggregates. The presence of uneven aggregates leads to irregular placing of the concrete whose consequence is honeycombing.
• Your concrete mix should have excellent workability. Concrete with high workability can be placed and compacted with ease. This factor highly depends upon the type of cement you use in your concrete mix. We will discuss the role of cement in a little more detail later.
• Concrete should not be poured from a height more than 1.5 metres to make it flow and settle within the formwork easily.
• The formwork should be watertight, properly sealed and selected as per the nature of your project for best results. For high-rise construction, steel formwork is the best. Whereas, when you are undertaking a small-scale project, you can opt for timber or plastic formwork.
• Concrete needs to be compacted properly to avoid air voids. The vibrator should be used for as long as 5-15 seconds until you stop seeing the air bubbles emerging up. It is then important to withdraw the vibrator slowly so that the concrete can fill in the space created by the vibrator.
• Make sure to cure the concrete sufficiently so that it can acquire its full strength and does not develop cavities or cracks. Water curing and membrane curing are some of the most effective curing methods you can opt for.

 

Apart from adopting these practices, there’s another non-negotiable step that you must take – choosing the best cement in India for preparing the perfect concrete mix.

 

Choose The Best Cement For Concrete

Cement forms a core part of concrete. It determines the density, consistency and workability of concrete. To prevent honeycombing, we highly recommend manufacturing concrete with our Concrete Special Cement – MP Birla Cement Perfect Plus. Here’s why:

• Its ultra-fine particles form a dense concrete matrix with high uniformity. It hence becomes easier to place the concrete without the formation of voids.
• It has an optimum water demand which improves workability, reduces voids and enhances concrete strength.
• Its high early strength boosts the hardening rate of concrete. This way, the formwork can be removed earlier with reduced chances of honeycombing.
• It reduces the permeability of concrete to water and chemical attacks and strengthens it further.

With the right cement and the right techniques, you can easily avoid honeycomb in concrete and build structures that last for ages.

 

FAQs

Q.What is the reason behind honeycombing in concrete?

Honeycombing in concrete can occur due to many reasons. It can result from the use of low-grade concrete and also from mistakes made during the construction process. Lack of care during compaction, curing and installation of formwork are some of these common errors.

 

Q.Can honeycomb in concrete be prevented?

Yes definitely. To prevent honeycomb in concrete, you should prepare it with the best cement in India for high workability and strength. Use of proper formwork and compaction are also essential to prevent honeycomb formation.

 

Q. How can you fix honeycomb in concrete?

For fixing honeycomb in concrete, you can remove all loose and weak particles from the concrete surface with a gentle brushing and cleansing process. This should be followed by the application of grout prepared with cement like MP Birla Cement Perfect Plus to fill the cavities in the concrete.