Subsurface voids are gaps or holes in or beneath concrete slabs. They are a major source of concern for engineers and property owners since they can cause structural failures or serious risks.

Typically, such voids are mostly found on roadways, pavements, bridges, and concrete slabs (such as floors or walls).

But tracking the location of these concrete voids and fixing issues is critical for assuring the concrete structure's safety. Such voids are mainly visible on sidewalks and walkways, you can consult Concrete Sidewalk Repair in NYC or NYC sidewalk repair for professional assistance.

How Do These Voids Occur?

The formation of voids can occur due to numerous circumstances. But here's the most common cause, which includes leaking or broken utilities, faulty concrete construction, poor subgrade compaction, or poor subgrade drainage.

The aforementioned factors cause concrete deterioration and the establishment of weak spots. These regions eventually become voids and grow in size until their weight carrying ability is compromised and they give way.

When a large void forms, the danger is unavoidable. The weight of the concrete is supported only by thin air. Eventually, the weight of cars, whether they are moving or parked, will weaken and crack the concrete slabs.

Here are Tips to Smooth Concrete Surface :

It is feasible to fill those surface voids to provide a smooth concrete surface finish, but this is expensive, and we believe it is preferable to avoid this problem. We want to help you with this, so we've compiled a list of ideas to help you create a smooth concrete surface.

Because numerous variables influence the surface finish, keep in mind that the following solutions may not eliminate surface voids. These tips will assist you to avoid and repair the concrete voids.

1. Surface gaps such as pinholes and air bubbles are created when air is trapped during the concrete curing process. Also, to ensure the accurate viscosity for the application, certain changes to the concrete mix design are required. The required mix viscosity is directly proportional to the type of mold/product/compaction being used.

2. Increase the amount of time spent mixing the concrete. When the mixing time is increased, air and water separate. As a result, the consistency of the concrete mix will improve.

3. Concrete vibration affects the elimination of surface voids. Here's how it works, as vibration transfers remaining water and air to the surface of the concrete by shaking it either inside or outside of the mold.

4. In your concrete mix, choose aggregate that is free of uneven bits. When the aggregate is more homogeneous, the concrete becomes more fluid, reducing the possibility of water and air becoming trapped.

5. Use the proper positioning strategy. Slowing down the placement procedure can sometimes prevent additional air from being trapped in the concrete while the formwork is filled.

Some formations, like columns, may be better filled by pumping from below or using a tremie pipe. Filling a form too quickly might cause the concrete to separate, resulting in larger surface voids.

6. When removing the concrete from the molds, use the proper release agent. Otherwise, puddling will occur if this is not done correctly. These puddles can retain air and water, preventing the vibration process from removing them.

The release agent must be applied with precision and as thinly as possible. A thinner release agent layer will usually ensure that air can quickly migrate down the formwork to the concrete's surface. Thicker oils can cause air to become trapped against the concrete surface and formwork, resulting in surface voids. You can also hire professionals from Concrete Sidewalk Repair in NYC or NYC sidewalk repair for assistance.

Author's Bio: 

This article is written by the author of Chiranjit Roy. With her years of experience and expertise in the niche of sidewalk repair and, concrete sidewalk repair in NYC or NYC Sidewalk repair, you can get in-depth information about the concrete voids and tips to avoid it.