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Flowable Fill: The Basics

April 18, 2017

To the untrained eye, all concrete and concrete-related products all seem the same. After all, how much different can one gray slab be to the next? However, there are different products that are best used for certain applications, such as flowable fill. This product may look like concrete, but it doesn’t act the same way—and it’s not even technically considered concrete. Learn more about this unique product below.

What is flowable fill?

Flowable fill is a self-compacting low-strength material that is placed as a liquid. The slump is usually greater than 8 inches, and the self-leveling material can be placed with minimal effort, as it does not require tamping or vibration.

Why is flowable fill used?

Flowable fill is great for fixing problems that originate from poorly compacted soil or granular fill. For instance, flowable fill is typically used as backfill for sewer trenches and pile excavations or structural fill for foundation subbase and pavement bases.

This economical alternative offers considerable savings in labor costs, time, and equipment. It’s even great for filling inaccessible areas, such as underground tanks, and it provides a safer alternative as workers don’t have to be in holes to complete a job.

How is it delivered?

Flowable fill is delivered by a ready mix concrete truck and is placed via chute in its flowable condition directly into the area that needs to be filled. This unique material can be conveyed by pump, chute or bucket, and thanks to its fluid properties, it can flow long distances.

What else should I know about flowable fill?

Flowable fill is not concrete, which means it doesn’t need to be cured like concrete. However, this product should be protected from freezing until it has fully hardened, so be sure to take this into consideration if using on your project.

Ozinga recommends flowable fill for a variety of projects. If you are interested in our flowable fill, contact one of our concrete specialists today.

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