Why Does Concrete Sink?

What happened there?

Concrete weighs about 150 lbs per cubic foot. The substantial weight of both the concrete itself, as well as the significant loads that concrete is designed to support, require the soil beneath to have sufficient load-bearing capacity. Often the soil is improperly graded during the excavation process and is ineffective in holding the weight of concrete in place, concrete begins to sink and buckle as a result.

In addition to poorly compacted soil, inadequate water draining systems are a leading cause for sinking concrete in Utah. If the adjacent grade to the concrete slab is too low, it can cause the water to flow from the high area to the lower area taking the soil beneath the concrete slab with it.

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