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All concrete will eventually sink over time whether it is a small sidewalk panel or a large industrial slab. There are many reasons why your concrete can sink and even develop cracks. Here are some of the reasons why your concrete can sink:

Poor or improper contraction of the base before concrete was poured: The weight of the slab will further compact the base after curing, and settlement can happen quickly.

Erosion: Damaged water,sewer lines and irrigation lines, improperly placed downspouts and excessive rain can all lead to a washout of the base materials under concrete causing the slabs to settle.

Machine/Traffic Vibrations: Concrete slabs may shift, sink or settle on highways or in industrial settings where there is frequent heavy vibrations or loads being transported. The vibrations from machinery and passing traffic can lead to the base compacting and slabs settling or moving.

Slab curl, Rocking slabs: Slab curl occurs when a relatively large section of concrete is poured. During the curing process the top of the slab may cure slightly faster causing the slab to curl, rock, and become unstable. Vibration can also cause slabs to settle

Climate: Heat and drought can cause expansive clay soils to shrink, causing slabs to settle. When the clay soils receive rain, and expand once again, the concrete slabs shift and become uneven.

Tree roots: can pull moisture from under your slabs and cause cracking and settling, they can even push up on your slabs and damage them!

Poor workmanship: Lack of rebar, concrete without the proper PSI strength test rating, unnecessarily large sections, and improper soil grading and compaction before pouring are all reasons your slabs can settle.