5 Reasons Why Newly Poured Concrete Cracks



We are frequently questioned about the reasons why concrete cracks. Customers are perplexed as to why they can appear in a freshly built foundation. A homeowner will ask why it is fracturing and whether they obtained subpar products or craftsmanship.

Concrete is among the most resilient and long-lasting materials you can utilise around your home when placed properly. However, it is crucial that concrete installers adhere to accepted standards for laying concrete. Concrete that is resilient, strong, and crack-resistant does not appear by chance.

Simple settling cracks are common. Even while once-cured concrete is quite resilient, it’s rare to discover a basement without at least one fracture. Some reasons may be – 

  • Excessive water used in the mixture – 

Although residential pours frequently contain too much water poured into the concrete on the project site, concrete doesn’t need much water to reach its optimum strength. To make the concrete simpler, this water is injected. However, this extra water will significantly weaken the concrete’s strength.

Cracking is frequently caused by shrinkage. Concrete shrinks as it dries and hardens. It’s because some of the water used in the mixing process evaporated. The greater the moisture content of the concrete, the greater the shrinkage. Half an inch per 100 feet is the maximum allowable shrinkage for concrete slabs. Consequences of this shrinkage include forces that rip the slab apart. Stresses like these might cause cracks to form over time.

  • The concrete dried up too fast – 

Additionally, the likelihood of cracking will dramatically rise if the slab dries out too quickly. Water is necessary for the chemical reaction that transforms concrete from a liquid or plastic state (or a solid state). After you install the concrete, this hydration—or chemical reaction—keeps going for days or weeks.

  • Concrete purged on the job with incorrect strength – 

Concrete comes in many strengths. Check the recommended strength for the cement you are pouring. Speak with the concrete contractor. If you hire a professional good, quality concrete contractor, the chances of concrete making cracks, for this reason, may lower. However, a concrete contractor should know what products are being used and if the process is done correctly. 

  • Less number of control joints in the concrete slab – 

Control joints help cement fracture where you want it to on a concrete slab. The joints must not exceed the concrete’s thickness 2-3 times (in feet) and should match the slab’s depth (in inches). Therefore, joints in 4′′ concrete should be 8–12′ apart.

  • Foundations made in Winters –

The number of cracks in foundations that are built during the winter or that are poured but not heated will increase significantly. Inevitably, foundations placed on the inadequately compacted base material (ground) will also experience an increase in cracking. Your soil conditions must be taken into account when preparing the subgrade. You can directly pour some flatwork upon the original grade. A slab must have steel rebar installed, and 6″ of base fill in other places.

You will receive quality concrete work if you know what your concrete contractor is doing on each of the aforementioned factors.


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