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Causes of Concrete Cracks: Why Does It Happen?

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Concrete, with its durability and versatility, serves as the backbone of many construction projects. Yet, one of the most common dilemmas faced by contractors and homeowners alike is the appearance of cracks in freshly poured concrete. While cracks may initially seem concerning, it’s essential to recognize that they are often a natural occurrence in concrete structures. In this article, we delve into the various factors that contribute to concrete cracking and explore the different types of cracks that may emerge.

The American Concrete Institute, a leading authority in the field, emphasizes the inevitability of cracks in concrete structures, stating that it is unrealistic to expect entirely crack-free floors. This acknowledgment underscores the importance of understanding the root causes of concrete cracks rather than viewing them solely as indicators of poor workmanship.

Concrete Cracks on Surface


Types of Concrete Cracks and What They Mean


Plastic Shrinkage Cracks:


One of the primary culprits behind concrete cracks is plastic shrinkage. During the initial curing process, water within the concrete mixture evaporates, leading to the formation of voids between solid particles. These voids weaken the concrete, making it susceptible to cracking. Plastic shrinkage cracks, characterized by their fine, often spider-web-like appearance, are a common occurrence in freshly poured concrete.


Improper Jointing:


Inadequate jointing during the construction process can also contribute to concrete cracking. Joints serve as intentional points of relief, allowing the concrete to expand and contract without causing structural damage. Failure to incorporate proper jointing techniques can result in uncontrolled cracking as the concrete responds to temperature changes and moisture fluctuations.


Continuous External Restraint:


Concrete subjected to continuous external restraint may experience cracking due to restricted movement. External factors such as adjacent structures or improperly designed reinforcement can impose constraints on the concrete, leading to stress build-up and eventual cracking.


Lack of Isolation Joint:


The absence of isolation joints, which separate different sections of concrete, can exacerbate cracking by preventing localized movement. Isolation joints serve as buffers against the transmission of stress between adjacent concrete elements, thereby minimizing the risk of crack formation.


Freezing and Thawing:


In colder climates, concrete is particularly vulnerable to cracking as a result of freezing and thawing cycles. The expansion of water within the concrete pores during freezing can exert significant pressure, leading to cracks and deterioration over time.


Craze Cracks:


Craze cracks, characterized by a network of fine surface cracks resembling a spider’s web, often stem from improper curing methods or environmental conditions during concrete placement. These cracks, also known as map-cracking or alligator cracking, compromise the aesthetic appeal of the concrete surface while posing minimal structural concerns.


Settlement Cracks:


Settlement cracks occur when the underlying soil beneath the concrete slab fails to adequately support the load, resulting in uneven settling and subsequent cracking. These cracks, which may widen over time, necessitate prompt attention to prevent further damage to the structure.


How to Prevent Concrete Cracks


Prevention is often the most effective strategy for mitigating concrete cracks. By implementing proactive measures during the design, construction, and maintenance phases, stakeholders can significantly reduce the likelihood of crack formation. Adequate reinforcement, proper jointing, and thoughtful placement techniques are essential components of a comprehensive crack prevention strategy. Employing high-quality concrete mixtures with optimal water-cement ratios and incorporating supplementary materials such as fibers or admixtures can enhance the durability and resilience of concrete structures. Additionally, diligent attention to environmental factors, such as temperature and moisture fluctuations, can help minimize the risk of cracking over time. By prioritizing preventive measures and adhering to best practices, stakeholders can optimize the longevity and performance of concrete structures while minimizing the need for costly repairs.


When to Call a Professional


Concrete company fixing concrete cracks


While minor cracks may be addressed through DIY repair methods, certain situations warrant the expertise of a professional concrete contractor. Signs of structural compromise, such as wide or deep cracks, uneven settlement, or significant deterioration, should prompt immediate attention from qualified professionals. Additionally, if cracks reappear despite previous repair attempts or if the underlying causes remain unresolved, it may indicate more extensive issues that require professional assessment and remediation. Professional contractors possess the technical expertise, specialized equipment, and industry experience necessary to accurately diagnose the root causes of concrete cracks and implement targeted solutions. By entrusting concrete crack evaluation and repair to knowledgeable professionals, stakeholders can ensure the integrity and safety of their structures while minimizing the risk of future damage and costly repairs.




While the presence of cracks in concrete can be disconcerting, it is essential to recognize that they are often an inherent characteristic of concrete construction. By understanding the various factors contributing to concrete cracking, stakeholders can take proactive measures to minimize the risk of cracks and mitigate their impact on structural integrity. In instances where cracks do emerge, prompt evaluation and appropriate remediation measures can help preserve the longevity and performance of concrete structures.

At Cesars Concrete, we are committed to providing comprehensive concrete solutions tailored to the unique needs of our clients. Whether you require assistance with crack assessment, repair, or new concrete installation, our team stands ready to deliver superior craftsmanship and unparalleled customer service.

We proudly serve the entire Northern Colorado area, offering a wide range of commercial and residential concrete services. Trust Cesars Concrete to bring your concrete visions to life with precision, professionalism, and integrity. Contact us at (970) 420-9040 or check out our portfolio to get started.

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