Concrete is one of the most durable and widely used construction materials. However, despite its resilience, cracks can still form, leading to aesthetic, structural, and functional issues causing the need for street and sidewalk repairs. Understanding the root causes of these cracks is crucial in preventing and ensuring the longevity of your concrete structures. In this post, we’ll explore three common reasons why concrete cracks: shrinkage, too-rapid drying, and improper curing.
1. Shrinkage
Shrinkage is a natural phenomenon that occurs as concrete dries and hardens. As the mixture loses excess moisture, the concrete reduces in volume, leading to potential cracking. This risk can be mitigated by using control joints that direct where the cracks should happen, allowing for a more predictable pattern and reducing unsightly jagged lines across the surface. This reduces the need for street and sidewalk repairs.
2. Too-Rapid Drying
Rapid drying is another significant cause of cracks in concrete. When concrete dries too quickly, usually due to environmental factors such as high temperatures or wind, it can lead to uneven drying and surface cracking. This problem underscores the importance of a controlled curing process. According to experts, slabs on the ground, like pavements and driveways, and structural concrete, such as bridge decks and columns, require a minimum curing period of seven days when ambient temperatures exceed 40 degrees Fahrenheit, to prevent such premature drying and ensuing cracking.
3. Improper Curing
Curing concrete properly is essential for achieving maximum strength and durability. Inadequate curing can result in reduced structural performance and increased susceptibility to cracking. A common mistake is removing forms or allowing traffic prematurely on newly poured concrete. Ensuring an adequate curing period, particularly during adverse weather conditions, significantly reduces the likelihood of cracks, as it allows the concrete to develop its intrinsic properties fully.
Cracks in concrete can undermine not just the appearance but also the functionality and safety of a structure. Addressing the common causes such as shrinkage, too-rapid drying, and improper curing is essential for preventing these issues. By understanding and implementing effective control measures, construction professionals and DIY enthusiasts alike can ensure that their concrete projects are both resilient and long-lasting. For more information on street and sidewalk repairs or other concrete projects, call GFP Mobile Mix today!