How to Best Cure Concrete in High Winds in Southern California?

The best way to cure concrete in high winds is to implement strategies that prevent rapid moisture loss from the slab surface, such as erecting physical windbreaks, applying liquid membrane-forming curing compounds, and employing wet curing methods where practical.

To cure concrete in high winds, use physical windbreaks, apply liquid curing compounds, or employ wet curing methods to prevent rapid moisture loss and ensure the concrete achieves its full strength.

High winds present a significant challenge when curing newly poured concrete by accelerating surface evaporation, which can compromise the final strength and durability of the slab. Concrete, which contains 15-20% water by weight, requires this moisture for the cement to fully hydrate and gain its intended strength, durability and resilience (F38, F20, F21). Without adequate moisture retention, the surface can dry prematurely, leading to plastic shrinkage cracking and a weaker, less durable finish. This is especially critical in arid and windy regions like many parts of Southern California.

Essential Wind Curing Strategies

Effective wind curing focuses on two primary objectives: reducing direct wind exposure and maintaining surface moisture. Addressing these simultaneously ensures a more robust and long-lasting concrete installation.

1. Erecting Windbreaks

Physical barriers are a primary defense against wind. Tarps, plywood, or other temporary sheeting can be strategically placed around the perimeter of the pour to deflect wind currents away from the newly placed concrete. These windbreaks should not touch the concrete surface and must be securely anchored to prevent them from blowing over or into the pour. While such construction techniques historically have been limited to specific areas like basements, they are increasingly important for all types of concrete installations, from driveways to patios (F31).

2. Applying Curing Compounds

Liquid membrane-forming curing compounds are sprayed onto the surface of fresh concrete. These compounds create a thin, impermeable film that traps the internal moisture, preventing it from evaporating too quickly, especially under windy conditions. It's crucial to apply these compounds evenly and at the manufacturer's recommended coverage rate. Always follow the manufacturer's instructions for application to achieve the best results (F6).

3. Wet Curing Methods

For some applications, wet curing methods like ponding, continuous sprinkling, or covering with wet burlap are effective, although they can be more challenging to maintain in high winds. If using wet burlap, ensure it remains consistently saturated and is weighted down to prevent it from being displaced by wind. Continuous sprinkling requires vigilant monitoring to ensure the surface does not dry out between applications, which can cause hydration issues rather than solve them.

4. Fogging or Misting

In milder wind conditions, periodic fogging or misting with fine water spray can help maintain high humidity directly above the concrete surface, slowing down evaporation. Care must be taken not to apply too much water, which could distress the surface or alter the concrete's water-cement ratio.

Why Proper Curing Matters

Proper curing is fundamental to realizing concrete's inherent benefits of strength and durability (F19, F20). Concrete is a material known for its compressive strength, ranging from economic low-strength masonry to ultra-high performance applications (F28, F29). Without adequate curing, particularly in challenging conditions like high winds, the concrete will not achieve its designed strength, potentially leading to surface dusting, scaling, and reduced wear resistance. This is important for all concrete structures, whether for residential use or larger projects like road construction, where concrete is recognized as the best material for durability and longevity compared to asphalt (F9, F16).

When planning a concrete project in Southern California, especially in areas prone to seasonal high winds, assess the potential for wind exposure and incorporate appropriate curing measures into your project timeline and budget. Western Concrete recommends discussing specific site conditions with your contractor to ensure the most effective curing strategy for your project.