ABOUT CONCRETE

Knowing what goes into your concrete job is important, that way you know EXACTLY what's going on.

How Much Concrete Do You Need?

Understanding how to calculate concrete helps you plan your project, estimate costs, and avoid running short on materials. While this calculation gives you a general idea, factors like site conditions, reinforcement, and waste allowance can affect the final amount needed.


For precise measurements and expert recommendations, contact us and we’ll ensure you get the right amount for a strong, long-lasting project. 


Figuring out how much concrete you need is simple with this formula:

📏 Length (ft) × Width (ft) × Thickness (in) ÷ 12  = Cubic Feet
📐 Cubic Feet ÷ 27 = Cubic Yards (since concrete is sold by the yard)


Example Calculation:

If you're pouring a 10 ft x 10 ft slab at 4 inches thick:
✔ 10 × 10 × 4 ÷ 12 = 33.3 cubic feet
✔ 33.3 ÷ 27 = 1.23 cubic yards of concrete needed


For large or complex projects, it’s best to order extra concrete (about 5-10% more) to account for spillage or variations in depth.


CLICK HERE to use the calculator

Concrete Strength & Mix Types

Concrete is more than just a mix of cement, sand, and gravel—it’s a science. The strength and durability of concrete depend on its mix design, reinforcement, and curing process.


Concrete Strength

Concrete strength is measured in PSI (pounds per square inch), which determines how much pressure the cured concrete can withstand before failing. The most common strengths include:


  • 3,000 PSI – Standard residential applications (sidewalks, patios)
  • 4,000 PSI – Driveways, foundations, and footings (better resistance to weather and wear)
  • 5,000+ PSI – Commercial applications, heavy-duty loads, and high-performance projects


Mix Percentages

The percentage in a concrete mix typically refers to the cement content in the overall mix or the air entrainment percentage.


  • 2% Mix – A lower cement content, making it more economical but less durable. Used for basic, non-load-bearing applications like sidewalks.
  • 3% Mix – A balanced mix commonly used in residential driveways and patios where moderate strength is needed.
  • 4% Mix – A higher cement content, providing increased strength and durability. Ideal for foundations, high-traffic areas, and commercial applications.


The right mix depends on the project—for example, a driveway in Colorado needs higher strength (4,000+ PSI) due to freeze-thaw cycles and the weight of vehicles.

Rebar Strength

Rebar adds tensile strength to concrete, preventing cracks and structural failures. Without reinforcement, concrete can crack and break under tension.


Types of Rebar & Strength Ratings

Rebar comes in different thicknesses and strength grades.


  • #3 Rebar (3/8”) – Used for light-duty work like sidewalks and small patios.
  • #4 Rebar (1/2”) – Common for driveways, patios, and footings to provide extra reinforcement.
  • #5 Rebar (5/8”) – Ideal for residential foundations, heavier loads, and retaining walls.
  • #6+ Rebar (3/4” and up) – Used in commercial and heavy structural work where extra strength is needed.


Rebar Strength Ratings

  • Grade 40 (40,000 PSI) – Standard strength for residential applications.
  • Grade 60 (60,000 PSI) – The most commonly used rebar for driveways, footings, and foundations.
  • Grade 75+ (75,000 PSI and up) – Used in high-strength concrete structures like bridges and commercial buildings.


Using the right rebar size and grade prevents cracking, increases durability, and ensures long-term stability for your concrete project.

Concrete Curing Process

Curing is one of the most critical steps in ensuring concrete reaches its full strength and durability. Many people don’t realize that concrete doesn’t dry, it cures, which is a chemical reaction that continues for weeks after it’s poured.


Curing Time & Strength Development

  • 24-48 Hours – Initial setting period; no heavy traffic.
  • 7 Days – Reaches about 50-60% of its final strength (light traffic is okay).
  • 28 Days – Fully cured, achieving 100% of its designed strength.


If concrete isn’t properly cured, it can lose up to 50% of its strength, making it more prone to cracking and surface defects.


Best Curing Practices to Ensure Strength & Longevity

  • Water Curing – Keeping the surface wet for at least 7 days prevents it from drying too fast and cracking.
  • Curing Compounds – Liquid sealers that retain moisture and speed up hydration.
  • Covering with Plastic or Burlap – Helps retain moisture, especially in hot or dry climates.


Proper curing ensures maximum strength, durability, and a longer-lasting surface—something we at 3C Construction always prioritize for our clients.


Why Choose Us?

We proudly serve residential and commercial properties across Northeastern Colorado with a wide range of specialized services. Our skilled and experienced crew delivers top-quality work.


Quality Materials:  We use only the best materials for every project to ensure strength and durability.


Experienced Team: Our skilled team has years of experience, guaranteeing precision and professionalism on every job.


Customized Solutions: Whether it's a simple walkway or a custom stamped design, we offer custom services to meet your specific needs.


On-Time and On-Budget: We understand the importance of deadlines and budget constraints. You can trust us to complete your project efficiently without sacrificing quality.


No matter the project, we tailor our services to your specific needs. Experience the best in strength, durability, and aesthetics—all in one place with 3C Construction.