How to replace a section of concrete driveway

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Introduction

Concrete driveways are known for their durability, but even the strongest surfaces can develop cracks, crumbling sections, or sunken areas over time. Sometimes, spot repairs like crack filling or patching aren’t enough—replacing a damaged section of concrete is the best solution.

Frustrated with unsightly cracks or broken slabs making your driveway unsafe? This guide will show you exactly how to replace a section of concrete driveway step by step, saving money compared to full replacement while restoring a smooth, strong surface.

Why Section Replacement Matters for Your Driveway

Instead of replacing the entire driveway, fixing one section offers multiple benefits:

  • Cost savings: Repairing one slab is far cheaper than replacing the whole driveway.
  • Improved safety: Eliminates trip hazards and prevents further cracking.
  • Better appearance: Restores uniformity and curb appeal.
  • Prevents spreading damage: Stops cracks and erosion from affecting nearby sections.
  • Extends lifespan: Keeps your driveway functional for years without full reconstruction.

Just like sealing or joint repair protects against deterioration, replacing damaged sections ensures long-term durability.

Step-by-Step Guide to Replacing a Section of Concrete Driveway

1. Assess the Damage

Before starting, make sure replacement is necessary.

  • If cracks are small, patching or resurfacing may be enough.
  • If a slab is sinking, crumbling, or severely cracked, replacement is the best choice.
  • Mark the section to be removed with chalk.

Pro Tip: Replace whole slab sections rather than partial cuts for a cleaner look.

2. Gather Tools and Materials

You’ll need:

  • Safety gear (gloves, goggles, dust mask, steel-toe boots)
  • Chalk line or spray paint
  • Circular saw with diamond blade or concrete saw
  • Sledgehammer or jackhammer
  • Pry bar
  • Shovel and wheelbarrow
  • Gravel base material
  • Reinforcement (rebar or wire mesh)
  • Concrete mix (ready-mix or bagged)
  • Trowel, float, and screed board
  • Curing compound or plastic sheeting

3. Cut the Damaged Section

Cutting ensures clean edges.

  • Score around the damaged slab with a concrete saw.
  • Cut at least 4 inches deep to match typical driveway thickness.
  • Follow your chalk line for straight, even cuts.

Safety Note: Wear a mask—cutting concrete creates dust particles that are harmful to inhale.

4. Break and Remove Old Concrete

After cutting, break up the section.

  • Use a sledgehammer for small slabs or a jackhammer for larger ones.
  • Pry up broken pieces with a bar and load into a wheelbarrow.
  • Dispose of debris at a local concrete recycling center.

Tip: Break concrete into small chunks—it’s easier to remove.

5. Prepare the Base

A strong foundation prevents future settling.

  • Remove old gravel or dirt down to about 6–8 inches deep.
  • Compact the soil with a hand tamper or plate compactor.
  • Spread 3–4 inches of new gravel and compact again.

Pro Tip: Ensure the base slopes slightly away from your house for proper drainage.

6. Install Reinforcement

Reinforcement strengthens the slab.

  • Place rebar or wire mesh inside the form area.
  • Support it with small blocks so it sits in the middle of the slab.
  • Overlap rebar with existing reinforcement if possible.

7. Mix and Pour the Concrete

Now it’s time to pour the new section.

  • Mix concrete according to manufacturer instructions.
  • Pour evenly into the prepared area, slightly overfilling.
  • Use a screed board to level with adjacent slabs.

Tip: Work quickly—concrete begins setting within 30 minutes.

8. Smooth and Finish

A proper finish ensures strength and appearance.

  • Use a bull float to smooth the surface.
  • Create control joints with a groover every 3–4 feet.
  • Add texture with a broom finish to prevent slipperiness.

9. Cure the Concrete

Curing is essential for strength.

  • Cover with plastic sheeting or apply curing compound.
  • Keep surface moist for at least 7 days.
  • Avoid driving on the new slab for at least 7–10 days.

Pro Tip: Full strength is usually achieved after 28 days.

Common Mistakes to Avoid

  1. Skipping base preparation: Weak soil causes sinking.
    Solution: Always compact soil and add gravel.
  2. Pouring without reinforcement: Leads to early cracking.
    Solution: Use rebar or mesh for durability.
  3. Not matching slab thickness: A thin section cracks quickly.
    Solution: Match existing driveway thickness (typically 4–6 inches).
  4. Skipping curing: Concrete that dries too fast loses strength.
    Solution: Keep it moist and covered during curing.
  5. Uneven finishing: Leaves noticeable lines or slopes.
    Solution: Screed carefully and match adjacent slabs.

Extra Driveway Tips & Hacks

  • Prevent color mismatch: Use the same type of concrete mix as the rest of the driveway.
  • Edge sealing: Apply joint sealant between slabs to prevent water infiltration.
  • Long-term care: Seal the driveway every 2–3 years for protection.
  • DIY time-saver: Rent a small concrete mixer if replacing more than one section.

For more help, see our guide on how to repair cracks in a concrete driveway for smaller fixes.

Conclusion

Replacing a section of a concrete driveway may seem intimidating, but with the right tools and techniques, it’s a manageable project for most homeowners. By cutting out the damaged area, preparing a solid base, reinforcing, pouring, and curing properly, you’ll restore your driveway’s strength and appearance.

A little effort now saves thousands in replacement costs and keeps your driveway looking sharp for years. Add section replacement to your maintenance plan, and you’ll enjoy a safe, durable, and attractive driveway long into the future.