Division 03: Concrete
Understand how to estimate and interpret specifications for cast-in-place, pre-cast, rebar reinforcement, and finishes. Division 03 defines how concrete is placed, protected, and tested on every project.
🎥 Study Video
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📄 Cheat Sheet
Download our quick-reference PDF covering concrete mixes, reinforcing standards, and forming methods.
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💡 Instructor Insights
- Always verify mix design submittals — not all concrete is created equal.
- Look for strength ratings (PSI), cure time, and additives specified.
- Check spec section numbers (03 30 00 for cast-in-place, 03 40 00 for pre-cast).
- Don’t forget finish standards: broom, smooth, exposed aggregate, etc.
- Estimate rebar and formwork based on drawings but confirm with spec requirements.
📥 Quiz & Resources
Test your concrete knowledge from Division 03. Review the answers below to ensure you’re ready for the field or estimate table.
- Why must you verify the concrete mix design?
Answer: Not all concrete is the same — mix designs must meet specified strength, durability, and additive requirements. - What does PSI indicate in concrete specs?
Answer: PSI measures compressive strength (e.g., 3000 PSI means it can withstand 3000 pounds per square inch). - What section typically covers cast-in-place concrete?
Answer: Section 03 30 00. - What are examples of concrete finish requirements?
Answer: Broom finish, smooth trowel, exposed aggregate, or polished surfaces. - Why must rebar and formwork be verified with the specs?
Answer: The specs confirm spacing, size, type, and material — ensuring compliance and safety.
Division 03: Concrete
🔹 Key Teaching Points
1️⃣ Always Verify Mix Design Submittals
- Not all concrete is the same — mix design must match what’s required.
- Confirm approved PSI strength, admixtures, and water-cement ratio.
2️⃣ Know Your Strength Ratings
- Specs will call for minimum compressive strength (e.g. 3000 PSI).
- Also check curing time, slump requirements, and any additives like fibers or plasticizers.
3️⃣ Follow the Section Numbers
- 03 30 00 – Cast-in-place concrete
- 03 40 00 – Pre-cast concrete
- Be sure you’re reviewing the correct sub-section for scope!
4️⃣ Finish Standards Matter
- Broom, smooth, exposed aggregate, or troweled — finish specs impact labor and tools.
- Incorrect finish can lead to rework or rejection during inspection.
5️⃣ Estimate Rebar and Formwork Carefully
- Use drawings for quantity, but confirm spacing, sizes, and forming details in specs.
- Check if welded wire mesh or specific forming materials are required.
✅ Wrap-Up Summary
- Division 03 is about more than just pouring concrete.
- Specs drive strength, finish, formwork, and rebar details.
- Overlooking these = rework, inspection failure, or profit loss.