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Planning for slab-on-ground placement

Planning for slab-on-ground placement. Chapter 1. Chapter Topics. Introduction Specification requirements Determining the size of concrete placements Ordering concrete Concrete delivery Equipment Size of placing and finishing crews Preconstruction meeting. Specification Requirements.

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Planning for slab-on-ground placement

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  1. Planning for slab-on-ground placement Chapter 1

  2. Chapter Topics • Introduction • Specification requirements • Determining the size of concrete placements • Ordering concrete • Concrete delivery • Equipment • Size of placing and finishing crews • Preconstruction meeting

  3. Specification Requirements • ACI flatwork finishers • Material properties • Concrete strength and durability • Vapor retarders or barriers • Reinforcement • Slab flatness and levelness • Joint spacing and depth • Curing and protection

  4. Concrete Delivery • Concrete is perishable—be prepared • Site access—flagger needed—cone area • Space for two trucks to discharge • ASTM C 94 Specification for Ready-Mixed Concrete • Discharged within 1 ½ hrs or 300 revolutions • Plan for ready mix trucks • Spacing of trucks, 15 minutes? • Discharge of trucks, 5 to 15 minutes • Washout of trucks

  5. Have Equipment Ready • And spare equipment • Emergency bulkheads • Equipment Producitivity • Hand finishing crew: 1000 to 2000 sf • Walk-behind: 1000 to 3000 sf • Ride-on trowel: 3000 to 6000 sf • Laser-guided, wheel-mounted screed: 30,000 to 50,000 sf

  6. Size of Placing and Finishing Crews • Labor cost for placement • Workers sick or injured • Concrete sets faster • Weather changes; hot or rain • Equipment breakdowns • Early sawing to minimize cracking • Overlap placing and finishing crews

  7. Placing Crew • Finishing foreman • Discharging concrete • Spreading concrete • Screed operators • Finishers • General assistance

  8. Finishing Crew • Concrete and Weather • Working edges • Walk-behind to float fast-setting loads • Riding trowels • General assistance

  9. Checklist for Placing and Finishing • Volume of concrete • Concrete delivery rate • Haul time • Truck spacing • Placing equipment • Spare equipment • Crews

  10. End of Chapter 1

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