Planning for slab-on-ground placement Chapter 1. Chapter Topics Introduction Specification requirements Determining the size of concrete placements Ordering.

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Presentation transcript:

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 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

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

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

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

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

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

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