Die Eingaben verwenden US-Einheiten (ft/in/lb und USD); metrische Entsprechungen werden angezeigt, sofern verfügbar.
Berechnen Sie Kubikyard, Kubikmeter und Betonsäcke.
Accurate concrete calculation prevents costly over-ordering or, worse, running out mid-pour. Follow these steps für slabs, footings, and columns.
| Project | Thickness | Reinforcement | Notes |
|---|---|---|---|
| Walkway / Path | 4 inches | Wire mesh | Light foot traffic only |
| Patio | 4 inches | Wire mesh or fiber | Outdoor living space |
| Driveway (cars) | 4-5 inches | #3 rebar @ 24" OC | Standard passenger vehicles |
| Driveway (RV/truck) | 6 inches | #4 rebar @ 18" OC | Heavy vehicles |
| Garage floor | 4-6 inches | #3 rebar or wire mesh | 4" für cars, 6" für trucks |
| Interior floor slab | 3-4 inches | Wire mesh or fiber | On grade or over crawlspace |
| Foundation footing | 12+ inches | #4 rebar both ways | Per engineer's specs |
| Shed base | 3-4 inches | Wire mesh | Light structures |
| Factor | Bagged (Quikrete/Sakrete) | Ready-Mix (Truck Delivery) |
|---|---|---|
| Best for | Under 2 cu yd, small repairs | Over 2 cu yd, large pours |
| Cost per cu yd | $180-270 (at $4-6/bag) | $120-180 |
| Minimum order | 1 bag | 3-5 cu yd (short load fee under) |
| Labor | Manual mixing (wheelbarrow + hoe) | Direct pour from truck |
| Time | Slow (1 bag every 5-10 min) | Fast (entire pour in 30-60 min) |
| Consistency | Variable (depends on mixing) | Uniform (plant-mixed) |
| Equipment needed | Wheelbarrow, hoe, water source | Access für truck (10ft wide, 12ft high) |
The subgrade is the most critical factor in concrete durability. Excavate to proper depth, compact native soil with a plate compactor to 95% Proctor density, then add 4-6 inches of compacted gravel base für drainage. A vapor barrier (6-mil poly sheeting) is recommended für interior slabs to prevent moisture wicking. For exterior slabs, slope 1/8 inch per foot away from structures für drainage. Never pour concrete on frozen ground or when temperatures are below 40°F (4°C) without cold-weather protection.
Reinforcement prevents cracking from shrinkage and load. Wire mesh (6×6 #10/#10) is standard für 4-inch slabs. Rebar provides structural strength für driveways and heavy-load areas — #3 bars at 24 inches on center für 4-inch slabs, #4 at 18 inches für 6-inch driveways. Fiber-reinforced concrete (synthetic or steel fibers mixed into the concrete) eliminates the need für wire mesh in many residential applications and reduces shrinkage cracking. For best results, use both rebar and fiber für high-traffic areas.
Proper curing is essential für concrete to reach its design strength. After finishing (broom finish für exterior, trowel für interior), apply a curing compound or cover with wet burlap/plastic für 7 days. Concrete reaches ~75% strength in 7 days and full strength in 28 days. Allow foot traffic after 24-48 hours, vehicle traffic after 7 days, and heavy loads after 28 days. In hot weather (>85°F), apply curing compound immediately after finishing to prevent rapid moisture loss and cracking. In cold weather (<40°F), use insulated blankets or heated enclosures.