What is the minimum reinforcement in slab on grade?
Above and below: Properly placed/supported reinforcement will result in properly located reinforcement in the slab. Consult manufacturers’ literature for maximum chair and other support spacing and use a 12-inch minimum reinforcement spacing so workers can avoid walking on the reinforcement.
What is minimum reinforcement criteria?
The minimum reinforcement ratio is the lowest possible quantity of steel that should be embedded in structural concrete elements to prevent premature failure after losing the tensile strength. The minimum reinforcement ratio controls the cracking of concrete members.
What is the minimum cover for a #4 reinforcing bar in a slab on grade?
3/4 inch
Tabulated values for restrained assemblies apply to beams spaced more than 4 feet on center. For restrained beams spaced 4 feet or less on center, minimum cover of 3/4 inch is adequate for ratings of 4 hours or less.
What is the minimum required compressive strength for a concrete slab on grade?
3,500 psi
Concrete Design Criteria: a. Except for lean concrete, which is typically used for backfill, minimum 28-day concrete strength shall be 3,000 psi, for below grade construction, and 3,500 psi for slabs-on-grade and above-grade construction.
Where to place concrete slab on grade reinforcing design?
When the Subgrade Drag formula is used for steel design, the recommendation for concrete cover above the reinforcing is two inches below the top of the slab. However, it is reasonable to allow for an envelope of steel placement ranging from two inches below the top of the slab to the center of the slab.
How is reinforcement used in the construction of concrete?
With some limitations, reinforcement for slabs can be sized using the Subgrade Drag Theory in order to increase the spacing of control or construction joints. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. ACI 360, “Design of Slabs-on-Grade”, refers to this as a Type B slab.
What makes a good concrete slab on grade?
Other considerations that play a role in the successful construction of a slab on grade include; proper proportioning of the concrete mix, joint design and performance, and the slab thickness. Floor Classifications
How big of a bar should I use for slab reinforcement?
The most common bar sizes encountered when using deformed reinforcement for typical lightly loaded slabs are #4 and #5 bars. However, it is recommended that #5 bars be used as a minimum as bars of smaller diameter are much more susceptible to damage due to foot traffic during the placing operation.