reinforced slab on grade joint spacing

a. When concrete slab are poured on grade, steel reinforcement and control joints are used to control shrinkage and expansion. ... Load transfer at the control and construction joints. Concrete slabs on grade are a very common type of concrete construction. Determine slab thickness and concrete strength as if the slab were unreinforced 4. There's no generally-accepted rule of thumb as to how to space rebar in a concrete slab. b. Ch. Use dowels at construction joints, unless load transfer is not needed 6. A slab with this joint spacing may be reinforced with bars (ASTM A 615, A 616, A 617, or A 706) or WWF (ASTM A 185 or A 497). MORE JOINTING TIPS. A 4" thick slab should have joints 1" deep. 5 Slabs on Grade - “the purpose of isolation joints in slabs on grade is to allow horizontal and vertical movement between the slab and adjoining structures such as walls, columns, footings, or specially loaded areas (machinery bases). Determine joint spacing as if the slab were unreinforced 5. Figure 1a: Joint Spacing in Meters. Control Joints are not intended to stop cracking but rather control cracking; It is best to cut joints as early as possible either while finishing with a concrete groover or within 6-18 hours after finishing with a concrete saw. Thin slabs and long joint spacing tend to increase curling. CONTROL JOINT SPACING. The maximum joint spacing should be 24 to 36 times the thickness of the slab. Space joints (in feet) no more than 2-3 times the slab thickness (in inches). There are many variables that influence the decision of how much space to leave, including the maximum load the slab is likely to have to support, the bearing capacity of the soil, the diameter of the reinforcing rebar, the likelihood of frost heaving the slab, and whether or not the slab is on a level grade. 2. CFS believes that steel 8. 9. Joint spacing that is greater than 15 feet require the use of load transfer devices (dowels or diamond plates). Reinforced Concrete Design Design of concrete slab on grade Slab Reinforcement and spacing of control joints. (300 mm lap both sides of joint) 100 mm concrete slab (first pour) R12 dowel bars with bond breaker applied to reinforcing on one side of joint grade 500E reinforcing mesh BEFORE THE CANTERBURY EARTHQUAKES, concrete floor slabs for single-storey dwellings could be unreinforced or reinforced with polypropylene fibres. Floor slabs can range from a ... joint design and performance, and the slab thickness. Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness. joints also have this spacing for strip placement of the concrete. For 6" to 10" thick slabs on grade with 'k' values between 100 pci and 200 pci, the increase in stress, 'i', due to a 2nd wheel (or post) load as a percentage of stress for a single wheel (or post) load is approximately 15% to 20% for a wheel (or post) spacing of 3' to 4'. 24-foot joint spacing. The movements of these structural elements are likely different than those of a slab-on-grade due to In industrial floors, close joint spacing may be undesirable because of the increased number of joints and increased joint maintenance problems. Omit dowels at sawcut joints (but see discussion below) concretefibersolutions.com -571 1323 WHY STEEL FIBERS? Cut joints deep enough Cut joints 25% of the depth of the slab. Plan out your control joint spacing 24-36 times the depth of your concrete slab A 4" slab should have joints 8-12 feet apart. When concrete slab shrink or expansion, it will drag the soil beneath the slab … To se-lect the appropriate steel area (As), use the subgrade drag equation: For Grade 60 rebar As = F L w/2 fs where F (the subgrade Type and spacing of the control and construction joints. Workmanship and jobsite conditions. Chapter 6—Design of unreinforced concrete slabs, p. 360R-29 6.1—Introduction 6.2—Thickness design methods 6.3—Shear transfer at joints 6.4—Maximum joint spacing Chapter 7—Design of slabs reinforced for crack-width control, p. 360R-32 7.1—Introduction 7.2—Thickness design methods 7.3—Reinforcement for crack-width control only For this reason, thin unbonded toppings need to have a fairly close joint spacing. Figure 1b: Joint Spacing in Feet Contraction joints may be tooled into the concrete surface at the time of placement. For wheel (or post) spacings of 5' to 15', the increase in stress is How to cut joints Groover tools cut joints in fresh concrete.

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