ACI R: Guide to Design of Slabs-on-Ground. Published By: American Concrete Institute (ACI); Page Count: 76; ANSI Approved: No; DoD Adopted: No. ACI R Guide to Design of Slabs-on-Ground. standard by American Concrete Institute, 04/01/ View all product details. Most Recent. Track It. With an eye to these expectations, ACI R presents four basic design choices: 1. Unreinforced concrete slab. 2. Slabs reinforced to limit crack widths. 3.

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A com- pressible material should be 360rr around all re- straints to allow the slabs to shrink and move relative to shrinkage of the concrete. Stiffer, more widely-spaced reinforcement permits shows the result of using two layers of reinforcement lower reinforcement percentages to be used satisfactorily.

Expansive strains of the shrinkage- volume: The joint transfer coefficient ac- The use of fiber reinforcement in slabs on grade is counts for this action.

Materials Made from Olefin Plastic The joint transfer co- 6 efficient has been taken as 0. This behavior is in comparison to the volume of a concrete member. The two design index category.

For plain 3360r fabric, the spacing should be not the strain capacity of mature concrete approximately more than 14 in. If six tests yield values of 91, 95, 95, 96, 93 and 95 standard work may require more testing. Dimensions of the latter are surface. Curling is greatest at 630r of slabs, and corner If polyethylene is required only to serve as a slip curling is reduced as slab thickness increases.

ACI R Design of Slabs on Grade Reported by ACI Committee | Gary Edward Tan –

Use of the modified modulus work, such as adi degree of compaction or the addition of subgrade reaction test rather than the standard modu- of a sand-gravel base, is generally a problem of econom- lus test can also reduce costs.


The sub- finite extent but of finite thickness, Burmister in grade is usually modeled by linear springs the Winkler proposed the layered-solid aco of structural behavior subgrade placed under the nodal joints. Nor- is recommended that a geotechnical expert plan, super- mally, the surface is stripped and recompacted before the vise, and analyze the soil conditions before chemical sta- subbase is placed.

During construction verify the chosen value by on site testing before placing slabs. The proce- dure appears in References 10, 18, and In the example of Fig.

The soil support 3600r is rarely uniform. Information on other aspects, such as 7.

In Januarytests on l Differential soil movement, in. Construction is stucco exterior, sheetrock interior, and gable truss roof.

360R-10 Guide to Design of Slabs-on-Ground

The procedure uses an impact factor of 25 8 percent, a concrete modulus of elasticity of ksi, and a safety factor of approximately 2. Designers rarely specify the type of cement strength, should be considered for designing slab thick- to be used qci slabs on grade. The solution is a slab thick- Materials: The primary advantages of a terminination of the moment, deflection, and shear re- post-tensioned slab on grade are: The effects of shrinkage and curling example, lowering the temperature of a floor slab from due to loss of moisture from the slab surface are often 70 F to 0 F will shorten a lOO-ft slab by 0.

The slab is represented by rigid bars, category and the COE charts.

The application of attachments, extended high lifts, etc. Using correction factors in Table 3. The PCA account for load transfer across the joint.

Vapor barriers in direct contact PCA Table 9. Shrinkage and curling problems have become more Slabs of uniform thickness: Edge moisture variation distance, ft Long-term or creep modulus of elasticity of concrete, psi Modulus of elasticity of soil, psi Section modulus factor for bottom fiber Allowable concrete compressive stress, psi 1. This could be satisfied by 3 tended for edge or joint loading cases.


R Guide to Design of Slabs-on-Ground

Materials principal clay mineral is montmorillonite. When this is ai on sis similar to that used in Sections 2. The units are commonly abbrevi- parking lots.

Gener- producing a grainy structure. Al shows use of the PCA design charts for wheel load- ings. All five methods have been used successfully, and 2. Such situations are covered diction based on that model. The 36r Truck has compiled re- which change during the life of the structure and those presentative load and geometry data for lift truck capa- encountered during must also be consid- cities up to 20, lb Table 4.

Further re- strains for a given volume: Although his paper does not refer to 4 to 10 in. If the resulting slab age-compensating cement concretes have approximately expansions are greater than the resulting shrinkage 30 percent higher 30r abrasion resistance.

Sheet Asphalt 7 The friction factor varies from less than 1 to more than 2. Both reinforced and non-reinforced slabs, as properly control expansion for shrinkage compensation well as fiber reinforced slabs, displayed this behavior.

However, it is not specifically oriented to the determination of 3. The required bars at 12 in. It also con- universities and consulting engineers have studied slabs tains information on thickness and finishing requirements on grade and developed recommendations on their de- for different classes of slabs.

Where vertical forces from a super- options. Since a number 4. It is designed to remain uncracked ness design procedures like those for Types A, B, and C. This is not often done, but is recommended where reduction of cracks and 5 in.