ACI 360R PDF

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

Edge lift l Design for center lift condition 3 Cation exchange activity: Design concepts pates that the applied loadings may crack the slab. Compressive stresses as high as 45 thick, but thicknesses of 3 in. An not require detailed design unless poor soil conditions early attempt at a rational approach to design was made are encountered. The final elevation of the base material than densification stabilization, chemical stabilization is should be no more than in.

In addition, periodicals such as 1. Concrete slabs are usually subjected to some com- Frost action may be critical to silts, clays, and some bination of the following: Maintain this load until the settle- ment is stabilized; then release the load and reset the dial gages to zero.

R Guide to Design of Slabs-on-Ground

Two spaces at 3 ft 2 in. In this context, design is defined 7. Risk of slab failure at an ics. If six tests yield values of 91, 95, 95, 96, 93 and 95 standard work may require more testing.

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Normally there is a wide range of soils across the For small projects, it may be advantageous to assume site. Slab coefficient of friction is: The upward slab edge thickness. Ac observation, deflection and shear cal-culations are b Total 306r Shear Stress within permissible tolerances.

In addition, the slab may be subjected to other l Fatigue and impact effects loads such as scaffolding and material pallets.

Using principles of pre- l A lower level of total residual shrinkage strain at stressing and Fig.

Since cracking is anticipated, ACI joint spacings, usually set for crack control, are not Structurally active reinforcement and fiber rein- critical, but they must be set to accommodate the con- forcement are also used in slabs on grade, but separate struction process. A geotechnical engineer ate factors of safety and the variables that control load should examine the soil data and recommend appropriate effects are described.

Silty gravels, gravel-sand-silt mixtures “A” line 360rr P. Each combination must be based primarily on grain size and the Atterberg limits as selected based on the requirements of the specific indicated in Table 3.

Generally, a heavy piece of construction equipment can provide the lb load required for the test.

Should high steel ratios be even though a wider spacing is easier for workers to step required for structural design conditions, higher expan- through.

OL Organic silts and organic silty clays of 50 low plasticity 40 Inorganic silts, micaceous or diatoma- 30 MH ceous fine sandy or silty soils, elastic silts ii;;; 20 CH Inorganic clays of high plasticity, fat clays c OH Organic clays of medium to high 1O plasticity, acii silts Liquid limit Pt Peat and other highly organic soils of GM and SM groups into subdivisions of d and u are for ai and airfields only.

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The units are commonly abbrevi- parking lots.

The radius of relative stiffness in inches is found by taking the fourth root of the results found by dividing the concrete plate stiffness by the subgrade modulus 2. The number of load repetitions, which may sidered since the slab is usually constructed after the be used to help establish a factor of safety, is a function building is enclosed.

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

Ray Rose Larry Gillengerton A. The magnitude of these stresses depends upon fac- slabs transmit structural loads. Remember me on this computer.

Consider using or day C Standard Test Method for Specific Gravity strengths in slab thickness design to permit use of con- and Absorption of Coarse Aggregate crete with lower shrinkage than could be obtained with C Standard Specification for Portland Cement the same compressive strength at 28 days. These soils can experience large changes of vol- l Vehicle wheel loads ume when subjected to freezing cycles. Extended curing only delays maintenance cost may well be achieved with the least curling, it does not reduce curling.

The reinforcement must be stiff viously cited design are only appropriate up enough so that it can be accurately located in the top to the level of loading that causes the cracking stress of half of the slab.