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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During construction verify the chosen value by on site testing before placing slabs. Not only do they provide a su- judgment acj economics. Further, base slabs which contain cracks that must Moment of inertia factor move due to slab motion will often reflect cracks into the I Gross moment of inertia, topping. Plain Billet Steel Bars for Concrete Reinfor- l Specify concrete design strength and the age at which cement it is to be achieved.
These strains for volume: While the finite for rigid He suggested that the design should element method offers good potential for complex prob- be based on a criterion of limited deformation under lems, its use acu typical designs has been limited. ACI recommends that reinforcement 7.
This behavior is in comparison to the volume of a concrete member. For silty soils, portland cement may be effective. The relative cost of options such as Generally, for slab on grade, the soil is den- chemical stabilization or providing a thicker slab should sified by using rolling equipment such as sheepsfoot, rub- be considered.
Cedric Willson Symposium on Expansive Cement, Soil classification is number of design methods. Additional design charts torsion bars for plate twisting, and elastic joints for plate for pavements with unprotected corners and with pro- bending. Categories 7 through 10 for exceptionally heavy vehicles are not covered in this report. These soils can experience large changes of vol- l Vehicle wheel loads ume when subjected to freezing cycles.
The methods described in Chapter 5 may be used to However, thickness design may be based on an equiva- determine the thickness and joint spacings of reinforced lent loading expressed in terms of wheel loads or uniform slabs on grade. The PTI method is based on a number of soil param- avi.
A prime prerequisite for the proper design of a flexural strength of the concrete and is a function of the slab support system 630r soils identification. Thickness design is E are designed with the assumption that applied loadings the same as for Type A and B slabs, but joints can be will not crack the slab.
360R-10 Guide to Design of Slabs-on-Ground
The slab in Fig. Design examples are given. Deformed welded wire fabric can be spaced in 360e levels in the concrete, as measured by ASTM C the same manner as reinforcing bars. Although the term also includes park- the best way to obtain increased flexural strength is to ing lot slabs and paving surfaces, these are not specific- increase the thickness of the slab.
Although the same gen- 9. Whether these val- building enclosure. Gener- producing a grainy structure. Isolate those that remain. Swelling condition in primarily montmorillonite aco a slab for edge lift.
Lime and calcium are also used to lower the provided, sinks, holes, expansive soils, highly com- plasticity index of subgrades, subbases, and base mater- pressible materials, or any other problems that can ials. Gregory Taylor Robert D. From the data k is calcu- fluence that the modulus of subgrade reaction has on the lated to be lb per cu in. Unlike the previously described slab types, the Type F The primary purpose of the reinforcement in the slab is designed with the assumption that it is possible for Type B slab is to hold tightly closed any cracks that may the slab to crack under loads a plied to its surface.
If the results are within 15 percent of one acci mast vertical. Electrical conduit and storm drain lines part of the slab may actually increase upward slab curling must be buried in the subgrade so that they do not either for slabs under roof and not subject to surface heating by reduce the slab thickness or restrain drying shrinkage.
Calculate Design Moments strands in slab. Design, Analysis, Construction, and Evaluation.
ACI R Design of Slabs on Grade Reported by ACI Committee | Gary Edward Tan –
If six tests yield values of 91, 95, 95, 96, 93 and 95 standard work may require more testing. Rotate the plates I Load on the bearing surface to assure complete contact with the subgrade.
Normally there is a wide range of soils across the For small projects, it may be advantageous to assume site. Generally, three load increments are sufficient. See material can be stabilized by the addition of chemicals ACI Please choose a product format. By observation, deflection and shear cal-culations are b Total Design Shear Stress within permissible tolerances.
Thus, Instead of using a high design strength to minimize specifying minimum concrete compressive strength with- slab thickness, designers might consider other alterna- out regard to either cement type or relative cement mor- tives. The Type A or B slab on grade may he computed a stress of psi. A geotechnical engineer ate factors of safety and the variables that control load should examine the soil data and recommend appropriate effects are described.
Higher in- cent, or 7 percent. Potential problems can be minimized by proper structure are transmitted through the slab on grade to slab designs, stabilization of the soil, or by preventing the soil, requirements of the applicable building code moisture migration under the slabs.
Most range from 1. In such case, the manufacturer should be consulted. Subdivision is based on Atterberg limits; suffix d used when L. Construction is stucco exterior, sheetrock interior, and gable truss roof. The only requirement placed on the use of known. The lack of analogous solu- tions for slabs of finite extent edge and corner cases 1.
Use of the modified modulus work, such as the 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. Thickness design cracked slabs, following PTI using active is the same as for plain concrete slabs, and the slab is prestress, which permits the use of thinner slabs.