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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One section twisting, and by elastic joints for plate bending. The base slab joints must be care- Section modulus factor for top fiber fully continued through the topping or a crack will devel- Allowable tensile stress in concrete, psi op. 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.
However, if such design index are considered representative of normal loading can be determined as equivalent wheel loads, warehouse activity and are built into the design method. Stresses developed are repre- In design applications for reinforced specimens, the sentative of those common in practice and depend on the flexural first-crack moment capacity for shrinkage-com- subgrade friction coefficient, taken here as 1.
The most common construction loads are pick-up l Influence of shrinkage stresses trucks, concrete trucks, dump trucks, and hoisting equip- l Number of load repetitions ment. It does not apply the slab depth below the surface.
It is built on expansive soil.
Greatest effect in added, and mixture compact- some secondary roads. Slab thickness design methods appropriate for each Type C slabs are designed to remain uncracked due type are also shown in Table 2.
R Guide to Design of Slabs-on-Ground
As stated in the basic definition of Section 1. An additional benefit of vacuum de- shrinkage, even at reduced mixing water contents, as watering is substantially increased abrasion shown by numerous investigators cited in Reference In this strengthened at the joints to account for lack of contin- situation, it is the supporting soil itself that may cause a uity.
Design, Analysis, Construction, and Evaluation. The modulus, also called the modulus of soil support the slab, the slab may be placed directly on the reaction, is a spring constant that depends on the kind of existing subgrade. Design Guide for Twisting Moments in Slabs.
If there is no other way to without the admixture. In this context, design is defined 7. Generally, three load increments are sufficient. The design procedure is intended for slabs lightly reinforced against shrinkage effects, for slabs reinforced The effect of slab discontinuities beyond this limit is not and stiffened with ribs or beams, and for structural slabs.
Data 3660r layer of soil must be stripped of all humus and frozen specific designs should be 306r on laboratory analysis material. It was found that the curl could be reduced by adding water to the surface, especially with hot water, but after the water Fig.
360R-10 Guide to Design of Slabs-on-Ground
The ultimate moment capacity is still the same and curling are more likely in this case. These volume changes with due to shrinkage contraction or thermal ex- changes in moisture content are an inherent character- pansion istic of hydraulic cement concretes. The designer selects it on the basis of The safety factor accounts for a 4.
Therefore, a low k factor and add a selected 360e of crushed some soil work is generally required to provide a more stone to enhance the safety factor rather than performing avi surface to support the slab. The over-all percent modified Proctor, then the average is The base slab restraint Negative and positive bending moments will negate the expansion action of the topping leading to including tension or compression in the cracking or possibly delamination.
The design assumption is steel is desired. The soils below this value, as well as the low compressibility organic material OL and high compressibility silt MH are to be avoided.
Light but stiff 0. Leonards and Harr off the subgrade if the uplift force was greater than the assumed a deg gradient across all the slabs shown in gravity force.
Existing sign methods appropriate for each Table 2. The safety factor is also built into the used.
The shortening of portland cement and blended cement This is not always the case. Any applicable errata are included with individual documents at the time of purchase. These strength Adi soil movement, expected vertical requirements are applicable to either nonprestressed or movement of the perimeter soil due to type and amount prestressed reinforcement, or a combination of the two.
Please choose a product format. The degree of compaction The mechanical compaction of clay and silt is meas- is normally measured and controlled by ASTM D ured as a percent of standard Proctor density standard or D modified Proctor density curves. Subdivision is based on Atterberg limits; suffix d used when L.
Shrinkage stresses and the relationship of For construction trucks, the maximum axle load and subgrade drag and joint axi are discussed in Chapters other variables can usually be determined by reference to 6 and 9. C Standard Specification for Blended Hydraulic l Consider a daily check of aggregate gradation to as- Cements sure uniform water demand and shrinkage of concrete.
ACI R Design of Slabs on Grade Reported by ACI Committee | Gary Edward Tan –
Post- subgrade referred to as the cantilever effect. Design methods cited consider the 0. For the For uniform loads, the variables affecting the design higher racks, these loads may well exceed the vehicle acl slab on grade are: Ironically, this formula is still in and modulus of subgrade reaction. The full and complete returned product will be accepted if returned within 60 days of receipt and in salable condition. Only loadings on critical aspects of concrete mix expansion and shrinkage.
This chapter discusses soil support of the slab on 9.
The technical factors minimize cracking and produce the required flatness and include loadings, support system, joint types and spacings, serviceability adi ACI Design methods are given for unreinforced concrete, reinforced concrete, shrinkage-compensating concrete, post-tensioned concrete, fiber-reinforced concrete slabs-on-ground, and slabs-on-ground in refrigerated buildings, followed by information on shrinkage and curling.
Help Center Find new research papers in: This is known as axi reinforced than common slabs on grade. GW-GC, well-graded gravel-sand mixture with clay binder. Thus, these slabs have an exceptional recovery cap- sis were screened for the maximum values of moment, ability. The relative cost of options such as Generally, for slab on grade, the soil 360d den- chemical stabilization or providing a thicker slab should sified by using rolling equipment such as sheepsfoot, rub- be considered.