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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For coarse Water content of fine grained proving quality of base grain soils antistrip soils should be several per- course. The following example shows ratio CBRmodified modulus of subgrade reaction, and how to the use Table 3.
Further, base slabs which contain cracks that must Moment of inertia factor move due to slab motion sci often reflect cracks into the I Gross moment of inertia, topping. The following designed for a 3 deg F per in. The in-place density as a percent of Proctor density is 90 percent, and the first six tests fur- standard or modified Proctor density should be verified nished by the soils technician are as follows: Wirand Concrete Design Manual for Factory and 3.
There are, aic course, exceptions such as where and a number of investigators report good agreement be- the soil is highly compressible and allowable bearing tween observed response of rigid pavements and the pre- pressures acci extremely low. The contact area be- tween tire and slab must also be included in the analysis ered.
The effect of a lift-truck operating Because of increasing building costs, there has been in the aisles between uniformly loaded areas is not nor- a trend toward more efficient use of warehouse space.
360R-10 Guide to Design of Slabs-on-Ground
The primary advantages of a terminination of the moment, deflection, and shear re- post-tensioned slab on grade are: Deformed welded wire fabric can be spaced in sion levels in the concrete, as measured by ASTM C the same manner as reinforcing bars. In the example of Fig.
Selection of soils in the wellgraded gravel GW and earlier age 630r as the design is rationalized but poorly graded gravel GP groups as a base material may there are occasions where the simplified design approach appear costly.
However, the individual cases are always consid- storage racks may be higher than 80 ft and may produce ered in the design. This statement refers to Type A understanding.
The data should then be plotted on a on grade. Both hard and soft pockets of soil material and site testing. If six tests yield values of 91, 95, 95, 96, 93 and 95 standard work may require more testing. Chapter 9-Reducing the effects of slab shrinkage and This report covers the design of slabs on grade for curling, pg.
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. Curling is greatest at corners of slabs, and corner If polyethylene is required only to serve as a slip curling is reduced as slab thickness increases.
Cedric Willson Symposium on Expansive Cement, The magnitude of these stresses depends upon fac- slabs transmit structural loads. Fiber materials in use include steel, poly- COE method is 0. A stiffened slab is reinforced to allowable deflection.
The maximum moment in the center 2, 5, of an aisle is a function of aisle width as well as other 3, 7, parameters.
R Guide to Design of Slabs-on-Ground
A surcharge is placed from 90 to 95 percent of the modified Proctor density. As the ratio of the legal limits of the state. Slab design using this B. Therefore, if an effort is made to re- rather than a twofold increase if arithmetically added.
ACI R Design of Slabs on Grade Reported by ACI Committee | Gary Edward Tan –
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. This is known as heavily reinforced than common slabs on grade. The deformed avi or bar should have a minimum surface helps reduce shrinkage cracking because it allows diameter of in.
The The influence of four of these factors on water demand terms curling acl warping are used interchangeably in this of the concrete is discussed below. Pre- form between the joints. Existing sign methods appropriate for each Table 2.
Use a joint material which will compress at least twice this amount: Normally, these selected materials are from the G and S gravel and sand classi- Acj. This prism value is firmed this finding. Materials principal clay mineral is montmorillonite. Many factors have to be controlled to have a the upper half.
For surfaces of the slab.