The California Bearing Ratio. Scope. This test method covers the determination of the california bearing ratio (cbr) of pavement subgrade. AASHTO Designation: T (). 1. SCOPE. This test method covers the determination of the California Bearing Ratio (CBR) of pavement subgrade. This test method covers the determination of the California Bearing Ratio (CBR) of pavement subgrade, subbase, and base/course materials from laboratory compacted specimens. While traditionally this method of specimen preparation has been used to avoid the error inherent in.
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Aashto t Cbr - Free download as PDF File .pdf), Text File .txt) or read online for free. (ASTM D and AASHTO T). Yet there are varia- tions in the procedure used by various transportation agencies, which result in confusion among. 2 A. L. 5. L. . -. 30 31 ! Material Description.
Remove the extension collar. Laboratory Determination of Moisture Content of Soils. Note 6—Some laboratories may prefer to test only one specimen which would be compacted to maximum dry density at optimum moisture content as determined by either T 99 or T Compact the first of the three portions of soil-water mixture into the mold.
Mix each of the three 6. Determination of moisture content shall be done in accordance with T Note 5—Generally about Bearing Ratio for a Range of Water Content: Prepare specimens in accordance with Section 6.
Insert the spacer disk into the mold and place a coarse filter paper on top of the disk. Perform all compaction in the CBR molds. Remove the spacer disk.
More than 56 blows per layer are generally required to mold a CBR specimen to percent of the maximum dry density determined by T 99 Method D. Clamp the mold to the base plate. Surface irregularities should be patched with small-sized material.
Soak the specimen 96 hours four days. Load readings at penetrations of Application of Load—Apply the loads to the penetration piston so the rate of penetration is uniform at 1. Note 7—A shorter immersion period not less than 24 hours may be used for soil-aggregate materials that drain readily if tests show that the shorter period does not affect the test results.
Seating Piston—Seat the penetration piston with a 44 N lb load.
The total mass shall be a minimum of 4. Place the tripod with dial indicator on top of the mold and make an initial dial reading. Remove the specimens from the soaking tank. Care shall be taken not to disturb the surface of the specimens during removal of the water. Note 9—The moisture content of the upper 25 mm 1 in. Note 8—The mass of the specimens may be determined after draining when it is desired to determine the average wet density of the soaked and drained material.
After seating the penetration piston the remainder of the surcharge weights shall then be placed around the piston. For some clay soils. Record the load when the penetration is 0. Immerse the mold in water to allow free access of water to top and bottom of the specimen. Moisture samples shall weigh at least g for fine-grained soils and g for granular soils. To prevent displacement of soft materials into the hole of the surcharge weights. SOAKING Place the swell plate with adjustable stem on the soil sample in the mold and apply sufficient annular weights to produce an intensity of loading equal to the mass of the subbase and base courses and surfacing above the tested material.
After draining. During soaking. Additional mass shall be added in increments of 2.
At the end of 96 hours. Figure 2—Correction of Stress-Strain Curves In some instances. To obtain the true stress-strain relationships. See dashed lines. California Bearing Ratio—The corrected load values shall be determined for each specimen at 2.
California Bearing Ratio values are obtained in percent by dividing the corrected load values at 2. If the ratio at 5.
The CBR is generally selected at 2. If the check test gives a similar result. The design CBR may then be determined at the desired percentage of the maximum dry density. Dry density as molded percent.
Moisture content as molded percent.
All samples compacted in five layers. Swell percent of original length percent. All samples soaked top and bottom four days. The data plotted as shown represents the response of the soil over the range of water content specified.
Select the CBR for reporting as the lowest CBR within the specified water content range having a dry unit mass between the specified minimum and the dry unit mass produced by compaction within the water content range.
Compaction effort number of blows per layer. California Bearing Ratio percent.
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