Standard Method of Test for
The California Bearing Ratio
加利福利亚承载比标准试验方法
AASHTO 指示: T 193-10
1. SCOPE范围
1.1 This test method covers the determination of the California Bearing Ratio (CBR) of pavement
subgrade, subba, and ba/cour materials from laboratory compacted specimens. The test
method is primarily intended for, but not limited to, evaluating the strength of cohesive materials
having maximum particle sizes less than 19 mm (3/4 in.).
该测试方法涵盖了从试验室压实试件测定的关于路面路基，底基层的CBR 。
该测试方法主要适用于，但不限于，评价粒径小于19mm的有粘性材料的强度。
1.2When materials having maximum particle sizes greater than 19 mm (3/4 in.) are to be tested, this
test method provides for modifying the gradation of the material so that the material ud for tests
all pass the 19.0-mm (3/4-in.) sieve while the total gravel 4.75-mm (No. 4) to 75-mm (3-in.)
fraction remains the same. While traditionally this method of specimen preparation has been ud
to avoid the error inherent in testing materials containing large particles in the CBR test apparatus,
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the modified material may have significantly different strength properties than the original
material. However, a large experience ba has developed using this test method for materials for
大鱼海棠经典台词which the gradation has been modified and satisfactory design methods are in u bad on the
results of tests using this procedure.
当试验当中有最大粒径大于19mm的材料时，这种测试方法提供了修改的材料级配，以便进行测试所使用的材料都通过了19.0毫米筛然而4.75毫米至75毫米的总砾石部分保持不变。虽然这种传统的样品制备方法已经避免了含有大颗粒时的CBR试验的错误，但修改后的材料可能比原始材料显着不同的强度特性,然而，一个大量的实践基础形成时，在使用这种试验方法时材料的级配被修改和令人满意的设计方法被使用基于这种程序的试验结果。
1.3Past practice has shown that CBR results for tho materials having substantial percentages of
particles retained on the 4.75-mm (No. 4) sieve are more variable than for finer materials.
Conquently, more trials may be required for the materials to establish a reliable CBR.
过去的实践表明，对于那些因对4.75毫米（第4号）筛保留相当比例的颗粒材料CBR的结果比细的材料更可变，因此，更多的试验可能需要这些材料，建立一个可靠的CBR
1.4This test method provides for the determination of the CBR of a material at optimum water
content or a range of water content from a specified compaction test and a specified dry unit mass.
The dry unit mass is usually given as a percentage of maximum dry unit mass from the
compaction tests of T 99 or T 180.
这种测试方法在最佳含水量或一个阶段的含水量提供了CBR的确定，从指定的击实试验和
指定的单位干质量，单位干质量通常是给出一个最大单位干质量的百分比 从T99或者T180
1.5The agency requesting the test shall specify the water content or range of water content and the
dry unit mass for which the CBR is desired.
这个机构要求的方法应该是CBR要求的 指定含水量或者含水量的范围。
1.6Unless specified otherwi by the requesting agency, or unless it has been shown to have no effect
on test results for the material being tested, all specimens shall be soaked prior to penetration.
除另有规定外机构的要求，或除非这种材料试验的结果证明没有效果，所有的试件在贯入前应该浸泡
1.7 The values stated in SI units are to be regarded as the standard.
在SI单位表示的值将被视为为标准
2.参考文件
2.1 AASHTO 标准:
M 92,
M 145
T 2
毕业生登记表班级鉴定
T 87
黑附子 T 88
T 89
T 90
T 99
T 180
T 265
3. SIGNIFICANCE AND USE意义和使用
3.1This test method is ud to evaluate the potential strength of subgrade, subba, and ba cour
material, including recycled materials, for u in road and airfield pavements. The CBR value
obtained in this test forms an integral part of veral flexible pavement design methods.
这种测试方法用于评价路基，底基层潜在的能量，与基层材料，包括再生材料，道路和机场路面使用，CBR值的形式在这个测试中取得了一些柔性路面设计方法的组成部分
3.2For applications where the effect of compaction water content on CBR is small, such as
cohesionless, coar-grained materials, or where an allowance is made for the effect of differing
compaction water contents in the design procedure, the CBR may be determined at the optimum
water content of a specified compaction effort. The dry unit mass specified is normally the
minimum percent compaction allowed by using the agency’s field compaction specification.
对于应用中的压实含水量对CBR的影响较小,如无粘性，粗晶材料, 或者在设计过程中，一个限额使用在不同压实含水量的影响， CBR的确定在一个指定的压实最佳含水量的成就，指定的单位质干质量通常是用机构现场压实规范允许的最低压实百分比。
3.3For applications where the effect of compaction water content on CBR is unknown or where it is
desired to account for its effect, the CBR is determined for a range of water content, usually the
红色经典影片黄仁勋range of water content permitted for field compaction by using the agency’s field compaction
specification.
对于应用中的压实含水量对CBR的影响是未知的或者是需要考虑到其效果，CBR被确定在一个含水量范围，通常为外地压实允许的含水量范围介绍一下自己，采用该机构的现场压实规范
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