Download Aashto T-193 Standard Method of Test for the California Bearing Ratio PDF

TitleAashto T-193 Standard Method of Test for the California Bearing Ratio
File Size1.5 MB
Total Pages11
Table of Contents
                            SCOPE
REFERENCED DOCUMENTS
SIGNIFICANCE AND USE
APPARATUS
SAMPLE
MOISTURE-DENSITY RELATION
PROCEDURE
SOAKING
PENETRATION TEST
CALCULATIONS
REPORT
                        
Document Text Contents
Page 1

Standard Method of Test for

The California Bearing Ratio

AASHTO Designation: T 193-99 (2003)

1. SCOPE

1.1. This test method covers the determination of the California Bearing Ratio (CBR) of p
subgrade, subbase, and base/course materials from laboratory compacted specimens.
method is primarily intended for but not limited to, evaluating the strength of cohesiv
having maximum particle sizes less than 19 mm (3/4 in.).

1.2. When materials having maximum particle sizes greater than 19 mm (3/4 in.) are to be
test method provides for modifying the gradation of the material so that the material
all passes the 19.0-mm (3/4-in.) sieve while the total gravel 4.75-mm (No. 4) to 75-m
fraction remains the same. While traditionally this method of specimen preparation h
to avoid the error inherent in testing materials containing large particles in the CBR t
the modified material may have significantly different strength properties than the or
material. However, a large experience base has developed using this test method for
which the gradation has been modified, and satisfactory design methods are in use ba
results of tests using this procedure.

1.3. Past practice has shown that CBR results for those materials having substantial perce
particles retained on the 4.75-mm (No. 4) sieve are more variable than for finer mate
Consequently, more trials may be required for these materials to establish a reliable C

1.4. This test method provides for the determination of the CBR of a material at optimum
content or a range of water content from a specified compaction test and a specified d
The dry unit mass is usually given as a percentage of maximum dry unit mass from t
compaction tests of T 99 or T 180.

1.5. The agency requesting the test shall specify the water content or range of water conte
dry unit mass for which the CBR is desired.

1.6. Unless specified otherwise by the requesting agency, or unless it has been shown to h
on test results for the material being tested, all specimens shall be soaked prior to pen

1.7. The values stated in SI units are to be regarded as the standard.

2. REFERENCED DOCUMENTS

2.1. AASHTO Standards:
M 92, Wire-Cloth Sieves for Testing Purposes
M 145, Classification of Soils and Soil-Aggregate Mixtures for Highway Constr

Purposes
T 2, Sampling of Aggregates
T 87, Dry Preparation of Disturbed Soil and Soil Aggregate Samples for Test

TS-1a T 193-1
avement
The test
e materials

tested, this
used for tests
m (3-in.)
as been used
est apparatus,
iginal
materials for
sed on the

ntages of
rials.
BR.

water
ry unit mass.

he

nt and the

ave no effect
etration.

uction

AASHTO

PLittle
Line

Similer Documents