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Fields for table: INV_UNBOUND

Field NameCodesData TypeUnitsTest ProtocolDescription
SHRP_ID

VARCHAR2(4)


Test section identification number assigned by LTPP program. Must be combined with STATE_CODE to be unique.
OPTIMUM_LAB_MOISTURE

NUMBER(3,1)
%

Optimum moisture content of unbound material.
MAX_DRY_DENSITY_TEST
MAX_DRY_DENSITY_TESTNUMBER(1)


Code for test method used to establish the max dry density and optimum moisture content.
MAX_DRY_DENSITY_TEST_OTHER

VARCHAR2(40)


Test method used to establish the max dry density and optimum moisture content if other than those specified.
COMPACTIVE_ENERGY

NUMBER(3,1)
ft-lbs/cu in

Compactive energy applied in test.
IN_SITU_DRY_DEN_MEAN

NUMBER(3)
pcf

Average in situ dry density.
IN_SITU_DRY_DEN_MIN

NUMBER(3)
pcf

Minimum in situ dry density.
IN_SITU_DRY_DEN_MAX

NUMBER(3)
pcf

Maximum in situ dry density.
NO_SAMP_IN_SITU_DRY_DEN

NUMBER(3)


Number of measurements taken for in situ dry density.
IN_SITU_DRY_DEN_STD_DEV

NUMBER(3)
pcf

Standard deviation of in situ dry density.
IN_SITU_MOISTURE_MEAN

NUMBER(3)
%

Average in situ moisture content as a percent of dry weight.
STATE_CODE
STATE_PROVINCENUMBER(2)


Numerical code for state or province. U.S. codes are consistent with Federal Information Processing Standards.
IN_SITU_MOISTURE_MIN

NUMBER(3)
%

Minimum in situ moisture content as a percent of dry weight.
IN_SITU_MOISTURE_MAX

NUMBER(3)
%

Maximum in situ moisture content as a percent of dry weight.
NO_SAMP_IN_SITU_MOISTURE

NUMBER(3)


Number of measurements taken for in situ moisture content as a percent of dry weight.
IN_SITU_MOISTURE_STD_DEV

NUMBER(3)
%

Standard deviation of in situ moisture content as a percent of dry weight.
COMP_STRENGTH_MEAN

NUMBER(5)
psi

Mean compressive strength.
COMP_STRENGTH_MIN

NUMBER(5)
psi

Minimum compressive strength.
COMP_STRENGTH_MAX

NUMBER(5)
psi

Maximum compressive strength.
NO_COMP_STRENGTH_TESTS

NUMBER(3)


Number of compressive strength tests performed.
COMP_STRENGTH_STD_DEV

NUMBER(6,1)
psi

Standard deviation of the compressive strength tests.
COMP_TEST_TYPE
COMP_TEST_TYPENUMBER(1)


Code indicating type of compression test.
CONSTRUCTION_NO

NUMBER(2)


Event number used to relate changes in pavement structure with other time dependent data elements. This field is set to 1 when a test section is initially accepted into LTPP and is incremented with each change to the layer structure.
COMP_TEST_TYPE_OTHER

VARCHAR2(40)


Type of compression test if other than those specified.
CONFINING_PRESSURE

NUMBER(3,1)
psi

Confining pressure applied during compressive strength test.
CALCIUM_CARBONATE_CONTENT

NUMBER(3)
%

Calcium carbonate content.
CALIFORNIA_BEARING_RATIO

NUMBER(3)
%

Mean California bearing ratio.
RESISTANCE

NUMBER(3)
%

Mean resistance (r-value).
MODULUS_SUBGRADE_REACTION

NUMBER(3)
pci

Modulus of subgrade reaction (k-value).
TEST_TYPE
TEST_TYPENUMBER(1)


Code indicating what type of k-value test was used.
RECORD_STATUS

VARCHAR2(1)


A code indicating the general quality of the data.
LAYER_NO

NUMBER(2)


Unique sequential number assigned to pavement layers, starting with layer 1 as the deepest layer (subgrade).
AASHTO_SOIL_CLASS
AASHTO_SOIL_CLASSNUMBER(2)


Code for AASHTO soil classification for subgrade material.
PLASTICITY_INDEX

NUMBER(2)
%

Plasticity index.
LIQUID_LIMIT

NUMBER(2)
%

Liquid limit determined by AASHTO T90 and T89 or ASTM D4318.
PLASTIC_LIMIT

NUMBER(2)
%

Plastic limit.
MAX_LAB_DRY_DENSITY

NUMBER(3)
pcf

Maximum laboratory dry density of the sample.