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Publication Number: FHWA-HRT-15-036 Date: December 2015

Publication Number: FHWA-HRT-15-036
Date: December 2015

Long-Term Pavement Performance Program Determination of In-Place Elastic Layer Modulus: Backcalculation Methodology and Procedures

Appendix C: Development of the Simulated Layer Structure for the Backcalculation Process Using Evercalc^© and Modcomp^©

This appendix includes the tables used for developing the simulated pavement structure for the first segment analysis using EVERCALC^©. Chapter 4 provided the rules of simulation used to create or combine different layers in the pavement structure for the initial two phases of analysis, while this appendix presents the layering information. The appendix is divided into two parts: the first part shows results for the simulated structure with a bedrock or apparent rigid layer (table 21 to table 29), and the second part shows the results for the condition or simulation without a bedrock layer (table 30 to table 42). Each section includes a series of generic tables for specific layer combination.

BACKCALCULATION STRUCTURE FOR CASES USING BEDROCK IN THE BACKCALCULATION STRUCTURE

Table 21. AC surface with two layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	SS_TYPE	BC_LAYER_ 2_ DESIG	BC_LAYER_ 3_ DESIG	BC_LAYER_ SS_ DESIG	BEDROCK_ LAYER_NO
GB_COARSE	GS_COARSE	SS_COARSE	2	2	3	4
GB_COARSE	GS_FINE	SS_COARSE	2	2	3	4
GB_COARSE	GS_SAND	SS_COARSE	2	2	3	4
GB_COARSE	GS_TYP	SS_COARSE	2	2	3	4
GB_COARSE	TS_LIME	SS_COARSE	2	3	4	5
GB_COARSE	TS_STAB	SS_COARSE	2	3	4	5
GB_FINE	GS_SAND	SS_COARSE	2	2	3	4
GB_SAND	GS_SAND	SS_COARSE	2	2	3	4
GB_TYP	GS_COARSE	SS_COARSE	2	2	3	4
GB_TYP	GS_FINE	SS_COARSE	2	2	3	4
GB_TYP	GS_SAND	SS_COARSE	2	2	3	4
GB_TYP	GS_TYP	SS_COARSE	2	2	3	4
GB_TYP	TB_AC	SS_COARSE	2	3	4	5
GB_TYP	TS_AC	SS_COARSE	2	3	4	5
GB_TYP	TS_LIME	SS_COARSE	2	3	4	5
GB_TYP	TS_STAB	SS_COARSE	2	3	4	5
PC	GB_COARSE	SS_COARSE	2	3	4	5
PC	GB_SAND	SS_COARSE	2	3	4	5
PC	GB_TYP	SS_COARSE	2	3	4	5
PC	TB_AC	SS_COARSE	2	3	4	5
PC	TB_LCB	SS_COARSE	2	3	4	5
PC	TB_STAB	SS_COARSE	2	3	4	5
PC_RUBBLIZED	GB_TYP	SS_COARSE	2	3	4	5
PCC_CRACKED	GB_COARSE	SS_COARSE	2	3	4	5
PCC_CRACKED	GB_TYP	SS_COARSE	2	3	4	5
PCC_CRACKED	GS_COARSE	SS_COARSE	2	3	4	5
PCC_CRACKED	TB_STAB	SS_COARSE	2	3	4	5
TB_AC	GB_TYP	SS_COARSE	2	3	4	5
TB_AC	GS_COARSE	SS_COARSE	2	3	4	5
TB_AC	GS_FINE	SS_COARSE	2	3	4	5
TB_AC	GS_SAND	SS_COARSE	2	3	4	5
TB_AC	GS_TYP	SS_COARSE	2	3	4	5
TB_AC	TB_AC	SS_COARSE	2	2	3	4
TB_AC	TS_LIME	SS_COARSE	2	3	4	5
TB_AC	TS_STAB	SS_COARSE	2	3	4	5
TB_LCB	GS_COARSE	SS_COARSE	2	3	4	5
TB_LCB	GS_TYP	SS_COARSE	2	3	4	5
TB_STAB	GS_COARSE	SS_COARSE	2	3	4	5
TB_STAB	GS_FINE	SS_COARSE	2	3	4	5
TB_STAB	GS_TYP	SS_COARSE	2	3	4	5
TB_STAB	TS_LIME	SS_COARSE	2	3	4	5
GB_COARSE	GS_COARSE	SS_FINE	2	2	3	4
GB_COARSE	GS_FINE	SS_FINE	2	2	3	4
GB_COARSE	TS_LIME	SS_FINE	2	3	4	5
GB_COARSE	TS_STAB	SS_FINE	2	3	4	5
GB_FINE	TS_LIME	SS_FINE	2	3	4	5
GB_SAND	GS_SAND	SS_FINE	2	2	3	4
GB_TYP	GS_COARSE	SS_FINE	2	2	3	4
GB_TYP	GS_FINE	SS_FINE	2	2	3	4
GB_TYP	GS_LIME	SS_FINE	2	2	3	4
GB_TYP	GS_SAND	SS_FINE	2	2	3	4
GB_TYP	GS_TYP	SS_FINE	2	2	3	4
GB_TYP	TS_LIME	SS_FINE	2	3	4	5
GB_TYP	TS_STAB	SS_FINE	2	3	4	5
PC	GB_FINE	SS_FINE	2	3	4	5
PC	GB_SAND	SS_FINE	2	3	4	5
PC	GB_TYP	SS_FINE	2	3	4	5
PC	TB_AC	SS_FINE	2	3	4	5
PC	TB_CEMENT	SS_FINE	2	3	4	5
PC	TB_LCB	SS_FINE	2	3	4	5
PC	TB_LIME	SS_FINE	2	3	4	5
PC	TB_STAB	SS_FINE	2	3	4	5
PC_RUBBLIZED	GB_TYP	SS_FINE	2	3	4	5
PCC_CRACKED	GB_FINE	SS_FINE	2	3	4	5
PCC_CRACKED	GB_TYP	SS_FINE	2	3	4	5
PCC_CRACKED	TB_AC	SS_FINE	2	3	4	5
PCC_CRACKED	TB_CEMENT	SS_FINE	2	3	4	5
PCC_CRACKED	TB_STAB	SS_FINE	2	3	4	5
TB_AC	GB_TYP	SS_FINE	2	3	4	5
TB_AC	GS_COARSE	SS_FINE	2	3	4	5
TB_AC	GS_FINE	SS_FINE	2	3	4	5
TB_AC	GS_TYP	SS_FINE	2	3	4	5
TB_AC	TB_AC	SS_FINE	2	2	3	4
TB_AC	TS_LIME	SS_FINE	2	3	4	5
TB_AC	TS_STAB	SS_FINE	2	3	4	5
TB_CEMENT	TS_LIME	SS_FINE	2	3	4	5
TB_LCB	GS_COARSE	SS_FINE	2	3	4	5
TB_LCB	GS_FINE	SS_FINE	2	3	4	5
TB_LCB	GS_TYP	SS_FINE	2	3	4	5
TB_STAB	GS_COARSE	SS_FINE	2	3	4	5
TB_STAB	GS_FINE	SS_FINE	2	3	4	5
TB_STAB	GS_TYP	SS_FINE	2	3	4	5
TB_STAB	TS_LIME	SS_FINE	2	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 22. PCC surface with two layers between PCC and subgrade.
LAYER_ AFTER_PC_1	LAYER_ AFTER_PC_2	SS_TYPE	BC_LAYER_ 2_DESIG	BC_LAYER_ 3_DESIG	BC_LAYER_ SS_DESIG	BEDROCK_ LAYER_NO
AC	TB_CEMENT	SS_COARSE	2	3	4	5
AC	TB_STAB	SS_COARSE	2	3	4	5
GB_COARSE	GS_COARSE	SS_COARSE	2	2	3	4
GB_COARSE	GS_FINE	SS_COARSE	2	3	4	5
GB_COARSE	GS_SAND	SS_COARSE	2	3	4	5
GB_TYP	GS_COARSE	SS_COARSE	2	3	4	5
GB_TYP	GS_FINE	SS_COARSE	2	3	4	5
GB_TYP	GS_SAND	SS_COARSE	2	3	4	5
GB_TYP	GS_TYP	SS_COARSE	2	2	3	4
TB_AC	GB_COARSE	SS_COARSE	2	3	4	5
TB_AC	GB_TYP	SS_COARSE	2	3	4	5
TB_AC	GS_COARSE	SS_COARSE	2	3	4	5
TB_AC	GS_FINE	SS_COARSE	2	3	4	5
TB_AC	GS_SAND	SS_COARSE	2	3	4	5
TB_AC	GS_TYP	SS_COARSE	2	3	4	5
TB_AC	TS_AC	SS_COARSE	2	2	3	4
TB_AC	TS_LIME	SS_COARSE	2	3	4	5
TB_AC	TS_STAB	SS_COARSE	2	3	4	5
TB_CEMENT	GS_FINE	SS_COARSE	2	3	4	5
TB_LCB	GB_TYP	SS_COARSE	2	3	4	5
TB_LCB	GS_COARSE	SS_COARSE	2	3	4	5
TB_LCB	GS_TYP	SS_COARSE	2	3	4	5
TB_STAB	GS_COARSE	SS_COARSE	2	3	4	5
TB_STAB	GS_FINE	SS_COARSE	2	3	4	5
TB_STAB	GS_SAND	SS_COARSE	2	3	4	5
TB_STAB	GS_TYP	SS_COARSE	2	3	4	5
AC	PC	SS_FINE	2	3	4	5
AC	TB_STAB	SS_FINE	2	3	4	5
GB_COARSE	GS_COARSE	SS_FINE	2	2	3	4
GB_FINE	GS_COARSE	SS_FINE	2	2	3	4
GB_FINE	GS_SAND	SS_FINE	2	3	4	5
GB_TYP	GS_COARSE	SS_FINE	2	2	3	4
GB_TYP	GS_FINE	SS_FINE	2	3	4	5
GB_TYP	GS_SAND	SS_FINE	2	3	4	5
GB_TYP	GS_TYP	SS_FINE	2	2	3	4
GB_TYP	TS_LIME	SS_FINE	2	3	4	5
GB_TYP	TS_STAB	SS_FINE	2	3	4	5
TB_AC	GB_TYP	SS_FINE	2	3	4	5
TB_AC	GS_COARSE	SS_FINE	2	3	4	5
TB_AC	GS_FINE	SS_FINE	2	3	4	5
TB_AC	GS_TYP	SS_FINE	2	3	4	5
TB_AC	TS_LIME	SS_FINE	2	3	4	5
TB_CEMENT	GS_FINE	SS_FINE	2	3	4	5
TB_CEMENT	TS_LIME	SS_FINE	2	3	4	5
TB_LCB	GS_COARSE	SS_FINE	2	3	4	5
TB_LCB	GS_FINE	SS_FINE	2	3	4	5
TB_LCB	GS_SAND	SS_FINE	2	3	4	5
TB_LCB	TS_LIME	SS_FINE	2	3	4	5
TB_LCB	TS_STAB	SS_FINE	2	3	4	5
TB_STAB	GB_TYP	SS_FINE	2	3	4	5
TB_STAB	GS_COARSE	SS_FINE	2	3	4	5
TB_STAB	GS_FINE	SS_FINE	2	3	4	5
TB_STAB	TS_LIME	SS_FINE	2	3	4	5
TB_STAB	TS_STAB	SS_FINE	2	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 23. AC surface with three layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_ NO
GB_COARSE	GS_COARSE	TS_AC	SS_COARSE	2	2	3	4	5
GB_COARSE	GS_SAND	TS_AC	SS_COARSE	2	2	3	4	5
GB_TYP	AC	GS_TYP	SS_COARSE	2	2	2	3	4
GB_TYP	GB_TYP	TS_LIME	SS_COARSE	2	2	3	4	5
GB_TYP	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	5
GB_TYP	GS_COARSE	TS_LIME	SS_COARSE	2	2	3	4	5
GB_TYP	GS_TYP	GS_COARSE	SS_COARSE	2	2	3	4	5
GB_TYP	GS_TYP	GS_SAND	SS_COARSE	2	2	3	4	5
GB_TYP	GS_TYP	GS_TYP	SS_COARSE	2	2	3	4	5
PC	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
PC	GB_TYP	GS_FINE	SS_COARSE	2	3	3	4	5
PC	GB_TYP	GS_SAND	SS_COARSE	2	3	3	4	5
PC	GB_TYP	GS_TYP	SS_COARSE	2	3	3	4	5
PC	TB_AC	GS_COARSE	SS_COARSE	2	3	3	4	5
PC	TB_AC	GS_FINE	SS_COARSE	2	3	3	4	5
PC	TB_AC	GS_TYP	SS_COARSE	2	3	3	4	5
PC	TB_AC	TS_LIME	SS_COARSE	2	3	3	4	5
PC	TB_LCB	GS_TYP	SS_COARSE	2	2	3	4	5
PC	TB_STAB	GS_COARSE	SS_COARSE	2	3	3	4	5
PC	TB_STAB	GS_SAND	SS_COARSE	2	3	3	4	5
PC	TB_STAB	GS_TYP	SS_COARSE	2	3	3	4	5
PC_RUBBLIZED	TB_STAB	GS_TYP	SS_COARSE	2	2	3	4	5
PCC_CRACKED	TB_STAB	GS_COARSE	SS_COARSE	2	2	3	4	5
PCC_CRACKED	TB_STAB	GS_TYP	SS_COARSE	2	2	3	4	5
TB_AC	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_AC	GB_TYP	GS_FINE	SS_COARSE	2	3	3	4	5
TB_AC	GB_TYP	GS_TYP	SS_COARSE	2	3	3	4	5
TB_AC	GB_TYP	TS_LIME	SS_COARSE	2	3	3	4	5
TB_AC	GB_TYP	TS_STAB	SS_COARSE	2	3	3	4	5
TB_AC	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_AC	GS_COARSE	GS_SAND	SS_COARSE	2	3	3	4	5
TB_AC	GS_COARSE	TS_LIME	SS_COARSE	2	3	3	4	5
TB_AC	GS_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_AC	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5
TB_AC	GS_TYP	TS_STAB	SS_COARSE	2	3	3	4	5
TB_AC	TB_AC	GS_COARSE	SS_COARSE	2	2	3	4	5
TB_AC	TB_AC	GS_TYP	SS_COARSE	2	2	3	4	5
TB_AC	TB_AC	TS_LIME	SS_COARSE	2	2	3	4	5
TB_AC	TB_AC	TS_STAB	SS_COARSE	2	2	3	4	5
TB_AC	TB_STAB	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_AC	TS_AC	GS_COARSE	SS_COARSE	2	2	3	4	5
TB_STAB	GS_FINE	GS_COARSE	SS_COARSE	2	3	3	4	5
GB_SAND	GS_TYP	GS_TYP	SS_FINE	2	3	3	4	5
GB_TYP	GS_COARSE	GS_FINE	SS_FINE	2	2	3	4	5
GB_TYP	GS_COARSE	TS_STAB	SS_FINE	2	2	3	4	5
GB_TYP	GS_SAND	GS_FINE	SS_FINE	2	3	3	4	5
GB_TYP	GS_TYP	GS_TYP	SS_FINE	2	2	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 24. PCC surface with three layers between PCC and subgrade.
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_NO
AC	AC	GB_TYP	SS_COARSE	2	2	3	4	5
AC	AC	PC	SS_COARSE	2	2	3	4	5
AC	PC	GB_TYP	SS_COARSE	2	2	3	4	5
AC	TB_STAB	GS_COARSE	SS_COARSE	2	2	3	4	5
GB_TYP	GB_TYP	GS_COARSE	SS_COARSE	2	2	3	4	5
GB_TYP	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	5
GB_TYP	GS_COARSE	GS_FINE	SS_COARSE	2	2	3	4	5
GB_TYP	GS_COARSE	TS_LIME	SS_COARSE	2	2	3	4	5
GB_TYP	GS_FINE	GS_FINE	SS_COARSE	2	3	3	4	5
TB_AC	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_AC	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_AC	GS_COARSE	TS_LIME	SS_COARSE	2	3	3	4	5
TB_AC	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5
TB_AC	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_CEMENT	GS_FINE	TS_LIME	SS_COARSE	2	3	3	4	5
TB_LCB	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_LCB	GS_COARSE	TS_LIME	SS_COARSE	2	3	3	4	5
TB_LCB	GS_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_STAB	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_STAB	GS_FINE	TS_LIME	SS_COARSE	2	3	3	4	5
TB_STAB	GS_TYP	GS_COARSE	SS_COARSE	2	3	3	4	5
TB_STAB	GS_TYP	GS_FINE	SS_COARSE	2	3	3	4	5
TB_STAB	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5
TB_STAB	TS_STAB	GS_COARSE	SS_COARSE	2	2	3	4	5
AC	AC	PC	SS_FINE	2	2	3	4	5
AC	PC	GB_FINE	SS_FINE	2	2	3	4	5
AC	PC	GB_SAND	SS_FINE	2	2	3	4	5
AC	PC	GB_TYP	SS_FINE	2	2	3	4	5
AC	PC	TB_CEMENT	SS_FINE	2	2	3	4	5
AC	PC	TB_STAB	SS_FINE	2	2	3	4	5
AC	TB_STAB	TS_LIME	SS_FINE	2	3	3	4	5
GB_TYP	GS_COARSE	TS_LIME	SS_FINE	2	3	3	4	5
GB_TYP	GS_FINE	GS_TYP	SS_FINE	2	3	3	4	5
TB_AC	AC	GS_COARSE	SS_FINE	2	2	3	4	5
TB_AC	AC	GS_SAND	SS_FINE	2	2	3	4	5
TB_AC	AC	TS_LIME	SS_FINE	2	2	3	4	5
TB_AC	GB_TYP	GS_FINE	SS_FINE	2	3	3	4	5
TB_AC	GB_TYP	TS_LIME	SS_FINE	2	3	3	4	5
TB_AC	GB_TYP	TS_STAB	SS_FINE	2	3	3	4	5
TB_AC	TS_AC	TS_LIME	SS_FINE	2	2	3	4	5
TB_AC	TS_LIME	GS_FINE	SS_FINE	2	2	3	4	5
TB_CEMENT	GS_SAND	TS_LIME	SS_FINE	2	3	3	4	5
TB_LCB	GS_COARSE	TS_LIME	SS_FINE	2	3	3	4	5
TB_LCB	GS_FINE	GS_TYP	SS_FINE	2	3	3	4	5
TB_STAB	GS_COARSE	TS_LIME	SS_FINE	2	3	3	4	5
TB_STAB	GS_TYP	GS_COARSE	SS_FINE	2	3	3	4	5
TB_STAB	GS_TYP	GS_FINE	SS_FINE	2	3	3	4	5
TB_STAB	TS_STAB	GS_COARSE	SS_FINE	2	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 25. AC surface with four layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	LAYER_ AFTER_ AC_4	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_ NO
PC	AC	PC	GB_TYP	SS_COARSE	2	2	2	3	4	5
PC	GB_TYP	GS_FINE	GS_FINE	SS_COARSE	2	3	3	3	4	5
PC	TB_AC	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	3	4	5
PC	TB_CEMENT	GS_FINE	TS_LIME	SS_COARSE	2	3	3	3	4	5
PC	TB_STAB	GS_FINE	TS_LIME	SS_COARSE	2	3	3	3	4	5
PC	TB_STAB	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	3	4	5
PCC_ CRACKED	TB_STAB	GS_TYP	GS_FINE	SS_COARSE	2	3	3	3	4	5
TB_AC	GB_TYP	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	3	4	5
TB_AC	GB_TYP	GS_COARSE	TS_LIME	SS_COARSE	2	3	3	3	4	5
TB_AC	GB_TYP	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	3	4	5
TB_AC	GS_TYP	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	3	4	5
TB_AC	TB_AC	GB_TYP	GS_COARSE	SS_COARSE	2	2	3	3	4	5
TB_AC	TB_AC	GS_COARSE	TS_LIME	SS_COARSE	2	2	3	3	4	5
GB_TYP	TS_AC	GS_TYP	GS_TYP	SS_FINE	2	2	3	3	4	5
PC	TB_CEMENT	GS_COARSE	TS_LIME	SS_FINE	2	2	3	3	4	5
PC	TB_CEMENT	GS_SAND	TS_LIME	SS_FINE	2	3	3	3	4	5
PC	TB_STAB	GS_COARSE	TS_LIME	SS_FINE	2	3	3	3	4	5
PC	TB_STAB	GS_TYP	GS_COARSE	SS_FINE	2	3	3	3	4	5
PC	TB_STAB	TS_STAB	GS_COARSE	SS_FINE	2	3	3	3	4	5
PCC_ CRACKED	TB_STAB	GS_TYP	GS_FINE	SS_FINE	2	3	3	3	4	5
TB_AC	GB_TYP	TS_STAB	GS_COARSE	SS_FINE	2	3	3	3	4	5
TB_AC	GB_TYP	TS_STAB	GS_FINE	SS_FINE	2	3	3	3	4	5
TB_AC	TB_AC	GB_TYP	TS_STAB	SS_FINE	2	2	3	3	4	5
TB_AC	TB_AC	TS_STAB	GS_FINE	SS_FINE	2	2	3	3	4	5
TB_AC	TS_AC	GS_TYP	GS_FINE	SS_FINE	2	2	3	3	4	5
TB_LCB	TB_STAB	TS_STAB	TS_STAB	SS_FINE	2	3	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 26. PCC surface with four layers between PCC and subgrade.
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	LAYER_ AFTER_ PC_4	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_ NO
AC	AC	PC	GB_TYP	SS_COARSE	2	2	2	3	4	5
AC	PC	GB_TYP	GS_COARSE	SS_COARSE	2	2	3	3	4	5
AC	PC	GB_TYP	GS_SAND	SS_COARSE	2	2	3	3	4	5
AC	PC	TB_STAB	GS_COARSE	SS_COARSE	2	2	3	3	4	5
AC	PCC_ CRACKED	TB_STAB	GS_TYP	SS_COARSE	2	2	2	3	4	5
GB_ COARSE	GS_COARSE	GS_FINE	GS_FINE	SS_COARSE	2	2	3	3	4	5
TB_AC	GB_TYP	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	3	4	5
TB_LCB	GS_COARSE	GS_COARSE	GS_TYP	SS_COARSE	2	3	3	3	4	5
AC	AC	PC	GB_TYP	SS_FINE	2	2	2	3	4	5
AC	PC	GB_COARSE	TS_LIME	SS_FINE	2	2	3	3	4	5
AC	PC	GB_TYP	GS_COARSE	SS_FINE	2	2	3	3	4	5
AC	PC	GB_TYP	GS_SAND	SS_FINE	2	2	3	3	4	5
TB_AC	GB_TYP	GS_COARSE	TS_LIME	SS_FINE	2	3	3	3	4	5
TB_AC	GB_TYP	GS_FINE	GS_TYP	SS_FINE	2	3	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 27. AC surface with five layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	LAYER_ AFTER_ AC_4	LAYER_ AFTER_ AC_5	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_ NO
PC	GB_COARSE	GS_COARSE	GS_FINE	GS_FINE	SS_COARSE	2	3	3	3	3	4	5
TB_AC	AC	AC	AC	TS_STAB	SS_COARSE	1	1	1	1	2	3	4
GB_TYP	TS_AC	GS_TYP	GS_TYP	GS_TYP	SS_FINE	2	2	3	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 28. PCC surface with six layers between PCC and subgrade.
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	LAYER_ AFTER_ PC_4	LAYER_ AFTER_ PC_5	LAYER_ AFTER_ PC_6	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ 7_DESIG	BC_ LAYER_ SS_DESIG	BC_ LAYER_ NO
AC	AC	AC	PC	GB_COARSE	GS_TYP	SS_FINE	2	2	2	2	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 29. AC surface with seven layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	LAYER_ AFTER_ AC_4	LAYER_ AFTER_ AC_5	LAYER_ AFTER_ AC_6	LAYER_ AFTER_ AC_7	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ 7_DESIG	BC_ LAYER_ 8_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_ NO
GB_TYP	GS_TYP	GS_TYP	TS_AC	GS_TYP	GS_TYP	GS_TYP	SS_FINE	2	3	3	3	3	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 30. PCC surface with seven layers between PCC and subgrade.
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	LAYER_ AFTER_ PC_4	LAYER_ AFTER_ PC_5	LAYER_ AFTER_ PC_6	LAYER_ AFTER_ PC_7	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ 7_DESIG	BC_ LAYER_ 8_DESIG	BC_ LAYER_ SS_DESIG	BEDROCK_ LAYER_ NO
AC	AC	AC	AC	PC	TB_CEMENT	TS_LIME	SS_FINE	2	2	2	2	2	3	3	4	5
AC	AC	AC	AC	PC	TB_STAB	TS_LIME	SS_FINE	2	2	2	2	2	3	3	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

BACKCALCULATION STRUCTURE FOR CASES WITHOUT BEDROCK IN THE BACKCALCULATION STRUCTURE

Table 31. AC surface with one layer between AC and subgrade.
LAYER_ AFTER_ AC_1	SS_TYPE	BC_LAYER_ 2_ DESIG	BC_LAYER_ SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
GB_COARSE	SS_COARSE	2	2	3	1
GB_FINE	SS_COARSE	2	3	4	0
GB_SAND	SS_COARSE	2	3	4	0
GB_TYP	SS_COARSE	2	3	4	0
GS_COARSE	SS_COARSE	2	2	3	1
PC	SS_COARSE	2	3	4	0
TB_AC	SS_COARSE	2	3	4	0
TB_CEMENT	SS_COARSE	2	3	4	0
TB_STAB	SS_COARSE	2	3	4	0
GB_COARSE	SS_FINE	2	3	4	0
GB_FINE	SS_FINE	2	2	3	1
GB_SAND	SS_FINE	2	3	4	0
GB_TYP	SS_FINE	2	3	4	0
PC	SS_FINE	2	3	4	0
TB_AC	SS_FINE	2	3	4	0
TB_CEMENT	SS_FINE	2	3	4	0
TB_LCB	SS_FINE	2	3	4	0
TB_LIME	SS_FINE	2	3	4	0
TB_STAB	SS_FINE	2	3	4	0
TS_AC	SS_FINE	2	3	4	0
TS_LIME	SS_FINE	2	3	4	0
TS_STAB	SS_FINE	2	3	4	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 32. PCC surface with one layer between PCC and subgrade.
LAYER_ AFTER_ PC_1	SS_TYPE	BC_LAYER_ 2_ DESIG	BC_LAYER_ SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
GB_COARSE	SS_COARSE	2	2	3	1
GB_FINE	SS_COARSE	2	3	4	0
GB_SAND	SS_COARSE	2	3	4	0
GB_TYP	SS_COARSE	2	3	4	0
GS_COARSE	SS_COARSE	2	2	3	1
TB_AC	SS_COARSE	2	3	4	0
TB_CEMENT	SS_COARSE	2	3	4	0
TB_LCB	SS_COARSE	2	3	4	0
TB_STAB	SS_COARSE	2	3	4	0
GB_COARSE	SS_FINE	2	3	4	0
GB_FINE	SS_FINE	2	2	3	1
GB_SAND	SS_FINE	2	3	4	0
GB_TYP	SS_FINE	2	3	4	0
TB_AC	SS_FINE	2	3	4	0
TB_CEMENT	SS_FINE	2	3	4	0
TB_LCB	SS_FINE	2	3	4	0
TB_STAB	SS_FINE	2	3	4	0
TB_STAB	SS_FINE	2	3	4	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 33. AC surface with two layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_AC_2	SS_TYPE	BC_LAYER_ 2_ DESIG	BC_LAYER_ 3_ DESIG	BC_LAYER_ SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
PC	TB_AC	SS_COARSE	2	3	4	5	0
PC	TB_LCB	SS_COARSE	2	3	4	5	0
PC	TB_STAB	SS_COARSE	2	3	4	5	0
PC_RUBBLIZED	GB_TYP	SS_COARSE	2	3	4	5	0
PCC_CRACKED	GB_COARSE	SS_COARSE	2	3	3	4	1
PCC_CRACKED	GB_TYP	SS_COARSE	2	3	4	5	0
PCC_CRACKED	GS_COARSE	SS_COARSE	2	3	3	4	1
PCC_CRACKED	TB_STAB	SS_COARSE	2	3	4	5	0
TB_AC	GB_TYP	SS_COARSE	2	3	4	5	0
TB_AC	GS_COARSE	SS_COARSE	2	3	3	4	1
TB_AC	GS_FINE	SS_COARSE	2	3	4	5	0
TB_AC	GS_SAND	SS_COARSE	2	3	4	5	0
TB_AC	GS_TYP	SS_COARSE	2	3	4	5	0
TB_AC	TB_AC	SS_COARSE	2	2	3	4	0
TB_AC	TS_LIME	SS_COARSE	2	3	3	4	0
TB_AC	TS_STAB	SS_COARSE	2	3	4	5	0
TB_LCB	GS_COARSE	SS_COARSE	2	3	3	4	1
TB_LCB	GS_TYP	SS_COARSE	2	3	4	5	0
TB_STAB	GS_COARSE	SS_COARSE	2	3	3	4	1
TB_STAB	GS_FINE	SS_COARSE	2	3	4	5	0
TB_STAB	GS_TYP	SS_COARSE	2	3	4	5	0
TB_STAB	TS_LIME	SS_COARSE	2	3	3	4	0
GB_COARSE	GS_COARSE	SS_FINE	2	2	3	4	0
GB_COARSE	GS_FINE	SS_FINE	2	3	3	4	1
GB_COARSE	TS_LIME	SS_FINE	2	3	3	4	0
GB_COARSE	TS_STAB	SS_FINE	2	3	4	5	0
GB_FINE	TS_LIME	SS_FINE	2	3	3	4	0
GB_SAND	GS_SAND	SS_FINE	2	2	3	4	0
GB_TYP	GS_COARSE	SS_FINE	2	3	4	5	0
GB_TYP	GS_FINE	SS_FINE	2	3	3	4	1
GB_TYP	GS_LIME	SS_FINE	2	3	3	4	0
GB_TYP	GS_SAND	SS_FINE	2	3	4	5	0
GB_TYP	GS_TYP	SS_FINE	2	2	3	4	0
GB_TYP	TS_LIME	SS_FINE	2	3	3	4	0
GB_TYP	TS_STAB	SS_FINE	2	3	4	5	0
PC	GB_FINE	SS_FINE	2	3	3	4	1
PC	GB_SAND	SS_FINE	2	3	4	5	0
PC	GB_TYP	SS_FINE	2	3	4	5	0
PC	TB_AC	SS_FINE	2	3	4	5	0
PC	TB_CEMENT	SS_FINE	2	3	4	5	0
PC	TB_LCB	SS_FINE	2	3	4	5	0
PC	TB_LIME	SS_FINE	2	3	3	4	0
PC	TB_STAB	SS_FINE	2	3	4	5	0
PC_RUBBLIZED	GB_TYP	SS_FINE	2	3	4	5	0
PCC_CRACKED	GB_FINE	SS_FINE	2	3	3	4	1
PCC_CRACKED	GB_TYP	SS_FINE	2	3	4	5	0
PCC_CRACKED	TB_AC	SS_FINE	2	3	4	5	0
PCC_CRACKED	TB_CEMENT	SS_FINE	2	3	4	5	0
PCC_CRACKED	TB_STAB	SS_FINE	2	3	4	5	0
TB_AC	GB_TYP	SS_FINE	2	3	4	5	0
TB_AC	GS_COARSE	SS_FINE	2	3	4	5	0
TB_AC	GS_FINE	SS_FINE	2	3	3	4	1
TB_AC	GS_TYP	SS_FINE	2	3	4	5	0
TB_AC	TB_AC	SS_FINE	2	2	3	4	0
TB_AC	TS_LIME	SS_FINE	2	3	3	4	0
TB_AC	TS_STAB	SS_FINE	2	3	4	5	0
TB_CEMENT	TS_LIME	SS_FINE	2	3	3	4	0
TB_LCB	GS_COARSE	SS_FINE	2	3	4	5	0
TB_LCB	GS_FINE	SS_FINE	2	3	3	4	1
TB_LCB	GS_TYP	SS_FINE	2	3	4	5	0
TB_STAB	GS_COARSE	SS_FINE	2	3	4	5	0
TB_STAB	GS_FINE	SS_FINE	2	3	3	4	1
TB_STAB	GS_TYP	SS_FINE	2	3	4	5	0
TB_STAB	TS_LIME	SS_FINE	2	3	3	4	0
GB_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	1
GB_COARSE	GS_FINE	SS_COARSE	2	3	4	5	0
GB_COARSE	GS_SAND	SS_COARSE	2	3	4	5	0
GB_COARSE	GS_TYP	SS_COARSE	2	3	4	5	0
GB_COARSE	TS_LIME	SS_COARSE	2	3	3	4	0
GB_COARSE	TS_STAB	SS_COARSE	2	3	4	5	0
GB_FINE	GS_SAND	SS_COARSE	2	3	4	5	0
GB_SAND	GS_SAND	SS_COARSE	2	2	3	4	0
GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	1
GB_TYP	GS_FINE	SS_COARSE	2	3	4	5	0
GB_TYP	GS_SAND	SS_COARSE	2	3	4	5	0
GB_TYP	GS_TYP	SS_COARSE	2	2	3	4	0
GB_TYP	TB_AC	SS_COARSE	2	3	4	5	0
GB_TYP	TS_AC	SS_COARSE	2	3	4	5	0
GB_TYP	TS_LIME	SS_COARSE	2	3	3	4	0
GB_TYP	TS_STAB	SS_COARSE	2	3	4	5	0
PC	GB_COARSE	SS_COARSE	2	3	3	4	1
PC	GB_SAND	SS_COARSE	2	3	4	5	0
PC	GB_TYP	SS_COARSE	2	3	4	5	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 34. PCC surface with two layers between PCC and subgrade.
LAYER_ AFTER_PC_1	LAYER_ AFTER_PC_2	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ SS_DESIG	BC_ LAYER_ NO	SS_ sub_ 24
AC	TB_CEMENT	SS_COARSE	2	3	4	5	0
AC	TB_STAB	SS_COARSE	2	3	4	5	0
GB_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	1
GB_COARSE	GS_FINE	SS_COARSE	2	3	4	5	0
GB_COARSE	GS_SAND	SS_COARSE	2	3	4	5	0
GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	1
GB_TYP	GS_FINE	SS_COARSE	2	3	4	5	0
GB_TYP	GS_SAND	SS_COARSE	2	3	4	5	0
GB_TYP	GS_TYP	SS_COARSE	2	2	3	4	0
TB_AC	GB_COARSE	SS_COARSE	2	3	3	4	1
TB_AC	GB_TYP	SS_COARSE	2	3	4	5	0
TB_AC	GS_COARSE	SS_COARSE	2	3	3	4	1
TB_AC	GS_FINE	SS_COARSE	2	3	4	5	0
TB_AC	GS_SAND	SS_COARSE	2	3	4	5	0
TB_AC	GS_TYP	SS_COARSE	2	3	4	5	0
TB_AC	TS_AC	SS_COARSE	2	2	3	4	0
TB_AC	TS_LIME	SS_COARSE	2	3	3	4	0
TB_AC	TS_STAB	SS_COARSE	2	3	4	5	0
TB_CEMENT	GS_FINE	SS_COARSE	2	3	4	5	0
TB_LCB	GB_TYP	SS_COARSE	2	3	4	5	0
TB_LCB	GS_COARSE	SS_COARSE	2	3	3	4	1
TB_LCB	GS_TYP	SS_COARSE	2	3	4	5	0
TB_STAB	GS_COARSE	SS_COARSE	2	3	3	4	1
TB_STAB	GS_FINE	SS_COARSE	2	3	4	5	0
TB_STAB	GS_SAND	SS_COARSE	2	3	4	5	0
TB_STAB	GS_TYP	SS_COARSE	2	3	4	5	0
AC	PC	SS_FINE	2	3	4	5	0
AC	TB_STAB	SS_FINE	2	3	4	5	0
GB_COARSE	GS_COARSE	SS_FINE	2	2	3	4	0
GB_FINE	GS_COARSE	SS_FINE	2	3	4	5	0
GB_FINE	GS_SAND	SS_FINE	2	3	4	5	0
GB_TYP	GS_COARSE	SS_FINE	2	3	4	5	0
GB_TYP	GS_FINE	SS_FINE	2	3	3	4	1
GB_TYP	GS_SAND	SS_FINE	2	3	4	5	0
GB_TYP	GS_TYP	SS_FINE	2	2	3	4	0
GB_TYP	TS_LIME	SS_FINE	2	3	3	4	0
GB_TYP	TS_STAB	SS_FINE	2	3	4	5	0
TB_AC	GB_TYP	SS_FINE	2	3	4	5	0
TB_AC	GS_COARSE	SS_FINE	2	3	4	5	0
TB_AC	GS_FINE	SS_FINE	2	3	3	4	1
TB_AC	GS_TYP	SS_FINE	2	3	4	5	0
TB_AC	TS_LIME	SS_FINE	2	3	3	4	0
TB_CEMENT	GS_FINE	SS_FINE	2	3	3	4	1
TB_CEMENT	TS_LIME	SS_FINE	2	3	3	4	0
TB_LCB	GS_COARSE	SS_FINE	2	3	4	5	0
TB_LCB	GS_FINE	SS_FINE	2	3	3	4	1
TB_LCB	GS_SAND	SS_FINE	2	3	4	5	0
TB_LCB	TS_LIME	SS_FINE	2	3	3	4	0
TB_LCB	TS_STAB	SS_FINE	2	3	4	5	0
TB_STAB	GB_TYP	SS_FINE	2	3	4	5	0
TB_STAB	GS_COARSE	SS_FINE	2	3	4	5	0
TB_STAB	GS_FINE	SS_FINE	2	3	3	4	1
TB_STAB	TS_LIME	SS_FINE	2	3	3	4	0
TB_STAB	TS_STAB	SS_FINE	2	3	4	5	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 35. AC surface with three layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_AC_2	LAYER_ AFTER_AC_3	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_LAYER_ 4_DESIG	BC_ LAYER_ SS_DESIG	BC_ LAYER_ NO	SS_ sub_ 24
PC	TB_LCB	GS_TYP	SS_COARSE	2	3	4	4	5	0
PC	TB_STAB	GS_COARSE	SS_COARSE	2	3	4	4	5	1
PC	TB_STAB	GS_SAND	SS_COARSE	2	3	4	4	5	0
PC	TB_STAB	GS_TYP	SS_COARSE	2	3	4	4	5	0
PC_RUBBLIZED	TB_STAB	GS_TYP	SS_COARSE	2	3	4	4	5	0
PCC_CRACKED	TB_STAB	GS_COARSE	SS_COARSE	2	3	4	4	5	1
PCC_CRACKED	TB_STAB	GS_TYP	SS_COARSE	2	3	4	4	5	0
TB_AC	GB_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_AC	GB_TYP	GS_FINE	SS_COARSE	2	3	4	4	5	0
TB_AC	GB_TYP	GS_TYP	SS_COARSE	2	3	3	4	5	0
TB_AC	GB_TYP	TS_LIME	SS_COARSE	2	3	4	4	5	0
TB_AC	GB_TYP	TS_STAB	SS_COARSE	2	3	4	4	5	0
TB_AC	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	4	1
TB_AC	GS_COARSE	GS_SAND	SS_COARSE	2	3	4	4	5	0
TB_AC	GS_COARSE	TS_LIME	SS_COARSE	2	3	4	4	5	0
TB_AC	GS_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_AC	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5	0
TB_AC	GS_TYP	TS_STAB	SS_COARSE	2	3	4	4	5	0
TB_AC	TB_AC	GS_COARSE	SS_COARSE	2	2	3	3	4	1
TB_AC	TB_AC	GS_TYP	SS_COARSE	2	2	3	4	5	0
TB_AC	TB_AC	TS_LIME	SS_COARSE	2	2	3	3	4	0
TB_AC	TB_AC	TS_STAB	SS_COARSE	2	2	3	4	5	0
TB_AC	TB_STAB	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_AC	TS_AC	GS_COARSE	SS_COARSE	2	2	3	3	4	1
TB_STAB	GS_FINE	GS_COARSE	SS_COARSE	2	3	4	4	5	1
GB_SAND	GS_TYP	GS_TYP	SS_FINE	2	3	3	4	5	0
GB_TYP	GS_COARSE	GS_FINE	SS_FINE	2	3	4	4	5	1
GB_TYP	GS_COARSE	TS_STAB	SS_FINE	2	2	3	4	5	0
GB_TYP	GS_SAND	GS_FINE	SS_FINE	2	3	4	4	5	1
GB_TYP	GS_TYP	GS_TYP	SS_FINE	2	3	3	4	5	0
GB_TYP	TS_STAB	GS_COARSE	SS_FINE	2	3	4	4	5	0
GB_TYP	TS_STAB	GS_FINE	SS_FINE	2	3	4	4	5	1
GB_TYP	TS_STAB	TS_LIME	SS_FINE	2	3	4	4	5	0
PC	GB_COARSE	GS_COARSE	SS_FINE	2	3	3	4	5	0
PC	GB_COARSE	GS_TYP	SS_FINE	2	3	3	4	5	0
PC	GB_SAND	GS_SAND	SS_FINE	2	3	3	4	5	0
PC	GB_TYP	GS_COARSE	SS_FINE	2	3	3	4	5	0
PC	GB_TYP	GS_FINE	SS_FINE	2	3	4	4	5	1
PC	GB_TYP	GS_SAND	SS_FINE	2	3	4	4	5	0
PC	GB_TYP	TB_LIME	SS_FINE	2	3	4	4	5	0
PC	GB_TYP	TS_LIME	SS_FINE	2	3	4	4	5	0
PC	TB_AC	GS_COARSE	SS_FINE	2	3	4	4	5	0
PC	TB_AC	GS_TYP	SS_FINE	2	3	4	4	5	0
PC	TB_AC	TS_LIME	SS_FINE	2	3	4	4	5	0
PC	TB_CEMENT	GS_FINE	SS_FINE	2	3	4	4	5	1
PC	TB_LCB	TS_LIME	SS_FINE	2	3	4	4	5	0
PC	TB_STAB	GS_FINE	SS_FINE	2	3	4	4	5	1
PC	TB_STAB	TS_LIME	SS_FINE	2	3	4	4	5	0
PC_RUBBLIZED	GB_TYP	GS_SAND	SS_FINE	2	3	4	4	5	0
PCC_CRACKED	GB_TYP	GS_COARSE	SS_FINE	2	3	3	4	5	0
PCC_CRACKED	GB_TYP	GS_SAND	SS_FINE	2	3	4	4	5	0
PCC_CRACKED	TB_LCB	GS_COARSE	SS_FINE	2	3	4	4	5	0
TB_AC	GB_TYP	GS_COARSE	SS_FINE	2	3	4	4	5	0
TB_AC	GB_TYP	GS_FINE	SS_FINE	2	3	4	4	5	1
TB_AC	GB_TYP	GS_SAND	SS_FINE	2	3	4	4	5	0
TB_AC	GB_TYP	TS_LIME	SS_FINE	2	3	4	4	5	0
TB_AC	GB_TYP	TS_STAB	SS_FINE	2	3	4	4	5	0
TB_AC	GS_COARSE	GS_COARSE	SS_FINE	2	3	4	4	5	0
TB_AC	GS_TYP	GS_COARSE	SS_FINE	2	3	4	4	5	0
TB_AC	GS_TYP	GS_SAND	SS_FINE	2	3	4	4	5	0
TB_AC	TB_AC	GB_TYP	SS_FINE	2	2	3	4	5	0
TB_AC	TB_AC	GS_FINE	SS_FINE	2	2	3	3	4	1
TB_AC	TB_AC	GS_TYP	SS_FINE	2	2	3	4	5	0
TB_AC	TB_AC	TS_FINE	SS_FINE	2	2	3	4	5	0
TB_AC	TB_AC	TS_LIME	SS_FINE	2	2	3	3	4	0
TB_AC	TB_AC	TS_STAB	SS_FINE	2	2	3	4	5	0
TB_AC	TS_AC	GS_TYP	SS_FINE	2	2	3	4	5	0
TB_AC	TS_STAB	GS_FINE	SS_FINE	2	3	4	4	5	1
TB_CEMENT	GS_COARSE	GS_FINE	SS_FINE	2	3	4	4	5	1
TB_STAB	GS_COARSE	GS_FINE	SS_FINE	2	3	4	4	5	1
TB_STAB	GS_COARSE	TS_LIME	SS_FINE	2	3	4	4	5	0
TB_STAB	GS_TYP	TS_STAB	SS_FINE	2	3	4	4	5	0
TB_STAB	TS_LIME	GS_FINE	SS_FINE	2	3	4	4	5	1
GB_COARSE	GS_COARSE	TS_AC	SS_COARSE	2	2	3	4	5	0
GB_COARSE	GS_SAND	TS_AC	SS_COARSE	2	2	3	4	5	0
GB_TYP	AC	GS_TYP	SS_COARSE	2	3	4	4	5	0
GB_TYP	GB_TYP	TS_LIME	SS_COARSE	2	2	3	3	4	0
GB_TYP	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	4	0
GB_TYP	GS_COARSE	TS_LIME	SS_COARSE	2	3	4	4	5	0
GB_TYP	GS_TYP	GS_COARSE	SS_COARSE	2	2	3	3	4	1
GB_TYP	GS_TYP	GS_SAND	SS_COARSE	2	2	3	4	5	0
GB_TYP	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5	0
PC	GB_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
PC	GB_TYP	GS_FINE	SS_COARSE	2	3	3	4	5	0
PC	GB_TYP	GS_SAND	SS_COARSE	2	3	4	4	5	0
PC	GB_TYP	GS_TYP	SS_COARSE	2	3	3	4	5	0
PC	TB_AC	GS_COARSE	SS_COARSE	2	3	4	4	5	1
PC	TB_AC	GS_FINE	SS_COARSE	2	3	4	4	5	0
PC	TB_AC	GS_TYP	SS_COARSE	2	3	4	4	5	0
PC	TB_AC	TS_LIME	SS_COARSE	2	3	4	4	5	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 36. PCC surface with three layers between PCC and subgrade.
LAYER_ AFTER_PC_1	LAYER_ AFTER_PC_2	LAYER_ AFTER_PC_3	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ SS_DESIG	BC_ LAYER_ NO	SS_ sub_ 24
TB_AC	TS_STAB	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_CEMENT	GS_FINE	TS_LIME	SS_COARSE	2	3	4	4	5	0
TB_LCB	GB_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_LCB	GS_COARSE	TS_LIME	SS_COARSE	2	3	4	4	5	0
TB_LCB	GS_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_STAB	GB_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_STAB	GS_FINE	TS_LIME	SS_COARSE	2	3	4	4	5	0
TB_STAB	GS_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_STAB	GS_TYP	GS_FINE	SS_COARSE	2	3	3	4	5	0
TB_STAB	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5	0
TB_STAB	TS_STAB	GS_COARSE	SS_COARSE	2	2	3	3	4	1
AC	AC	PC	SS_FINE	2	2	3	4	5	0
AC	PC	GB_FINE	SS_FINE	2	2	3	3	4	1
AC	PC	GB_SAND	SS_FINE	2	2	3	4	5	0
AC	PC	GB_TYP	SS_FINE	2	2	3	4	5	0
AC	PC	TB_CEMENT	SS_FINE	2	2	3	4	5	0
AC	PC	TB_STAB	SS_FINE	2	2	3	4	5	0
AC	TB_STAB	TS_LIME	SS_FINE	2	3	4	4	5	0
GB_TYP	GS_COARSE	TS_LIME	SS_FINE	2	3	4	4	5	0
GB_TYP	GS_FINE	GS_TYP	SS_FINE	2	3	3	4	5	0
TB_AC	AC	GS_COARSE	SS_FINE	2	2	3	4	5	0
TB_AC	AC	GS_SAND	SS_FINE	2	2	3	4	5	0
TB_AC	AC	TS_LIME	SS_FINE	2	2	3	3	4	0
TB_AC	GB_TYP	GS_FINE	SS_FINE	2	3	4	4	5	1
TB_AC	GB_TYP	TS_LIME	SS_FINE	2	3	4	4	5	0
TB_AC	GB_TYP	TS_STAB	SS_FINE	2	3	3	4	5	0
TB_AC	TS_AC	TS_LIME	SS_FINE	2	2	3	3	4	0
TB_AC	TS_LIME	GS_FINE	SS_FINE	2	2	3	3	4	1
TB_CEMENT	GS_SAND	TS_LIME	SS_FINE	2	3	4	4	5	0
TB_LCB	GS_COARSE	TS_LIME	SS_FINE	2	3	4	4	5	0
TB_LCB	GS_FINE	GS_TYP	SS_FINE	2	3	3	4	5	0
TB_STAB	GS_COARSE	TS_LIME	SS_FINE	2	3	4	4	5	0
TB_STAB	GS_TYP	GS_COARSE	SS_FINE	2	3	3	4	5	0
TB_STAB	GS_TYP	GS_FINE	SS_FINE	2	3	4	4	5	1
TB_STAB	TS_STAB	GS_COARSE	SS_FINE	2	3	3	4	5	0
AC	AC	GB_TYP	SS_COARSE	2	2	3	4	5	0
AC	AC	PC	SS_COARSE	2	2	3	4	5	0
AC	PC	GB_TYP	SS_COARSE	2	2	3	4	5	0
AC	TB_STAB	GS_COARSE	SS_COARSE	2	2	3	3	4	1
GB_TYP	GB_TYP	GS_COARSE	SS_COARSE	2	2	3	3	4	1
GB_TYP	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	4	5	1
GB_TYP	GS_COARSE	GS_FINE	SS_COARSE	2	2	3	4	5	0
GB_TYP	GS_COARSE	TS_LIME	SS_COARSE	2	2	3	3	4	0
GB_TYP	GS_FINE	GS_FINE	SS_COARSE	2	3	3	4	5	0
TB_AC	GB_TYP	GS_COARSE	SS_COARSE	2	3	4	4	5	1
TB_AC	GS_COARSE	GS_COARSE	SS_COARSE	2	3	3	3	4	1
TB_AC	GS_COARSE	TS_LIME	SS_COARSE	2	3	4	4	5	0
TB_AC	GS_TYP	GS_TYP	SS_COARSE	2	3	3	4	5	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 37. AC surface with four layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	LAYER_ AFTER_ AC_4	SS_TYPE	BC_ LAYER _2_ DESIG	BC_ LAYER_ 3_ DESIG	BC_ LAYER_4_ DESIG	BC_ LAYER_5_ DESIG	BC_ LAYER _SS_ DESIG	BC_ LAYER_NO	SS_ sub_ 24
TB_AC	GB_TYP	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	4	4	5	1
TB_AC	GS_TYP	GS_COARSE	GS_COARSE	SS_COARSE	2	3	4	4	4	5	1
TB_AC	TB_AC	GB_TYP	GS_COARSE	SS_COARSE	2	2	3	4	4	5	1
TB_AC	TB_AC	GS_COARSE	TS_LIME	SS_COARSE	2	2	3	4	4	5	0
GB_TYP	TS_AC	GS_TYP	GS_TYP	SS_FINE	2	2	3	3	4	5	0
PC	TB_CEMENT	GS_COARSE	TS_LIME	SS_FINE	2	2	3	4	4	5	0
PC	TB_CEMENT	GS_SAND	TS_LIME	SS_FINE	2	3	3	4	4	5	0
PC	TB_STAB	GS_COARSE	TS_LIME	SS_FINE	2	3	3	4	4	5	0
PC	TB_STAB	GS_TYP	GS_COARSE	SS_FINE	2	3	4	4	4	5	0
PC	TB_STAB	TS_STAB	GS_COARSE	SS_FINE	2	3	3	4	4	5	0
PCC_ CRACKED	TB_STAB	GS_TYP	GS_FINE	SS_FINE	2	3	4	4	4	5	1
TB_AC	GB_TYP	TS_STAB	GS_COARSE	SS_FINE	2	3	3	3	4	5	0
TB_AC	GB_TYP	TS_STAB	GS_FINE	SS_FINE	2	3	4	4	4	5	1
TB_AC	TB_AC	GB_TYP	TS_STAB	SS_FINE	2	2	3	3	4	5	0
TB_AC	TB_AC	TS_STAB	GS_FINE	SS_FINE	2	2	3	4	4	5	1
TB_AC	TS_AC	GS_TYP	GS_FINE	SS_FINE	2	2	3	4	4	5	1
TB_LCB	TB_STAB	TS_STAB	TS_STAB	SS_FINE	2	3	3	3	4	5	0
PC	AC	PC	GB_TYP	SS_COARSE	2	2	2	3	4	5	0
PC	GB_TYP	GS_FINE	GS_FINE	SS_COARSE	2	3	3	3	4	5	0
PC	TB_AC	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	4	4	5	1
PC	TB_CEMENT	GS_FINE	TS_LIME	SS_COARSE	2	3	4	4	4	5	0
PC	TB_STAB	GS_FINE	TS_LIME	SS_COARSE	2	3	4	4	4	5	0
PC	TB_STAB	TS_STAB	GS_COARSE	SS_COARSE	2	3	3	4	4	5	1
PCC_ CRACKED	TB_STAB	GS_TYP	GS_FINE	SS_COARSE	2	3	4	4	4	5	0
TB_AC	GB_TYP	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	4	5	1
TB_AC	GB_TYP	GS_COARSE	TS_LIME	SS_COARSE	2	3	4	4	4	5	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 38. PCC surface with four layers between PCC and subgrade.
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	LAYER_ AFTER_ PC_4	SS_TYPE	BC_ LAYER _2_ DESIG	BC_ LAYER _3_ DESIG	BC_ LAYER _4_ DESIG	BC_ LAYER _5_ DESIG	BC_ LAYER _SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
AC	AC	PC	GB_TYP	SS_COARSE	2	2	2	3	4	5	0
AC	PC	GB_TYP	GS_COARSE	SS_COARSE	2	2	3	4	4	5	1
AC	PC	GB_TYP	GS_SAND	SS_COARSE	2	2	3	4	4	5	0
AC	PC	TB_STAB	GS_COARSE	SS_COARSE	2	2	3	4	4	5	1
AC	PCC_ CRACKED	TB_STAB	GS_TYP	SS_COARSE	2	2	3	4	4	5	0
GB_ COARSE	GS_ COARSE	GS_FINE	GS_FINE	SS_COARSE	2	2	3	3	4	5	0
TB_AC	GB_TYP	GB_TYP	GS_COARSE	SS_COARSE	2	3	3	4	4	5	1
TB_LCB	GS_ COARSE	GS_ COARSE	GS_TYP	SS_COARSE	2	3	3	4	4	5	0
AC	AC	PC	GB_TYP	SS_FINE	2	2	2	3	4	5	0
AC	PC	GB_ COARSE	TS_LIME	SS_FINE	2	2	3	4	4	5	0
AC	PC	GB_TYP	GS_COARSE	SS_FINE	2	2	3	4	4	5	0
AC	PC	GB_TYP	GS_SAND	SS_FINE	2	2	3	4	4	5	0
TB_AC	GB_TYP	GS_ COARSE	TS_LIME	SS_FINE	2	3	3	4	4	5	0
TB_AC	GB_TYP	GS_FINE	GS_TYP	SS_FINE	2	3	3	4	4	5	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 39. AC surface with five layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	LAYER_ AFTER_ AC_4	LAYER_ AFTER_ AC_5	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ SS_ DESIG	BC_ LAYER_ NO
PC	GB_COARSE	GS_COARSE	GS_FINE	GS_FINE	SS_COARSE	2	3	3	4	4	4	5
TB_AC	AC	AC	AC	TS_STAB	SS_COARSE	2	3	3	3	4	4	5
GB_TYP	TS_AC	GS_TYP	GS_TYP	GS_TYP	SS_FINE	2	3	4	4	4	4	5

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 40. PCC surface with six layers between PCC and subgrade.
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	LAYER_ AFTER_ PC_4	LAYER_ AFTER_ PC_5	LAYER_ AFTER_ PC_6	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ 7_DESIG	BC_ LAYER_ SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
AC	AC	AC	PC	GB_COARSE	GS_TYP	SS_FINE	2	2	2	3	4	4	4	5	1

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 41. AC surface with seven layers between AC and subgrade.
LAYER_ AFTER_ AC_1	LAYER_ AFTER_ AC_2	LAYER_ AFTER_ AC_3	LAYER_ AFTER_ AC_4	LAYER_ AFTER_ AC_5	LAYER_ AFTER_ AC_6	LAYER_ AFTER_ AC_7	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ 7_DESIG	BC_ LAYER_ 8_DESIG	BC_ LAYER_ SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
GB_TYP	GS_TYP	GS_TYP	TS_AC	GS_TYP	GS_TYP	GS_TYP	SS_FINE	2	2	2	3	3	3	3	3	4	0

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

Table 42. PCC surface with seven layers between PCC and subgrade.d
LAYER_ AFTER_ PC_1	LAYER_ AFTER_ PC_2	LAYER_ AFTER_ PC_3	LAYER_ AFTER_ PC_4	LAYER_ AFTER_ PC_5	LAYER_ AFTER_ PC_6	LAYER_ AFTER_ PC_7	SS_TYPE	BC_ LAYER_ 2_DESIG	BC_ LAYER_ 3_DESIG	BC_ LAYER_ 4_DESIG	BC_ LAYER_ 5_DESIG	BC_ LAYER_ 6_DESIG	BC_ LAYER_ 7_DESIG	BC_ LAYER_ 8_DESIG	BC_ LAYER_ SS_ DESIG	BC_ LAYER_ NO	SS_ sub_ 24
AC	AC	AC	AC	PC	TB_CEMENT	TS_LIME	SS_FINE	2	2	2	2	3	4	4	4	5	1
AC	AC	AC	AC	PC	TB_STAB	TS_LIME	SS_FINE	2	2	2	2	3	4	4	4	5	1

Note: Abbreviations found in the table are standard notations included in the LTPP data tables and are defined in the LTPP database.

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Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, Backcalculation, Deflection data, Elastic modulus, EVERCALC©, Falling weight deflectometer, Long-Term Pavement Performance, LTPP, MODCOMP©, MODTAG©, Modulus, Mechanistic-Empirical Pavement Design Guide, Pavement evaluation
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Scheduled Update: Archive - No Update needed

This page last modified on 01/31/2017

Long-Term Pavement Performance Program Determination of In-Place Elastic Layer Modulus: Backcalculation Methodology and Procedures

Appendix C: Development of the Simulated Layer Structure for the Backcalculation Process Using Evercalc© and Modcomp©

BACKCALCULATION STRUCTURE FOR CASES USING BEDROCK IN THE BACKCALCULATION STRUCTURE

BACKCALCULATION STRUCTURE FOR CASES WITHOUT BEDROCK IN THE BACKCALCULATION STRUCTURE

Appendix C: Development of the Simulated Layer Structure for the Backcalculation Process Using Evercalc^© and Modcomp^©