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Federal Highway Administration
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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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| This report is an archived publication and may contain dated technical, contact, and link information |
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Publication Number: FHWA-RD-03-088 Date: November 2003 |
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The Maintenance (MNT) and Rehabilitation (RHB) modules house very similar and often related data, and are therefore discussed in the same chapter. In the future, it is planned to collapse the MNT and RHB modules into a single module to avoid confusion on where these closely related data types are stored.
Major improvements to a test section after inclusion in the LTPP program are documented in the RHB module. The tables in this module contain information on activities such as overlay properties and construction, shoulder replacement, and joint repair. Rehabilitation activities include resurfacing, reconstruction, and the addition of lanes. Rehabilitation sometimes alters the pavement structure. In these cases, layer data are recorded.
The MNT module contains data reported by highway agencies on maintenance treatments applied to test sections. This module primarily records activities conducted on the test section after inclusion in the LTPP program. However, one table contains information on maintenance treatments applied prior to inclusion of the test section in the LTPP study. While the data in the MNT tables include information such as placement of seal coats, patches, joint resealing, milling , and grooving , users should also examine information stored in the RHB module since these two activities are closely related. Unlike the RHB module, there is no significant pavement structure change from a maintenance event, and therefore no maintenance layer table exists.
Regardless of whether a treatment is considered maintenance or rehabilitation, the pavement structure will always be represented in the appropriate TST tables. Chapter 14 contains more information on TST tables.
Participating highway agencies are requested to notify the LTPP regional office prior to performing maintenance or rehabilitation on a highway segment containing an LTPP section. This allows the regional office to collect any necessary monitoring data to identify the condition of the pavement prior to the activity. Data are collected on pavement condition before and after all rehabilitation and many maintenance activities. States provide information on paper forms describing the actual work done.
Some types of rehabilitation do not fit either the GPS or SPS experiments. Sections receiving those treatments are placed out of study, are no longer studied after rehabilitation, and do not have data in this module for that treatment.
IMP_TYPE
provides information on the type of maintenance or rehabilitation performed, and is used in both MNT_IMP and RHB_IMP . The field uses a code named MAINT_WORK. Some of these codes are very similar and, therefore, one type of activity may be represented by different codes in different records.
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For SPS maintenance and rehabilitation experiments, much of the data related to the experimental maintenance treatments are stored in tables in the SPS module. |
This field should be used to determine which other MNT or RHB tables contain the specifics of the activity. Table 3 shows the general relationships between IMP_TYPE and the MNT and RHB tables. Because of the variability in the maintenance and rehabilitation improvements, and the use of SPS_* tables for some of these data, different tables may be completed for different projects, and data may not be stored in the expected MNT or RHB table for a given IMP_TYPE code. Data may not always be available for a given improvement, and when DATA_AVAIL_IMS is "N", there will be no data in other MNT and RHB tables.
Table 3. IMP_TYPE and expected location of data in MNT and RHB tables.
|
IMP_TYPE |
Improvement Type |
Expected Location of Specific Data in MNT and RHB Tables |
|---|---|---|
| 1 |
Crack Sealing |
MNT_PCC_CRACK_SEAL MNT_ASPHALT_CRACK_SEAL |
| 2 |
Transverse Joint Sealing |
MNT_PCC_JOINT_RESEAL |
| 3 |
Lane-Shoulder Longitudinal Joint Sealing |
MNT_PCC_JOINT_RESEAL |
| 4 |
Full-Depth Transverse Joint Repair Patch |
MNT_PCC_FULL_DEPTH |
| 5 |
Full-Depth Patching of PCC Pavement Other Than at Joint |
MNT_PCC_FULL_DEPTH |
| 6 |
Partial-Depth Patching of PCC Pavement Other Than at Joint |
MNT_PCC_PART_DEPTH |
| 7 |
PCC Slab Replacement |
MNT_PCC_FULL_DEPTH |
| 8 |
PCC Shoulder Restoration |
RHB_RESTORE_PCC_SHOULDER |
| 9 |
PCC Shoulder Replacement |
RHB_RESTORE_PCC_SHOULDER |
| 10 |
AC Shoulder Restoration |
RHB_RESTORE_AC_SHOULDER |
| 11 |
AC Shoulder Replacement |
RHB_RESTORE_AC_SHOULDER |
| 12 |
Grinding Surface |
MNT_GMC |
| 13 |
Grooving Surface |
MNT_GMG |
| 14 |
Pressure Grout Subsealing |
RHB_SUBSEALING_PCC |
| 16 |
Asphalt Subsealing |
RHB_SUBSEALING_PCC |
| 19 |
AC Overlay |
RHB_ACO_* RHB_PMA_ * |
| 20 |
PCC Overlay |
RHB_PCCO_* |
| 21 |
Mechanical Premix Patch |
MNT_ASPHALT_PATCH |
| 22 |
Manual Premix Spot Patch |
MNT_ASPHALT_PATCH |
| 23 |
Machine Premix Patch |
MNT_ASPHALT_PATCH |
| 24 |
Full-Depth Patch of AC Pavement |
MNT_ASPHALT_PATCH |
| 25 |
Patch Pot Holes: Hand Spread, Compacted With Truck |
MNT_ASPHALT_PATCH |
| 26 |
Skin Patching |
MNT_ASPHALT_PATCH |
| 27 |
Strip Patching |
MNT_ASPHALT_PATCH |
| 28 |
Surface Treatment, Single Layer |
MNT_ASPHALT_SEAL |
| 29 |
Surface Treatment, Double Layer |
MNT_ASPHALT_SEAL |
| 30 |
Surface Treatment, Three or More Layers |
MNT_ASPHALT_SEAL |
| 31 |
Aggregate Seal Coat |
MNT_ASPHALT_SEAL |
| 32 |
Sand Seal Coat |
MNT_ASPHALT_SEAL |
| 33 |
Slurry Seal Coat |
MNT_ASPHALT_SEAL |
| 34 |
Fog Seal Coat |
MNT_ASPHALT_SEAL |
| 35 |
Prime Coat |
MNT_ASPHALT_SEAL |
| 36 |
Tack Coat |
MNT_ASPHALT_SEAL |
| 37 |
Dust Layering |
MNT_ASPHALT_SEAL |
| 38 |
Longitudinal Subdrainage |
RHB_SUBDRAINAGE |
| 39 |
Transverse Subdrainage |
RHB_SUBDRAINAGE |
| 40 |
Drainage Blankets |
RHB_SUBDRAINAGE |
| 41 |
Well System |
RHB_SUBDRAINAGE |
| 42 |
Drainage Blankets With Longitudinal Drains |
RHB_SUBDRAINAGE |
| 43 |
Hot-Mix Recycled AC |
RHB_HMRAP_* RHB_PMA_* |
| 44 |
Cold-Mix Recycled AC |
RHB_CMRAP_* RHB_PMA_* |
| 45 |
Heater Scarification, Surface-Recycled AC |
RHB_HEATER_SCARIF |
| 46 |
Crack-and-Seat PCC Pavement as Base for New AC Surface |
RHB_CRACK_SEAT_PCC |
| 47 |
Crack-and-Seat PCC Pavement as Base for New PCC Surface |
RHB_CRACK_SEAT_PCC |
| 48 |
Recycled PCC |
RHB_RCYPCC_* RHB_PCCO_* |
| 49 |
Pressure Relief Joints in PCC Pavements |
RHB_PRESSURE_RELIEF |
| 50 |
Joint Load-Transfer Restoration in PCC Pavements |
RHB_LOAD_TRANSFER |
| 51 |
Mill Off AC and Overlay With AC |
RHB_MILL_AND_GRIND RHB_ACO_* RHB_PMA_* |
| 52 |
Mill Off AC and Overlay With PCC |
RHB_MILL_AND_GRIND RHB_PCCO_* |
| 53 |
Other |
|
| 54 |
Partial-Depth Patching of PCC Pavements at Joints |
MNT_PCC_PART_DEPTH |
| 55 |
Mill Existing Pavement and Overlay With Hot-Mix AC |
RHB_MILL_AND_GRIND RHB_HMRAP_* RHB_PMA_* |
| 56 |
Mill Existing Pavement and Overlay With Cold-Mix AC |
RHB_MILL_AND_GRIND RHB_CMRAP_* RHB_PMA_* |
DATA_AVAIL_IMS in MNT_IMP and RHB_IMP indicates whether information on the maintenance or rehabilitation activity is available in other MNT or RHB tables. The creation of a record in MNT_IMP or RHB_IMP is an important step in the process of assigning a construction number, and this field is necessary so that entries can be made in the MNT_IMP or RHB_IMP tables before the specifics of the activity are known.
MNT_IMP: This table contains a listing of the various maintenance activities conducted on each test section after its inclusion in the LTPP program and the date on which these treatments were applied.
MNT_PCC_CRACK_SEAL: This table contains crack sealing information for PCC pavements, including the type of sealant used, how it was applied, and how much sealing was performed.
MNT_PCC_FULL_DEPTH: This table contains information on full-depth PCC repair, including the reasons for the repair, the size of the replacement slab, the material used for replacement, the interface of the replacement with the existing pavement, and finishing/curing methods.
MNT_PCC_JOINT_RESEAL: This table contains joint resealing information for PCC pavements, including information on the removal of existing joint seal ant, the application and type of the new sealant, and the quantity of sealing performed.
MNT_PCC_PART_DEPTH: This table contains information on partial-depth patching for PCC pavements, including the reasons for patching, the type of patching performed, the material used for patching and material properties, jointing, and curing methods for PCC patches.
MNT_ASPHALT_CRACK_SEAL: This table contains crack sealing information for AC pavements, including the type of sealant used, how it was applied, and how much sealing was performed.
MNT_ASPHALT_PATCH: This table contains patching information for AC pavements, including the reasons for patching, the size of patching, and patching techniques.
MNT_ASPHALT_SEAL: This table contains seal-coat application information for AC pavements, including the reasons for sealing, the type and properties of the sealant used, and application information.
MNT_GMG: This table contains information on diamond grinding , milling , and grooving of all pavement surface types, including the reasons for treatment and the details of the treatment type and application.
MNT_COST: This table contains cost information for maintenance activities. Because of differences in the way highway agencies compute costs, users should expect inconsistencies in cost information.
MNT_HIST: This table contains information on section maintenance that occurred prior to the section's inclusion in the LTPP program, including only basic information such as type and quantity of maintenance.
These tables are not specific to any one type of rehabilitation, and may be filled out regardless of the rehabilitation performed. RHB_IMP will be filled out for every rehabilitation event, and RHB_LAYER will be completed only for those rehabilitations that alter the layer structure.
RHB_IMP: This table contains a complete list of the rehabilitation treatments placed after the test section was included in the LTPP program. This table also contains when the treatments were placed.
RHB_LAYER: This table contains changes to the layer structure based on information provided by the State or Provincial highway agency. This information should not be used when conducting analyses on long-term pavement performance; however, it is considered useful when conducting a detailed analysis of an individual section(s).
RHB_CAUSE_INFO: This table contains information on the cause(s) of rehabilitation for a test section and the scheduled start date for the rehabilitation.
These tables contain information on the construction of AC overlays. They will be used regardless of whether the overlay is recycled AC or not. They will probably be populated when IMP_TYPE = 19, 43, 44, 51, 55, or 56.
RHB_PMA _COMPACTION: This table contains compaction data for all types of AC overlays, including information on roller types and coverage.
RHB_PMA _CONSTRUCTION: This table contains construction data for all types of AC overlays. This table includes plant information and lay-down temperatures.
RHB_PMA _ROLLER: This table contains roller data for rollers used on all types of AC overlays, including the type, weight, and speed of the rollers used for compaction.
These tables are used for nonrecycled asphalt pavement overlays. They will probably be populated only if IMP_TYPE= 19 or 51.
RHB_ACO_AGGR_PROP: This table contains the properties of the aggregate used in AC overlays, including aggregate composition, durability, specific gravity, and gradation .
RHB_ACO_LAB_AGED_AC: This table contains the properties of the laboratory-aged asphalt cement used in AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties .
RHB_ACO_LAB_MIX: This table contains the properties of the AC laboratory mix design used in AC overlays, including asphalt content , air voids, specific gravity, stability, and other AC properties .
RHB_ACO_MIX_PROP: This table contains the as-placed properties of the AC mix used in AC overlays, including asphalt content , air voids, specific gravity, stability, and other AC properties .
RHB_ACO_PROP: This table contains the properties of the asphalt cement used in AC overlays, including the modifiers used, specific gravity, viscosity, ductility, and other asphalt cement properties .
These RHB tables are used for cold-mix recycled AC overlays. They will probably be populated only if IMP_TYPE= 44 or 56. Since this is not a standard treatment option for the LTPP experiments, most of the following tables are empty. Currently, the only table populated in this series is RHB_CMRAP_LAB_MIX, which contains two records.
RHB_CMRAP_COMBINED_AGG: This table contains the properties of the combined aggregate used in cold-mix recycled AC overlays, including aggregate composition, specific gravity, and gradation .
RHB_CMRAP_COMBINE_AC: This table contains the properties of the asphalt cement used in cold-mix recycled AC overlays, including the modifiers used, specific gravity, viscosity, ductility, and other asphalt cement properties .
RHB_CMRAP_GEN_INFO: This table contains the properties of the reclaimed aggregate and general information for cold-mix recycled AC overlays, including the gradation and specific gravity of the reclaimed aggregate, and the methods used to process and break up the existing pavement.
RHB_CMRAP_LAB_AGED_AC: This table contains the properties of the laboratory-aged asphalt cement used in cold-mix recycled AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties .
RHB_CMRAP_LAB_MIX: This table contains the properties of the AC laboratory mix design used in cold-mix recycled AC overlays, including asphalt content , air voids, specific gravity, stability, and other AC properties .
RHB_CMRAP_MIX_PROP: This table contains the as-placed properties of the AC mix used in cold-mix recycled AC overlays, including asphalt content , air voids, specific gravity, stability, and other AC properties .
RHB_CMRAP_NEW_AC_PROP: This table contains the properties of the new asphalt cement used in cold-mix recycled AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties.
RHB_CMRAP_RECLAIM_AC: This table contains the properties of the reclaimed asphalt cement used in cold-mix recycled AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties.
RHB_CMRAP_UNTREAT_AGGR: This table contains the properties of the untreated aggregate used in cold-mix recycled AC overlays, including aggregate composition, durability, specific gravity, and gradation .
These RHB tables are used for hot-mix recycled AC overlays. They will probably be populated only if IMP_TYPE = 43 or 55.
RHB_HMRAP_COMBINED_AGG: This table contains the properties of the combined aggregate used in hot-mix recycled AC overlays, including aggregate composition, specific gravity, and gradation .
RHB_HMRAP_COMBINE_AC: This table contains the properties of the asphalt cement used in hot-mix recycled AC overlays, including the modifiers used, specific gravity, viscosity, ductility, and other asphalt cement properties .
RHB_HMRAP_GEN_INFO: This table contains the properties of the reclaimed aggregate and general information on hot-mix recycled AC overlays, including the gradation and specific gravity of the reclaimed aggregate and the methods used to process and break up the existing pavement.
RHB_HMRAP_LAB_AGED_AC: This table contains the properties of the laboratory-aged asphalt cement used in hot-mix recycled AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties .
RHB_HMRAP_LAB_MIX: This table contains the properties of the AC laboratory mix design used in hot-mix recycled AC overlays, including asphalt content , air voids, specific gravity, stability, and other AC properties.
RHB_HMRAP_MIX_PROP: This table contains the as-placed properties of the AC mix used in hot-mix recycled AC overlays, including asphalt content , air voids, specific gravity, stability, and other AC properties .
RHB_HMRAP_NEW_AC_PROP: This table contains the properties of the new asphalt cement used in hot-mix recycled AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties .
RHB_HMRAP_RECLAIM_AC: This table contains the properties of the reclaimed asphalt cement used in hot-mix recycled AC overlays, including viscosity, ductility, penetration, and other asphalt cement properties.
RHB_HMRAP_UNTREAT_AGGR: This table contains the properties of the untreated aggregate used in hot-mix recycled AC overlays, including aggregate composition, durability, specific gravity, and gradation.
These tables include information on PCC overlays. These tables will probably be populated when IMP_TYPE = 20, 48, or 52.
RHB_PCCO_AGGR: This table contains the properties of the aggregate used in PCC overlays, including aggregate composition, durability, specific gravity, and gradation.
RHB_PCCO_CONSTRUCTION: This table contains construction data for PCC overlays, including information on curing , temperature, and existing surface preparation.
RHB_PCCO_JOINT_DATA: This table contains joint data for PCC overlays, including information on construction and expansion joints, sealants, and load-transfer devices.
RHB_PCCO_MIXTURE: This table contains PCC mixture data for PCC overlays, including information on mix design, admixtures , slump, air entrainment, and other PCC mix properties.
RHB_PCCO_STEEL: This table contains information on reinforcing steel used in PCC overlay s, including the type and strength of the reinforcement and some placement information.
RHB_PCCO_STRENGTH: This table contains PCC strength data for PCC overlays, including flexural, compressive, and tensile strength, and elastic modulus.
These tables contain information on PCC overlays using recycled PCC pavement. These tables will probably be populated when IMP_TYPE = 48. Since recycled PCC overlays were not an LTPP study topic, the tables in this module are currently empty.
RHB_RCYPCC_COMBINED_AGGR: This table contains the properties of the combined aggregate used in recycled PCC overlays, including aggregate durability, specific gravity, and gradation.
RHB_RCYPCC_CONSTRUCTION: This table contains construction data for recycled PCC overlays, including information on curing, temperature, and existing surface preparation.
RHB_RCYPCC_JOINT: This table contains joint data for recycled PCC overlays, including information on construction and expansion joints, sealants, and load-transfer devices.
RHB_RCYPCC_MIXTURE: This table contains PCC mixture data for recycled PCC overlays, including information on mix design, admixtures, slump, air entrainment, and other PCC mix properties.
RHB_RCYPCC_NEW_AGGR: This table contains the properties of the new (nonrecycled) aggregate used in recycled PCC overlays, including aggregate composition, durability, specific gravity, and gradation.
RHB_RCYPCC_STEEL: This table contains information on reinforcing steel used in recycled PCC overlays, including the type and strength of the reinforcement and some placement information.
RHB_RCYPCC_STRENGTH: This table contains PCC strength data for recycled PCC overlays, including flexural, compressive, and tensile strength, and elastic modulus.
INV_MAJOR_IMP: This table contains data on major maintenance and rehabilitation treatments that were applied to the test section prior to its inclusion in the LTPP program.
