CE-T3 Quiz 2 Review PDF

CE-T3 QUIZ 2 REVIEW MODULE 7: Highway Maintenance and 2. PCC Surfaces Rehabilitation - Repairs: Filling and sealing of joints and Highway Maintenance cracks...

CE-T3 QUIZ 2 REVIEW MODULE 7: Highway Maintenance and 2. PCC Surfaces Rehabilitation - Repairs: Filling and sealing of joints and Highway Maintenance cracks - Routine work performed to keep a Repairing spalled, scaled, and pavement under normal conditions map cracked areas of traffic and normal forces of Patching areas where failure nature, as nearly as possible in its has occurred original condition (monitoring Reaping areas damaged by pavement health) settlement and pumping - Maintenance actions help slow the Treating buckled pavement rate of deterioration by identifying 3. Maintenance of Shoulders and and addressing specific pavement Approaches deficiencies that contribute to - Approaches include public side overall deterioration roads, private driveways, ramps. Speed change lanes, and turnouts Maintenance Operations - Approach maintenance is similar - Surface maintenance to main roadway maintenance - Road side maintenance 4. Maintenance of Roadsides - Shoulder and approaches - Roadside include area between maintenance traveled surface and the limit of the - Bridges, tunnels, and drainage right-o-way (medians, roadside structure maintenance parks, ROW fences, etc.) - Traffic controls and safety devices - Vegetation management and (road signs, pavement markings, control (include mowing, weed traffic signals, and road lighting) eradication and control, seeding, planting vegetations, and care of Maintenance of Road Surfaces trees and shrubs) 1. Bituminous Surfaces - Maintenance of rest areas - failures due to weathering, failure 5. Maintenance of Bridges, Tunnels, of base or subgrade due o material and Drainage Structures quality or compaction or improper - Bridges need to minimize drainage deterioration or repair damage - Repairs: caused by accidents, floods, or Patching other unforeseen events Scarifying - Steel bridges need to be cleaned Resealing and painted to precent erosion Non skid surface treatment  CE-T3 QUIZ 2 REVIEW - Concrete bridge decks may - However, the best-maintained deteriorate due to the corrosion of pavements will deteriorate with reinforcement bars due to time and will need rehabilitation penetration of water and de-icing - Conventional rehabilitation: salts or chemicals Reconstruct with all new - Bridge deck with minor materials deterioration is to be patched with Patch and overlay with new special concrete wearing surface - For major deterioration it is to be - Due to high construction cost, new overlayed or removed and methods of rehabilitation are constructed raised: - Tunnels (special attention areas): Pavement Milling – surface Supports – check for decays layers can be removed with a Tunnel walls and ceilings – milling machine and replace check for leaks with new hot-mix Portals – free from loose rocks Pavement Recycling – Lighting – for visibility technique where an existing Ventilation degraded pavement is modified - Drainage Structures (following and transformed into a should be kept in good condition:) homogeneous structure that Surface drainage can support the traffic Ditches requirements Culverts - Traffic Control and Safety Devices Guardrails, barriers, impact MODULE 8: Recycling Equipment and attenuators, pedestrian Methods overpasses and underpasses, fence to restrict access of Recycling pedestrians and animals - Action or process of converting Safety devices should be waste into reusable material frequently and systematically inspected and repaired Recycling Highways - Using recovered concrete, brick, Pavement Rehabilitation and asphalt materials for the - Proper maintenance to extend construction of pavements, pavement life earthworks, and drainage  CE-T3 QUIZ 2 REVIEW - This provides potential cost savings - RAP percentages range from 10 to and conservation of natural 50 percent resources - Produced by batch plants or drum plants Pavement Recycling Batch Plant – make small - Technique where an existing accurate batches of asphalt degraded pavement is modified mixture through a process that and transformed into a is repeated over and over until homogeneous structure that can the total tonnage for a project support the traffic requirements has been manufactured - A report from the Federal Highway Drum Plant – prepare the Administration shows that 80 asphalt mix through a percent of asphalt pavement that’s continuous process and require removed each year during widening the use of silos for temporary and resurfacing projects is reused storage prior to the mix being trucked to the paving location Asphalt Pavement Recycling - Four primary methodologies in Hot In-place Recycling (HIR) pavement recycling - Method where the existing 1. Hot Recycling pavement is heated and softened, Hot Mix Asphalt or Warm Mix and ten scarified/milled to a Asphalt containing Recycled specified depth Asphalt Pavement (RAP) - New HMA/WMA (with or without 2. Hot In-place Recycling (HIR) RAP) and/or recycling agent may be 3. Cold Recycling added to the scarified RAP material Cold In-place Recycling (CIR) during the recycling process Cold Central Plant Recycling - HIR can be performed either as a (CCPR) single pass or as a multiple pass 4. Full Depth Reclamation (FDR) operation Single Pass – scarified in-place Hot Mix Asphalt (HMA) and Warm Mix material can be combined with Asphalt Recycling new material if needed or - Process in which Reclaimed desired Asphalt Pavement (RAP) is Multiple Pass – restored RAP combined with new materials to material is recompacted first, produce HMA/WMA mixes and a new wearing surface is - RAP material can be obtained by applied later milling or a crushing operation - Three HIR Processes:  CE-T3 QUIZ 2 REVIEW 1. Surface Recycling (hardening) in the upper 50 mm (2 2. Repaving in) of the pavement surface 3. Remixing - Asphalt pavements with one seal coat are remixable and the seal Surface Recycling coat may help in softening the - Primary purpose of the surface recycled binder recycling process is to eliminate - Pavements with multiple seal coats surface irregularities and cracks can create smoke and fire t the - Equipment consists of the surface and act as an insulator following: against the heating of the 1. Preheating unit underlying pavement 2. Heating and recycling unit 3. Rubber-tired roller Cold In-place Recycling - Existing pavement is pulverize in- Repaving place and recompacted into a - Useful when the surface recycling pavement layer process is not sufficient to restore - Either as foamed asphalt binder or the pavement’s desirable surface an asphalt emulsion is added as a requirements or when a recycling agent or binder conventional HMA overlay is impractical or not needed Cold Central Plant Recycling (CCPR) - Equipment: - Material removed from an existing 1. Preheating unit pavement I transported to a central 2. Heating and recycling unit location – either on the project site 3. Rubber-tired roller or an existing asphalt plant 4. Paver - Either a foamed asphalt binder or an asphalt emulsion is added as a Remixing recycling agent or binder - Used when repaving method is not sufficient to restore the pavement Full Depth Reclamation (FDR) to its desirable properties and - Recycling method where all of the additional aggregates or new HMA asphalt pavement section and a mix are required to provide strength predetermined number of and stability to the existing underlying materials are mixed and pavement manipulated in-place and treated t - Process can effectively eliminate produce a stabilize base course rutting, cracking, and oxidation - Steps: 1. Pulverization  CE-T3 QUIZ 2 REVIEW 2. Introduction of additive 3. Shaping of the mixed material 4. Compaction 5. Application of a surface or a wearing course - Performed at a depth of 4 to 12 inches