HIRENG ET 04: Failures, Maintenance, and Rehabilitation off Transportation Infrastructure

Highway

• Any public road or public way that serves as major route for transportation usually onnetiing towns or cities

Pavement fractures

• Can be seen as cracks,spelling or chipping off the pavement surface

Fatigue cracking

• Caused by loss of base or subgrade support, inadequate structural design, and poor construction

Block craking

• Caused by shrinkage and daily temperature cycles

Transverse cracking

• Cuused by shrinkage of pavement due to low temperature or asphalt hardening

Longitudinal craking

• Results from poor joint onstrution orloation

Corner breaks

• Caused by load repetitions combined with loss of support, poor load transfer across the joint, curling and warping o stresses

Durability craking

• Caused by the presence of freeze—thaw susceptible aggregate

Blow-ups

• Caused by high compressive stresses resulting from joints being filled with incompressible material

Potholes

• The end result of fatigue cracking

Punch-outs

• Caused by steel corrosion,inadequate mount of steel, excessively ide shrinkage racks or excessively lose shrinkage cracks

Spalling

• Caused by heavy traffic loading, excess stress at joints, weak concrete pavements, and misalignment or corroded doowl

Pavement distorton

• Evidenced by ruts or corrugation of the surface

Ruttiing

• Usually cased by lateral movement or consolidation of the materials duue to traffic loading

Fauting

• Resultofslaab pumping, slab settlement, curling, or warping

Corrugation

• Usually caused by traffic action combined with low stiffness pavement or excessive moisture in the subgrade

Depression

• Caused by frost heave orsubragde settlement

Pavement disintegration

• The progressive breaking up of the pavement into small loosepieces

Raveling

• Results from the loss ofbond between the aggregate particles and the asphalt binder

Scaling

• Results from the lossoff ine aggregate and mortar due to freeze-thaw damage

Bleeding

• Occurs when asphalt binder fills the aggregate voids during hot weather and expands onto the surface

Fat spots

• Caused by significant moisture int eh aggregates which force the asphhalt binder out of the surfacec

Roadway deterioraton

• Caused by the inevitable wear and tear that occurs over years

Corrective maintenance

• Permanent or temporary repairs on anas-needed basis

Preventive maintenance

• Surface applications of strutual or non-strutual improvements intended to keep the quality of the pavement above a predetermined level

Surface maintenance

• Perioddi reshaping of the rrroadsurfae to ensure proper drainage andrrafficpassage