Pavement Design. Guest Lecturer Dr. Sirous Alavi, P.E. SIERRA TRANSPORTATION Terminal Way, Suite 125 Reno, Nevada 89502

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1 Pavement Design Guest Lecturer Dr. Sirous Alavi, P.E. SIERRA TRANSPORTATION ENGINEERS,, INC. I 1005 Terminal Way, Suite 125 Reno, Nevada 89502

2 Topics Introduction Design Factors Pavement Types Fundamentals of Pavement Design AASHTO Asphalt Institute

3 Design Factors Climate Material Properties Traffic Pavement Structure Pavement Condition

4 Climate Temperature Moisture

5 Material Properties Nondestructive Testing Field and Laboratory Testing

6 Nondestructive Testing Falling Weight Deflectometer (FWD) Ground Penetrating Radar (GPR) Seismic Pavement Analyzer Magnetic Induction Tomography (MIT)

7 Falling Weight Deflectometer (FWD) Uses Basis for estimating in-situ properties Estimate of structural capacity Assess variability Rehabilitation (overlay) design

8 Ground Penetrating Radar (GPR) Underground cross-sectional sectional image Burst of radio- frequency energy radiated into the ground to detect discontinuities in the ground

9 Portable Seismic Pavement Analyzer (PSPA) Operating principle is based on generating and detecting stress waves in the pavement structure

10 Magnetic Induction Tomography (MIT) Sensor unit emits electromagnetic pulses and detects the induced magnetic field

11 Field and Laboratory Testing Drilling & Sampling California Bearing Ratio (CBR) Resistance Value (R-value) Dynamic Cone Penetrometer (DCP) Triaxial Fatigue

12 Drilling and Sampling Cores Soils Beams

13 California Bearing Ratio (CBR) Applying load to a small penetration piston at a rate and recording the total load at a certain penetration Penetration Piston Sample

14 Resistance Value (R-value) Expresses a material's resistance to deformation as a function of the ratio of transmitted lateral pressure to applied vertical pressure Pressure Gauge Rubber Membrane Fluid Under Pressure Testing Head Sample Base

15 Dynamic Cone Penetrometer (DCP) Supply kinetic energy to the penetrometer, which causes it to move a distance through the soil

16 Triaxial Testing Most versatile test available to determine the stress-strain strain properties of soil

17 Fatigue Testing Cyclic loading to test specimen Load can be a repeated application of a fixed load or simulation of in-service loads Load may be repeated millions of cycles at predefined loading time

18 Traffic Critical factor Consider both the loading magnitude and configuration and the number of load repetitions

19 Pavement Damage 2000 Repetitions < 1 Repetition

20 Types of Equipment Weigh-In In-Motion (WIM) Bending Plate, Load Cell, Piezo Sensors

21 Types of Equipment Classifiers Road Tubes, Inductance Loops, Piezo Sensor, Video

22 Types of Equipment Counters Road Tubes, Inductance Loops, Piezo Sensor, Video

23 Pavement Condition Profiler Automated Distress Survey Manual Manual Distress Survey

24 Profiler Comprehensive system that is used to collect roadway surface data for determining the ride quality

25 Automated Distress Survey Inspection of pavement and identifying distresses High speed equipment that takes pictures of roadway Processed manually or by computer

26 Automated Distress Survey Images are taken of pavement Distresses are classified and quantified Images are Images are stored digitized Images are processed and analyzed

27 Manual Distress Survey Distresses separated based on pavement type Rigid, Flexible Distress Identification Manual (DIM)

28 Rigid Pavement Corner Breaks Durability D Cracking Longitudinal Transverse

29 Rigid Pavement Joint Seal Damage Longitudinal Joint Spalling Transverse Joint Spalling

30 Rigid Pavement Map Cracking Scaling Polished Aggregate

31 Flexible Pavement Fatigue Cracking Block Cracking

32 Flexible Pavement Longitudinal Transverse

33 Flexible Pavement Potholes Patches

34 Flexible Pavement Rutting Shoving

35 Flexible Pavement Bleeding Raveling

36 Flexible Pavement Water Bleeding & Pumping

37 Types of Pavement Rigid Pavements Acts like beam over any irregularities in underlying supporting material Flexible Pavements Layered system in contact with any irregularities in underlying supporting material

38 Rigid Pavement Constructed of portland cement concrete (PCC) Analyzed by the Plate Theory Jointed, Continuously Reinforced PCC BASE (OPTIONAL) SUBGRADE

39 Flexible Pavement Surface constructed of bitumininous materials Flexible" since the total pavement structure "bends" due to traffic loads Structure is generally composed of several layers of materials SURFACE (AC) BASE SUBBASE (OPTIONAL) SUBGRADE

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