A STRATEGIC APPLICATION OF ROLLER COMPACTED CONCRETE BASE IN AIRFIELD APRON CONSTRUCTION

PRESENTED BY TAREQ MAHMOOD

Candidate for Masters of EngineeringUniversity of Waterloo

SYNOPSIS

• Stategic Model• Limit State Design• Transport Canada Design• Constructability• Sensitivity Analysis• Life Cycle Cost Analysis• Marketability

Background

• Pavement Management System• Apron : Functional • Regulatory Requirements• Roller Compacted Concrete • RCC Properties and Uses• Innovative Approach

Strategic Model

International Airport

• Type of Aircraft (Concorde, B-747-200, DC-1—20/30, DC-8-63, B-727)• Gear: 380KN Gear Load• Tire Pressure: 1.15 Mpa• Sub grade Bearing Strength:110 – 135(spring – fall), 110 x 80% = 88KN

• Assume sub-grade condition is SP, Poorly Graded Sand, • 20% spring reduction, • The RCC base thickness is 250mm, and the sub-base is 207 mm.

Regional/Local Airport

• Type of Aircraft (King Air, F27, DC – 4-M2 )• Gear: 60KN Gear Load• Tire Pressure: 0.4 – 0.7 Mpa• Sub grade Bearing Strength: 110 – 135(spring – fall), • 110 x 80% = 88KN

• Assume sub-grade condition is SP, Poorly Graded Sand, • The RCC base is 150mm – 230mm

Constructability• RCC material property• Mix Design• Homogeneous property• Operation, One lift• Workability Problem, stiffness, zero slump• Admixture effect, • Jointing

Sensitivity Analysis

Coefficient of Variation:• Flexural strength (R),• Load transfer (LT), • Concrete pavement thickness

(h), • Sub grade reaction (k)

Life Cycle Cost Analysis

• RCC vs. PCC• Initial Cost high, low maintenance• Break Even Point – 16 years• 4% discounted rate

• EUAC• Savings $20 per/m2

Cost Component

Design Life

Conventional Pavement

(cost per m2)

Design Life

RCC Base Pavement(cost per

m2)

Agency cost 30 21.50 30 17.50

Initial construction Cost 0 71.50 0 84.32

Minor Maintenance 30 17.30 30 9.00

Major Maintenance and Rehabilitation 30 34.70 30 14.70

Total NPV 145.00 125.52

Compare and Marketing• High Asphalt and Steel Cost• Competitive over JPCP,JRCP, A/C

• By 2025, • over $400M GDP• 1,500 person/ years jobs

• Low Maintenance Cost• Speed of Construction• Heavy duty Pavement

Projection and Summary• Limited research • Laboratory – controlled tests and investigation• Full scale pavement loading field test • Growth and advancement of RCC application• Moving from PCC to RCC

Questions??