1

By:Prof. Hamad I. Al-Abdul Wahhab

Modified Binders

WHY?

WHAT?

HOW?

CONTENT

2

WHY MODIFICATION?

• Asphalting Projects (Construction / Maintenance)

Continue

• Application of SUPERPAVE Mix Design

• Asphalt Mix Problems Diversity

• Asphalt Liquid Price (SR. 300/ton)

MOST ASPHALT PAVEMENT DISTRESSES ARE RELATED TO BINDER PROPERTIES

Asphalt Role

3

• PRICE OF ASPHALT

• THIN PAVEMENTS

• INCREASED TRAFFIC, LOADS, AND TIRE PRESSURE

• DEFERRED MAINTENANCE

• DISPOSAL OF INDUSTRIAL WASTE

• NEW CONSTRUCTION EQUIPMENT

• EXCESS SUPPLY OF PRODUCTS

WHY MODIFICATION?

TARGETED PAVEMENT PROBLEMS

• PERMANENT DEFORMATIONDistortion or shovingRutting

• CRACKINGRepeated load (fatigue cracking)Non-load (thermal cracking)

• DISINTIGRATIONRavelingStripping (moisture damage)

4

CHANGE

IMPROVED PAVEMENT DESIGN

REVISION OF SPECIFICATONS

QUALITY CONTROL

IMPROVEMENT OF BINDERS SYSTEMS

IDEAL PAVEMENT BINDER

• LOW STIFFNESS AT CONSTRUCTION TEMPERATURE

• LOW STIFFNESS AT LOW PERFORMANCE TEMPERATURE

• HIGH STIFFNESS AT HIGH PERFORMANCE TEMPERATURE

• IMPROVED ADHESION

5

Temperature25C 60C 135C

Ave. Service Temp.

Mixing &

Compaction

Conventional asphalt mix

Visc

osity

(Stif

fnes

s)Hot

Summer

Ideal modified asphalt mix

0CTemperature

25C 60C 135C

Ave. Service Temp.

Mixing &

Compaction

Conventional asphalt mix

Visc

osity

(Stif

fnes

s)Hot

Summer

0C

CLASSIFICATION OF MODIFIERS

• FILLER

• EXTENDER

• RUBBER

• PLASTIC

• COMBINATIONS

• FIBERS

• OXIDENTS

• ANTIOXIDANTS

• ANTISTRIPS

6

USES OF MODIFIED ASPHALTS

ASPHALTCONCRETE

CHIPSEALS

SLURRY SEALSMICROSURFACING

RECYCLING

COLD IN-PLACEHOT CENTRALPLANT

CONSTRUCTION

• STORAGE

• TRANSPORT

• HANDLING

• MIXING

• PLACEMENT

• COMPACTION

7

FILLERS

CARBONBLACK

MINERAL SULFUR

FLY ASHCRUSHERSFINES LIME P.C.

EXTENDER

SULFUR LIGNIN

8

POYMERS

RUBBER PLASTIC

RUBBERS THERMOPLASTIC

PLASTICS THERMO SET

9

RUBBER

NATURAL LATEX

SYNTHETIC LATEX

BLOCK COPOLYMER

RECLAIMED RUBBER

PLASTICSHOMOPOLYMERS

POLYETHYLENE (PE)

POLYPROPYLENE(PP)

RANDOM COPOLYMERS

POLYVINYL CHLORIDE (PVC)

ETHELENE VINYL ACETATE (EVA)

10

PROPERTIES&

CONSTRUCTION

COMBINATIONS

11

FIBERS

NATURAL SYNTHETIC

ASBESTOS POLYPROPYLENE

ROCK WOOL FIBERGLASS

POLYESTER

OXIDANT

CATALYST TO ACCELERATE ASPHALTHARDENING SUCH AS MANGANESE SALT

12

ANTIOXIDENT

LEADSALTS

CARBON CALCIUMSALTS

TO RETARD OXIDATIVE HARDENING

HYDROCARBON

RECYCLINGAGENT NATURAL

ASPHALT(TRINIDAD

LAKE)

HARDASPHALTS

(GILSONITE)

TO SOFTEN OR HARDEN ASPHALT

13

ANTISTRIP

LIQUIDSAMINES

SOLIDSLIME

COST

MODIFIER STORAGE ADDITION

LAYDOWN &COMPACTION

PRODUCTION

e.g. Polymer Cost ~ SR. 8000/ton

14

MODIFIER FORMS

POWDEROR

DUST

PELLETSOR

GRANULES

LIQUIDSFIBERS

CONSTRUCTION OPERATIONS

STORAGECONVEYORS

SAFETYPUMP & LINE

CLEANING

BLENDING UNITSTEMPERATURES

15

QUALITY CONTROL

BINDERTYPE

MIXTURECONCENTRATION

Plants: Mill

Modifier Production

16

Modifier Production

Modifier Production

17

Modifier Production

MicrographsMicrographs

Modifier Testing

18

Products from MillsProducts from Mills

10um

PE

Modifier Testing

ProductsProducts

10um

Modifier Testing

19

ProductsProducts

10um

SBS/PE

Modifier Testing

Waste Makes PollutionWaste Makes Pollution

Modifier Utilization

20

Asphalt Rubber Solves problems

Tires used

Rubber Utilization