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PROTECTION & PRESERVATION OF ASPHALT SURFACES AN INTRODUCTION TO SEALCOATING Girish C. Dubey S.T.A.R., INC. MARCH, 2003. OBJECTIVES. 1. To understand Asphalt Pavements , their;  Basic construction and make up,  Strengths and weaknesses, 2. Why they have to be protected ?

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OBJECTIVES

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Objectives 4169217

PROTECTION & PRESERVATION OF ASPHALT SURFACES AN INTRODUCTION TOSEALCOATINGGirish C. DubeyS.T.A.R., INC.MARCH, 2003


Objectives

OBJECTIVES

1. To understand Asphalt Pavements , their;

Basic construction and make up,

Strengths and weaknesses,

2. Why they have to be protected ?

3. Which types of pavements can be protected?

4. How can they be protected ?

5. Overall Savings and value to the property owner.

Concept Of

SEALCOATINGS


Asphalt pavement definition pavement

ASPHALT PAVEMENT DEFINITIONPAVEMENT

The solid floor of any construction that carries traffic;

VEHICULAR :

High Traffic :Highways, Roads, Streets,

Low traffic : Airport runways, aprons, parking lots, driveways, service stations..

PEDESTRIAN: Walkways.

CONSTRUCTION

The earth is removed and

- Filled with large aggregates (gravel, rocks, limestone- Base course

- Filled with smaller aggregates- Sub-base course

- Covered with hot molten asphalt (5-10% By weight) mixed with finer aggregates- top course.

THIS TOP LAYER, SO TO SPEAK , IS THE " ROOF OF THE PAVEMENT".

TOP COURSE

(ASPHALT MIX)

SUB-BASE COURSE

BASE COURSE

THE CONSTRUCTION VARIES WITH THE TRAFFIC LOAD REQUIREMENTS.


Objectives 4169217

A. PRIOR HISTORY OF ROAD CONSTRUCTION:Constructed with Clay, Limestone, RocksFunctional but severely damaged by rain:The aggregates absorbed water, became soft and lost their strength to carry loads.Roads were destroyed in no time.

Roads were destroyed in no time

B. ASPHALT AS A PAVING MATERIAL- Used since 18th. century

A by-product of petroleum refining process was plentiful and had excellent;

Adhesive (Gluing) properties,

Water repellency- will not let water penetrate the pavement and damage it.

Flexibility- Pavement surface will flex under traffic without cracking.

ASPHALT KEPT WATER OUT OF THE PAVEMENTS,

KEEPING THE BASE DRY AND FUNCTIONAL


Objectives 4169217

WHAT IS ASPHALTIT IS A BY-PRODUCT OF PETROLEUM REFINING PROCESS.CRUDE PETROLEUM-ORIGINATED FROM THE DECAY OF MARINE LIFE OVER MILLIONS OF YEARS.CRUDE PETROLEUMREFINING PROCESS (REMOVES LIGHTER FRACTIONS SOLVENTS,GASOLINE, OILS, GREASE..)RESIDUE : ASPHALT -CHEAP, PLENTIFULIT IS A VERY COMPLEX MIXTURE OF OVER 5000 COMPOUNDS.

ASPHALT AS A PAVING MATERIAL

SHORTCOMINGS

1. DETERIORATES UNDER SUN'S ULTRAVIOLET RAYS

2. DISSOLVED BY PETROCHEMICALS (GASOLINE, OILS, FATS, GREASE ETC.)

3. ATTACKED BY CHEMICALS, DEICING SALTS ETC.


Objectives 4169217

WHY ???ATTACKED BY THE ULTRAVIOLET RAYS AND CHEMICALSBECAUSE A MAJORITY OF THECOMPOUNDS PRESENT IN ASPHALT ARE NOT STABLE. THEY HAVE ;•OPEN CHAIN STRUCTURE (ALIPHATIC) WITH •SITES OF UNSATURATION (DOUBLE AND TRIPLE BONDS) O H H O H H H H H H H H H H H HO C C C C C C C C C C C C C C C H H H H H H H H H H ATTACK

ASPHALTIC COMPOUNDS ARE:

ATTACKED AT THE SITES OF UNSATURATION

THE RESULTING PRODUCTS:

DO NOT POSSESS ANY OF THE PROPERTIES OF THE ORIGINAL ASPHALT MOLECULES.

DISSOLVED BY PETROCHEMICALS

(GASOLINE, OILS, FATS, GREASE ETC..)

- SAME ORIGIN, SIMILAR MOLECULAR STRUCTURE.

- NATURAL AFFINITY, THEY COEXISTED IN NATURE

OVER MILLION OF YEARS.

LIKE DISSOLVES THE LIKE.


Objectives 4169217

ASPHALT PAVEMENTS BREAKDOWNTHE TOP LAYER(UNDER THE ELEMENTS OF WEATHER, PETROCHEMICALS ETC. )ASPHALT BINDER BREAKS DOWN(GLUING PROPERTIES ARE LOST)AGGREGATES COME UNGLUED, START RAVELINGSURFACE CRACKS DEVELOP(WATER SEEPS IN, STARTS DAMAGING THE BASE)CRACKS WIDEN(FURTHER DAMAGE BY WATER)BASE AND SUBBASE COURSES ARE DAMAGED (LOAD CARRYING CAPACITY IS LOST)END OF THE PAVEMENTFRESH OVERLAY NEEDED IN 6-7


Objectives 4169217

WHY PROTECT???SAVE YOUR MAJOR INVESTMENTENHANCE THE VALUE OF YOUR PROPERTYALL PAVEMENTS DO NOT NEED PROTECTIONNOT NEEDED(TRAFFIC BEARING- HIGHWAYS, ROADS, STREETS)THE ADVANTAGETHE ROLLING TRAFFIC BRINGS UP THE FRESH LAYERS OF ASPHALT CONTINUOUSLY. DETERIORATION IS NOT LOCALIZED TO THE TOP SURFACES.

DESPERATELY NEEDED

LOW TRAFFIC, NON-TRAFFIC BEARING PAVEMENTS:

AIRPORT RUNWAYS APRONS, PARKING LOTS,

SERVICE STATIONS, DRIVEWAYS, ALKWAYS..

DO NOT HAVE THE ADVANTAGE OF THE LIFE GIVING

ROLLING TRAFFIC.

TOP LAYERS ARE UNDER CONTINUOUS ATTACK BY ULTRAVIOLET, GASOLINE, OILS, CHEMICALS ETC.


Objectives 4169217

HOW TO PROTECT ASPHALT PAVEMENTSSEALCOAT !!!!APPLY A COATING THAT WILL:-NOT BE ATTACKED BY THE SAME ELEMENTS THAT DESTROY ASPHALT- FORM A BARRIER COAT IN BETWEEN ASPHALT SURFACE AND THE ELEMENTS.- KEEP THE EXCELLENT PROPERTIES OF ASPHALT " SEALED IN " THE PAVEMENT AND "SEAL OUT" THE DESTRUCTIVE ELEMENTS.DESTRUCTIVE ELEMENTS "SEALED OUT"

ULTRAVOILT (UV) RADIATIONS

SOLVENTS

WATER

FUEL

SEALCOATING

ASPHALT PROPERTIES

"SEALED IN"

SUCH COATINGS ARE ALSO, RIGHTFULLY CALLED"SEALCOATINGS”


Objectives 4169217

REFINED TAR (MATERIAL OF CHOICE)BECAUSE:REFINED TAR HAS EXCELLENT resistance to:Ultraviolet RadiationPETROCHEMICALS, GASOLINE, OILS, FATDEICING SALTS & CHEMICALSREFINED TAR IS A VERY COMPLEX MIXTURE OF (>5000) VERY STABLECLOSED RING, AROMATIC COMPOUNDS

ORIGIN- ENTIRELY DIFFERENT THAN ASPHALT.

ASPHALT- DECAY OF MARINE LIFE

REFINED TAR IS DERIVED FROM COAL

COAL- ORIGINATES FROM THE DECAY OF PLANT LIFE

(FORESTS, BOGS, VEGETATION..)

COALCOKE (FUEL FOR STEEL MILLS)

DISTILLATES, REFINED TAR

FURTHER DISTILLATIONREFINED TAR

CHEMISTRIES OF PLANTS ARE QUITE DIFFERENT TO THOSE OF MARINE LIFE, THEREFORE , THE DIFFERENCES IN THE PROPERTIES OF THEIR DERIVATIVES.


Objectives 4169217

SEALCOATINGS COMPOSITIONSEALCOATINGS ARE WATER- BASED COATINGS .FORMULATED BY DISPERSING:-REFINED TAR-WATER-CLAYS AND FILLERS-SURFACTANTS/ EMULSIFIERSALSO CALLED REFINED TAR PITCHEMULSIONS (C.T.P.E.), THEY ARE;- EASY TO APPLY (BRUSH, SQUEEGEE, SPRAY)- EASY TO HANDLE AND STORE,- EASE OF WATER CLEAN UP OF TOOLS,- NO SOLVENT FUMES OR HAZARDS OF SOLVENT BASED COATINGSAPPROVED BYU.S. - FEDERAL AVIATION ADMINISTRATION:P-625, 627,628U.S. GOVERNMENTAL SERVICES ADMIN. LOCAL AND STATE GOVERNMENTS


Objectives 4169217

APPLICATIONPAVEMENT PREPARATION:GENERAL GUIDELINESPRIOR TO SEALCOATING:1. A. NEW PAVEMENTS: ALLOW TO CURE (OXIDIZE) TO RID OF SURFACE OILS, PERFORM WATER BREAK TEST- NO SURFACE BEADING B. OLD PAVEMENTS:REPAIR THE DAMAGED AREAS;SEAL ALL CRACKS,REMOVE DAMAGED AREAS- REPATCH WITH FRESH ASPHALT MIX,2. CLEAN THE PAVEMENT:REMOVE DIRT AND DEBRIS,SCRAPE OIL SPOTS AND PRIME WITH OIL SPOT PRIMER.3. APPLY SEALCOATING MIX:FOG THE SURFACE WITH A MIST OF WATERIF SURFACE TEMPERATURES ARE ABOVE FORTY (40) DEGREES CELSIUS.APPLY THE FIRST COAT WITH A RUBBER SQUEEGEE, FOLLOWED BY A BRUSH FOR THE 2ND. COAT.SPRAY APPLICATION ACCEPTABLE IF APPLIED BY AN EXPERIENCED APPLICATOR.4. FOLLOW SAFE HANDLING PROCEDURESDO NOT APPLYBELOW 50° FRAIN IN THE FORECAST


Objectives 4169217

MIX DESIGNSSEALCOATING IS NEVER APPLIED IN ITS CONCENTRATED FORM GENERALLY MIXED WITH; WATER, SILICA SAND WORKABLE CONSISTENCYDESIRED PROPERTIESSTANDARD SYSTEM(A 2-COAT APPLICATION SYSTEM)Two coat application @ 0.18-0.20 gal/sq. yard.IST COAT : 0.1-0.12 GAL OF SEALER/ SQ. YARDIIND. COAT: 0.1-0.12 GAL OF SEALER/ SQ. YARD MIX DESIGNSEALCOATING (CONC)100 GALWATER (30% BY VOL. OF THE SEALER) 30 GALSILICA SAND (AVG. 50-70 MESH), LB 200-300 TOTAL 145 GAL.


Objectives 4169217

BENEFITS OF SEALCOATINGTHROUGH REGULAR MAINTENANCE PROGRAMS:1. SAVES MONEY FOR THE OWNER:PAVEMENT LIFE CAN BE EXTENDED BY APPROX. 300%2. PROTECTS AND PRESERVES THE ASPHALT PAVEMENT3.ENHANCES BUSINESS IMAGETHE BLACK/ DARK SLATE COLOR OF THE SEALCOATING WILL NOT FADE . ASPHALT TURNSGRAY IN NO TIME.4. CLEANING BECOMES EASIER. DIRT AND DEBRIS ARE EASILY WASHED OFF BY RAIN.5. TRAFFIC MARKINGS LAST LONGER.


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