I N D U S T R I A L P R O D U C T S A N D S E R V I C E S

ARC ARC Commercial WaterCommercial WaterARC ARC Commercial WaterCommercial Water

The Need for Coatings in Commercial Water

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Technical Reasons Technical Reasons for Attackfor AttackTechnical Reasons Technical Reasons for Attackfor Attack

Concrete When freshly poured it is highly alkaline (When freshly poured it is highly alkaline (≥ 12.5 pH)≥ 12.5 pH)..

- Exposure to acids with pH below 6.5 will attack most cement Exposure to acids with pH below 6.5 will attack most cement based concretes and below 4 all types will be attacked.based concretes and below 4 all types will be attacked.

Acids can be naturally occurring or manmade.Acids can be naturally occurring or manmade.- Decayed organic matter as well as manufactured inorganic Decayed organic matter as well as manufactured inorganic

acids.acids.

Acidic solutions react with calcium hydroxide Acidic solutions react with calcium hydroxide dissolving it forming salts ( chlorides, sulfates and dissolving it forming salts ( chlorides, sulfates and nitrates).nitrates).

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Concrete attackConcrete attackConcrete attackConcrete attack

Damaged Damaged CrownCrown

HH22SOSO44

OO22

Slime/SludgeSlime/SludgeLayerLayer

SS22 + 2H + 2H HS + HHS + H

HH22SS

Normal household waste has a pH between 6-8 yet it contains bacteria, sulfates and organic materials which generate sulfides.

In presence of water sulfides convert to hydrogen sulfide gas.

Hydrogen sulfide gases contact moist surfaces of pipe where it is oxidized by bacteria into sulfuric acid

OO22

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The Need for Coatings The Need for Coatings in Commercial Waterin Commercial WaterThe Need for Coatings The Need for Coatings in Commercial Waterin Commercial Water

Concrete as a material of construction is porous and, due to its alkaline nature, is reactive when exposed to acidic compounds.

Naturally occurring sulfur oxidizing bacteria (thiobaccilius) metabolizes condensed H2S gases from decaying organic matter and generates dilute sulfuric acid

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The Need for Coatings The Need for Coatings in Commercial Waterin Commercial WaterThe Need for Coatings The Need for Coatings in Commercial Waterin Commercial Water

Passive oxide films on steel are attacked by dilute acids found in sewerage systems.

Flow assisted corrosion with additional entrained solids/grit increase removal of passive oxides

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Coatings AvailableCoatings AvailableCoatings AvailableCoatings Available

Vinyl Sheet Liners- Linabond- T-Lock

Spray applied coatings- Polyurea’s- Epoxy’s

Trowel Applied Coatings- Cementitious- Reinforced Epoxy’s

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Sheet Liners with SeamsSheet Liners with SeamsSheet Liners with SeamsSheet Liners with Seams

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BlisteringBlisteringBlisteringBlistering

Liners can experience blistering under mastic coat in crown re-building Projects (Low Adhesion)

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Typical Failure of Mat Reinforced Typical Failure of Mat Reinforced LinerLinerTypical Failure of Mat Reinforced Typical Failure of Mat Reinforced LinerLiner

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Polyurea underfilm corrosionPolyurea underfilm corrosionPolyurea underfilm corrosionPolyurea underfilm corrosion

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Cementitious failureCementitious failureCementitious failureCementitious failure

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Common Causes for prematureCommon Causes for prematureFailuresFailuresCommon Causes for prematureCommon Causes for prematureFailuresFailures

Seem delaminations are most common cause for sheet liner failures

Pinholes cause most failures in spray applied coatings- Outgassing of concrete - Entrained air in product- Bug holes in surface

Cementitious coatings fail due to low chemical resistance, low bond strength and pin holes

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ADDRESSING BUG HOLESADDRESSING BUG HOLES

TYPICAL CONCRETE WALL

COMMON BUG HOLE

WATER BLASTING DOES NOT ALWAYS OPEN BUG HOLE

MANY COATINGS MANUFACTURERS SUGGEST COATING OVER UNEXPOSED

BUG HOLES

TRAPPED AIR ESCAPES THROUGH COATING CAUSING PIN HOLE REQUIRING

PATCHING

WITH THIS APPROACH IT IS VERY DIFFICULT TO FIND AND REPAIR ALL PIN HOLES RESULTING IN POSSIBLE CONCRETE

EXPOSURE TO CORROSIVE GASES

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Abrasive blasting opens up bug holesAbrasive blasting opens up bug holesAbrasive blasting opens up bug holesAbrasive blasting opens up bug holes

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ADDRESSING BUG HOLES CONT’

TYPICAL CONCRETE WALL

COMMON BUG HOLE

ABRASIVE BLASTING EXPOSES HOLE

INSTALLATION OF REPAIR MATERIAL ASSURES NO TRAPPED

AIR

(SPARGE COAT)

APPLICATION OF CHESTERTON S1HB COMPLETES COATING

PROCESS

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Chesterton Ultimate ProtectionChesterton Ultimate ProtectionChesterton Ultimate ProtectionChesterton Ultimate Protection

Ultimate Protection is a combination system designed to provide the best of both worlds in substrate protection.

We utilize a High Build Quartz Reinforced Composite and a High Build Mineral Reinforced Spray composite

..\..\Brochures\Coatings\Trowelables for concrete\Ultimate Protection.pdf

TYPICAL BARSCREEN CHANNEL, JUNCTION BOX AND WET WELL LINING SYSTEM

CHESTERTON 797 PRIMER AND 791 COMPOSITE MATERIAL APPLIED

797 PRIMER @ 7-10 MILS

791 APPLIED @ 250 MILS

DFT

FOR HIGH ABRASION

AND IMPACT ZONES

797 PRIMER @ 7-10 MILS WITH S1HB

APPLIED @ 80-125 MILS DFT

WATERLINE12”

KEY IN 791 FOR SMOOTH TRANSITION

CHESTERTON 797 PRIMER AND S1HB

MATERIAL APPLIED

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What makes a superior product and What makes a superior product and application?application?What makes a superior product and What makes a superior product and application?application?

Manufacture under vacuum with high shear equipment.- No entrained air in product reducing pinholes

Coupling agents used for reinforcement materials provides denser lower permeation characteristics (more reactive sites)

Proper application and preparation methods are key to long term success. No coating will succeed without proper installation.

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Writing SpecificationsWriting SpecificationsWriting SpecificationsWriting Specifications

Specify only the best technologies for performance

Demand higher standards for specifications- PERFORMANCE BASED SPECIFICATIONS

– ..\Condition Surveys\City of Laredo.doc

Proven application histories in severe environments

Extended warranties (real warranties)– Chesterton Warranty..\..\..\My Documents\Warranty draft.doc

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Manufacturer/Installer RequirementsManufacturer/Installer RequirementsManufacturer/Installer RequirementsManufacturer/Installer Requirements

Demand the latest and most effective technologies in coating systems.

Demand better performance from the installers by tightening installation specifications.

Write performance based coating specifications.

Require single source responsibility.- substrate repair, coating installation