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 Commercial Water The Need for Coatings in Commercial Water

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Water and Wastewater Technical Reasons for Attack Concrete  When freshly poured it is highly alkaline (≥ 12.5 pH). -Exposure to acids with pH below 6.5 will attack most cement based concretes and below 4 all types will be attacked.  Acids can be naturally occurring or manmade. -Decayed organic matter as well as manufactured inorganic acids.  Acidic solutions react with calcium hydroxide dissolving it forming salts ( chlorides, sulfates and nitrates).

Water and Wastewater Concrete attack DamagedCrown H 2 SO 4 O2O2O2O2 Slime/SludgeLayer S 2 + 2H HS + H H2SH2SH2SH2S  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 O2O2O2O2

Water and Wastewater The Need for Coatings in 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

Water and Wastewater The Need for Coatings in 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

Water and Wastewater Coatings Available  Vinyl Sheet Liners -Linabond -T-Lock  Spray applied coatings -Polyurea’s -Epoxy’s  Trowel Applied Coatings -Cementitious -Reinforced Epoxy’s

Water and Wastewater Sheet Liners with Seams

Water and Wastewater

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

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Water and Wastewater Typical Failure of Mat Reinforced Liner

Water and Wastewater Polyurea underfilm corrosion

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Water and Wastewater Cementitious failure

Water and Wastewater Common Causes for premature Failures  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

Water and Wastewater

Water and Wastewater

Water and Wastewater 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

Water and Wastewater

Water and Wastewater

Water and Wastewater Abrasive blasting opens up bug holes

Water and Wastewater 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

Water and Wastewater

Water and Wastewater

Water and Wastewater

Water and Wastewater Chesterton 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..\..\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 MILS MILS DFT FOR HIGH ABRASION AND IMPACT ZONES MILS WITH S1HB MILS DFT WATERLINE 12” KEY IN 791 FOR SMOOTH TRANSITION CHESTERTON 797 PRIMER AND S1HB MATERIAL APPLIED

Water and Wastewater

Water and Wastewater What makes a superior product and 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.

Water and Wastewater Writing Specifications  Specify only the best technologies for performance  Demand higher standards for specifications -PERFORMANCE BASED SPECIFICATIONS –..\Condition Surveys\City of Laredo.doc..\Condition Surveys\City of Laredo.doc  Proven application histories in severe environments  Extended warranties (real warranties) –Chesterton Warranty..\..\..\My Documents\Warranty draft.doc..\..\..\My Documents\Warranty draft.doc

Water and Wastewater Manufacturer/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