TE-22 - UFGS 09 67 23.13 - Standard Resinous Flooring - 2019.pdf

USACE / NAVFAC / AFCEC / NASA UFGS- 09 67 23. 13 ( November 2015) Pr epar i ng Act i v i t y: NASA Super sedi ng UFGS- 09 67 23. 13 ( August 2010)

UNI FI ED FACI LI TI ES GUI DE SPECI FI CATI ONS

Ref er ences ar e i n agr eement wi t h UMRL dat ed Jul y 2019

SECTION TABLE OF CONTENTS

DIVISION 09 - FINISHES

SECTION 09 67 23.13

STANDARD RESINOUS FLOORING

11/15

PART 1 GENERAL

1.1 REFERENCES

1.2 ADMINISTRATIVE REQUIREMENTS

1.2.1 Product Data

1.2.2 Design Mix Data

1.3 SUBMITTALS

1.4 DELIVERY, STORAGE, AND HANDLING

1.5 QUALITY CONTROL

1.5.1 Qualifications

1.5.2 Sampling

1.6 WARRANTY

PART 2 PRODUCTS

2.1 SYSTEM DESCRIPTION

2.2 MATERIALS

2.2.1 Mixes

2.2.1.1 Epoxy-Resin Binder/Matrix

2.2.1.2 Cured Epoxy Binder

2.2.1.3 Aggregate

2.2.1.4 Surface Sealing Coat

PART 3 EXECUTION

3.1 PREPARATION

3.1.1 Safety Precautions

3.1.2 Protection of Adjacent Surfaces

3.1.3 Concrete Subfloor

3.1.3.1 New Concrete Floors

3.1.3.2 Existing Concrete Floors

3.1.4 Steel Subfloor

3.1.5 Mixing Of Materials

3.2 APPLICATION

3.2.1 Areas of Application

3.2.2 Application of Prime Coat and Troweling

SECTION 09 67 23.13 Page 1

3.2.3 Sealer Coat

3.2.4 Integral Cove Base

3.3 FIELD QUALITY CONTROL

3.3.1 Repairing

3.4 ADJUSTING AND CLEANING

-- End of Section Table of Contents --

SECTION 09 67 23.13 Page 2

USACE / NAVFAC / AFCEC / NASA UFGS- 09 67 23. 13 ( November 2015) Pr epar i ng Act i v i t y: NASA Super sedi ng UFGS- 09 67 23. 13 ( August 2010)

UNI FI ED FACI LI TI ES GUI DE SPECI FI CATI ONS

Ref er ences ar e i n agr eement wi t h UMRL dat ed Jul y 2019

SECTION 09 67 23.13

STANDARD RESINOUS FLOORING

11/15

NOTE: Thi s gui de speci f i cat i on cover s t he r equi r ement s f or t hi n- set , t r owel ed, heavy- dut y, epoxy f l oor t oppi ngs.

Adher e t o UFC 1-300-02 Uni f i ed Faci l i t i es Gui de Speci f i cat i ons ( UFGS) For mat St andar d when edi t i ng t hi s gui de speci f i cat i on or pr epar i ng new pr oj ect speci f i cat i on sect i ons. Edi t t hi s gui de speci f i cat i on f or pr oj ect speci f i c r equi r ement s by addi ng, del et i ng, or r evi s i ng t ext . For br acket ed i t ems, choose appl i cabl e i t em( s) or i nser t appr opr i at e i nf or mat i on.

Remove i nf or mat i on and r equi r ement s not r equi r ed i n r espect i ve pr oj ect , whet her or not br acket s ar e present.

Comment s, suggest i ons and r ecommended changes f or t hi s gui de speci f i cat i on ar e wel come and shoul d be submi t t ed as a Criteria Change Request (CCR) .

PART 1 GENERAL

1.1 REFERENCES

NOTE: Thi s par agr aph i s used t o l i s t t he publ i cat i ons c i t ed i n t he t ext of t he gui de speci f i cat i on. The publ i cat i ons ar e r ef er r ed t o i n t he t ext by basi c desi gnat i on onl y and l i s t ed i n t hi s par agr aph by or gani zat i on, desi gnat i on, dat e, and t i t l e.

Use t he Ref er ence Wi zar d' s Check Ref er ence f eat ur e when you add a Ref er ence I dent i f i er ( RI D) out si de of t he Sect i on' s Ref er ence Ar t i c l e t o aut omat i cal l y pl ace t he r ef er ence i n t he Ref er ence Ar t i c l e. Al so use t he Ref er ence Wi zar d' s Check Ref er ence f eat ur e t o updat e t he i ssue dat es.

SECTION 09 67 23.13 Page 3

Ref er ences not used i n t he t ext ar e aut omat i cal l y del et ed f r om t hi s sect i on of t he pr oj ect speci f i cat i on when you choose t o r econci l e r ef er ences i n t he publ i sh pr i nt pr ocess.

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM A990/A990M (2018) Standard Specification for Castings, Iron-Nickel-Chromium and Nickel Alloys, Specially Controlled for Pressure-Retaining Parts for Corrosive Service

ASTM C881/C881M (2015) Standard Specification for Epoxy-Resin-Base Bonding Systems for Concrete

ASTM D445 (2018) Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

ASTM D523 (2014; R 2018) Standard Test Method for Specular Gloss

ASTM D570 (1998; E 2010; R 2010) Standard Test Method for Water Absorption of Plastics

ASTM D638 (2014) Standard Test Method for Tensile Properties of Plastics

ASTM D696 (2016) Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between -30 degrees C and 30 degrees C With a Vitreous Silica Dilatometer

ASTM D1475 (2013) Standard Test Method for Density of Liquid Coatings, Inks, and Related Products

ASTM D1544 (2004; R 2010) Standard Test Method for Color of Transparent Liquids (Gardner Color Scale)

ASTM D1652 (2011; E 2012) Standard Test Method for Epoxy Content of Epoxy Resins

ASTM D2240 (2015; E 2017) Standard Test Method for Rubber Property - Durometer Hardness

ASTM D2471 (1999) Standard Test Method for Gel Time and Peak Exothermic Temperature of Reacting Thermosetting Resins

SECTION 09 67 23.13 Page 4

ASTM D4259 (1988; R 20122018) Standard Practice for AbradingPreparation of Concrete by Abrasion Prior to Coating Application

SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC SP 6/NACE No.3 (2007) Commercial Blast Cleaning

1.2 ADMINISTRATIVE REQUIREMENTS

1.2.1 Product Data

Within [30] [_____] days of contract award, submit manufacturer's catalog data for the following items:

a. Epoxy-Resin Binder/Matrix

b. Cured Epoxy Binder

[ c. Aggregate

] d. Surface Sealing Coat

1.2.2 Design Mix Data

Within [30] [_____] days of contract award, submit design mix data for the following items, including a complete list of ingredients and admixtures:

a. Epoxy-Resin Binder/Matrix

b. Cured Epoxy Binder

c. Surface Sealing Coat

Ensure applicable test reports verify the mix has been successfully tested and meets design requirements.

1.3 SUBMITTALS

NOTE: Revi ew Submi t t al Descr i pt i on ( SD) def i ni t i ons i n Sect i on 01 33 00 SUBMI TTAL PROCEDURES and edi t t he f ol l owi ng l i s t t o r ef l ect onl y t he submi t t al s r equi r ed f or t he pr oj ect .

The Gui de Speci f i cat i on t echni cal edi t or s have desi gnat ed t hose i t ems t hat r equi r e Gover nment appr oval , due t o t hei r compl exi t y or cr i t i cal i t y, wi t h a " G. " Gener al l y, ot her submi t t al i t ems can be r evi ewed by t he Cont r act or ' s Qual i t y Cont r ol Syst em. Onl y add a “ G” t o an i t em, i f t he submi t t al i s suf f i c i ent l y i mpor t ant or compl ex i n cont ext of t he pr oj ect .

For submi t t al s r equi r i ng Gover nment appr oval on Ar my pr oj ect s, use a code of up t o t hr ee char act er s wi t hi n t he submi t t al t ags f ol l owi ng t he " G" desi gnat i on t o i ndi cat e t he appr ovi ng aut hor i t y.

Codes f or Ar my pr oj ect s usi ng t he Resi dent

SECTION 09 67 23.13 Page 5

Management Syst em ( RMS) ar e: " AE" f or Ar chi t ect - Engi neer ; " DO" f or Di st r i ct Of f i ce ( Engi neer i ng Di v i s i on or ot her or gani zat i on i n t he Di st r i ct Of f i ce) ; " AO" f or Ar ea Of f i ce; " RO" f or Resi dent Of f i ce; and " PO" f or Pr oj ect Of f i ce. Codes f ol l owi ng t he " G" t ypi cal l y ar e not used f or Navy, Ai r For ce, and NASA pr oj ect s.

An " S" f ol l owi ng a submi t t al i t em i ndi cat es t hat t he submi t t al i s r equi r ed f or t he Sust ai nabi l i t y eNot ebook t o f ul f i l l f eder al l y mandat ed sust ai nabl e r equi r ement s i n accor dance wi t h Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Locat e t he " S" submi t t al under t he SD number t hat best descr i bes t he submi t t al i t em.

Choose t he f i r st br acket ed i t em f or Navy, Ai r For ce and NASA pr oj ect s, or choose t he second br acket ed i t em f or Ar my pr oj ect s.

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are [for Contractor Quality Control approval.][for information only. When used, a designation following the "G" designation identifies the office that reviews the submittal for the Government.] Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance to Section 01 33 29 SUSTAINABILITY REPORTING. Submit the following in accordance with Section

01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Installation Drawings [; G[, [____]] ]

[ Fabrication Drawings [; G[, [____]] ]

SD-03 Product Data

Manufacturer's Catalog Data [; G[, [____]] ]

SD-04 Samples

Hardboard Mounted Epoxy Flooring [; G[, [____]] ]

Floor Topping [; G[, [____]] ]

SD-05 Design Data

Design Mix Data [; G[, [____]] ]

SD-07 Certificates

Listing of Product Installations [; G[, [____]] ]

Referenced Standards Certificates [; G[, [____]] ]

SD-11 Closeout Submittals

Warranty [; G[, [____]] ]

SECTION 09 67 23.13 Page 6

1.4 DELIVERY, STORAGE, AND HANDLING

Protect materials from weather, soil, and damage during delivery, storage, and construction. Deliver materials in original packages, containers, or bundles bearing brand name and name of material.

Maintain materials used in the installation of floor topping at a temperature between 18 and 30 degrees C 65 and 85 degrees F .

1.5 QUALITY CONTROL

Prior to commencement of work, submit referenced standards certificates for the following, showing conformance with the referenced standards contained in this section:

a. Epoxy-Resin Binder/Matrix

b. Cured Epoxy Binder

c. Aggregate

d. Surface Sealing Coat

1.5.1 Qualifications

Submit a listing of product installations for heavy duty epoxy flooring including identification of at least [5][_____] units, similar to those proposed for use, that have been in successful service for a minimum period of [5][_____] years. Identify purchaser, address of installation, service organization, and date of installation.

Ensure floor system applicators are experienced in the application of troweled [walnut-shell][_____] aggregate thin-set floor topping.

1.5.2 Sampling

Submit hardboard mounted epoxy flooring samples not less than 300 millimeter 12-inch square for each required color.

Provide panels showing nominal thickness of finished toppings, color, and texture of finished surfaces. Finished floor toppings and the approved samples are to match in color and texture.

1.6 WARRANTY

Submit a [2] [_____] year written warranty for all materials and installation work.

PART 2 PRODUCTS

2.1 SYSTEM DESCRIPTION

NOTE: Thi n- set , heavy- dut y, t r owel ed f l oor t oppi ng i s a mi xt ur e of a t wo- component epoxy- r esi n bi nder and a bl end of sever al s i zes of pr egr aded aggr egat e. Cl ear l y desi gnat e on dr awi ngs ar eas of application.

SECTION 09 67 23.13 Page 7

NOTE: Del et e t he second par agr aph f or pr oj ect s whi ch ar e cast compl et el y on si t e. I ncl ude t he second par agr aph f or pr oj ect s r equi r i ng f act or y assembl y pr i or t o s i t e del i ver y.

Submit installation drawings for heavy duty epoxy flooring systems clearly designating the areas of application and the installation plan. Include in the installation plan, methods to control sand and dust if sand blasting is required.

[ Submit fabrication drawings for heavy duty epoxy flooring Systems consisting of fabrication and assembly details to be performed in the factory.

] 2.2 MATERIALS

2.2.1 Mixes

2.2.1.1 Epoxy-Resin Binder/Matrix

Provide a clear two-component compatible system epoxy resin binder consisting of: (1) a liquid blend of a biphenyl-based epoxy resin and an aliphatic polyglyceride ether, and (2) a liquid blend of two modified amine curing agents, which individually cures the epoxy resin at room temperature to a glossy smooth film. Ensure the two components and the cured epoxy binder have the following physical properties:

PROPERTY TEST METHOD REQUIREMENT

COMPONENT A (EPOXY RESIN)

Viscosity (kinematic), at 25 degrees C, millipascal-second

ASTM D445 3000 to 5000

Weight per epoxide, grams ASTM D1652 205 to 225

Color (Gardner Color Scale), maximum

ASTM D1544 5

Weight per milliliter, grams ASTM D1475 1.13 - 1.15

COMPONENT B (CURING AGENT)

Viscosity (kinematic), at 25 degrees C, square milliliter per second

ASTM D445 75 to 125

Weight per milliliter, grams ASTM D1475 0.90 to 0.91

SECTION 09 67 23.13 Page 8

PROPERTY TEST METHOD REQUIREMENT

Color (Gardner Color Scale), maximum

ASTM D1544 8

PROPERTY TEST METHOD REQUIREMENT

COMPONENT A (EPOXY RESIN)

Viscosity (kinematic), at 77 degrees F, centipoises

ASTM D445 3000 to 5000

Weight per epoxide, grams ASTM D1652 205 to 225

Color (Gardner Color Scale), maximum

ASTM D1544 5

Weight per gallon, pounds ASTM D1475 9.46 - 9.56

COMPONENT B (CURING AGENT)

Viscosity (kinematic), at 77 degrees F, centistokes

ASTM D445 75 to 125

Weight per gallon, pounds ASTM D1475 7.50 to 7.60

Color (Gardner Color Scale), maximum

ASTM D1544 8

2.2.1.2 Cured Epoxy Binder

Provide a cured epoxy binder with the following properties.

PROPERTY TEST METHOD REQUIREMENT

Water absorption, percent 24 hours at 25 degrees C, maximum

ASTM D570 0.40

Hardness, Shore D ASTM D2240 74 to 82

Linear shrinkage, millimeter/millimeter, maximum

ASTM C881/C881M 0.15

Shrinkage, glass bow, milli-meter divergence, maximum

ASTM A990/A990M 0.40

Coefficient of linear thermal expansion, mm/mm/degrees C, maximum

ASTM D696

0 degrees C to 40 degrees C

200 X 10-6

SECTION 09 67 23.13 Page 9

PROPERTY TEST METHOD REQUIREMENT

Gel time/peak exotherm at 25 degrees C, 100 gm mass in 120 millimeter metal container

ASTM D2471 20 to 40 minutes at 150 degrees C, maximum

*3 millimeter thick castings

**3 by 25 by 80 millimeter castings, aged in forced draft oven

PROPERTY TEST METHOD REQUIREMENT

Tensile strength, psi* at test temperature:

77 degrees F

ASTM D638 4500 to 6500

Tensile elongation, percent* at test temperature: 77 degrees F

ASTM D638 20 to 40

Water absorption, percent 24 hours at 77 degrees F, maximum

ASTM D570 0.40

Hardness, Shore D ASTM D2240 74 to 82

Linear shrinkage, inch/inch maximum

ASTM C881/C881M 0.006

Shrinkage, glass bow, inch divergence, maximum

ASTM A990/A990M 0.016

Coefficient of linear thermal expansion, inch/inch/degree C, maximum

ASTM D696

0 degrees C to 40 degrees C

200 X 10-6

Gel time/peak exotherm at 77 degrees F, 100 gm mass in 4-ounce metal container

ASTM D2471 20 to 40 minutes at 300 degrees F, maximum

*1/8 inch thick castings

**1/8 by 1 by 3 inch castings, aged in forced draft oven

[ 2.2.1.3 Aggregate

Provide aggregate recommended by the resinous flooring manufacturer and approved by the Contracting Officer. Deliver aggregate to the site in three separate package gradations for blending. Gradations are:

SECTION 09 67 23.13 Page 10

PERCENT

SIEVE SIZE MAXIMUM MINIMUM

GRADUATION NO. 1

Retained on 3.35 millimeter 0.0 -

Passing 3.35 millimeter, retained on 2.36 millimeter

5.0 0.0

Passing 2.36 millimeter, retained on 1.7 millimeter

100.0 74.0

Passing 850 micrometer 1.0 -

GRADATION NO. 2

Retained on 1.18 millimeter 0.0 -

Passing 1.18 millimeter, retained on 1.0 millimeter

5.0 0.0

Passing 1.0 millimeter, retained on 425 micrometer

100.0 85.0

Passing 425 micrometer, retained on 250 micrometer

9.0 0.0

Passing 250 micrometer 1.0 -

GRADATION NO. 3

Retained on 850 micrometer 0.0 -

Passing 850 micrometer, retained on 500 micrometer

5.0 0.0

Passing 500 micrometer, retained on 250 micrometer

100.0 80.0

Passing 250 micrometer, retained on 150 micrometer

13.0 0.0

Passing 150 micrometer 2.0 -

PERCENT

SIEVE SIZE MAXIMUM MINIMUM

GRADUATION NO. 1

Retained on No. 6 0.0 -

Passing No. 6, retained on No. 8 5.0 0.0

Passing No. 8, retained on No. 12 100.0 74.0

SECTION 09 67 23.13 Page 11

PERCENT

SIEVE SIZE MAXIMUM MINIMUM

Passing No. 20 1.0 -

GRADATION NO. 2

Retained on No. 16 0.0 -

Passing No. 16, retained on No. 18 5.0 0.0

Passing No. 18, retained on No. 40 100.0 85.0

Passing No. 40, retained on No. 60 9.0 0.0

Passing No. 60 1.0 -

GRADATION NO. 3

Retained on No. 20 0.0 -

Passing No. 20, retained on No. 35 5.0 0.0

Passing No. 35, retained on No. 60 100.0 80.0

Passing No. 60, retained on No. 100 13.0 0.0

Passing No. 100 2.0 -

] 2.2.1.4 Surface Sealing Coat

NOTE: Gl ossy f i nal f i ni shes may cause a s l i p hazar d under r oom condi t i ons when exposed t o wat er or oi l y l ubr i cant s, par t i cul ar l y i n var i ous l abs or mai nt enance ar eas. Speci f y t he t ype of f i nal f i ni sh desi r ed and t he mat er i al r equi r ed ( gr i t ) t o be added t o pr event s l i p hazar ds.

Provide nonambering aliphatic or aromatic moisture-curing polyurethane surface sealer into which has been incorporated a flatting agent. Add flatting agent not more than 24 hours prior to actual application of the coating. Ensure cured coating with flatting agent yields 60-degree specular gloss of 10 to 20 when tested in accordance with ASTM D523.

PART 3 EXECUTION

3.1 PREPARATION

Prior to applying resinous flooring material, inspect substrate and immediately report any unsatisfactory conditions that exist and repair.

SECTION 09 67 23.13 Page 12

3.1.1 Safety Precautions

Prior to application in confined spaces of toppings and coatings containing flammable or toxic properties, institute safety precautions recommended by the manufacturer of the product.

Erect "NO SMOKING" signs, and prohibit smoking or use of spark- or flame-producing devices within 15 meter 50 feet of any mixing or placing operation involving flammable materials.

Provide personnel required to handle, mix, or apply toppings containing toxic or flammable properties with such items of personal protective equipment and apparel for eye, skin, and respiratory protection as are recommended by the manufacturer of the product. Ensure all personnel are trained in the appropriate use and wearing of personal protection equipment.

3.1.2 Protection of Adjacent Surfaces

In addition to the protection of adjacent surfaces during installation, provide areas used to store and mix materials with a protective covering under the materials. After application of the sealer coats, protect finished flooring during the remainder of the construction period. In areas of expected minimum or moderate traffic, cover floors with[ 12300 newton per meter 70-pound kraft paper][ a 30-30-30 waterproof kraft paper][_____], with strips taped together and edges secured to prevent roll-up. Place vegetable fiberboard, plywood, or other suitable material that does not mar the flooring over the paper to protect areas used as passages by workmen and areas subject to floor damage because of subsequent building operations. Upon completion of construction, remove the protection, clean flooring and, where necessary, repair, reseal, or both, at no additional cost to the Government.

3.1.3 Concrete Subfloor

[ 3.1.3.1 New Concrete Floors

Do not commence installation of floor topping until concrete has cured a minimum of 28 calendar days. Verify concrete floor is straight, properly sloped, and has [rough] [broom] [wooden float] type finish. Ensure concrete is moist cured with burlap or polyethylene. Prior to applying the prime coat, clean concrete surface by an approved method.

][ 3.1.3.2 Existing Concrete Floors

Clean existing concrete floors, with hard troweled or contaminated areas in conformance with ASTM D4259, and ensure concrete is free of all paint, sealers, curing agents, oil, grease, moisture, dirt or any other contaminants. Remove any loose or corroded segments of existing concrete and patch with a grouting compound as recommended by the resinous flooring manufacturer. Fill all cracks with an elastomeric jointing compound compatible with the resinous flooring system used.

] [ 3.1.4 Steel Subfloor

Clean surfaces of grease, rust, and mill scale by dry sand blasting in accordance with SSPC SP 6/NACE No.3 for commercial sand blasting. Prime all surfaces with a primer as recommended by the resinous flooring manufacturer, the same day or before there are any visible signs of

SECTION 09 67 23.13 Page 13 oxidation, which ever is sooner. Using other means of surface preparation is optional, as approved by the Contracting Officer, provided the degree of cleanliness and profile obtained by sand blasting is equaled. Power brushing is not permitted.

] 3.1.5 Mixing Of Materials

NOTE: Mi xt ur es pr ovi di ng sat i sf act or y densi t y, t r owel abi l i t y , and sur f ace t ext ur e ar e af f ect ed by var i at i ons i n par t i c l e shapes, s i zes, and si ze distribution.

Select job mix proportions on the trial batch proportions used to prepare the floor topping samples as submitted and approved.

Use mechanical equipment for mixing of materials in accordance with the manufacturer's instructions.

Use rotating paddle-type masonry mortar mixers for preblending the three sizes and color pigment, if any, of the walnut shell aggregate and addition of the mixed epoxy resin binder. Ensure mixing times are as recommended by the materials supplier(s), provided mixing times result in homogeneous mixtures. Limit quantity of material mixed at one time to that which can be applied and finished within the working life of the mixtures. Verify temperature of materials at the time of mixing are between 18 and 30 degrees C 65 and 85 degrees F .

3.2 APPLICATION

3.2.1 Areas of Application

Anchor plates set with the top surface at or above the finished epoxy floor level do not require coverage with this flooring material. Extend flooring under equipment, except when the equipment base is indicated to be flush against the structural floor. Cover and/or mask surfaces not to receive the epoxy floor topping, such as equipment or cabinets installed prior to surface-preparation efforts and adjacent to the flooring installation.

3.2.2 Application of Prime Coat and Troweling

Combine the epoxy binder components A and B in the proportions specified by the manufacturer to form a clear compatible system immediately on mixing. Cure combined components to a clear film possessing a glossy, non-greasy surface at relative humidities less than 80 percent, having the following properties after curing 24 hours at 25 degrees C 77 degrees F , followed by 24 hours at 52 degrees C 125 degrees F :

Ensure prepared subfloor surface is dry and at a temperature of not less than 16 degrees C 60 degrees F when application of the floor topping is initiated. Immediately prior to application of the prime/scratch coat on the prepared surface, remove dust or other loose particles by blowing with compressed air or vacuum cleaned. Use only an air compressor equipped with an efficient oil-water trap to prevent oil contamination or wetting of surface.

Apply a thin roller coat of the epoxy binder specified to the prepared

SECTION 09 67 23.13 Page 14 subfloor as a prime coat. As an aid to placing, compacting, and finishing the floor topping, form a scratch coat by sprinkling a minimum quantity of the walnut shell aggregate on the prime coat surface immediately following the prime coat application. Prior to application of the prime/scratch coat, fill cracks in the concrete, and make provisions to keep control or expansion joints open.

Place the floor topping prior to final gelling of the prime/scratch coat.

Immediately after the materials are mixed as specified, dump the mixture in the placement area and spread to prolong troweling life. Screed or rough trowel placed materials to the specified thickness and then compact by the use of a smooth roller prior to finish troweling to a nominal thickness of 4.7 millimeter plus or minus 1.58 millimeter 3/16-inch plus or minus 1/16-inch . Ensure all finished surfaces are free of ridges, hollows (bird-baths), trowel marks, and smoothness varies no more than 3 millimeter 1/8-inch when tested with an 2500 millimeter 8-foot straightedge. Make provisions to maintain the work areas in a relatively dust-free environment during curing of the topping.

3.2.3 Sealer Coat

After the floor topping has set firmly (approximately 6 to 16 hours depending on subfloor temperature) in a relatively dust-free environment, apply two thin coats of the sealer coat, by means of brush, roller, squeegee, or notched trowel to provide a pore-free, easy-to-clean surface. At the time of sealer application, ensure the surface is dust-free. Depending on relative humidity, allow the applied sealer to cure to a tack-free condition in 2 to 4 hours. Do not apply second coat until after the initial coat has cured to a tack-free, hard film.

Maintain topping areas in a relatively dust-free environment during curing of the sealer coats.

[ 3.2.4 Integral Cove Base

NOTE: Use t he f ol l owi ng par agr aph i f pr oj ect r equi r es an i nt egr al cove base.

Provide a [10.16] [_____] cm [4] [_____]-inch high cove base to all wall surfaces as indicated on the drawings. Install so as to provide a [1.27] [_____] cm [1/2] [_____]-inch radius at the juncture of the floor and the wall.

] 3.3 FIELD QUALITY CONTROL

3.3.1 Repairing

Remove and replace damaged or unacceptable portions of completed work with new work to match adjacent surfaces at no additional cost to the Government.

3.4 ADJUSTING AND CLEANING

Clean surfaces of the new work, and adjacent surfaces soiled as a result

SECTION 09 67 23.13 Page 15 of the work. Remove all equipment, surplus materials, and rubbish associated with the work from the site.

-- End of Section --

SECTION 09 67 23.13 Page 16