1019PENETRATING SEALERS FOR REINFORCED CONCRETE SURFACES

SURFACES

1019.1DESCRIPTION —This work is the surface preparation and application of penetrating sealers or

boiled linseed oil on reinforced concrete surfaces.

1019.2MATERIAL—

Certify as specified in Section 106.03(b)3.

sealer from a manufacturer listed in Bulletin 15, as follows:

• Silicates in Water.

• Epoxies Dispersed in Water. Only use on surfaces that the sealer does not totally encapsulate the structural unit being treated.

• Organo-Silicon Compounds in Solvent.

• Resins in Mineral Spirits.

Certify as specified in Section 106.03(b)3.

penetrating sealer from a manufacturer listed in Bulletin 15 , composed of a minimum of 40% silane or siloxane material, with no petroleum distillates meeting the following properties:

• Water Absorption. The water absorption of the treated concrete under total immersion cannot exceed 1.0% after 48 hours and 2.0% after 50 days according to ASTM C642 as modified below for concrete. The final average percent water absorbed, for concrete sealed with the penetrating sealer cannot be greater than 20.0% of the final average percent water absorbed by the uncoated reference concrete.

Table A Water Absorption – Independent Laboratory Testing or PennDOT’s MTL Test Standard/Method Accepted Result and Comment Water Absorption ASTM C642 1.0 % at 48 hours and 2.0% at 50 days AASHTO T 384 80.0% reduction (150-200 sf/gal)

• Moisture Vapor Transmission. The final average percent moisture loss, for concrete coated with the protective sealer, cannot be less than 80.0% of its final average percent water absorption.

Table B Moisture Vapor Transmission - Independent Laboratory Testing or PennDOT’s MTL Test Standard/Method Accepted Result and Comment Moisture Vapor Transmission AASHTO T 384 ≥ 80.0%

• ChlorideIon Penetration. The final average absorbed chlorideion content, for concrete coated with the protective sealer, cannot be greater than 15.0% of the final average absorbed chlorideion content of the uncoated reference concrete.

Table C ChlorideIon Penetration - Independent Laboratory Testing or PennDOT’s MTL Test Standard/Method Accepted Result and Comment ChlorideIon Penetration AASHTO T 259/260 ≤ 0.80lb/yd3 at 0.5-1.0-inch depth after 90 days of ponding

• Scaling Resistance. Water/cement ratio between 0.40 to 0.50, minimum 4 ,000 pounds per square inch compressive strength, and 6 -8% air entrained. Revise ASTM C672/672M to measure the mass loss every 5 cycles.

Table D Scaling Resistance - Independent Laboratory Testing or PennDOT’s MTL Test Standard/Method Accepted Result and Comment Scaling Resistance ASTM C672/C672 M-03 Rating 0 at 25 cycles (maximum of 3 at 50 cycles, failure criteria 0.1 lb/ft2 mass loss after 50 cycles)

• Skid Resistance. Penetrating sealers cannot reduce the skid resistance of the concrete wearing surface.

Table E Skid Resistance - Independent Laboratory Testing or PennDOT’s MTL Test Standard/Method Accepted Result and Comment Skid Resistance ASTM E274 Coefficient of friction ≥90% of the untreated specimen

• Depth of Penetration.

Table F Depth of Penetration - Independent Laboratory Testing or PennDOT’s MTL Test Standard/Method Accepted Result and Comment Depth of Penetration PDS (product data sheet) ≥ 0.15 inch

• Durability. The penetrating sealer cannot show any signs of weathering, discoloration, or deterioration after 6 months of exposure to atmospheric conditions.

Certify as specified in Section 106.03(b)3.

1019.3CONSTRUCTION—

1.a General. Thoroughly clean the surfaces of dirt, debris, oil, grease, and foreign matter that would prevent penetrating sealer, adhesion, or drying. Do not use membrane -forming curing compound where linseed oil treatment is to be applied. Apply the penetrating sealer as soon as possible after completion of a structure or portion of a structure.

hydrocarbons, water blasting equipment with a minimum rated capacity of 5,000 pounds per square inch, a low-pressure sprayer with 0.1 gallons per minute at 25 pounds per square inch or less, and brooms or notched squeegees to spread sealant evenly. The use of a spray bar and several nozzles is the ideal application technique.

data sheet (PDS). Clear the surface of all loose particles. Utilize a detergent that has been approved by the sealer manufacturer to remove any visible hydrocarbons from the surface. Pressure wash all surfaces to be sealed with a minimum 3,600 pounds per square inch at a rate of 6 gallons per minute. Prevent damage to the concrete surface . Thoroughly clean the surfaces of dirt, debris, oil, grease, and foreign matter that would prevent protective coating penetration, adhesion, or drying and according to the manufacturer’s PDS. Ensure that the surface is dry and free of defects before applying the product.

mixing equipment, mixing procedures, mixing time, storage conditions, recoat times and temperatures, as well as PDS to the Engineer at least 5 days before applying the sealer. Employ overlapping passes with a low-pressure sprayer to completely wet the surface. Adjust the pressure or the nozzles to avoid an atomized spray. Keep standoff distance under 6 inches. Do not discolor the concrete during sealer application. Apply sealer when t he air and surface temperatures are according to the manufacturer’s PDS. Do not apply i f there is ice or frost. Do not apply if rain is forecasted within 4 hours of completing.

1019.4MEASUREMENT AND PAYMENT—Square Yard

For the type indicated.