536EPOXY COATING FOR CONCRETE

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of furnishing and placing on concrete surfaces as shown on the plans a flexible, minimum two -coat,

epoxy coating system consisting of a mortar coat and one or more seal coats. The resulting color shall be approximately the shade of hardened concrete. Materials

2.1Epoxy coating shall be an epoxy compound and shall be furnished in two components for combining immediately prior to

use in accordance with the stipulations in this specification. The epoxy coating system shall be a product approved by the Engineer. 2.1.1 The material for the mortar coat shall consist of 100 percent solids. The Component “ A” shall be an epoxy resin containing a t hixotropic agent. The Component “ B” (Hardener) shall be chemically pure amido -amine or poly -amide with no other fillers, diluents or wettings, or volatile solvents. Sand shall be used in the mortar coat. The proportion of sand in the epoxy mortar shall be as recommended by the manufacturer. The two components of the epoxy system furnished under this specification shall be supplied in separate pre-proportioned containers. A unit of Component “ A” shall be supplied in a container with enough capacity to allow the mixing in it of the Component “ B”, together with the sand for the mortar coat. 2.1.2 The material for the seal coat shall consist of a pigmented, solvent-cut two-component epoxy polyamide. The color shall be concrete gray. 2.1.3 Containers shall be identified as “ Component A, Contains Epoxy Resin” and “ Component B, Contains Hardener”. Labels shall show the component type, whether trowel grade or brush grade, mixing directions, and usable temperature range, all as defined by this specification. Each container shall be marked with the name of the manufacturer, the lot or batch number, the date of packaging, pigmentation, if any, and the quantity contained therein in pounds and gallons. 2.1.4 At 70 °F, the mortar grade shall have a pot life of at least 45 minutes and the brush grade shall have a pot life of at least 8 hours. 2.1.5 The epoxy shall be formulated for application at a temperature of 40 °F and above. 2.1.6 Storage. The Components A and B should be stored in a cool place in warm weather and a warm place in cold weather.

2.2Sand for mortar coat shall be Ottawa silica sand, or an approved equivalent, which will closely approximate the color of

concrete. The sand shall be so graded that 100 percent by weight will pass a No. 4 sieve, 20 to 30 percent will pass a No. 50 sieve and 0 to 5 percent will pass a No. 100 sieve. 2.2.1 Sand shall be furnished on the project as a pre-dried product in moisture-proof containers. Construction Requirements

3.1Preparation and surfaces. Acid etching will not be allowed. Surfaces of concrete shall not be “ finished” but shall be

sandblast cleaned before applying the first coat, not only to remove all film or laitance, but also to remove the surface of the concrete deep enough to eliminate any formation over voids. The object is to obtain a durable concrete surface. The area to be treated must be surface-dry, and all dust and sand residue from blast cleaning shall be removed. The temperature of the concrete shall be 40 °F or above. Concrete shall be cured a minimum of 14 days, before coating is applied.

3.2Mixing. Mixing of the epoxy shall be done immediately prior to use and strictly in accordance with the manufacturer’s

directions shown on the container. The epoxy resin and hardener shall be mixed the specified time using an approved propeller - type stirrer designed for the quantity to be mixed. For the mortar coat, after the 2 components have been thoroughly mixed, sand shall be added strictly in the proportion ordered, and mixing shall be continued until a homogeneous mixture has been obtained.

3.3Applications.

3.3.1 Mortar coat. The epoxy and sand mixture shall be applied with a screed or trowel to completely fill all cavities or imperfections present in the concrete. Depending upon the particular brand used and the quality of the concrete surface, to cover 30 ft2 of area with the trowel coat may require approximately 1 gal of the mixture. 3.3.2 Seal coat. After the mortar coat has hardened, the seal coat shall be applied as soon as possible using a brush or roller in the manner recommended by the manufacturer and taking extreme care to fill all pinholes or other voids which may exist in the underlying coat. It is estimated that to cover approximately 200 ft2 of surface will require 1 gal of epoxy seal coat. 3.3.3 In case adequate coverage has not been obtained, one or more additional coats may be ordered.

3.4Safety precautions. Proper protective equipment shall be used and other actions shall be taken against the possibility of

skin damage to humans and against the possibility of fire, since the material may be a dermatitis producer and a fire hazard.

New Hampshire Department of Transportation Standard Specifications – 2016 Method or Measurement

4.1Epoxy coating of the type specified will not be measured, but shall be the square foot final pay quantity in accordance with

109.11for the coated surface required within the limits shown on the plans

Basis of Payment

5.1Epoxy coating of the type specified is a final pay quantity item and will be paid for at the Contract unit price per square foot

complete in place in accordance with 109.11. Pay items and units:

536.11Epoxy Coating for Concrete (F) Square Foot

. . .

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of furnishing and applying an approved waterproof membrane system as shown on the plans or as

ordered.

1.2When “Barrier Membrane, Heat Welded ” or “ Barrier Membrane, Heat Welded – Machine Method ” is specified, the

Contractor shall arrange for a manufacturer’s representative (Representative) to be present at all times work is performed, including application of the primer and tack coat. The Representative shall also be present for placement of the hot bituminous pavemen t overlay. The Rep resentative shall be readily identified by a photo ID badge, issued by the manufacturer, that includes the manufacturer’s name and logo, a current photograph of the Representative, the Representative’s full name, and the word “ Representative”. The text o f the badge shall be clearly printed in English. The Representative shall have the badge on his/her person and available for inspection at all times work is performed under this specification. 1.2.1 In performing work under this specification, the Contr actor shall anticipate and provide for quality assurance testing and inspection by the Engineer or his/her authorized representatives. 1.2.2 When” Barrier Membrane, Heat Welded – Machine Method” is specified, the machine shall meet the requirements of 538.3.3.3.1. Materials

Barrier membrane, Peel and Stick.

2.1.1 “ Barrier membrane, Peel and Stick” and “ Barrier membrane, Peel and Stick – Vertical Surfaces” shall consist of adhesive primer, preformed waterproofing membrane sheet and mastic all as one system as included on the Qualified Products List.

Protection board shall be a product as included on the Qualified Products List.

2.3Barrier Membrane, Heat Welded.

2.3.1 “Barrier Membrane, Heat Welded ” shall consist of an approved prefabricated reinforcement of synthetic non -woven material, thoroughly impregnated and coated with SBS modified bitumen as included on the Qualified Products List. When machine method is specified, the membrane system shall be listed as such on the Qualified Products List. 2.3.2 The system shall include a primer that enhances the adhesive bond between the concrete deck and the membrane, and a tack coat that enhances the bond between the membrane and the hot bituminous pavement overlay , all as included on the Qualified Products List. 2.3.2.1 When approved in writing by the membrane manufacturer, a tack coat meeting the requirements of 410.2.1 may be used in lieu of the tack coat that is listed on the Qualified Products List. 2.3.3 Hot-applied rubberized asphalt for sealing the curb line shall be a product as included on the Qualified Products List. Construction Requirements

General.

3.1.1 Concrete shall be cured in accordance with the requirements of 520.3.10. The prime r and membrane shall only be applied when the substrate surface has a moisture content of 6 percent or less, and when the temperature of the substrate exceeds the dew point by at least 5º F. The Contractor shall supply a portable electronic surface moistu re meter capable of measuring the moisture content of concrete surfaces in percent. The moisture meter shall be a product that is listed on the Qualified Products List and shall be calibrated annually by the meter manufacturer. A certificate of calibration from the meter manufacturer shall accompany the moisture meter. The Contractor shall also supply a digital weather instrument that can measure both ambient temperature and dew point, and an infrared surface temperature measuring instrument. 3.1.2 The air temperature and the substrate temperature shall be at least 40 ºF and rising.

Barrier Membrane – Peel and Stick.

3.2.1 Preparation of the surface. The concrete surface shall have a uniform, fine-textured finish that is free of protrusions. All honeycombed areas and surface cavities shall be cleaned and filled with approved patching materials. The surface to be membraned shall be clean and free of laitance, oil and foreign materials. 3.2.2 Application of adhesive primer. Immediately prior to application of the primer, the surface shall be cleaned by brooms and compressed air. The concrete surface shall be inspected and approved by the Engineer prior to priming. 3.2.2.1 The adhesive primer shall be thoroughly mixed before use and applied by roller only and allowed to cure in accordance with the manufacturer’s recommendations.