Specification for Producing a Skid-Resistant Surface on Concrete by the Use of Epoxy and Aggregate (ACI 503.3-10)

Description

Concrete surfaces to which epoxies are to be appliedshall be newly prepared substrate free of loose and unsoundmaterials and contamination that affect cure or adhesion ofepoxy. Prepare surfaces by mechanical abrasion.

3.1.2Mechanical abrasion—Use abrasive blasting, shot-blasting, or other approved means.3.2—Evaluate surface before coating application3.2.1Evaluate all prepared concrete surfaces before applica-tion of coating to ensure that requirements of Article 3.2 are met

.3.2.2 Tensile strength of concrete surface shall have anaverage minimum pulloff strength of 250 psi in accordancewith ASTM C1583.3.2.2.1 Apply test patches of the skid-resistant coating toprepared concrete surfaces at the rate of one per span or4305 ft2, whichever is smaller. An evaluation shall be theaverage of three individual tests at each test patch location.

3.2.2.2 The tensile adhesion evaluation shall not beperformed at surface temperatures above 80°F.

3.2.2.3 Tests should be repeated when results are not afailure of concrete in 50% or more of the test area. Repeatedfailures in adhesion, or cohesion in adhesive, indicateimproper cleaning of concrete, incorrect adhesive, or faultyadhesive application techniques.

3.2.2.4 If test strength is less than 250 psi after severaltests, the following options are recommended, unless other-wise specified:•Additional surface preparation.•Do not place overlay.•Replace concrete.•Use an alternative system.

3.2.3 The surface shall be free of any deleterious materialssuch as laitance, curing compounds, dust, dirt, and oil, andmaterials resulting from surface preparation, as specified inArticle 3.1, shall be removed.3.2.4 All concrete surfaces shall be dry as defined inParagraph

3.2.5 unless a water-insensitive coating is used.Surface temperature shall be at least 55°F to permit wettingof the concrete surface by epoxy coating, unless otherwisespecified or recommended by manufacturer.