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I <br /> Iat 24 hours C 39 Minimum 5,000 psi <br /> Length Change <br /> I at 28 days C 157 0.15 percent maximum <br /> Total Chloride Ion Content C 1218 1 lb/yd3 maximum <br /> Bond Strength <br /> I at 24 hours C 882 (As modified by C Minimum 1,000 psi <br /> 928, Section 9.5) <br /> Scaling Resistance (at 25 C 672 (As modified by C 1 lb/ft2 maximum <br /> cycles of freezing and 928, Section 9.4) <br /> I1 thawing) <br /> 2 9-20.1(2) Patching Mortar Extended with Aggregate <br /> I 3 Patching mortar extended with aggregate shall meet the following requirements: <br /> 4 <br /> Compressive Strength ASTM Test Method Specification <br /> I at 3 hours C 39 Minimum 3,000 psi <br /> at 24 hours C 39 Minimum 5,000 psi <br /> Length Change <br /> I at 28 days C 157 0.15 percent maximum <br /> Bond Strength <br /> at 24 hours C 882 (As modified by Minimum 1,000 psi <br /> I ASTM C928, Section 9.5) <br /> Scaling Resistance (at 25 C 672 2 Maximum Visual Rating <br /> cycles of freezing and <br /> I thawing) <br /> Freeze thaw C 666 Maximum expansion 0.10% <br /> Minimum durability 90.0% <br /> I 5 <br /> 6 9-20.1(3) Aggregate <br /> 7 Aggregate used to extend the patching mortar shall conform to Section 9-03.1(4) <br /> 8 and be AASHTO Grading No. 8. A Manufacturer's Certificate of Compliance shall be <br /> I9 submitted showing the aggregate source and the gradation. Mitigation for Alkali <br /> 10 Silica Reaction (ASR) will not be required for the extender aggregate used for <br /> 11 concrete patching material. <br /> I 12 <br /> 13 9-20.1(4) Water <br /> 14 Water shall meet the requirements of Section 9-25.1. The quantity of water shall be <br /> I 15 within the limits recommended by the repair material manufacturer. <br /> 16 <br /> 17 9-20.2 Specifications <br /> I 18 This section, including title, is revised to read: <br /> 19 <br /> 20 9-20.2 Patching Material for Concrete Structure Repair <br /> I 21 Concrete patching material shall be a prepackaged mixture of portland or blended <br /> 22 hydraulic cement, aggregate, and admixtures. Fly ash, ground granulated blast furnace <br /> 23 slag and microsilica fume may be used. The concrete patching material may be shrinkage <br /> 24 compensated. The concrete patching material shall also meet the following requirements: <br /> 25 <br /> 26 • Compressive strength of 6000 psi or higher at 28 days in accordance with <br /> 27 AASHTO T 22 (ASTM C 39), unless noted otherwise <br />