SECTION 521: NON-SHRINK GROUT
521.1 Description
This Work consists of providi ng and placing non-shrink grout f or use in concrete Structures. Uses of grout include the following: 1. Filling under masonry plates and blockouts between precast m embers; 2. Bonding cementitious dowel bars in preformed recesses; 3. Filling shear keys between Bridge members; and 4. Other uses as required. For Concrete Structure surface repairs, see Section 533, “Concr ete Structure Repair.”
521.2 Materials
The Contractor shall provide prepackaged nonshrink hydraulic-ce ment grout (“grout”) in accordance with Table 521.2:1, “Enriched Mortar Physical Proper ty Requirements.” The Contractor shall select the grout from the Department’s Approved Products List . The grout shall be nonmetallic, water-based and cannot contain chlorides, fluorides, sulfites, nitrates, or gas-forming agents. Table 521.2:1 Enriched Mortar Physical Property Requirements Property ASTM Test Requirements Compressive strength, minimum C-1107 Stiff 3 day - 4000 (psi) 7 day - 5000 28 day - 8000 Flowable 3 day - 3000 7 day - 3500 28 day - 5000 Hardened Grout Height Change C-827 Maximum 0.6% Pull-out Strength E-488 20,000 lbf The Contractor shall provide water in accordance with Section 5 09.2.6, “Water.”
521.3 Construction Requirements
The Contractor shall use non-shrink grout in accordance with th e manufacturer’s recommendations and instructions regarding proportioning, mixin g, maximum water content, application, curing temperat ures, and curing conditions. If manufacturer’s recommendations conflict with this Section, the ma nufacturer’s recommendations shall govern.
521.3.1 Placing, Finishing, and Curing
The Contractor shall clean concrete areas of loose or Deleterio us Material that would prevent a bond between the grout and the base concrete surfaces . The Contractor shall flush Section 521: Non-Shrink Grout Page 433 areas with water and let dry to a surface dry condition immedia tely before placing the grout. The Contractor shall ensure that the grout completely fills rec esses and holes, voids under structural members, and at other specified locations. Th e Contractor shall screed the Material to the specified level, and finish the surface to the specified texture.
521.3.2 Curing
After placing, the Contractor shall cure surfaces of grout in a ccordance with the manufacturer’s recommendations. If the manufacturer recommenda tions are not specific, cure surfaces in accordance with Sec tion 511.3.9.1, “Method 1, Water Curing.”
521.3.2 1 Temperature Requirements
The Contractor shall place grout when the air temperature is at least 45 °F, but less than 95 °F. The Contractor shall not allow the grout temperature to rise above 85 °F during mixing and placing. The Contractor shall maintain the temperature of the grout at o r above 45 °F during the curing period.
521.3.3 Elapsed Time Before Loading
The Contractor shall not allow loads on grout that has been in place less than 72 hours, or as recommended by the manufacturer, unless otherwise directe d by the Project Manager.
521.3.4 Grout Defects
The Contractor shall remove and replace improperly cured or oth erwise defective grout.
521.4 METHOD OF MEASUREMENT - Reserved
521.5 Basis of Payment
521.5.1 Work Included In Payment
The Department considers providing, placing, and curing of non- shrink grout Incidental to the completion of the Work and will not measure or pay for it s eparately. Section 522: Chemical Adhesive Anchors Page 434