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DocuSign Envelope ID: 313DA256 -1EDE- 4396- A716- 4C53B809027E <br />JERRY M. PASSMORE CENTER ADDITION AND RENOVATION <br />HILLSBOROUGH, NORTH CAROLINA <br />4. Apply liquid until surface is saturated, scrubbing into surface until a gel forms; rewet; and <br />repeat brooming or scrubbing. Rinse with water; remove excess material until surface is dry. <br />Apply a second coat in a similar manner if surface is rough or porous. <br />3.13 JOINT FILLING <br />A. Prepare, clean, and install joint filler according to manufacturer's written instructions. <br />1. Defer joint filling until concrete has aged at least six months. Do not fill joints until construction <br />traffic has permanently ceased. <br />B. Remove dirt, debris, saw cuttings, curing compounds, and sealers from joints; leave contact faces of <br />joint clean and dry. <br />C. Install semirigid epoxy joint filler full depth in saw -cut joints and at least 2 inches deep in formed <br />joints. Overfill joint and trim joint filler flush with top of joint after hardening. <br />3.14 CONCRETE SURFACE REPAIRS <br />A. Defective Concrete: Repair and patch defective areas when approved by Architect. Remove and <br />replace concrete that cannot be repaired and patched to Architect's approval. <br />B. Patching Mortar: Mix dry -pack patching mortar, consisting of one part portland cement to two and <br />one -half parts fine aggregate passing a No. 16 sieve, using only enough water for handling and <br />placing. <br />C. Repairing Formed Surfaces: Surface defects include color and texture irregularities, cracks, spalls, <br />air bubbles, honeycombs, rock pockets, fins and other projections on the surface, and stains and <br />other discolorations that cannot be removed by cleaning. <br />1. Immediately after form removal, cut out honeycombs, rock pockets, and voids more than 1/2 <br />inch in any dimension in solid concrete but not less than 1 inch in depth. Make edges of cuts <br />perpendicular to concrete surface. Clean, dampen with water, and brush -coat holes and voids <br />with bonding agent. Fill and compact with patching mortar before bonding agent has dried. Fill <br />form -tie voids with patching mortar or cone plugs secured in place with bonding agent. <br />2. Repair defects on surfaces exposed to view by blending white portland cement and standard <br />portland cement so that, when dry, patching mortar will match surrounding color. Patch a test <br />area at inconspicuous locations to verify mixture and color match before proceeding with <br />patching. Compact mortar in place and strike off slightly higher than surrounding surface. <br />3. Repair defects on concealed formed surfaces that affect concrete's durability and structural <br />performance as determined by Architect. <br />D. Repairing Unformed Surfaces: Test unformed surfaces, such as floors and slabs, for finish and <br />verify surface tolerances specified for each surface. Correct low and high areas. Test surfaces sloped <br />to drain for trueness of slope and smoothness; use a sloped template. <br />1. Repair finished surfaces containing defects. Surface defects include spalls, popouts, <br />honeycombs, rock pockets, crazing and cracks in excess of 0.01 inch wide or that penetrate to <br />reinforcement or completely through unreinforced sections regardless of width, and other <br />objectionable conditions. <br />2. After concrete has cured at least 14 days, correct high areas by grinding. <br />CAST -IN-PLACE CONCRETE 033000-15 <br />