03-12-1984 Council Packet - Laserfiche WebLink

Home Browse Search

Ewj Bring slab surfaces to the correct level with a straight edge and then strike -- off. Use bullflosts or derbies to smooth the surface, leaving it free from bumps and hollows. Do not sprinkle water on the plastic surface. Do not aisturb the slab sur- faces prior to start of finishing operations. 03300.6.2. Cold Weather Placing: Do not place concrete when the air tempera- ture is less than 40 degrees F. without the specific approval of the Engi- neer. Comply with ACI 306 to protect all concrete work from physical damage and reduced strength which would be caused by frost, freezing actions, or low temperatures. 03300.6.3. Hot Weather Placing: When hot weather conditions exist, comply with ACI 305. Wet forms and reinforcement thoroughly prior to placement of concrete. Maintain concrete temperature at time of placement below 90' F. 03300.7. CONCRETE FINISHING: Provide finishing operations as specified herein and as shown on the plans. 03300.7.1. Float Finish: Apply float finish to all slab surfaces that are to receive trowel finish and other finishes. After placing concrete slabs, do not work the surface until ready for float- ing. Begin floating when the surface water has disappeared and when the con- crete has stiffened sufficiently to permit operation of a power -driven float. Consolidate the surface with power -driven float, or by hand -floating if the area is small or inaccessible to power units. Check and level the surface plane to a tolerance not exceeding 1/8 inch in 10 feet when tested with a 10 foot straightedge placed on the surface at not less than two different angles. Uniformly slope to drains at 1/16" per ft. Immediately after leveling, refle-t the surfaces to a smooth, uniform, granular texture. 03300.7.2. Trowel Finish: After floating, begin the first trowel. finish open— ion using a power -driven trowel oc equal. Begin final troweling when the burface produces a ringing sound as the trowel is moved over the surface. Consolidate the concrete surface by the final hand -troweling operation, free from trowel marks, uniform in texture and appearance, and with a surface plane tolerar^_e not exceeding 1/8 inch in 10 feet when tested with a 10 foot t.• straightedge. 03300.7.3. Non Slip Broom Finish: Apply nonslip light hair broom finish to all concrete slabs. Immediately after trowel finishing, slightly roughen the concrete surface by brooming in the direction perpendicular to the main traffic route. 60 j 03300-3 0-9593b I �10