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Paris Santa Fe-Frisco Depot Rehabilitation © KEYSTONE ARCHITECTS <br /> Suly I0, 2001 <br /> <br /> deposited near its intended position and shall not be made to run or flow into place. <br /> Con~te sha~ be worked and tamped in, to obtain a dense and uniform mass. <br /> <br /> 6. No concrete shall be placed or finished when the temperature is 40° F. and falling, <br /> without the permission of the Engineer. Concrete, after placement, shall be protected <br /> from freezing for a period of four curing days after it has been placed. Curing days <br /> shall mean days during which the temperature is above 40° for a period of twelve <br /> hours. In case of drops in temperature below 32° F. the Contractor shall use cove~s, <br /> flares, heaters and/or other devices and shall maintain such protection on a twenty- <br /> four hour basis until the expiration of four curing days. Concrete which is allowed <br /> to freeze and become damaged as indicat~l by discoloration, disruption or failure to <br /> develop its proper strength shall be removed and replaced by this Contractor at his <br /> expense. Comply with ACI 305 & 306. <br /> <br /> E. Finish of Slabs: <br /> <br /> 1. The concrete shall be raked into place and thoroughly compacted by a vibrator and <br /> with a grill tamp. The surface shall be slruck off at the floor level by means of <br /> previously set screeds. <br /> <br /> 2. All expansion joints shall be well and accurately tooled to match appearance of existing <br /> historic sidewalk joints. The expansion joint material shall be cut back a minimum <br /> of 1/2" below concrete surface. <br /> <br /> 3. Walkway concrete shall be finished to match original existing slabs in color. .and <br /> texture, unless such coloration has been previously achieved during concrete nmang <br /> by colorant admixtures. <br /> <br /> * * END OF SECTION * * <br /> <br /> S~ction 03300 <br /> Page 6-6 <br /> <br /> <br />