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31604.DSK <br /> WP-SFO <br /> 3.3 PLACING CONCRETE <br /> A. Place concrete in accordance with ACI 301-89. <br /> I B. Prior to placing concrete, remove water from excavation and debris and <br /> foreign material from forms. Check reinforcing steel for proper placement <br /> and correct discrepancies. <br /> C. Before depositing new concrete on old concrete, clean surface using <br /> sandblast or bushhammer or other mechanical means to obtain a 114-inch <br /> I rough profile, and pour a cement-sand grout to minimum depth of 112-inch <br /> over the surface. Proportion 1 part cement to 2.5 parts sand by weight. <br /> D. Place concrete as soon as possible after leaving mixer, without segregation <br /> or loss of ingredients, without splashing forms or steel above, and in layers <br /> not over 2 feet deep. Place within 1-112 hours after adding cement to mix. <br /> E. Four feet maximum vertical drop to final placement, when not guided with <br /> chutes or other devices to prevent segregation due to impact with <br /> reinforcing. <br /> 3.4 <br /> 3.4 COMPACTION <br /> A. Vibrate concrete as follows: <br /> 1. Apply approved vibrator at points spaced not farther apart than <br /> vibrator's effective radius. <br /> 2. Apply close enough to forms to vibrate surface effectively but not <br /> damage form surfaces. <br /> 3. Vibrate until concrete becomes uniformly plastic. <br /> 4. Vibrator must penetrate fresh placed concrete and into previous layer <br /> of fresh concrete below. <br /> 3.5 FINISHING <br /> A. Floor Slabs and Tops of Walls: <br /> 1. Screed surfaces to true level planes. <br /> 2. After initial water has been absorbed, float with wood float and trowel <br /> with steel trowel to smooth finish free from trowel marks. <br /> 3. Do not absorb wet spots with neat cement. <br /> B. Tolerances: Floors shall not vary from level or true plane more than <br /> 114 inch in 10 feet when measured with a straightedge. <br /> 3.6 PROTECTION AND CURING <br /> A. Protect fresh concrete from direct rays of sunlight, drying winds, and wash <br /> by rain. <br /> B. Keep concrete slabs continuously wet for a 7-day period. Intermittent <br /> f <br /> wetting is not acceptable. <br /> BAE31604.AS.T1 <br /> 03301 4 REINFORCED CONCRETE <br />