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' 40-27 BUILDING <br />CAST -IN -PLACE CONCRETE <br />J <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />1.7 QUALITY ASSURANCE <br />A. Installer Qualifications: A qualified installer who employs on Project personnel qualified <br />as ACI-certified Flatwork Technician and Finisher and a supervisor who is an ACI- <br />certified Concrete Flatwork Technician. <br />B. Manufacturer Qualifications: A firm experienced in manufacturing ready -mixed <br />concrete products and that complies with ASTM C 94/C 94M requirements for <br />production facilities and equipment. <br />1.8 PRECONSTRUCTION TESTING <br />A. Preconstruction Testing Service: Engage a qualified testing agency to perform <br />preconstruction testing on concrete mixtures. <br />1.9 DELIVERY, STORAGE, AND HANDLING <br />A. Steel Reinforcement: Deliver, store, and handle steel reinforcement to prevent bending <br />and damage. <br />B. Waterstops: Store waterstops under cover to protect from moisture, sunlight, dirt, oil, <br />and other contaminants. <br />1.10 FIELD CONDITIONS <br />A. Cold -Weather Placement: Comply with ACI 306.1 and as follows. Protect concrete <br />work from physical damage or reduced strength that could be caused by frost, freezing <br />actions, or low temperatures. <br />1. When average high and low temperature is expected to fall below 40 deg F for <br />three successive days, maintain delivered concrete mixture temperature within <br />the temperature range required by ACI 301. <br />2. Do not use frozen materials or materials containing ice or snow. Do not place <br />concrete on frozen subgrade or on subgrade containing frozen materials. <br />3. Do not use calcium chloride, salt, or other materials containing antifreeze agents <br />or chemical accelerators unless otherwise specified and approved in mixture <br />designs. <br />B. Hot -Weather Placement: Comply with ACI 301 and as follows: <br />1. Maintain concrete temperature below 90 deg F at time of placement. Chilled <br />mixing water or chopped ice may be used to control temperature, provided water <br />equivalent of ice is calculated to total amount of mixing water. Using liquid <br />nitrogen to cool concrete is Contractor's option. <br />2. Fog -spray forms, steel reinforcement, and subgrade just before placing concrete. <br />Keep subgrade uniformly moist without standing water, soft spots, or dry areas. <br />C06922.001.00 03 30 00 - 3 <br />05-22-14 <br />