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' <br /> , <br /> circumstances warrant; at no additional cost to Qwner and as accepted by Architect. � , <br /> Laboratory test data for revised mix design and strength results must be submitted to <br /> and accepted by Architect before using in woric. <br /> Admixtures: � <br /> Use air-entrainin� admixture in exterior exposed concrete, unless otherwise indicated. ' <br /> Add air-entraining admixture at manufacturer's prescribed rate to result in concrete at <br /> point of placement having total air content with a tolerance of plus-or-minus 1-1/2 <br /> percent within following limits: . , � <br /> S.0 - 7.096 by volune as determined by ASTM C231., <br /> Slump Limits: Proportion and design mixes to result in concrete slump at point of <br /> placement as follows: . , <br /> � Reinforced Foundation Systems: Not less than 1" and not more than 3". � <br /> Other Concrete: Not less than 1" and not more than k". <br /> 2;05 CONCRETE MIXING: , <br /> Job-Site Mixin�: Mix materials for concrete in appropciate drum type batch machine <br /> mixer. For mixers of one cu. yd., or smaller capacity, continue mixing at least 1-1/2 � <br /> minutes, but not more than S minutes aftec ingredients are in mixer, before any part of <br /> batch is released. For mixers of capacity larger than one cu. yd., increase minimum 1- <br /> 1/2 minutes of mixing time by 1S seconds for each additional cu. yd., oc fraction thereof. � <br /> Provide batch ticket for each batch discharged and used in work, indicating project <br /> identification name and number, date, mix type, mix time, quantity, and amou�t of , <br /> water introduced. � <br /> Ready-Mix Concrete: Comply with requirements of ASTM C 94, and as herein specified. <br /> During hot weather, or under conditions contributing to rapid setting of concrete, a , <br /> shorter mixing time than specified in ASTM C 94 may be required. <br /> PART 3 - EXECUTION , <br /> 3.01 GENERAL: <br /> Coordinate the installation of joint materials and vapor retarders with placement of � <br /> forms and reinforcing steel. <br /> , 3.02 FORMS: � <br /> Desi�n, erect, suppo�t, brace and maintain formwork to support vertical and laterial <br /> loads that might be applied until such loads can be supported by concrete structure. ( <br /> CONCRETE WORK 03310 - 4� <br /> � <br /> � <br />