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<br />03300 - 6/22 <br />1. Fine aggregates shall be clean sand conforming to ASTM C 33. <br />2. When tested in accordance with ASTM D 2419, the sand equivalency shall not <br />be less than 75 percent for an average of 3 samples, nor less than 70 percent <br />for an individual test. Gradation of fine aggregate shall conform to ASTM C 33 <br />when tested in accordance with ASTM C 136 for the fineness modulus of the <br />sand used, including the optional grading in Section 6.2. The fineness <br />modulus of sand used shall not be over 3.1. <br />3. When tested in accordance with ASTM C 33, the fine aggregate shall produce <br />a color in the supernatant liquid no darker than the reference standard color <br />solution. <br />2.04 WATER: <br />A. The water used in the concrete mix and for curing shall be clean, potable, and in <br />accordance with ACI 318. Water shall be free from objectionable quantities of silty <br />organic matter, alkali, salts, and other impurities. <br />B. The water shall be considered potable, for the purposes of this Section only, if it <br />meets the requirements of the local governmental agencies. Agricultural water with <br />high total dissolved solids (over 1000 mg/l TDS) shall not be used. <br />2.05 ADMIXTURES: <br />A. General: All admixtures shall be compatible and be furnished by a single <br />manufacturer capable of providing qualified field service representation. Admixtures <br />shall be used in accordance with manufacturer's recommendations. If the use of an <br />admixture is producing an inferior end result, the CONTRACTOR shall discontinue <br />use of the admixture. Admixtures shall not contain thiocyanates nor more than 0.05 <br />percent chloride ion, and shall be non-toxic after 30 days. <br />B. Air Entraining Admixtures: <br />1. Air entraining admixture shall conform to ASTM C 260. Air content shall be <br />tested at the point of placement. <br />2. The air-entraining agent shall be added to the batch in a portion of the mixing <br />water. The solution shall be batched by means of a mechanical batcher <br />capable of accurate measurement. <br />C. Set Controlling and Water Reducing Admixtures: <br />1. Admixtures may be added at the CONTRACTOR's option, subject to the <br />ENGINEER's approval, to control the set, effect water reduction, and increase <br />workability. The cost of adding an admixture shall be the CONTRACTOR's <br />responsibility. Concrete containing an admixture shall be first placed at a <br />location determined by the ENGINEER. Admixtures shall conform to the <br />requirements of ASTM C 494. The required quantity of cement shall be used <br />in the mix regardless of whether or not an admixture is used. <br />2. Concrete shall not contain more than one water-reducing admixture. <br />3. Set retarding admixture may be either with or without water-reducing <br />properties. Where the air temperature at the time of placement is expected to <br />be consistently greater than 80 degrees F, a set retarding admixture shall be <br />used. Set retarding admixture shall conform to ASTM C 494 Type B or D. <br />4. Set accelerating admixture may be either with or without water-reducing <br />properties. Where the air temperature at the time of placement is expected to