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1 <br />' written approval of the Engineer. Air entraining cements may be used with written <br />approval of the Engineer. Cement brands shall be subject to approval. <br />C. Aggregates: <br />1. Fine aggregate shall consist of washing inert sand conforming to the <br />' requirements of ASTM Specification C -33, and the following detailed <br />requirements: <br />2. Coarse aggregate shall consist of well - graded crushed rock or washing <br />gravel conforming to the requirements of ASTM Specification C -33 and the <br />following detailed requirements: <br />Sieve <br />% Passing <br />tNo. <br />C -40 <br />4 <br />95 -100% <br />16 <br />60 -75 <br />' <br />50 <br />13 -30 <br />100 <br />3 -8 <br />' <br />Fineness Modulus <br />Organics <br />2.4 -2.6 <br />Organic Plate 2, per ASTM <br />C -40 <br />Silt <br />2.0% maximum <br />Mortar Strength <br />95% minimum as per ASTM <br />C87, Section 10 <br />Soundness <br />8% maximum loss, using <br />magnesium sulfate, <br />' <br />subjected to 5 cycles <br />2. Coarse aggregate shall consist of well - graded crushed rock or washing <br />gravel conforming to the requirements of ASTM Specification C -33 and the <br />following detailed requirements: <br />1 05/08 03300 -5 05 -4893 <br />Organics Organic Plate 1, per ASTM <br />C -40 <br />Silt 1.0% maximum <br />Soundness 8% maximum loss, using <br />' <br />magnesium sulfate, <br />subjected to 5 cycles <br />' <br />3. <br />The following designated sizes* of aggregate shall be the maximum <br />employed in concrete: <br />2 inch for plain concrete <br />1 inch for reinforced sections 10 inch and over in thickness <br />3/4 inch for reinforced sections less than 10 inch in thickness <br />4. <br />*Note: The "Designated Size" and the corresponding gradations shown <br />represent the end or combined gradation of the coarse aggregate to be <br />' <br />used in the final concrete. <br />D. Water: <br />1. <br />Water shall be clean and free from injurious amounts of oils, acid, alkali, <br />' <br />organic matter or other deleterious substances. <br />2. <br />When subjected to the mortar strength test described in ASTM C87, the 28 <br />day strength of mortar specimens made with the water under examination <br />and normal portland cement shall be at least 100 per cent of the strength of <br />similar specimens made with distilled water. <br />1 05/08 03300 -5 05 -4893 <br />