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I <br /> 1 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 /> IC. Aggregates: <br /> 1. Fine aggregate shall consist of washing inert sand conforming to the <br /> I requirements of ASTM Specification C-33, and the following detailed <br /> requirements: <br /> Sieve % Passing <br /> 1 No. 4 95-100% <br /> 16 60-75 <br /> I 50 <br /> 100 13-30 <br /> 3-8 <br /> I Fineness Modulus 2.4-2.6 <br /> Organics Organic Plate 2, per ASTM <br /> C-40 <br /> Silt 2.0% maximum <br /> I Mortar Strength 95% minimum as per ASTM <br /> C87, Section 10 <br /> Soundness 8% maximum loss, using <br /> I magnesium sulfate, <br /> subjected to 5 cycles <br /> I 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 /> I Organics Organic Plate 1, per ASTM <br /> C-40 <br /> Silt 1.0% maximum <br /> I Soundness 8% maximum loss, using <br /> magnesium sulfate, <br /> subjected to 5 cycles <br /> I3. The following designated sizes* of aggregate shall be the maximum <br /> employed in concrete: <br /> I 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 /> I4. *Note: The "Designated Size" and the corresponding gradations shown <br /> represent the end or combined gradation of the coarse aggregate to be <br /> used in the final concrete. <br /> ID. Water: <br /> 1. Water shall be clean and free from injurious amounts of oils, acid, alkali, <br /> I 2. organic matter or other deleterious substances. <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 /> I and normal portland cement shall be at least 100 per cent of the strength of <br /> similar specimens made with distilled water. <br /> I05/08 03300-5 05-4893 <br />