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Percentage Passing (Aggregate Nominal Sizes <br /> 37.5-mm x 19-mm 25-mm x 4.75-mm 12.5-mm x 4:75-mm 9.5-mm x 2.36-mm <br /> Operating Contract Operating Contract Operating Contract Operating Contract <br /> Sieve Sizes Range Compliance Range Compliance .RMg .fiance Range Compfiance <br /> 50-mm 100 100 — — — — — — <br /> 37.5-mm 88- 100 85- 100 100 100 — — — <br /> 25-mm X±18 X±25 88- 100 86- 100 — — — <br /> 19-mm 0- 17 0-20 X±15 X±22 100 100 — — <br /> 12.5-mm — — — — 82- 100 80- 100 100 100 <br /> 9.5-mm 0-7 0-9 X±15 X±22 X±15 X±22 X±15 X±20 <br /> 4.75-mm — — 0- 16 0- 18 0- 15 0- 18 0-25 0-28 <br /> 2.36-mm — — 0-6 1 0-7 0-6 0-7 0-6 0-7 <br /> • In the above table,the symbol X is the gradation that the Contractor proposes to furnish for the specific sieve size as <br /> provided in Section 90-3.01,"General." <br /> • Coarse aggregate for the 37.5-mm, maximum, combined aggregate grading as provided in Section 90-3.04, <br /> "Combined Aggregate Gradings," shall be furnished in 2 or more primary aggregate nominal sizes. Each primary aggregate <br /> nominal size may be separated into 2 sizes and stored separately, provided that the combined material conforms to the <br /> grading requirements for that particular primary aggregate nominal size. <br /> • When the 25-mm, maximum, combined aggregate grading as provided in Section 90-3.04, "Combined Aggregate <br /> Gradings,"is to be used,the coarse aggregate may be separated into 2 sizes and stored separately,provided that the combined <br /> material shall conform to the grading requirements for the 25-mm x 4.75-mm primary aggregate nominal size. <br /> 90-3.03 FINE AGGREGATE GRADING <br /> • Fine aggregate shall be graded within the following limits: <br /> Percents a Passing <br /> Sieve Sizes Operating Range Contract Compliance <br /> 9.5-mm 100 100 <br /> 4.75-mm 95 - 100 93 - 100 <br /> 2.36-mm 65-95 61 -99 <br /> 1.18-mm X±10 X±13 <br /> 600-gm X±9 X±12 <br /> 300-gm X±6 X±9 <br /> 150-gm 2- 12 1 - 15 <br /> 75- m 0-8 0- 10 <br /> • In the above table,the symbol X is the gradation that the Contractor proposes to furnish for the specific sieve size as <br /> provided in Section 90-3.01,"General." <br /> • In addition to the above required grading analysis,the distribution of the fine aggregate sizes shall be such that the <br /> difference between the total percentage passing the 1.18-mm sieve and the total percentage passing the 600-µm sieve shall be <br /> between 10 and 40, and the difference between the percentage passing the 600-µm and 300-µm sieves shall be between 10 <br /> and 40. <br /> • Fine aggregate may be separated into 2 or more sizes and stored separately, provided that the combined material <br /> conforms to the grading requirements specified in this Section 90-3.03. <br /> 90-3.04 COMBINED AGGREGATE GRADINGS <br /> • Combined aggregate grading limits shall be used only for the design of concrete mixes. Concrete mixes shall be <br /> designed so that aggregates are combined in proportions that shall produce a mixture within the grading limits for combined <br /> aggregates as specified herein. <br /> • The combined aggregate grading, except when otherwise specified in these specifications or the special provisions, <br /> shall be either the 37.5-mm,maximum grading,or the 25-mm,maximum grading,at the option of the Contractor. <br /> Contract No. 10-OM7104 <br /> 76 <br />