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PGSF WMVD Storm and Combined Sewer - Construction Package 2 Cast-in-Place Concrete <br />Project No. 180162 03 30 00 - 6 <br /> <br />B. Ground granulated blast-furnace slag (GGBFS), if used in conjunction with portland <br />cement, shall be per ASTM C989, Grade 100 or Grade 120, limited to 50 percent of the <br />weight of cementitious materials. If GGBFS is combined with pozzolans and/or silica <br />fume, the total weight of GGBFS, pozzolans, and silica fume shall not exceed 50 percent <br />of the weight of cementitious materials. <br />C. Silica fume, if used in conjunction with portland cement, shall be per ASTM C1240, <br />limited to 10 percent of the weight of cementitious materials. Silica fume shall be used <br />with a high-range water-reducing admixture. <br />D. Aggregates: <br />1. General: <br />a. Except as modified herein, fine and coarse aggregates shall conform to ASTM <br />C33. Fine and coarse aggregates are regarded as separate ingredients. <br />Aggregates shall be non-reactive and washed before use. <br />b. Check aggregates for alkali-silica reactivity to meet the following criteria. <br />Aggregates or combinations of cementitious materials and aggregates shall have <br />less than 0.10% expansion at 16 days when tested in accordance with ASTM <br />C1260 or ASTM C1567. Alternatively, aggregate tested independently in <br />accordance with ASTM C1293 shall have less than 0.04% expansion at one-year, <br />or combinations of aggregate and cementitious materials tested in accordance <br />with ASTM C1293 shall have less than 0.04% expansion at two years. Test <br />results shall be no older than two years. <br />c. Tests for size and grading of fine and coarse aggregates shall be in accordance <br />with ASTM C136. Combined aggregates shall be well and uniformly graded from <br />coarse to fine sizes to produce a concrete that has optimum workability and <br />consolidation characteristics. Establish the final combined aggregate gradation <br />during mix design. <br />d. Aggregates used in the project production concrete shall be obtained from the <br />same sources and have the same size ranges as the aggregates used in the <br />concrete represented by the submitted historical data or trial mixtures. See <br />Change of Materials paragraph below. <br />2. Fine Aggregate: <br />a. Fine aggregate shall be hard, dense, durable particles of either sand or crushed <br />stone regularly graded from coarse to fine. Gradation shall conform to ASTM C33. <br />For classes of concrete which will be used in liquid retaining structures, fine <br />aggregate shall not exceed 40 percent by weight of combined aggregate total, <br />except for concrete with coarse aggregate of less than maximum size 1/2 inch. <br />b. Variations from the specified gradations in individual tests will be acceptable if <br />the average of three consecutive tests is within the specified limits and the <br />variation is within the permissible variation listed below: <br /> <br />U.S. standard sieve size Permissible variation in individual tests, percent <br />30 and coarser 2 <br />50 and finer 0.5 <br />