702Fine Aggregate

702.1-FINE AGGREGATE FOR PORTLAND CEMENT CONCRETE: 702.1.1-General Requirements: Fine aggregate shall consist of natural sand, manufactured sand, or a combination thereof, conforming to the requirements of these Specifications. 702.1.2-Deleterious Substances: The Maximum percentages of deleterious substances shall not exceed the limits below. MATERIAL PERCENT BY WEIGHT Amount finer than No. 200 (75 μm) sieve for manufactured fine aggregate (determined by AASHTO T 11 and T 27). A manufactured fine aggregate is one which has been reduced in particle size by crushing 5.0 Amount finer than No. 200 (75 μm) sieve for all other sands (determined by AASHTO T 11 and T 27) 3.0 Coal and other lightweight deleterious material (determined by MP 702.01.20) 2 Friable particles (determined by MP 703.01.20) 1 Larger percentages passing the No. 200 (75 μm) sieve in the fine aggregate fraction will be permitted if the percent passing the No. 200 (75 μm) sieve in the coarse aggregate fraction (703.4) is less than the specified maximum. In no event, however, shall the percent passing the No. 200 (75 μm) siev e in the total concrete aggregate be greater than an amount which would exist if both aggregate fractions contained their specified maximum percentage passing the No. 200 (75 μm) sieve. 702.1.3-Soundness (Determined by MP 703.00.22): When the fine aggr egate is subjected to five alternations of the sodium sulphate soundness test, the weighted loss shall not exceed 10 percent (10%) by weight. 702.1.4-Organic Impurities (Determined by AASHTO T 21): When the fine aggregate is subjected to the organic impurities test, the color shall not be darker than the standard. In the event a color darker than the standard is produced, the acceptability of the material will be determined as specified in 702.1.5. 702.1.5-Mortar Strength (Determined by AA SHTO T 71): Fine aggregate failing the organic impurities test shall be subjected to the test for mortar making properties. The fine aggregate shall develop a compressive strength at the age of seven days when using Type I or II cement, or at three days when using Type III cement, of not less than 90 percent (90%) of the strength developed by a mortar prepared in the same manner with the same cement and graded Ottawa sand having a fineness modulus of 2.4 plus or minus 0.10. 776 702.1.6-Grading: The fine aggregate used for developing a concrete mix design shall have an Ā of 6.1 plus or minus 0.4. The Ā value shall be determined by adding the cumulative percentages by weight of material passing each of U.S. Standard Sieve Nos. 1½ in. (37.5 mm), ¾ in. (19 mm), 3/8 in. (9.5 mm), 4 (, 4.75 mm), 8 (2.36 mm), 16 (1.18 mm), 30 (600 μm), 50 (300 μm), 100 (150 μm), and 200 (75 μm) and dividing by 100. The graduation shall be determined in accordance with AASHTO T 27 and T 11. 702.1.7-Uniformity of Grading: The gradation limits given in 702.1.6 represent the extreme limits which shall determine suitability of material from all sources of supply. The gradation of material from any one source, however, shall be reasonably uniform. 702.2-MORTAR SAND: Sand (natural or manufactured) shall meet the requirements of AASHTO M 45, except delete 4.1 through 4.4 and substitute the following: Aggregate for use in masonry mortar shall be graded within the following limits: SIEVE SIZE PERCENT PASSING No. 4 (4.75 mm) 100 No. 8 (2.36 mm) 90-100 No. 100 (150 μm) 0-30 No. 200 (75 μm) 0-10 For joints thicker than ½ in ch, sand meeting the requirements of subsections 702.1.1 through 702.1.5 and 702.6 will be permitted. 702.3-FINE AGGREGATE FOR ASPHALT MIXTURES: Fine aggregate for asphalt mixtures shall meet the requirements of ASTM D1073, except that the gradation requirements will be waived. 702.4-MINERAL FILLER FOR ASPHALT MIXTURES: Mineral filler for asphalt mixtures shall meet the requirements of ASTM D242, modified as follows: Mineral filler shall be free from harmful organ ic impurities. Gradation requirements will be waived. 702.5-LIGHTWEIGHT FINE AGGREGATE FOR STRUCTURAL CONCRETE: Lightweight fine aggregate for structural concrete shall meet the requirements of ASTM C330. 702.6-ALTERNATE GRADING: Fine aggregate shall be well graded from coarse to fine and shall conform to the following requirements: SIEVE SIZE PERCENT PASSING BY WEIGHT 3/8 in. (9.5 mm) 100 No. 4 (4.75 mm) 95-100 No. 16 (1.18 mm) 45-80 No. 50 (300 μm) 10-30 No. 100 (150 μm) 2-10 777