Section 703 Section 703 The class of material will be specified in the contract. When the contract contains a numerical de signation after the class number, it shall be understood to indicate the requirement that th e material shall have a minimum PI of not less than that indicated by the numerical desi gnation. For example, Class B9-6 requires Class B9 material having a minimum PI of 6; or a Class B9-10 requires Class B9 material having a minimum PI of 10, etc. When a minimum PI is specified, the maximum plasticity index and the maximum liquid limit, as indicated in the table, will be ra ised the numerical designation for minimum PI, except that in the case of Class B8, Class B10 and Class B13 the maximum liquid limit shall remain as indicated in the table above. For the design soil portion of the embankment a ll of the material shall pass a three-inch sieve. Individual contracts may further restrict the maximu m size of material in the top portion of the design soil. SECTION 704 - AGGREGATE FOR DRAINAGE
704.01 Permeable Material. Permeable material for use in backfilling trenches, under,
around, and over underdrains and permeable material for blankets or other subdrainage purposes shall consist of hard, durable, clean sand, gravel, crushed stone, or crushed slag, and shall be free from organic material, clay balls, or other deleterious substances. These materials shall be as designated by Type as set out below.
704.02 Type A Filter Material . Type A filter material shall meet the requirements for
Size 7 seal cover aggregate, or Size 7, 57, or 67 coarse aggregate for hydraulic cement concrete, or Size II gravel coarse stabilizer as set out in Section 703. The crushing requirement for gravel seal cove r aggregate is not applicable.
704.03 Type B Filter Material . Type B filter material shall be concrete sand conforming
to the requirements of Subsection 703.02. 704.04--Type C Filter Material . Type C filter material shall consist of sand, stone, and/or slag screenings composed of hard, durable particles reasonably free of injurious amounts of soft or flaky particles, dust, lumps, organic, or other deleterious substances. The gradation of the material shall be as follows: Sieve Size Percent Passing 1/2 inch 100 No. 4 80 - 100 No. 16 37 - 80 No. 50 5 - 30 No. 100 0 - 10
704.05 Type D Impervious Material . Type D impervious material shall consist of
natural soil, soil aggregates, or a blend of na tural soil and aggregates. The material shall be reasonably free of sticks, roots and other objectionable matter, shall be classified as Group A-6 or A-7, and shall conform to the following: Percent passing No. 10 Sieve --------------------------------------------------------- 80-100 Percent passing the No. 200 Sieve, minimum ------------------------------------------- 36 Liquid Limit, maximum -------------------------------------------------------------------- 50 Plasticity Index ------------------------------------------------------------------------ 12 to 25 pH ------------------------------------------------------------------------------------- 4.5 to 8.0
704.06 Crushed Stone Drainage Layers. The aggregate shall be crushed limestone,
sandstone or granite conforming to the quality requirements of Subsections 703.01 and
703.03 The aggregate shall conform to the gradation set out below.
% Passing Sieve Size by Weight 1 1/2" 100 1" 95 - 100 1/2" 60 - 82 No. 4 35 - 55 No. 8 5 - 25 No. 16 3 - 11 No. 50 2 - 7 SECTION 705 - STONE BLANKET PROTECTION AND FILTER BLANKET MATERIALS
705.01 Stone Blanket Protection . In addition to meeting the quality requirements of
AASHTO M 80, Class E, stone blanket prot ection shall be in accordance with AASHTO M 43, Size No. 357. 705.02--Stone Filter Blanket . In addition to meeting the quality requirements of AASHTO M 80, Class E, filter blanket material shall conform to the gradation requirements of AASHTO M 43, Size No. 467.
705.03 Sand Filter Blanket . The sand filter blanket shall conform to the gradation
requirements of Subsection 703.02 for concrete sand.
705.04 Stone Riprap . Aggregate for loose riprap, stone riprap for foundation protection,
or that to be grouted shall consist of field stone, broken concrete, or rough, unhewn quarry stone as nearly rectangular in section as is practicable. The stone shall be dense, free of clay or shale seams, resistant to the action of air and water, and suitable in all other respects for the purpose intended. Quality requirements for rock to be furnished under these specifications will come from a pre-approved source or be visually approved prior to use. Stones for riprap, of the size sp ecified, shall meet the requireme nts for size by weight of the mass as specified in the following table: