1107 - AGGREGATES FOR BACKFILL
1100-23 c. MSE Walls: Modular Block with Soil Reinforcing Geogrid.
1.Composition. Use granular backfill material in th e structure volume of sand, sand-gravel, or crushed stone, reasonably free from organics or otherwise deleterious materials, and complies with the following:
2.Quality. Submit representative material samples fo r the following tests to the Materials and Research Center, 2300 Van Buren, Topeka, KS 66611 (ATTENTIO N: Geotechnical Enginee r) for acceptance prior to utilizing this material on the project.
a.The Plasticity Index (P.I.) is 6 maximum, determined by KT-10. (b) An angle of internal friction of 34 degrees or greater, as determined by the standard direct shear test – AASHTO T 236, utilizing a sample of the material compacted to 95% of AASHTO T 99 Methods C or D (with oversize correction, as outlined in Note 9 in AASHTO T 99) at optimum moisture content.
c.Soundness. “Freeze and Thaw”, minimum 0.90 as determined in DIVISION 1100 .
d.Wear. Los Angeles Wear Abrasion, maximum 40%.
e.Provide material that complies with TABLE 1107-5 . TABLE 1107-5: ELECTROCHEMICA L REQUIREMENTS (Block) Requirements Test Method (Mesa) pH > 3.0 AASHTO T 289 (Anchor Landmark) pH: 3.0 to 9.0 AASHTO T 289 Organic Content < 1% AASHTO T 267
3.Product Control.
a.Gradation. TABLE 1107-6: AGGREGATES FOR MO DULAR BLOCK MSE WALLS BACKFILL Type of Material % Retained – Square Mesh Sieves 1” No. 40 No. 200 Sand 0 40-100 95-100 Crushed Stone 0 40-100 95-100 Limit the maximum particle size to ¾ inch for geosyn thetic reinforced structures and for epoxy or PVC coated reinforcements. Use only crushed stone in District 1. For select granular backfill material composed of crushed stone, submit a proposed project gradation with single-point gradations and tolerances fo r approval. For sand and sand-gravel combinations, a project gradation will be issued that will specify gradation tolerances after the proposed material is approved. Any quality assurance samples which fall outside the tolerances will nece ssitate re-approval to be in compliance with subsection 1108.2 c.(2).
d.Underdrain, Permeable or Granular Backfill .
1.Composition. Provide washed aggregate Type BD-1 and Type UD-1 composed of crushed or uncrushed gravel, or crushed stone. (2) Quality. Soundness, minimum (KTMR-21) ................................................................. 0.90 Wear, maximum (KTMR-24) ........................................................................ 40%
3.Product Control. Provide aggregate that complies with TABLE 1107-7 TABLE-1107-7: AGGREGATES FOR UNDER DRAIN AND OTHER PERMEABLE BACKFILL Type Percent Retained-Square Mesh Sieves 1 ½” 1” ¾” 3/8” No. 4 No. 8 No. 16 No. 30 No. 50 No. 100 BD-1* 0 0-10 10-40 80-100 90-100 93-100 98-100 UD-1 0 0-15 40-60 70-95 98-100 *BD-1 is intended for use with a filter fabric. 1107 - AGGREGATES FOR BACKFILL
1100-24 (4) Deleterious substances.
Shale or shalelike material , maximum (KT-8) ............................................... 3.0% Clay Lumps and friable particle s, maximum (KT-7) ..................................... 3.0% Sticks (wet), maximum (KT-35) .................................................................... 1.0%
e.Crushed Stone.
1.Composition. Provide material produced by the crushing of any type of stone complying with the following.
2.Quality. Soundness, minimum (KTMR-21) ................................................................. 0.70 Wear, maximum (AASHTO T 96) ................................................................. 50%
3.Product Control.
a.Size Requirements. Provide uniformly graded cr ushed stone, from coarse to fine, for backfill that complies with TABLE 1107-8 : TABLE 1107-8: CRUSHED STONE BACKFILL Percent Retained-Square Mesh Sieves 2” 3/8” No. 16 0 20 - 50 50 - 100
b.Deleterious Substances. Clay lumps and friable particles, maximum (KT-7) ........................ 5.0% 1107.3 TEST METHODS Test aggregates according to the applicable provisions of SECTION 1115 . 1107.4 PREQUALIFICATION Prequalify aggregate sources according to subsection 1101.4 . 1107.5 BASIS OF ACCEPTANCE Aggregates covered by this subsection are accepted based on the procedures described in subsection 1101.5 .
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 680–681 of 978.