Soil Art. 1009.04 SECTION 1009. SOIL
1009.01 Soil for Soil Modification. When lime (slurry or dry) is used as the
modifier, the soil shall have a minimum clay content of 15 percent, determined according to AASHTO T 88; and shall have a maximum organic matter content of 10 percent, determined according to AASHTO T 194.
1009.02 Soil for Lime Stabilization. The soil shall have a minimum clay
content of 15 percent, determined according to AASHTO T 88; and shall have a maximum organic matter content of 10 percent, determined according to AASHTO T 194. The soil shall also be reactive. A reactive soil is defined as a soil which when mixed thoroughly with at least three percent lime and then compacted and cured for 48 hours at 120 °F (49 °C), will exhibit a compressive strength gain of at least 50 psi (345 kPa) greater than that obtained from similarly prepared untreated control specimens. The compressive strength will be determined according to AASHTO T 208.
1009.03 Soil for Soil-Cement Base Course. The soil shall consist of the
existing soil in the roadway, imported soil or aggregate, or a mixture of existing soil and imported soil, approved by the Engineer. Imported soil or aggregate shall pass a 1 1/2 in. (37.5 mm) sieve and shall contain a maximum of 15 percent retained on a 1 in. (25 mm) sieve. The soil, whether consisting entirely of existing roadway soil, imported soil or aggregate, or a mixture of existing soil and imported soil, shall all pass a 3 in. (75 mm) sieve and a maximum of 45 percent shall be retained on the No. 4 (4.75 mm) sieve.
1009.04 Soil and Other Materials for Embankments, Fills, and Subgrades.
The Engineer may designate a soil as suitable, unsuitable, or restricted-use; and stable or unstable through visual inspection. At the discretion of the Engineer, verification of a soil’s designation may be confirmed through testing or other means. Suitable and restricted-use soil shall be defined as follows. Test Suitable Soil Restricted-Use Soil Standard Dry Density at Optimum Moisture Content (OMC), (Illinois Modified AASHTO T 99 – Method C & Annex A1), lb/cu ft 90 min. 90 min. Organic Content, (AASHTO T 194), % 10 max. 10 max. Silt and Fine Sand, (AASHTO T 88), % 65 max. - Passing No. 200 Sieve, % - 35 max. Plasticity Index, (AASHTO T 90), % 12 min. - Liquid Limit, (AASHTO T 89), % 50 max. 60 max. A stable and suitable or restricted-use soil shall meet the above criteria and in addition have a moisture content within the range defined in Article 205.06. Art. 1009.04 Soil An unstable and suitable or restricted-use soil shall meet the above criteria, but the moisture content exceeds the maximum defined in Article 205.06. If there are changed or differing site conditions according to Article 105.01, an absence or sparsity of geotechnical data, or for other reasons; an unstable and suitable or restricted-use soil may be declared unsuitable by the Engineer. Restricted-use miscellaneous materials shall include stones and boulders naturally occurring within the right-of-way; broken concrete without protruding metal bars; bricks; rock; stone; recycled asphalt pavement according to Article 1031.01 with no expansive aggregate; uncontaminated dirt and sand generated from construction or demolition activities; and other materials proposed by the Contractor and approved by the Engineer. Other excavated material not described above shall be designated as unsuitable by the Engineer. At the discretion of the Engineer, soils that exhibit potential for significant erosion or excessive volume change may also be designated as unsuitable. SECTION 1010. FINELY DIVIDED MINERALS
1010.01 Description. Finely divided minerals shall include fly ash, microsilica
(silica fume), high-reactivity metakaolin (HRM), and ground granulated blast-furnace slag (GGBF). The finely divided minerals will be approved according to the Bureau of Materials Policy Memorandum, "Acceptance Procedure for Finely Divided Minerals used in Concrete and Other Applications". The Department will maintain a qualified producer list. Different sources or types of finely divided minerals shall not be mixed or used alternately in the same item of construction, unless approved by the Engineer.
1010.02 Fly Ash. Fly ash shall consist of the finely divided residue that results
from the combustion of ground or powdered coal, transported from the combustion chamber by exhaust gas, collected by mechanical or electrical means, and stored in stockpiles or bins. Fly ash shall be according to AASHTO M 295 and the following.
a.Reserved.
b.Portland Cement Concrete, Cement Aggregate Mixture II, Fabric Formed Concrete Revetment Mat Grout, and Insertion Lining of Pipe Culverts Grout. The fly ash shall be Class C or F.
c.Soil Modification. The fly ash shall be Class C.
1010.03 Microsilica (silica fume). Microsilica is an amorphous silica of high
silica content and purity possessing high pozzolanic activity. The microsilica used in portland cement concrete shall be according to AASHTO M 307. The microsilica shall be supplied either in a dry, densified form or as a water- based slurry.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 830–831 of 1,217. View official source ↗