Art. 1007.13 Structural Steel Coatings Treated material shall be placed in a position as to facilitate thorough drainage of any preservative remaining on the material. AWPA Standard M4 shall be used for repair of cuts and abrasions and treatment of bored holes. Three brush coats of the repair material shall be used. Each coat shall be allowed to dry before the next coat is applied. Treated material which is otherwise satisfactory may be rejected if coated with dirt. When material is stored for an extended length of time, the material shall be protected from the weather. SECTION 1008. STRUCTURAL STEEL COATINGS
1008.01 Sampling, Testing, Acceptance, and Certification. Structural steel
coatings shall be on the Department’s qualified product list and be according to the following.
a.Qualification Samples and Tests. The manufacturer shall supply to an independent test laboratory and to the Department, duplicate samples of the structural steel coating for evaluation. Prior to approval and use, the manufacturer shall submit a notarized certification of the independent laboratory, together with results of all tests, stating that this material meets the requirements as set forth herein. The certified test report shall state the lot tested, manufacturer's name, product name, and date of manufacture. New certified tests results and samples for testing by the Department shall be submitted anytime the manufacturing process or paint formulation is changed. All costs of testing (other than tests conducted by the Department) shall be borne by the manufacturer.
b.Acceptance Samples and Certification. A 1 qt (1 L) sample of each lot of paint produced for use on State or local agency projects shall be submitted to the Department for testing, together with a manufacturer's certification. The certification shall state that the formulation for the lot represented is essentially identical to that used for qualification testing. All acceptance samples shall be taken by a representative of the Department. The structural steel coating shall not be used until tests are completed and they have met the requirements as set forth herein.
c.Packaging and Labeling. Each container shall have a label clearly showing the manufacturer, product name, lot number, date of manufacture, and shelf life. The label shall also include complete instructions for use of the product. The container shall be coated, if necessary, to prevent attack by the paint components.
1008.03 Aluminum Epoxy Mastic. Aluminum epoxy mastic shall be a two
component epoxy primer containing aluminum pigment designed as a one coat high- build complete protective coating system with excellent adhesion to rusted steel, inorganic zinc, and old paint after such surfaces have been properly cleaned. The aluminum epoxy mastic shall be compatible with a wide range of topcoats including waterborne acrylics, alkyds, and polyurethanes. The aluminum epoxy mastic shall be according to the following.
a.Pigment. The primary pigment shall be either a leafing or non-leafing aluminum pigment. Secondary pigmentation shall not contain more than trace amounts of lead, chromium, or other toxic heavy metals.
b.Vehicle. The vehicle shall be a modified epoxy and curing agent which is suitably insensitive to moisture to allow trouble free application.
c.Packaged Components. The epoxy coating shall be supplied as a two- component material. It shall be well ground, free of caking, skins, gellation, and excessive setting. The shelf life of each component shall not be less than 12 months.
d.Properties of Aluminum Epoxy Mastic. The properties shall be according to the following.
1.The mixed epoxy shall contain a minimum of 87 percent solids by weight, when tested according to ASTM D 1644, Method A, except that the sample shall be heated for 72 hours at 100 ±2 °F (37.8 ±1 °C).
2.The unit weight of the unmixed components shall not vary more than ± 0.2 lb/gal (± 24 g/L) from the weight of the original qualification samples.
3.The viscosity of the coating shall be a minimum of 85 KU at 77 ±2 °F (25 ±1 °C). Viscosity must be checked immediately after addition and mixing of components.
4.The pot life of the epoxy coating shall be no shorter than two hours at 75 ºF (24 °C) or one hour at 90 ºF (32 °C).
5.The epoxy coating shall air cure at a temperature of 75 °F (24 °C) or above to a hard tough film within five days, by evaporation of solvent and chemical reaction. It shall be dry to the touch in 24 hours at 75 °F (24 °C), and able to receive foot traffic in 48 hours at 75 °F (24 °C).
6.The mixture, when thinned per manufacturer's recommendations, shall exhibit no runs or sags, when applied by conventional or airless spray to produce dry film thicknesses of 5 to 7 mil (125 to 175 micron).
7.The Volatile Organic Compounds (VOC) shall not exceed 2.8 lb/gal (340 g/L) as applied when tested according to ASTM D 3960. Art. 1008.03 Structural Steel Coatings
e.Resistance Tests of Cured Aluminum Epoxy Mastic. The aluminum epoxy mastic shall be tested according to the Bureau of Materials ITP, "Resistance Tests of Cured Aluminum Epoxy Mastic". The material will not be accepted if any individual test panel fails any one of the following tests.
1.Fresh Water Resistance. The panels shall show no rusting, blistering, or softening beyond 1/16 in. (1.6 mm) from the scribe mark, when examined after 30 days. Discoloration of the coating will be allowed.
2.Salt Water Resistance. The panels shall show no rusting, blistering, or softening beyond 1/16 in. (1.6 mm) from the scribe mark upon examination after 7, 14, and 30 days. Discoloration of the coating will be allowed.
3.Salt Fog Resistance. After 1,000 hours of continuous exposure, the coating shall show no loss of bond, nor shall it show rusting or blistering beyond 1/16 in. (1.6 mm) from the center of the scribed mark.
4.Weathering Resistance. After 1,000 hours, the panels shall show no loss of bond, nor shall they show rusting, softening, or blistering.
1008.04 Waterborne Acrylic. The acrylic primer and finish coat shall be a two-
coat, waterborne acrylic paint system for direct to metal application on prepared structural steel and for topcoating previously painted surfaces. The acrylic primer shall be suitable as an intermediate coat over inorganic and organic zinc primers, aluminum epoxy mastics, acrylics, vinyls, and alkyds. The acrylic finish coat shall be compatible as a topcoat over the primer. The waterborne acrylic paint system shall be according to the following.
a.The acrylic paints shall meet the requirements of the Steel Structures Painting Council's Painting System Specification No. 24.00 (Latex Painting System for Industrial and Marine Atmospheres, Performance-Based) as outlined in Volume 2, Systems and Specifications, Seventh Edition. The performance testing shall comply with Level I, except that Section 6.3, Early Rust Resistance of System shall be modified according to the Bureau of Materials ITP, "Modification of Early Rust Resistance of Waterborne Acrylic Paint System".
b.Workability. The paints shall be easily applied by conventional and airless spray to smooth vertical surfaces at a minimum dry film thickness of 3 mils (75 microns) per coat without runs, sags, or other film defects. When application is made by brush or roller, multiple coats will be permitted to achieve 3 mils (75 microns) dry film thickness and uniformity of appearance.
c.Toxicity. The paints shall not contain more than trace amounts of lead, hexavalent chromium, cadmium, mercury, or other toxic heavy metals.
d.Flash Point. The flash point of the coatings shall be greater than 149 ºF (65 ºC) as determined by a Pensky-Martens Closed Cup Tester according to ASTM D 93. Structural Steel Coatings Art. 1008.05
e.Shelf Life. The paints shall show no curdling, gelling, gassing, or an increase in viscosity of more than 10 KU after one year from the date of manufacture when packaged in tightly covered unopened containers and stored at temperatures between 50 and 90 °F (10 and 32 °C).
f.Volume Solids. The coatings shall not be less than 32 percent solids by volume.
g.Odor. Freshly opened containers of the paints shall not exhibit any rancid, putrid, or other objectionable odors.
h.Drying Time. The paints shall set to touch within four hours and dry through within 24 hours when applied at 10 mils (250 microns) wet film thickness and tested according to ASTM D 1640.
i.Color and Hiding Power. The color shall be tested according to the Bureau of Materials ITP, "Color Difference of Waterborne Acrylic Paint". The primer shall match Munsell Matte or Glossy Color 5Y 8/4 Yellow. The finish coat shall match Munsell Glossy Color 7.5G 4/8 Interstate Green, 2.5YR 3/4 Reddish Brown, 10B 3/6 Blue, or 5B 7/1 Gray. The color difference shall not exceed 10 Hunter Delta E Units for the primer and 3.0 Hunter Delta E Units for the finish coats. The contrast ratio of the finish coats at 2 mils (50 microns) dry film thickness shall not be less than 0.99 when tested according to ASTM D 2805.
j.Gloss. The 60 degrees specular gloss of the finish coats shall not be less than 65 when measured according to ASTM D 523.
k.Color and Gloss Retention of Finish Coats. The color and gloss retention shall be tested according to the Bureau of Materials ITP, "Color and Gloss Retention of Finish Coats of Waterborne Acrylic Paint". The panel shall not show a color change of more than 3 Hunter Delta E Units and the 60 degrees specular gloss shall not be less than 40.
l.Adhesion to Inorganic Zinc. The acrylic paints shall pass the topcoat adhesion test as specified in AASHTO M 300. The inorganic zinc-rich primer shall meet the requirements of Article 1008.02.
1008.05 Organic Zinc-Rich Paint System. The organic zinc-rich paint system
shall consist of an organic zinc-rich primer, an epoxy or urethane intermediate coat, and aliphatic urethane finish coats. It is intended for use over blast-cleaned steel when three-coat shop applications are specified. The system is also suitable for field painting blast-cleaned existing structures. The coating system shall be evaluated for performance through the National Transportation Product Evaluation Program (NTPEP) for Structural Steel Coatings following the requirements of AASHTO R 31, and shall meet the performance criteria listed herein. After successful NTPEP testing, the coatings shall be submitted to the Illinois Department of Transportation, Bureau of Materials, for qualification and acceptance testing. Art. 1008.05 Structural Steel Coatings
1.Compatibility. Each coating in the system shall be supplied by the same paint manufacturer.
2.Toxicity. Each coating shall contain less than 0.01 percent lead in the dry film and no more than trace amounts of hexavalent chromium, cadmium, mercury, or other toxic heavy metals.
3.Volatile Organics. The volatile organic compounds of each coating shall not exceed 2.8 lb/gal (340 g/L) as applied.
b.Panel Preparation for NTPEP testing. The test panels shall be prepared according to AASHTO R 31, except for the following: Test panels shall be scribed according to ASTM D 1654 with two parallel lines centered on the panel. The rectangular dimensions of the scribe shall have a top width of 2 in. (50 mm) and a height of 4 in. (100 mm). The scribe cut shall expose the steel substrate as verified with a microscope.
c.Zinc-Rich Primer Requirements.
1.Generic Type. This material shall be an organic zinc-rich epoxy or urethane primer. It shall be suitable for topcoating with epoxies, urethanes, and acrylics.
2.Zinc Dust. The zinc dust pigment shall comply with ASTM D 520, Type II.
3.Slip Coefficient. The organic zinc coating shall meet a Class B AASHTO slip coefficient (0.50 or greater) for structural steel joints using ASTM F 3125 Grade A 325 or A 490 (F 3125M Grade A 325M or A 490M) bolts.
4.Adhesion. The adhesion to an abrasively blasted steel substrate shall not be less than 900 psi (6.2 MPa) when tested according to ASTM D 4541, Annex A4.
5.Unit Weight. The unit weight of the mixed material shall be within 0.4 lb/gal (0.048 kg/L) of the original qualification sample unit weight when tested according to ASTM D 1475.
6.Percent Solids by Weight of Mixed Primer. The percent solids by weight for the mixed material shall be a minimum of 70 percent and shall not vary more than ±2 percentage points from the percent solids by weight of the original qualification samples when tested according to ASTM D 2369.
7.Percent Solids by Weight of Vehicle Component. The percent solids by weight of the vehicle component shall not vary more than ±2 percentage points from the percent solids by weight of the original qualification samples when tested according to ASTM D 2369. Structural Steel Coatings Art. 1008.05
8.Viscosity. The viscosity of the mixed material shall not vary more than ±10 Krebs Units from the original qualification sample viscosity when tested according to ASTM D 562 at 77 °F (25 °C).
9.Dry Set to Touch. The mixed material when applied at 6 mils (150 microns) wet film thickness shall have a dry set to touch of 30 minutes or less when tested according to ASTM D 1640 at 77 °F (25 °C).
10.Pot Life. After sitting eight hours at 77 °F (25 °C), the mixed material shall not show curdling, gelling, gassing, or hard caking.
d.Intermediate Coat Requirements.
1.Generic Type. This material shall be an epoxy or urethane. It shall be suitable as an intermediate coat over inorganic and organic zinc primers and compatible with acrylic, epoxy, and polyurethane topcoats.
2.Color. The color of the intermediate coat shall be white, off-white, or beige.
3.Unit Weight. The unit weight of the mixed material and the unit weight of the individual components shall be within 0.20 lb/gal (0.024 kg/L) of the original qualification sample unit weights when tested according to ASTM D 1475.
4.Percent Solids by Weight. The percent solids by weight for the mixed material shall not vary more than ±2 percentage points from the percent solids by weight of the original qualification samples when tested according to ASTM D 2369.
5.Dry Time. The mixed material shall be dry to touch in two hours and dry hard in eight hours when applied at 10 mils (255 microns) wet film thickness and tested according to ASTM D 1640.
6.Viscosity. The viscosity of the mixed material shall not vary more than ±10 Krebs Units from the original qualification samples when tested according to ASTM D 562 at 77 °F (25 °C).
7.Pot Life. After sitting two hours at 77 °F (25 °C), the mixed material shall not show curdling, gelling, gassing, or hard caking.
e.Urethane Finish Coat Requirements.
1.Generic Type. This material shall be an aliphatic urethane. It shall be suitable as a topcoat over epoxies and urethanes.
2.Color and Hiding Power. The finish coat shall match Munsell Glossy Color 7.5G 4/8 Interstate Green, 2.5YR 3/4 Reddish Brown, 10B 3/6 Blue, or 5B 7/1 Gray. The color difference shall not exceed 3.0 Hunter Delta E Units. Color difference shall be measured by instrumental comparison of the designated Munsell standard to a minimum dry film Art. 1008.05 Structural Steel Coatings thickness of 3 mils (75 microns) of sample coating produced on a test panel according to ASTM D 823, Practice E, Hand–Held, Blade Film Application. Color measurements shall be determined on a spectrophotometer with 45 degrees circumferential/zero degrees geometry, illuminant C, and two degrees observer angle. The spectrophotometer shall measure the visible spectrum from 380-720 nanometers with a wavelength interval and spectral bandpass of 10 nanometers.
3.Contrast Ratio. The contrast ratio of the finish coat applied at 3 mils (75 microns) dry film thickness shall not be less than 0.99 when tested according to ASTM D 2805.
4.Weathering Resistance. Test panels shall be aluminum alloy measuring 12 x 4 in. (300 x 100 mm) prepared according to ASTM D 1730, Type A, Method 1 Solvent Cleaning. A minimum dry film thickness of 3 mils (75 microns) of finish coat shall be applied to three test panels according to ASTM D 823, Practice E, Hand Held Blade Film Application. The coated panels shall be cured at least 14 days at 75 °F ± 2 °F (24 °C ± 1 °C) and 50 ± 5 percent relative humidity. The panels shall be subjected to 300 hours of accelerated weathering using the light and water exposure apparatus (fluorescent UV - condensation type) as specified in ASTM G 53-96 and ASTM G 154 (equipped with UVB-313 lamps). The cycle shall consist of eight hours UV exposure at 140 °F (60 °C) followed by four hours of condensation at 104 °F (40 °C). After exposure, rinse the panel with clean water; allow to dry at room temperature for one hour. The exposed panels shall not show a color change of more than 3 Hunter Delta E Units.
5.Dry Time. The mixed material shall be dry to touch in two hours and dry hard in six hours when applied at 6 mils (150 microns) wet film thickness and tested according to ASTM D 1640.
f.Three Coat System Requirements.
1.Finish Coat Color. For NTPEP testing purposes, the color of the finish coat shall match the applicable AASHTO R 31 specified color.
2.Salt Fog. When tested according to ASTM B 117 and evaluated according to AASHTO R 31, the paint system shall exhibit no spontaneous delamination and not exceed the following acceptance levels after scraping after 5,000 hours of salt fog exposure. Salt Fog Acceptance Criteria Blister Criteria Rust Criteria Conversion Value Maximum Creep Average Creep 9 4 mm 2 mm
3.Cyclic Exposure. When tested according to ASTM D 5894 and evaluated according to AASHTO R 31, the paint system shall exhibit no Structural Steel Coatings Art. 1008.06 spontaneous delamination and not exceed the following acceptance levels after 5,000 hours of cyclic exposure. Cyclic Exposure Acceptance Criteria Blister Criteria Rust Criteria Conversion Value Maximum Creep Average Creep 9 7 mm 4 mm
4.Abrasion. The abrasion resistance shall be evaluated according to ASTM D 4060 using a Taber Abrader with a 2.20-lb (1000-gram) load and CS 17 wheels. The duration of the test shall be 1,000 cycles. The loss shall be calculated by difference and be less than 0.00049 lb (220 mgs).
5.Adhesion. The adhesion to an abrasively blasted steel substrate shall not be less than 900 psi (6.2 MPa) when tested according to ASTM D 4541, Annex A4.
6.Freeze Thaw Stability. There shall be no reduction of adhesion, which exceeds the test precision, after 30 days of freeze/thaw/immersion testing. One 24-hour cycle shall consist of 16 hours of approximately -22 °F (-30 °C) followed by four hours of thawing at 122 °F (50 °C) and four hours tap water immersion at 77 °F (25 °C). The test panels shall remain in the freezer mode on weekends and holidays.
g.Sampling, Testing, Acceptance, and Certification. Sampling, testing, acceptance, and certification of the coating system shall be according to
1008.06 Moisture Cured Urethane Paint System. The moisture cured
urethane paint system shall consist of an aromatic moisture cured urethane primer, an aromatic moisture cured urethane intermediate coat, and aliphatic moisture cured urethane finish coat. It is intended for field painting blast-cleaned existing structures.
1.Compatibility. Each coating in the system shall be supplied by the same paint manufacturer.
2.Toxicity. Each coating shall contain less than 0.01 percent lead in the dry film and no more than trace amounts of hexavalent chromium, cadmium, mercury, or other toxic heavy metals.
3.Volatile Organics. The volatile organic compounds of each coating shall not exceed 2.8 lb/gal (340 g/L) as applied.
b.Test Panel Preparation.
1.Substrate and Surface Preparation. Test panels shall be ASTM A 36, hot-rolled steel measuring 4 x 6 in. (100 x 150 mm). Panels shall be blast-cleaned per SSPC–SP5 white metal condition using recyclable Art. 1008.06 Structural Steel Coatings metallic abrasive according to SSPC AB-3. The abrasive shall be a 60/40 mix of shot and grit. The shot shall be an SAE shot number S230 and the grit an SAE number G40. Hardness of the shot and grit shall be Rockwell C45. The anchor profile shall be 1.5-2.5 mils (40-65 microns) measured according to ASTM D 4417, Method C.
2.Application and Curing. All coatings shall be spray applied at the manufacturer's recommended film thickness. The coated panels shall be cured at least 30 days and not more than 45 days at 77 F 2 F (25 C 2 C) and 65 ± 5 percent relative humidity.
3.Scribing. The test panels shall be scribed according to ASTM D 1654 with two parallel lines centered on the panel. The rectangular dimensions of the scribe shall have a top width of 2 in. (50 mm) and a height of 4 in. (100 mm). The scribe cut shall expose the steel substrate as verified with a microscope.
4.Number of Panels. All testing shall be performed on triplicate panels.
c.Zinc-Rich Primer Requirements.
1.Generic Type. This material shall be a single component zinc-rich aromatic moisture cured urethane primer. It shall be suitable for topcoating with urethanes.
2.Zinc Dust. The zinc dust pigment shall be according to ASTM D 520, Type II.
3.Slip Coefficient. The organic zinc coating shall meet a Class B AASHTO slip coefficient (0.50 or greater) for structural steel joints using ASTM F 3125 (F 3125M) Grade A 325 (A 325M) or A 490 (A 490M) bolts.
4.Adhesion. The adhesion to an abrasively blasted steel substrate shall not be less than 900 psi (6.2 MPa) when tested according to ASTM D 4541 Annex A4.
d.Intermediate Coat Requirements.
1.Generic Type. This material shall be a single component aromatic moisture cured urethane. It shall be suitable as an intermediate coat over the primer and compatible with the finish coat.
2.Color. The color of the intermediate coat shall provide a distinct contrast between the primer and the finish coat.
e.Urethane Finish Coat Requirements.
1.Generic Type. This material shall be a single component aliphatic moisture cured urethane. It shall be suitable as a topcoat over the intermediate coat. Structural Steel Coatings Art. 1008.06
2.Color and Hiding Power. The finish coat shall match Munsell Glossy Color 7.5G 4/8 Interstate Green, 2.5YR 3/4 Reddish Brown, 10B 3/6 Blue, or 5B 7/1 Gray. The color difference shall not exceed 3.0 Hunter Delta E Units. Color difference shall be measured by instrumental comparison of the designated Munsell standard to a minimum dry film thickness of 3 mils (75 microns) of sample coating produced on a test panel according to ASTM D 823, Practice E, Hand–Held, Blade Film Application. Color measurements shall be determined on a spectrophotometer with 45 degrees circumferential/zero degrees geometry, illuminant C, and two degrees observer angle. The spectrophotometer shall measure the visible spectrum from 380- 720 nanometers with a wavelength interval and spectral bandpass of 10 nanometers. The contrast ratio of the finish coat at 3 mils (75 microns) dry film thickness shall not be less than 0.99 when tested according to ASTM D 2805.
3.Accelerated Weathering Resistance. Test panels shall be aluminum alloy measuring 12 x 4 in. (300 x 100 mm) prepared according to ASTM D 1730 Type A, Method 1 Solvent Cleaning. A minimum dry film thickness of 3 mils (75 microns) of finish coat shall be applied to three test panels according to ASTM D 823, Practice E, Hand Held Blade Film Application. The coated panels shall be cured at least 30 days and not more than 45 days at 77 F ± 2 F (25 C ± 2 C) and 65 ± 5 percent relative humidity. The panels shall be subjected to 300 hours of accelerated weathering using the light and water exposure apparatus (fluorescent UV - condensation type) as specified in ASTM G 53-96 and ASTM G 154 (equipped with UVB-313 lamps). The cycle shall consist of eight hours UV exposure at 140 F (60 C) followed by four hours of condensation at 104 F (40 C). After exposure, the panel shall be rinsed with clean water and allowed to dry at room temperature for one hour. The exposed panels shall not show a color change of more than 3 Hunter Delta E Units.
f.Three Coat System Requirements.
1.Finish Coat Color. For testing purposes, the color of the finish coat shall match Aerospace Material Specification Standard 595 14062 (Dark Green).
2.Salt Fog. When tested according to ASTM B 117 and evaluated according to AASHTO R 31, the paint system shall exhibit no spontaneous delamination and not exceed the following acceptance levels after 5,000 hours of salt fog exposure. Salt Fog Acceptance Criteria (max.) Blister Conversion Value Rust Criteria After 4000 Hours Maximum Creep Average Creep 10 6 mm 2 mm Art. 1008.06 Structural Steel Coatings
3.Cyclic Exposure. When tested according to ASTM D 5894 and evaluated according to AASHTO R 31, the paint system shall exhibit no spontaneous delamination and not exceed the following acceptance levels after 5,000 hours of cyclic exposure. Cyclic Exposure Acceptance Criteria (max.) Blister Conversion Value Rust Criteria Maximum Creep Average Creep 10 13 mm 7 mm
4.Adhesion. The adhesion to an abrasively blasted steel substrate shall not be less than 900 psi (6.2 MPa) when tested according to ASTM D 4541 Annex A4.
5.Freeze Thaw Stability. There shall be no reduction of adhesion, which exceeds the test precision, after 30 days of freeze/thaw/immersion testing. One 24-hour cycle shall consist of 16 hours of approximately - 22 F (-30 C) followed by four hours of thawing at 122 F (50 C) and four hours tap water immersion at 77 F (25 C). The test panels shall remain in the freezer mode on weekends and holidays.
g.Qualification Samples and Tests. The manufacturer shall supply, to an independent test laboratory and to the Department, samples of the moisture cured zinc-rich urethane primer, moisture cured urethane intermediate coat, and moisture cured aliphatic urethane finish coats for evaluation. Prior to approval and use, the manufacturer shall submit a notarized certification of the independent laboratory, together with results of all tests, stating that these materials meet the requirements as set forth herein. The certified test report shall state lots tested, manufacturer’s name, product names, and dates of manufacture. New certified test results and samples for testing by the Department shall be submitted any time the manufacturing process or paint formulation is changed. All costs of testing, other than tests conducted by the Department, shall be borne by the manufacturer.
h.Acceptance Samples and Certification. A 1 qt (1 L) sample of each lot of paint produced for use on state or local agency projects shall be submitted to the Department for testing, together with a manufacturer’s certification. The certification shall state that the formulation for the lot represented is essentially identical to that used for qualification testing. All acceptance samples shall be witnessed by a representative of the Illinois Department of Transportation. The moisture cured zinc-rich primer, moisture cured urethane intermediate coat, and moisture cured aliphatic urethane finish coat shall not be used until tests are completed and they have met the requirements as set forth herein. 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.
Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 819–830 of 1,217.
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