810Roadway Materials

810.1 General Description

This section includes the requirements for the materials used in roadway construction.

810.1.01 Related References

A. Standard Specifications General Provisions 101 through 150. B. Referenced Documents GDT 4 GDT 6 GDT 7 GDT 67

810.2 Materials

810.2.01 Roadway Materials

A. Requirements Do not use materials containing logs, stumps, sod, weeds, or other perishable matter. 1. Classes The materials are divided into six major classes. Classes I, II, and III are further subdivided and identified by description and physical property requirements specified in the table below and in Table 1. Classes IV, V, and VI are identified by descriptive requirements. Class I IA1 and IA2 Medium- to well-graded sand or clayey sand. IA3 Fine-grained, silty, or clayey sand; usually less dense than IA1 or IA2. These soils have an excellent bearing capacity. Class II IIB1, IIB2, and IIB3 Medium- to well-graded sandy clays, sandy silts, and clays with some mica. These soils generally have low volume change properties and good densities that serve well as subgrade material. IIB4 Similar to IIB1, IIB2, and IIB3, but generally contain more mica and are more sensitive to moisture. The bearing value of these soils is less predictable. The soils may or may not be satisfactory for subgrade material. Analyze file data or run laboratory and/or field tests for Class IIB4 when considering it for a subgrade material. Class III IIIC1, IIIC2, IIIC3 and IIIC4 Medium- to fine-graded micaceous sandy silts, micaceous clayey silts, chert clays, and shaly clays. Undesirable characteristics are high volume change properties and/or low densities. The bearing values are unpredictable. The Department recommends testing these materials in a laboratory, where possible, before use. One exception is District 6, where chert clay soils are prevalent. Chert clay soils (IIIC4) with less than 55% passing the No. 10 (2 mm) sieve may be considered suitable for subgrade materials. These soils are found generally in the northwest corner of the state in Dade, Walker, Catoosa, Whitfield, Murray, Chattooga, Gordon, and Floyd counties. Class IV Highly organic soils or peat, muck, and other unsatisfactory soils generally found in marshy or swampy areas. Class V Shaly materials that are not only finely laminated but have detrimental weathering properties and tend to disintegrate. Class VI Rock or boulders that cannot be readily incorporated into the embankment by layer construction, and that contain insufficient material to fill the interstices when they are placed. Table 1: Physical Properties (Material Passing No. 10 (2.00 mm) Sieve) Sub-Class No. 60 (250 µm) Sieve % Passing No. 200 (75 µm ) Sieve % Passing Clay, % Volume Change, % Maximum Dry Density lbs/ft3 (kg/m3) Class I A1 15-65 0-25 0-12 0-10 115+ (1840+) A2 15-85 0-35 0-16 0-12 100+ (1600+) A3 15-100 0-25 0-12 0-18 98+ (1570+) Class II B1 0-30 0-20 0-10 120+ (1920+) B2 0-45 0-30 0-15 110+ (1760+) B3 0-60 0-50 0-20 105+ (1680+) B4 0-75 0-25 90+ (1440+) Class III C1 0-75 0-30 90+ (1440+) C2 0-35 80+ (1280+) C3 0-60 80+ (1280+) C4* 80- (1280-) *Chert clay soils in District 6 having less than 55% passing the No. 10 (2.00 mm) sieve may be considered suitable for subgrade material. B. Fabrication General Provisions 101 through 150. C. Acceptance Test as follows: Test Method Soil gradation GDT 4 Volume change GDT 6 Maximum density GDT 7 or GDT 67 D. Materials Warranty General Provisions 101 through 150.