d270.doc - SECTION 270 SOIL-CEMENT BASE 270-1 Description...

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SECTION 270 SOIL-CEMENT BASE 270-1 Description. Construct a base course composed of a combination of soil, portland cement, and water. 270-2 Materials. Meet the following requirements: Cement: Portland Cement, Type I, II, III, or Type IP or Type IS ........................ Section 921 Water: Use water that is free from substances deleterious to hardening of the soil-cement mixture. Curing Material: .......................................................................................................... 916-4 Use Emulsified Asphalt Grade SS, RS, or MS as approved by the Engineer. Dilute these as recommended by the manufacturer. Soil: For base course construction, use either the material existing in the location to be occupied by the base, a suitably friable material furnished by the Contractor, or a combination of these. If the material existing in the location to be occupied by the base does not meet the requirements specified below, remove and replace it with suitable soil. Obtain approval of the material pits prior to use. Excavate material pits to achieve a uniformly mixed material with reasonably consistent characteristics. Blend strata or differing materials in accordance with a procedure approved by the Engineer. The Department will consider proposed recycled materials on a case by case basis. Specific Requirements For Soil: Organic Material (As per FM 1-T267) .................... Maximum 5% Total Clay and Silt Content (minus No. 200 [75μm sieve) (As per AASHTO T 88, no hydrometer test) ................................................ Maximum 25% Plastic Index (As per AASHTO T 90) .................. Maximum 10% Liquid Limit (As per AASHTO T 89) ................... Maximum 25% Gradation: (As per AASHTO T 88) Passing 2 inch [50 mm] sieve .................. Minimum 100% Passing No. 4 [4.75 mm] sieve .................. Minimum 55% Passing No. 10 [2.00 mm] sieve ................ Minimum 37% As an exception to the above requirements, the Contractor may use any material meeting the requirements for Limerock in Section 911. 270-3 Proportioning of Mix. 270-3.1 General: Proportion the soil-cement mixture in accordance with Strength Design or Brush Loss Criteria as specified below. Submit for approval a design mix for the soil proposed for use in soil-cement construction prepared by a testing laboratory approved by the Engineer. With the design mix submittal, include the results of tests run to verify that the soil meets the requirements specified in 270-2, results of tests used to establish the cement content, and a final design laboratory sample. Submit the design mix to the Engineer for approval a minimum of 60 calendar days prior to beginning of soil-cement construction for Brush Loss Design Method or 15 calendar days prior to beginning of soil-cement construction for Strength Design Method. The Engineer will perform laboratory testing for design mix evaluation using water from the same source proposed for use during construction. Express the cement as a percentage of the dry unit weight of the soil. For mixed-in-place construction, the Engineer will use a rate of application of cement based on the maximum density of the soil, determined in accordance with AASHTO T 99 and rounded up to the nearest pound per cubic yard [kilogram per cubic meter].
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270-3.2 Strength Design: When proportioning the soil-cement mixture in accordance with strength design, the Engineer will determine the minimum cement content using FM 5-520. Achieve the design
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