817LIME FOR ROADBED AND BASE STABILIZATION

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dampness. Cement not for immediate use shall be stored in suitable weatherproof buildings. Buildings shall be placed in approved locations. Provisions for storage shall be ample and the shipment of cement as received shall be separately stored in such a manner as to provide easy access for identification and inspection of each shipment. On small structures, storage in the open may be permitted by authorization, in which case a raised platform and ample waterproof covering shall be provided. Stored cement shall meet the test requirements at any time after storage when a retest is ordered.

be mixed. LIME FOR ROADBED AND BASE STABILIZATION

817.01Hydrated Lime

Hydrated lime shall be high calcium (Type 1) and shall conform to AASHTO M 216 when tested in accordance with AASHTO T 219. Hydrated lime shall be stored and handled in water-proof containers until immediately before distribution to the road. If storage bins are used, they shall be completely enclosed. Hydrated lime in bags shall be stored in weatherproof buildings with adequate protection from ground dampness.

817.02Quicklime

Quicklime shall meet the requirements of AASHTO M 216 after hydration in the laboratory. Quicklime shall be handled and stored in waterproof containers until used. Accidental contact with water shall be avoided. When quicklime is to be applied directly to the roadbed, the following additional requirements shall apply: For 3/4 inch {19.0 mm} Quicklime (“Pebble”) Sieve % Passing by Weight (Mass) 3/4 inch {19.0 mm} 90 - 100 1/4 inch {6.5mm} 30 - 80 No. 10 {2.0 mm} 0 - 60

For top-size 3/8 inch (9.5 mm} Quicklime (“Fines”) Sieve Min. % Passing by Weight (Mass) 3/8 inch {9.5 mm} 100 No. 10 {2.0 mm} 30

817.03Lime Kiln Dust

Lime kiln dust (LKD) is a by-product of making lime. LKD shall be stored and handled in water-proof containers until immediately before distribution to the road. LKD shall meet the following requirements when tested in accordance with ASTM C 25: Combined total calcium oxide and magnesium oxide 50 % minimum Available calcium hydroxide (rapid sugar test, ASTM C 25), plus total MgO content calculated to be equivalent Ca(OH)2 30 % minimum Loss on ignition (carbon dioxide plus moisture, combined and free on as-received basis) 40 % maximum Free water (as-received basis) 4 % maximum Sulfur as SO3 10 % maximum Sieve analysis. Sieve Size Min. % Passing by Weight (Mass) No. 4 {4.75 mm} 95 No. 30 {600 µm} 90 No. 100 {150 µm} 75 SELECTED MATERIALS FOR BASES 689

SELECTED MATERIALS FOR BASES

820.01Description

Selected materials for the purpose of these specifications shall be of the kind and general character of sand-clay, chert, clay-gravel, sand, local stone, stone screenings, etc., or combinations thereof, with or without commercial aggregate meeting the requirements noted in this Section.

820.02General Requirements

The material shall meet the general requirements for the respective material noted in this Article and the special and specific requirements noted in Article 820.03. The following terms are defined for general use. Artificial Mixture . The term "Artificial Mixture" is defined as a mixture, resulting from combining as indicated on the plans or as directed, of two or more base course materials, including binder soils suitable for the purpose intended and sands of the same or different kind generally from separate sources. Coarse Aggregate and Binder Soil (Binder). The coarse aggregate for base courses shall be all material retained on the No. 8 {2.36 mm} sieve; binder shall be all materials passing the No. 8 {2.36 mm} sieve. Blends. Blends shall be an artificial mixture of (1) two or more materials of the kind and/or character described in this Section or similar materials; (2) one or more soils plus stabilizer aggregate or either local stone, commercial coarse aggregate meeting the provisions of Section 801 with size number designated on the plans, or processed reef shell meeting provisions of Section 827.

Sand clay shall be a natural material or artificial mixture, consisting largely of a mixture of sand and clay in proper proportions, that occurs in natural deposits of varying depths or a blended mixture of sand and clay.

Chert shall be a metamorphic, fragmentary, flint or silica formation interspersed with varying quantity and quality of clay binder. Chert in its natural formation may require blasting to facilitate loading and manipulation.

Clay gravel shall be composed of gravel and sand with clay binder. The coarse aggregate (gravel) shall be clean, hard, tough, durable, and reasonably free from thin, elongated, soft, or laminated pieces. The binder, consisting of material passing the No. 8 {2.36 mm} sieve, shall be a good grade of sand clay or other approved material. Clay gravel in its natural formation may require blasting to facilitate loading and manipulation.

Local sand shall consist of grains of hard, sound material, predominantly quartz or other hard, durable rock, including friable, loosely bound deposits of sandstone conglomerate normally found in natural deposits in the project vicinity.

Local sand-gravel shall be hard, sound, durable rock, including friable, loosely bound sand-stone conglomerate, with varying amounts of coarse aggregate and sand normally found in natural deposits in the project vicinity. The coarse aggregate and the sand shall be free from a coating of injurious material, lumps of clay, loam, organic matter, or other foreign material. If necessary, gradation and/or other requirements will be provided in the plans and/or proposal form.

Approved local source-run stone shall consist of tough, durable fragments and sand, clay, or other binder type materials. If necessary, gradation and/or other requirements will be provided in the plans or proposal.