231.01 Description.
the required grade, section, and density as noted herein in this Section and includes all equipment, tools, labor, and incidentals necessary to complete the work as described herein.
b.Payment will be made under Item No .: 230-A Roadbed Processing - per Roadbed Station STABILIZED ROADBED
231.01 Description.
This Se ction shall cover the work of preparing a roadbed for receiving a base and pavement structure by stabilizing it with an approved local or commercial material. The work shall consist of scarifying the roadbed, incorporating the stabilizing material into the roadbed, and compacting the roadbed to the proper grade, section, and density. When stabilizing material is present on the roadway surface, the work shall consist of incorporating the stabilizing aggregate into the roadbed and compacting the roadbed surfa ce to the proper grade, section, and density.
231.02 Materials.
The stabilizing material to be incorporated shall be an approved local or commercial material of the type provided by the plans or proposal,
231.03 Construction Requirements.
a.General . Choice of equipment to perform the work under this Section shall, in general, be that of the Contractor provided such produces the desired results noted herein and does not damage or injure any completed work or facility designated to be incorporated into the work.
b.Preparation of the Roadbed . The roadbed shall have been prepared in accordance with the provisions of Section 210. The designated sections of the roadbed of the width specified on the plans of both cuts and fills shall then be scarified or otherw ise loosened for the depth specified by the plans or as directed. Certain equipment capable of mixing the stabilizing material and the material in place without pre -working the in-place material may permit combining this step with the requirements of Subarticle (c) below.
c.Placement and Processing of Stabilizing Material . The approved stabilizing material shall be spread uniformly over the roadbed, at the rate specified on the plans or as directed, by approved spreading equipment. The stabilizing materia l shall then be mixed with the subgrade material until uniform in color and texture as directed and compacted to the required grade, section, and density.
d.Density and Surface Requirement . Density and surface requirements shall be the same as specified in Subarticle 230.03(d) and (e), respectively.
e.Protection and Maintenance of Roadbed . Protection and maintenance of roadbed shall be the same as specified in Subarticle 230.03(f).
231.04 Method of Measurement.
All accepted stabilizing material ordered and accepted will be measured in cubic yards {cubic meters}, loose measurement, or per ton {metric ton}. Stabilizing Roadbed with In -Place Material will be measured in units of Roadbed Station as described in Article 230.04.
231.05 Basis of Payment.
a.Unit Price Coverage . The accepted volume of Roadbed Stabilizing Material, measured as noted above in accordance with the method provided in the contract (cubic yard {cubic meter} or ton {metric ton}), will be paid for at the contract unit price bid w hich shall be full compensation for the item complete in place on the roadbed. Said unit price shall include all cost of procurement, hauling, spreading, scarifying,
232.03 Construction Requirements.
mixing, and processing as required to incorporate the stabilizing material to the specified depth, to obtain and maintain the required grade, section, and density of the roadbed until covered by an overlying layer of ordered material and includes all equipment, tools, labor, and incidentals necessary to complete the work. The contract unit pric e for Stabilizing Roadbed with In -Place Material, shall be full compensation for all equipment, tools, labor, and incidentals required for mixing, and processing, as required to incorporate the stabilizing material to the specified depth. It shall also be full compensation for obtaining and maintaining the required grade, section, and density of the roadbed until covered by an overlying layer.
b.Payment will be made under Item No .: 231-A Roadbed Stabilizing Material, Type Material - per cubic yard {cubic meter} 231-B Roadbed Stabilizing Material, Type Material - per ton {metric ton} 231-C Stabilizing Roadbed with In -Place Material per Roadbed Station SECTION 232 LIME STABILIZED ROADBED
232.01 Description.
This Section shall cover the work of preparing a roadbed for an overlying base and paving structure by stabilizing it with a lime treatment. The work shall consist of scarifying the roadbed, incorporation of lime, and the necessary p rocessing thereof in accordance with one of the following methods to the proper grade, section, and density. Class 1 Lime Stabilization shall consist of spreading and incorporating the specified percentage of lime in two increments in the following sequenc e: spreading the first increment, initial mixing, mellowing, spreading the second increment, final mixing, compacting, and finishing in accordance with these specifications. Mellowing is defined as the process of softening to a loamy consistency. Class 2 L ime Stabilization shall consist of spreading the specified percentage of lime, initial mixing, mellowing, final mixing, compacting, and finishing in accordance with these specifications. Class 3 Lime Stabilization shall consist of spreading the specified p ercentage of lime, mixing, compacting, and finishing in accordance with these specifications.
232.02 Materials.
All material furnished for use shall comply with the requirements of the appropriate Sections of
Division 800 — , Materials . Water shall meet the r equirements of Article 807.03; lime shall meet the
requirements of Section 817. The soil used in the stabilization shall consist of existing roadbed material or material added as directed. Particles of aggregate larger than those passing the 3 inch {75 mm } sieve, and deleterious substances such as roots, stumps, grass turfs, and other vegetable matter shall be removed from the soil.
232.03 Construction Requirements.
a.General . The basic requirement for work under this Section is to obtain a completed lay er or layers of roadbed material containing a uniform lime mixture, with a smooth, closely knit surface, free from cracks, loose or segregated areas, and constructed to the proper depth, width, and surface requirement as specified. Quantities and percentages of lime shown on the plans and proposal are based on preliminary soil investigation and dry laboratory sample tests. The actual application rate will be established from dry density tests made just prior to beginning stabilization work. The ini tial tests are based on Hydrated lime. If Quicklime is used and placed directly on the roadbed in pebble form, the percentage will be adjusted by the Engineer based on a factor of 0.833 times the hydrated lime percentage required. While either hydrated lim e or quicklime may be used on different segments of the project, a second application of lime must be of the same type used in the first application. It is necessary to the quality of lime treated materials that all such materials be kept moist at all times. It shall be the Contractor's responsibility to provide sufficient equipment and keep all partially constructed or completed lime stabilized layers sufficiently and continuously moist until a succeeding layer has been placed thereon or until final accept ance of the project.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 147–147 of 934.