CALICHE BASE 305.04
303.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.AGGREGATE BASE TYPE A Cubic Yard [Cubic Meter]
B.AGGREGATE BASE TYPE A, PLANT MIXED Cubic Yard [Cubic Meter]
C.AGGREGATE BASE TYPE B Cubic Yard [Cubic Meter]
D.AGGREGATE BASE TYPE B, PLANT MIXED Cubic Yard [Cubic Meter]
E.AGGREGATE BASE TYPE C Cubic Yard [Cubic Meter]
F.AGGREGATE BASE TYPE C, PLANT MIXED Cubic Yard [Cubic Meter]
305.01 Description
This work consists of constructing a base of approved deposits of calcareous and siliceous material constructed on the prepared subgrade.
305.02 Materials
Provide materials in accordance with Subsection 703.09, “Caliche Base.”
305.03 Equipment — Vacant
305.04 Construction Methods
A.Preparation of Subgrade Prepare the subgrade in accordance with Subsection 310.04.B, “Subgrade Method B for All Other Subbases, Bases, Pavement, or Surface, ” before placing the new subbase and base course material on the roadbed. Pulverize the existing surface and base materials and place the materials to establish the new subgrade in accordance wi th Section 311, “Processing Existing Base and Surface, ” or as shown on the Plans.
B.Mixing and Placing If material is to be combined and blended on the roadbed, deliver weighed material and place it in measured windrows, each in the proper proportions before blending. Do not exceed the amount that can be uniformly mixed by the equipment on the project during one day's operation.
307.01 Subgrade Treatment
182 Before mixing is complete, uniformly moisten the mixture for the length of the section being treated to ensure workability and prevent excess wet and dry spots in the finished blend. Avoid using excess water during mixing and placing to prevent undue softening of the subgrade.
C.Spreading Spread the caliche base material uniformly over the length and wi dth of the section after the Resident Engineer tests and approves the blended windrow. Prevent segregation of the mixture. Ensure that the thickness of each layer of caliche base material does not exceed the compaction equipment’s capability to obtain th e specified density.
D.Compaction -Density Uniformly moisten each layer during compaction and continue rolling to produce a density of at least 100 percent of maximum density, determined in accordance with AASHTO T 99.
E.Tolerances Finish the caliche base in accordance with Subsection 301.04.A, "Tolerances. "
305.05 Method of Measuremen T
The Resident Engineer will measure the volume of the compacted in -place Caliche Base by multiplying the completed length of caliche b ase by the area of the typical section shown on the Plans.
305.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: CALICHE BASE Cubic Yard [Cubic Meter] SECTION 307 SUBGRADE TREATMENT
307.01 Description
This work consists of providing, placing, and compacting one or more layers of a mixture of soil, chemical additives, and water to achieve a stable subgrade. Chemical additives used to stabilize or modify are defined as cementitious additives (portland cement, fly ash, or cement kiln dust) or lime additives.
A.Subgrade Stabilization Incorporate chemical additives into the subgrade to increase the strength of t he subgrade soils and to provide structural value for the pavement structure.
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Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 195–195 of 935. View official source ↗