07/24/01
22.1
SECTION 22
BASE MATERIAL
22-1 LIME TREATED BASE
Road-mixed lime treated base shall be constructed in accordance with Section 24, “Lime
Stabilization”, of the State Specifications.
Lime to be mixed with the existing material shall conform to the requirements of Section
24-1.02, “Materials”, of the State Specifications.
The percentage of hydrated lime to be added by weight shall be as specified in the Special
Provisions.
Lime treated base shall be compacted to a minimum relative compaction of ninety-five percent
(95%).
22-2 AGGREGATE BASE
Aggregate base shall conform to Section 26, “Aggregate Bases”, of the State Specifications,
and these Specifications.
The Contractor may propose the use of recycled portland cement concrete or asphalt concrete
materials for aggregate base. The amount of reclaimed material shall not exceed fifty percent
(50%) of the total volume of the aggregate used. The Contractor shall submit to the Agency
material samples and laboratory test data certifying that the proposed materials meet all the
quality requirements of Section 26 of the State Specifications, and these Specifications. The
Contractor may not propose to use recycled asphalt concrete, generated from asphalt concrete
removed from within the area of work, for aggregate base unless the recycled material is
surplus material from the Work. Proposed recycled materials shall not be used in the Work
unless approved in writing by the Agency. Data and samples shall be submitted at least thirty
(30) days prior to expected use of the proposed materials in the Work.
The material shall be deposited on the roadbed in such a manner as to provide a uniform
section of material within five percent (5%) tolerance of the predetermined required volume.
Deposition shall be by methods that prevent segregation of the material. The deposited
material shall contain sufficient moisture to prevent segregation. Aggregate base material shall
be immediately spread to its planned grade and cross section. Segregation or excessive
drifting or spotting of material will not be permitted. Any material determined by the Agency to
be unsuitably segregated, shall be removed from the roadbed or completely reworked to provide
the desired uniformity of the material.
The Contractor is responsible for maintaining the required moisture content until the next
successive layer of material is placed. No additional compensation will be paid for water
applied to the aggregate base after the material has been weighed.
Aggregate bases shall be compacted to a minimum relative compaction of ninety-five percent
(95%) as determined by California Test Method No. 231.
The surface of the finished aggregate base at any point shall not vary more than 0.05-foot
above or below the grade established by the Agency.
22-3 CEMENT TREATED BASES
Road-mixed and plant-mixed cement treated bases shall be in accordance with Section 27,
“Cement Treated Bases”, of the State Specifications.



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