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Item 204

This document describes specifications for Portland cement stabilized road mix base course. It will consist of a soil-aggregate, Portland cement and water mixture constructed in layers on a prepared subgrade as the foundation for a surface course. The soil aggregate and Portland cement must meet specified grading and quality requirements. The mixture will contain 6-10% Portland cement by mass as determined by laboratory tests. Payment will be made per cubic meter for material placed within design limits and meeting strength requirements.

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713 views2 pages

Item 204

This document describes specifications for Portland cement stabilized road mix base course. It will consist of a soil-aggregate, Portland cement and water mixture constructed in layers on a prepared subgrade as the foundation for a surface course. The soil aggregate and Portland cement must meet specified grading and quality requirements. The mixture will contain 6-10% Portland cement by mass as determined by laboratory tests. Payment will be made per cubic meter for material placed within design limits and meeting strength requirements.

Uploaded by

Jeffrey Bolima
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ITEM 204 – PORTLAND CEMENT STABILIZED ROAD MIX BASE COURSE

204.1 Description

This Item shall consist of a foundation for surface source composed of soilaggregate,
Portland Cement and water in proper proportions, road-mixed and constructed on a prepared
subgrade/subbase in accordance with this 52 Specification and the lines, grades and typical cross-
sections shown on the Plans or as established by the Engineer

204.2 Material Requirements

204.2.1 Soil Aggregate

It shall conform to the grading and quality requirements of Subsection 203.2.1.

204.2.2 Portland Cement

It shall conform to the requirements of Item 700, Hydraulic Cement.

204.2.3 Water

It shall conform to the requirements of Item 714, Water.

204.2.4 Proportioning of Mixture

The amount of cement to be added to the soil-aggregate shall be from 6 to 10 mass percent
of the dry soil. The exact percentage to be added shall be fixed by the Engineer on the basis of
preliminary laboratory tests and trial mixes of the materials furnished by the Contractor.

204.2.5 Strength Requirements

Strength requirements shall conform in all respects to those specified in Subsection 203.2.5.

204.3 Construction Requirements

Construction requirements and procedures shall be as prescribed under Subsections 203.3.1


through 203.3.10. In all cases, the word ”lime” shall be deleted and replaced with “Portland
Cement”.

204.4 Method of Measurement

Portland Cement Stabilized Road Mix Base Course will be measured by the cubic meter
(m3 ). The quantity to be paid for shall be the design volume compacted in-place as shown on the
Plans, and accepted in the completed course. No allowance shall be given for materials placed
outside the design limits shown on the cross-sections. Trial sections shall not be measured
separately but shall be included in the quantity of Portland Cement Stabilized Road Mix Base Course.

204.5 Basis of Payment

The accepted quantities, measured as prescribed, in Section 204.4, shall be paid for at the
contract unit price for Portland Cement stabilized Road Mix Base Course which price and payment
shall be full compensation for furnishing and placing all materials, including all labor, equipment,
tools and incidentals necessary to complete the work prescribed in this Item.
Payment will be made under:

Pay Item Number Description Unit of Measurement


Portland Cement Stabilized
204 Road Mix Base Course, Cubic meter

(New or Salvaged) Soil-


Aggregate

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