Item 204 – Portland Cement Stabilized Road Mix Base Course

204.1 Description

• Foundation for surface source

- soil-aggregate

- Portland Cement

- Water

• In proper proportions

204.2 Materials Requirements

• Soil Aggregate

-conforms to Subsection 203.2.1

• Portland Cement

- conforms to Item 700

• Water

- conforms to Item 714

204.2 Materials Requirements

• Proportioning

- amount of cement added to soil-aggregate is from 6 – 10 mass percent of dry soil.

- exact percentage shall be fixed by the Engineer based on preliminary tests and trial mixes.

• Strength Requirements

- conforms to Subsection 203.2.5

204.3 Construction Requirements

• prescribed under Subsections 203.3.1 through 203.3.10.

• in all cases, “lime” shall be deleted and replaced with “Portland Cement”

204.4 Method of Measurement

• PC Stabilized Road Mix Base Course

- in cubic meter

• Quantity to be paid shall be the design volume

• No allowance shall be given for mat’ls placed outside the design limit

• Trial sections shall be included

204.5 Basis of Payment

• Paid for at the Contract Unit Price for PC Stabilized Road Mix Base Course

• Full furnishing, all labor, equipment, tools and incidentals are included.

Item 205 – Asphalt Stabilized Road Mix Base Course

205.1 Description

• Foundation for Surface Course

- soil-aggregate

- asphaltic material

205.2 Material Requirements

• Soil-aggregates

- conforms to Item 703, Gradation A or B shall be used

• Asphaltic Material

- Anionic or Cationic Emulsified Asphalt, conforms to Item 702

205.2 Material Requirements

• Proportioning

- 4 – 7 mass percent of the dry soil-aggregate.

- exact percentage shall be fixed by the Engineer

• Strength Requirements

- conforms to Subsection 203.2.5

205.3 Construction Requirements

• Prescribed under Subsections 306.3.1 through 306.3.7

• In all cases, the word “aggregate” shall be deleted and replaced by “Soil-aggregate”

• Trial sections shall conform to Subsection 200.3.4

• Allowable tolerance shall be in accordance with Subsection 201.3.5

205.4 Method of Measurement

• Asphalt Stabilized Road Mix Base Course

- in cubic meters

• No allowance to be given for mat’ls placed outside the design limits

• Trial sections are included in the quantity

205.5 Basis of Payment

• Paid for at the Contract Unit Price for Asphalt Stabilized Road Mix Based Course

• Full furnishing, all labor, equipment, tools and incidentals are included.

Item 206 – Portland Cement Treated Plant Mix Base Course

206.1 Description

• Foundation for surface source

- soil-aggregate

- Portland Cement

- Water

mixed by a travel plant or in a central plant

• In proper proportions

206.2 Materials Requirements

• Same as 204.2.1 to 204.2.5

206.3 Construction Requirements

• Weather Limitations

- PC shall not be applied during windy, rainy, or impending bad weather.

• Travel Plant Method

- new soil aggregate shall be pulverized until 80 mass percent can pass through No.4 sieve

- Mat’ls retained on 50 mm sieve shall be removed

206.3 Construction Requirements

• Travel Plant Method

- subgrade/subbase shall support all equip required in the construction of the base course

- soil-aggregate to be treated be placed in a uniform windrow

- specified quantity of PC shall be applied uniformly

206.3 Construction Requirements

• Travel Plant Method

- mixing shall be accomplished by means of a mixer

- maximum of 2 hrs shall be permitted for wet mixing, laydown, and finishing

• Central Plant Method

- soil-aggregate shall be proportioned and mixed with cement and water in a central mixing plant.

206.3 Construction Requirements

• Spreading, Compacting and Finishing

- mixture shall be spread on a prepared and moistened subgrade/subbase

-no more than 60 mins shall elapse between start of mixing and start of compaction

- after spreading, compaction then finishing

206.3 Construction Requirements

• Protection, Curing and Maintenance

- completed cement shall be cured with a bituminous curing seal

• Trial Section

- same as 203.3.8

• Tolerances

- same as 203.3.9

• Traffic

- same as 203.3.10

206.4 Method of Measurement

• PC Treated Plant Mix Base Course

- in cubic meter

• Quantity to be paid shall be the design volume

• No allowance shall be given for mat’ls placed outside the design limit

• Trial sections shall be included

206.5 Basis of Payment

• Paid for at the Contract Unit Price for PC Treated Plant Mix Base Course

• Full furnishing, all labor, equipment, tools and incidentals are included.

Item 207 – Aggregate Stockpile

207.1 Description

• Furnishing and placing aggregate in stockpiles

207.2 Materials Requirements

• Conform to all requirements of specified Item Number

• Test for acceptance at the source

207.3 Construction Requirements

• shall be graded, shaped and compacted to a uniform cross section

• In accordance with Clause 65 and 67

207.4 Method of Measurement

• Aggregate Stockpile

- in cubic meter

207.5 Basis of Payment

• Paid for at the Contract Unit Price for Aggregate Stackpile

• Full furnishing, all labor, equipment, tools and incidentals are included.