677508.02 SECTION 508—DEMOLITION OF P A VEMENT AND OBSCURING ROADW AY
508.01 Description
This work shall consist of demolishing existing pavement and obscuring roadway to restore areas that are no longer needed for highway use in accordance with these specifications and in conformity to the lines and contours shown on the plans or as established by the Engineer.
508.02 Procedures
a.Demolition of Pavement Structures:
1.Hydraulic cement concrete pavement: The Contractor shall demolish such pavement accord- ing to the following:
a.Pavement shall be broken into pieces and either used in fill areas as rock embankment in accordance with Section 303 or disposed of at locations selected by the Contractor and approved by the Engineer.
b.Material within the proposed roadway prism and more than 3 feet below the subgrade may be broken into pieces not more than 18 inches in any dimension, sufficiently displaced to allow for adequate drainage, and left in the roadway prism.
2.Asphalt concrete pavement: The Contractor shall remove asphalt concrete pavement that does not overlay or underlie hydraulic cement concrete pavement as follows:
a.Pavement shall be removed and used in the work as designated on the plans or as directed by the Engineer.
b.When approved by the Engineer, pavement shall be removed and disposed of at locations selected by the Contractor.
3.Cement-stabilized courses underlying pavement designated for demolition shall be disposed of in accordance with (a)1.a. or (a)1.b. herein.
4.Aggregate underlying pavement designated for demolition except hydraulic cement concrete pavement disposed of in accordance with (a)1.b. herein shall be salvaged and used for maintenance of traffic or, when approved by the Engineer, disposed of in accordance with (a)2.a. herein.
b.Obscuring Roadway: The Contractor shall obscure existing roadways in accordance with the following procedures:
1.Areas outside construction limits consisting of asphalt concrete or hydraulic cement con- crete pavement demolished in accordance with (a) herin shall be conditioned in accordance with the following:
a.Tops of slopes that do not contain rock shall be rounded for a distance of not more than 10 but not less than 5 feet (where sufficient right of way exists) beyond the point of 678508.02 intersection of the existing slope and the natural ground surface. The depth of the rounding shall be not more than 2 feet below the original surface of slopes.
b.The Contractor shall scarify or plow, harrow and shape disturbed areas that are to receive vegetation.
c.The Contractor shall clear and grub such areas in accordance with Section 301.
2.Areas outside construction limits consisting of pavement structures, other than asphalt concrete or hydraulic cement concrete, that are designated for obscuring roadway shall be conditioned in accordance with (b)1. herein. The Contractor shall remove pavement struc - tures in accordance with the applicable requirements of (a) herein prior to beginning obscuring activities.
508.03 Measurement and Payment
Demolition of hydraulic cement concrete pavement and shoulder structure courses or a combina - tion thereof will be measured as demolition of pavement (rigid) in square yards and will be paid for at the contract unit price per square yard based on the width of the widest course of this pavement type as designated. This price shall include performing all demolition, removing and disposing of pavement, base, subbase and stabilized subgrade materials. Demolition of asphalt concrete pavement and shoulder structure courses or a combination thereof will be measured as demolition of pavement (flexible) in square yards and will be paid for at the contract unit price per square yard based on the width of the widest course of this pavement type as designated. This price shall include performing all demolition, removing and disposing of pavement, base, subbase and stabilized subgrade materials. Demolition of a combination of hydraulic cement concrete pavement and asphalt concrete pavement and shoulder structure courses or a combination thereof will be measured as demolition of pavement (combination) in square yards and will be paid for at the contract unit price per square yard based on the width of the widest course of this pavement type as designated. This price shall include performing all demolition, removing and disposing of pavement, base, subbase and stabilized subgrade materials. Obscuring roadway will be measured in units of 1,000 square feet computed to the nearest 1/10 unit and will be paid for at the contract unit price per unit. The area measured will be entirely outside the construction limits of the new roadway, as evidenced by slope stakes. Areas disturbed by the operations, including tops of slopes to be rounded, will be included in the measurement. Removing pavement structures other than hydraulic cement–stabilized, hydraulic cement concrete, and asphalt concrete pavement structures in accordance with (b) 2. herein will be measured as regular excavation in accordance with Section 303 or as lump sum grading on minimum plan and no plan projects. Clearing and grubbing will be paid for in accordance with Section 301. Payment will be made under: ————————————————————————Pay Item Pay Unit————————————————————————Demolition of pavement (Type) Square yard Obscuring roadway Unit———————————————————————— 679509.04 SECTION 509—FLOW ABLE BACKFILL PLACEMENT
509.01 Description
This work shall consist of furnishing and placing flowable fill for use as backfill material in pipe instal - lations or in other uses at locations as designated on the plans or as designated by the Engineer, and as backfill material for plugging designated abandoned pipes and culverts.
509.02 Materials
Flowable backfill shall conform to Section 249.
509.03 Procedures
The Contractor shall mix and transport flowable backfill in accordance with Sections 217 and 249 or by other methods approved by the Engineer. Temperature of flowable backfill shall be at least 50 degrees F at the time of placement. The Contractor shall protect the material from freezing for 24 hours after placement. When used as backfill for pipe installation floatation or misalignment of the pipe may occur while the material is in its plastic state. The Contractor shall maintain correct alignment of the pipe by means of straps, soil anchors or other approved means of restraint. When flowable backfill is used to fill the voids in abandoned pipes and culverts, the pipes and culverts shall be plugged and then backfilled in accordance with the plan details, the VDOT Road and Bridge Standards, or as directed by the Engineer. The flowable backfill materials shall be installed in the aban - doned pipe or culvert in such a manner as not to create voids. When deemed necessary by the Engineer, the Contractor shall submit a plan of operations for the Engineer’ s acceptance showing how the flowable backfill will be placed without voids. The opening for culvert flowable backfill installation shall be sealed with Class A3 concrete conforming to Section 217 or masonry conforming to Sections 204, 218, and 222 as applicable at the completion of backfilling.
509.04 Measurement and Payment
Flowable Backfill will be measured in cubic yards and will be paid for at the contract unit price per cubic yard. When used as backfill material in pipe installations or in other uses at locations as designated on the plans or by the Engineer, this price shall include furnishing and placing flowable backfill, securing the pipe alignment, and for all materials, labor, tools, equipment and incidentals necessary to complete the work. When used as backfill material for plugging designated abandoned pipes and culverts, this price shall include furnishing and placing of backfill material and furnishing and installing plugs. Payment will be made under: ———————————————————————Pay Item Pay Unit———————————————————————Flowable Backfill Cubic yard———————————————————————
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 705–706 of 1,065.