585The price for the various types of riprap shall include, as appropriate, furnishing and placing riprap, including welded wire fabric or geotextile bedding material including overlaps when required, mortar or grout; excavation; and riprap bedding. The price shall also include preparing the surface, repair work, and excavating and backfilling toe-ins. Payment will be made under: ————————————————————————————— —Pay Item Pay Unit————————————————————————————— —Dry riprap (Class and depth) Square yard or ton Mortared riprap (Depth) Square yard Grouted riprap (Depth) Square yard or ton Stone riprap (Depth) Square yard or ton Dumped riprap (Type and depth) Square yard or ton Concrete riprap in bags Cubic yard Concrete slab riprap Square yard Erosion control riprap (Depth) Square yard or ton Erosion control stone (Class, Std) Square yard or ton—————————————————————————————— SECTION 415—CONCRETE SLOPE PROTECTION
415.01 Description
This work shall consist of furnishing and installing precast concrete blocks in a bed of coarse sand or installing a concrete slab on embankments at or near bridge abutments as shown on the plans or as specified by the Engineer.
415.02 Materials
a.Precast concrete blocks shall conform to Section 222.
b.Mortar shall be nonshrinking and shall conform to Section 218 as applicable.
c.Foundation course shall be Grading B sand conforming to Section 202 or approved local material similar in nature as approved by the Engineer.
d.Concrete shall be Class A3 conforming Section 217.
e.Welded wire fabric shall be No. 6 gage, 6 inches center to center each way, conforming to Section 223.
f.Herbicide shall conform to Section 244.
415.03 Procedures
a.Precast Concrete Block Slope Protection: The Contractor shall construct the subgrade at the required distance below the finished surface of the slope. Soft yielding sections and unsuitable 415.03 586material shall be removed and replaced with useable subgrade material. The subgrade shall be compacted and shaped to a smooth, uniform surface. The foundation course shall be spread on the subgrade to a depth of 2 inches and treated with a Department approved highly insoluble soil sterilent herbicide. Material shall be in a dry form and have a maximum solubility rate of 250 parts per million. Material shall be uniformly applied at the maximum rate recommended by the manufacturer. The Contractor shall bed the blocks in the foundation course perpendicular to the finished surface in straight rows, with the longest dimension aligned horizontally. Blocks shall be placed with continuous joints extending horizontally on the face of the slope and with broken (staggered) joints extending perpendicular thereto, up or down the slope. Blocks shall be rammed until firmly seated and the surface conforms to the finished slope. Joints shall be filled with mortar. Cast-in-place edging for block slope protection shall be placed as specified in (b) herein.
b.Concrete Slab Slope Protection: The subgrade shall be prepared as for block slope protection. The cast-in-place concrete slab shall be 4 inches in thickness and shall be placed in accordance with Section 414.03(i). Except at railroad grade separations, the Contractor may provide a combination concrete slab and stone slope protection in lieu of the specified concrete slab slope protection. Protection shall be in accordance with the following:
1.Concrete portions, consisting of a paved ditch and a strip of concrete approximately 3 feet in width placed on the berm along the face of the abutment, shall be furnished as required for concrete slab slope protection. Stone shall be placed at a depth of 7 to 9 inches over the remaining area to be covered with slope protection.
2.The Contractor shall prepare the subgrade for concrete and stone in accordance with Section 414.03(i). The portion of the slope to be protected with stone shall be treated with a herbicide in accordance with (a) herein. Care shall be taken to confine application to areas designated for sterilization.
3.Stone shall be crushed gravel or stone conforming to Section 204.02 (b). Gradation of aggregate shall not be smaller than the sizes specified in Table II-3 for aggregate size No. 1 nor larger than 8 inches in their greatest dimension. Stone shall be in a sufficient range of sizes to create a stable (choked and locked) and reasonably uniform slope. The condition of the subgrade and method of placing stone shall be such that pieces of stone in contact with the subgrade shall be partially embedded where practicable. Stone immediately adjacent to concrete shall not project more than 3 inches above the concrete. Engineer approved splash blocks connecting with the paved ditch shall be provided under downspouts draining onto the slope protection.
415.04 Measurement and Payment
Concrete slope protection will be measured in square yards of surface area and will be paid for at the contract unit price per square yard. If limits are not shown on the plans, measurements will be taken from 415.03 587the outside edge to outside edge, including curb, and from the edge of slope protection at abutment to the bottom of the curtain wall or outside edge of the paved ditch as appropriate. This price shall include the slope protection, foundation course, welded wire fabric, herbicide treatment and splash blocks. Payment will be made under: ————————————————————————————Pay Item Pay Unit————————————————————————————Concrete block slope protection Square yard Concrete slab slope protection (Depth) Square yard———————————————————————————— SECTION 416—W ATERPROOFING
416.01 Description
This work shall consist of furnishing and applying waterproofing material on concrete bridge decks or other surfaces as shown on the plans.
416.02 Materials
Epoxy-resin compounds and aggregates for surface application shall conform to Section 243. Epoxy resin shall be Type EP-5, low viscosity, or Type EP-7 for concrete bridge deck applications and Type EP-3B/EP-3T for other bridge elements such as concrete beam ends and concrete substructure seat applications. Epoxy Type EP-3B shall be dark grey in color, unless otherwise specified on the Plans or elsewhere in the Contract.
416.03 Procedures
Epoxy-resin: Containers, tools, and mechanical equipment shall be free from solvents, loose material, and deposits of hardened material. The Contractor shall not apply epoxy resin when the concrete surface or the ambient air temperature is below 50 degrees F unless otherwise permitted by the manufacturer’ s instructions.
a.Surface preparation: Surfaces on which epoxy compounds are to be applied shall be free from grease, dirt, dust, paint, mill scale, curing compound, laitance, and other foreign material which may prove deleterious to bonding. Concrete surfaces on which epoxy compounds are to be used shall be abrasive blast cleaned suf - ficiently to expose the sound concrete. Surfaces that are not to receive epoxy compounds shall be protected from abrasive blast cleaning. Immediately following abrasive blast cleaning, the surface shall be thoroughly cleaned according to the epoxy resin manufacturer’ s instructions. Before epoxy compounds are applied to metal surfaces, surfaces shall be abrasive blast cleaned to a bright metallic luster according to Method 5 of Section 411. Wood surfaces shall be abrasive blast cleaned as needed to obtain proper adhesion of the epoxy.416.03
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 613–614 of 1,065.