DESCRIPTION
610.01.01 General. This work consists of furnishing and placing riprap (with or without grout), riprap bedding,
and geotextile. MATERIALS
610.02.01 General . Material shall conform to the following Sections and Subsections:
Portland Cement ................................ .................................................................................................................................... Section 701 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Stone for Riprap ...................................................................................................................................................... Subsection 719.03.01 Aggregate for Riprap Bedding ................................ ................................ ................................................................. Subsection 719.03.02 Water ..................................................................................................................................................................................... Section 722 Engineering Fabrics ................................ ............................................................................................................................... Section 731 Compose grout of 1 part Portland cement and 3 parts grout aggregate by volume. CONSTRUCTION
610.03.01 Earthwork. Make surfaces to be protected by riprap free of brush, stumps and other objectionable
materials and dress to a smooth surface. Remove any soft or spongy material as directed and replace with approved native material. Compact filled areas as specified for embankments in Section 203. Excavations for riprap beds shall conform to Sections 203 and 206. Exca vations for trenches, footings, cutoff walls, etc., shall conform to Section 206. Gradation and compaction requirements on backfill will not apply. When shown on the plans, place a bedding layer or filter on the prepared surface as specified before the ri prap is placed.
610.03.02 Riprap. Place stone for riprap on the prepared surface by hand or mechanical means in a manner
which will produce a well graded mass of stone with a minimum practicable percentage of voids. Place the stone so as to be in close co nformity with the details shown on the plans. Place riprap to its full course thickness in one operation and in such a manner as to avoid displacement of the underlying material. Do not place riprap in layers, or by dumping into chutes, or by similar met hods likely to cause segregation. Produce a fairly compact riprap course in which all sizes of material are evenly distributed and placed in their proper proportions. Hand placement or rearrangement of individual stones by mechanical equipment may be required to secure the results specified. Replace any material displaced by any cause to the lines and grades shown on the plans.
610.03.03 Grouted Riprap. This stone shall conform to the requirements of Subsection 719.03.01 except that
gradation and grout penetration depth requirements shall be as specified in the Special Provisions. Place stone by hand or mechanical means that will produce a well graded, uniform rock blanket in close conformity with the details shown on th e plans. The finished face shall present an even, tight surface. The rock to be grouted shall be basically free of fines in order that penetration of the grout can be achieved. Wet the rock immediately prior to commencement of the grouting operation. Fill the space between the stones with grout to the depth specified. Use sufficient grout of a consistency to completely fill all voids, except leave face stones exposed to 1/4 to 1/3 their depth. Transport the grout to the place of final deposit by use of c hutes, tubes, buckets, pneumatic equipment, or any other mechanical method which will control segregation and uniformity of the grout. Use spading and rodding where penetration is achieved by gravity flow into the interstices. Cure the grouted surface as specified in Subsection 501.03.08 for a period of at least 3 days. 610 RIPRAP
610.03.04 Riprap Bedding. Uniformly place the riprap bedding material on the prepared surface by hand or
mechanical means in a manner which will produce a well graded mass of material with the minimum practicable percentage of voids. Place the bedding so as to be in close conformity with the details shown on the plans. Place riprap bedding to its full course thickness in one operation and in such a manner as to avoid displacement of the underlying material. Do not place riprap bedding in layers, or by dumping into chutes, or by similar methods likely to cause segregation. Produce a fairly compact riprap bedding layer in which all sizes of material are evenly distributed and placed in their proper proportions. Replace any material displaced by any cause to the lines and grades shown on the plans.
610.03.05 G eotextile. Grade the area to receive the geotextile to an even, smooth surface that is free of
cavities, large stones, or other debris capable of puncturing or tearing the geotextile. Use equipment for installation that is recommended by the manufacturer and approved. Unroll and place the geotextile parallel to the direction of water flow. Place the geotextile in intimate contact with the soil without wrinkles or folds. Use care to ensure that the geotextile is not damaged by the installation procedures. Avoid smearing the geotextile with mud or contaminating it with other foreign substances. Place the geotextile so that backfilling operations do not tear or excessively stretch the fabric. Join adjacent sheets and roll ends together by overlapping or sewing. If adjacent sheets and roll ends are overlapped, overlap upslope sheets over downslope sheets and upstream sheets over downstream sheets. Overlap roll ends and adjacent sheets a minimum of 0.3 m (1 ft) unless placed underwater or on slopes steeper than 2:1 (H:V). I ncrease roll ends and adjacent sheet overlaps to a minimum of 1 m (3 ft) when the geotextile is installed underwater or on slopes steeper than 2:1 (H:V). Maintain a minimum offset of 1.5 m ( 5 ft) between adjacent overlapped or sewn roll ends. Do not pin or staple geotextile sheets together to maintain overlaps during construction on slopes steeper than 2:1 (H:V). If adjacent sheets and roll ends are sewn, use a polypropylene or polyester thread with a color contrasting to the geotextile. Submit a seam asse mbly description including seam type, stitch type, sewing thread, and stitch density along with seam samples. Provide a certificate of compliance to verify that the seam strength meets a minimum of 90% of the required grab strength of the geotextile. Limit atmospheric exposure of the uncovered geotextile to 10 days to minimize damage potential due to sunlight, rain, dirt, and contamination. Before covering, the geotextile will be inspected to determine that there are no holes, tears, folds, wrinkles, or contaminated areas. Repair holes or tears by placing a new layer of geotextile extending beyond the defect at least 0.3 m (1 ft) in all directions. Remove and replace contaminated areas with new geotextile. Place the geotextile and backfill materials on t he same day during underwater installations. Do not drive vehicles or construction equipment directly on the geotextile. Place a minimum thickness of 200 m (8 in.) of riprap bedding on top of the geotextile before operating vehicles or construction equipment over the geotextile. Do not turn construction vehicles on the first backfill lift placed on top of the geotextile. Place riprap bedding by dumping from the edge of the geotextile or from previously placed lifts of riprap bedding. Do not drop riprap bedding or riprap from a distance higher than 1 m ( 3 ft) above the geotextile. Place riprap stones 450 mm ( 18 in.) in diameter or larger without free fall. On slopes, place riprap and riprap bedding from the toe and proceed up the slope. Perform field monitoring to ensure that the armor system placement procedures do not damage the geotextile. When directed, r emove riprap and riprap bedding at any location to allow for inspect ion of the geotextile for damage. Reinstall bedding and riprap at inspected areas. Submit proposed installation procedures for underwater applications for approval a minimum of 14 days prior to construction. Include specific details addressing how geotextile damage inspection and minimum geotextile overlap requirements will be satisfied. Conduct field trials to demonstrate that any proposed alternate construction procedures are suitable for revetment construction prior to approval. Any damage to t he geotextile inflicted during field trials shall be mitigated by repairing or replacing as described above. RIPRAP 610 METHOD OF MEASUREMENT
610.04.01 Measurement. Riprap , grouted riprap, and riprap bedding will be measured by the cubic meter
(cubic yard). Excavations for riprap beds will be measured and paid for according to Sections 203 and 206. Structure excavation for riprap trenches, footings, cutoff walls, etc., will be measured and paid for according to Section 206. Backfill shall be considered as inc luded in the price paid for structure excavation and no separate payment will be made therefore. Geotextile will be measured by the square meter (square yard). No allowance will be made for material overlap. BASIS OF PAYMENT
610.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment wi ll be made under: Pay Item Pay Unit Riprap (class) .................................................................................................................................................... Cubic Meter (Cubic Yard) Grouted Riprap ................................................................................................................................................. Cubic Meter (Cubic Yard) Riprap Bedding (class) ...................................................................................................................................... Cubic Meter (Cubic Yard) Geotextile (class) ................................ ................................ ......................................................................... Square Meter (Square Yard) SECTION 611 C ONCRETE SLOPE PAVING DE SCRIPTION 611.
01.01 General. This work consists of constructing concrete slope paving.
M ATERIALS 611.
02.01 General. Material shall conform to the following Section and Subsection:
Portland Cement Concrete ..................................................................................................................................................... Section 501 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 C oncrete shall be Class A or Class AA concrete as shown in the proposal. Class D may be substituted for Class A concrete or Class DA may be substituted for Class AA concrete. I n addition to the requirements of S ection 501, include the proposed fibers to be used in the trial batches for mix design approval except as follows: F or concrete slope paving quantities of 30 m3 (40 yd3) or less, the addition of fibers in the trial batches for mix desig n approval is waived. F ollow the manufacturer’s recommendation for the addition of Type I and Type II fibers. For Type III synthetic or polypropylene fibers, add at a rate of 0.89 kg/m3 (1.5 lb/yd3) of concrete. H eader boards consisting of 38 mm by 89 mm (Standard 2 x 4) redwood lumber shall be commercial grade heart redwood, S4S. N ails used in construction of header boards shall be commercial quality galvanized nails. 611.
02.02 Fibrous Concrete Reinforcement. (a) Fiber Types. The fiber reinforcement shall conform to the
classifications of Type I Steel Fiber, Type II Glass Fiber, or Type III Synthetic Fiber as described in ASTM C1116. S elect steel fibers, glass fibers, or synthetic fibers with physical and chemical properties recommended in ACI 544.1R. (
b.Certificates. Ascertain that all required tests have been made by approved testing laboratories. F urnish a written certification that all required tests have been satisfactorily completed and that the materials and fabrication thereof comply with all the requirements. CO NSTRUCTION 611.
03.01 Earthwork. Form the subgrade for paved ditches and slope paving by excavating to the required
depth below the prepared finish surface grade. C ompact the subgrade to not less than 95% of the maximum density as determined by Test Method No. Nev. T108. The in- place density will be determined by Test Method No. Nev. T102 or T103. R emove any soft, spongy, or other unsuitable material to such depth as directed and backfill with suitable material and compact. Sp rinkle water on the subgrade during compaction. S ufficiently moisten the subgrade before placing concrete to prevent absorption. E xcavations for slope paving, trenches, footings, cutoff walls, etc., shall conform to Sections 203 and 206. Gradation and compaction requirements on backfill will not apply.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 343–346 of 610.