A06 40512685 Specifications.doc

TECHNICAL

SPECIFICATIONS

AFTERBAY RIVER BOAT LAUNCH RAMP EXTENSION

BIGHORN CANYON NATIONAL RECREATION AREA

SOLICITATION #140P1421R0001

INDEX TO

TECHNICAL SPECIFICATIONS

AFTERBAY BOAT RAMP EXTENSION

DIVISION 2

SITE WORK

Section 02207 - Aggregate Material

DIVISION 3

CONCRETE

Section 03100 - Concrete Form Work

Section 03200 - Concrete Reinforcement

Section 03310 – Structural Concrete Section 03311 – Push-in-Slab Concrete Boat Ramp

SECTION 02207

AGGREGATE MATERIALS

PART 1

GENERAL

A. This work shall consist of the installation of the Class I rip-rap around the push-in concrete boat ramp.

1.1

RELATED SECTIONS

A. Section 02211 ‑ Rough Grading.

1.2

REFERENCES

A.

AASHTO ‑ M147 ‑ Materials for Aggregate and Soil‑Aggregate.

1.3

SUBMITTALS

A.

The Contractor shall designate in writing the source from which they intend to obtain the rip rap at least 15 days prior to installation, for Project Manager approval.

B.

Materials Source: Submit name of imported materials suppliers. Provide materials from same source throughout the work. Change of source requires Project Manager approval.

PART 2

PRODUCTS

2.1

AGGREGATE MATERIALS

Rip Rap Rock: Furnish hard, durable, and angular in shape rock that is resistant to weathering and water action and free from overburden, spoil, shale, structural defects, organic or other unsuitable material. Do not use rounded stone or boulders from a streambed source as riprap. Angular faces of stone shall inter-lock to provide a stable surface. The stone will be accepted based on visual analysis, a laboratory report, or both. Submit samples before shipping the riprap to the site.

PERCENTAGE OF GRADATIONS – ROCK RIP RAP

Weight of Stone

Equivalent Spherical Diameter

% of total weight that must be smaller than given size

100 pounds

1.05 ft

60 pounds

0.88 ft

70-90

25 pounds

0.66 ft

40-60

2 pounds

0.27 ft

0-10

PART 3 EXECUTION

3.1

SUBSURFACE PREPARATION

The subgrade surfaces on which the riprap or bedding course is to be placed shall be cut or filled and graded to the lines and grades shown on the drawings. When fill to subgrade lines is required, it shall consist of approved materials and shall conform to the requirements of the specified class of fill.

Riprap shall not be placed until the foundation preparation is completed and the subgrade surfaces have been inspected and approved by the Owner or Owner’s Representative.

3.2

EQUIPMENT – PLACED ROCK RIPRAP

The rock shall be placed by equipment on the surfaces and to the depths specified. The riprap shall be constructed to the full course thickness in one operation and in such a manner as to avoid serious displacement of the underlying materials. The rock shall be delivered and placed in a manner that will ensure that the riprap in place shall be reasonably homogeneous with the larger rocks uniformly distributed and firmly in contact one to another with the smaller rocks and spalls filling the voids between the larger rocks.

Riprap shall be placed in a manner to prevent damage to structures. Hand placing will be required to the extent necessary to prevent damage to the permanent works.

3.3

HAND – PLACED RIPRAP

The rock shall be placed by hand on the surfaces and to the depths specified. It shall be securely bedded with the larger rocks firmly in contact one to another. Spaces between the larger rocks shall be filled with smaller rocks and spalls. Smaller rocks shall not be grouped as a substitute for larger rock. Flat slab rock shall be laid on edge.

END OF SECTION

SECTION 03100

CONCRETE FORMWORK

GENERAL

1.1

SECTION INCLUDES

A.

Formwork for push‑in concrete, with shoring, bracing and anchorage.

B.

Form accessories.

C.

Form stripping.

1.2

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

A.

Section 03311 – Push-in-Slab Concrete: Supply of concrete accessories for placement by this section.

1.3

RELATED SECTIONS

A.

Section 03200 ‑ Concrete Reinforcement.

B.

Section 03311 – Push-in-Slab Concrete.

1.4

REFERENCES

A.

ACI 301 ‑ Structural Concrete for Buildings.

B.

ACI 318 ‑ Building Code Requirements for Reinforced Concrete.

C.

ACI 347 ‑ Recommended Practice for Concrete Formwork.

D.

PS 1 ‑ Construction and Industrial Plywood.

1.5

DESIGN REQUIREMENTS

A.

Construct formwork, shoring and bracing to conform to design and code requirements; resultant concrete to conform to required shape, line and dimension.

1.6

REGULATORY REQUIREMENTS

A. Conform to applicable code for fabrication, erection and removal of formwork.

PART 2

PRODUCTS

2.1

WOOD FORM MATERIALS

A.

Form Materials: At the discretion of the Contractor.

2.2

FORMWORK ACCESSORIES

A.

Form Release Agent: Colorless mineral oil which will not stain concrete or absorb moisture.

B.

Nails, Spikes, Lag Bolts, Through Bolts, Anchorages: Sized as required, of sufficient strength and character to maintain formwork in place while placing concrete.

PART 3

EXECUTION

3.1

EXAMINATION

A.

Verify lines, levels and centers before proceeding with formwork. Ensure that dimensions agree with drawings.

3.2

EARTH FORMS

A.

Earth forms are not permitted.

3.3

ERECTION ‑ FORMWORK

A.

Erect formwork, shoring and bracing to achieve design requirements, in accordance with requirements of ACI 301.

B.

Provide bracing to ensure stability of formwork. Shore or strengthen formwork subject to over stressing by construction loads.

C.

Arrange and assemble formwork to permit dismantling and stripping. Do not damage concrete during stripping.

D.

Align joints and make watertight. Keep form joints to a minimum.

3.4

APPLICATION ‑ FORM RELEASE AGENT

A.

Apply form release agent on formwork in accordance with manufacturer's recommendations.

B.

Apply prior to placement of reinforcing steel, anchoring devices, and embedded items.

C.

Soak inside surfaces of untreated forms with clean water. Keep surfaces coated with form release agent prior to placement of concrete.

3.5

FORMWORK TOLERANCES

A.

Construct formwork to maintain tolerances required by Section 03311 – Push-in-Slab Concrete.

3.4

FIELD QUALITY CONTROL

A.

Inspect erected formwork, shoring, and bracing to ensure that work is in accordance with design, and that supports, fastenings, wedges, ties, and items are secure.

B.

Notify Engineer 72 hours prior to concrete placement for inspection of formwork and rebar reinforcement installation.

3.5

FORM REMOVAL

A.

Do not remove forms or bracing until concrete has gained sufficient strength to carry its own weight and imposed loads.

B.

Loosen forms carefully. Do not wedge pry bars, hammers, or tools against finish concrete surfaces scheduled for exposure to view.

SECTION 03200

CONCRETE REINFORCEMENT

GENERAL

1.1

SECTION INCLUDES

A.

Reinforcing steel, fiber mesh and accessories for cast‑in‑place concrete.

1.2

RELATED SECTIONS

A.

Section 03100 ‑ Concrete Formwork.

B.

Section 03311 – Push-in-Slab Concrete.

1.3

REFERENCES

A.

CRSI ‑ Concrete Reinforcing Steel Institute ‑ Manual of Practice.

B.

CRSI 63 ‑ Recommended Practice For Placing Reinforcing Bars.

C.

CRSI 65 ‑ Recommended Practice For Placing Bar Supports, Specifications and Nomenclature.

1.4

QUALITY ASSURANCE

A.

Perform Work in accordance with CRSI 63, 65 and Manual of Practice.

1.5

COORDINATION

A.

Coordinate work under provisions of Section 01039.

PART 2

PRODUCTS

2.1

REINFORCEMENT

A.

Reinforcing Steel: ASTM A 615 or ASTM A 617/A 617M, Grade 40. Place as shown on the plans.

2.2

ACCESSORY MATERIALS

A.

Tie Wire: Minimum 16 gage annealed type.

2.3

FABRICATION

A.

Fabricate concrete reinforcing in accordance with CRSI Manual of Practice.

B.

Locate reinforcing splices not indicated on drawings, at point of minimum stress, according to ACI 301. Review location of splices with Engineer.

PART 3

EXECUTION

3.1

PLACEMENT

A.

Place, support and secure reinforcement against displacement. Do not deviate from required position.

B.

Maintain concrete cover around reinforcing as follows:

C.

Item

Coverage

Footings and Concrete Formed

Against Earth

3 inches

Concrete not Formed Against Earth

2 inches

3.2

FIELD QUALITY CONTROL

A.

Field inspection shall be performed by the Engineer.

B.

Notify Engineer 72 hours prior to placement of concrete inform for form work and rebar inspection.

SECTION 03310

STRUCTURAL CONCRETE

PART 1

GENERAL

1.1

DESCRIPTION

A. OWNER will provide a grooving tool(s) for producing a grooved finish on the concrete surface. The tool(s) provided shall be returned cleaned. The finishing tool surfaces shall be free of hardened concrete and in good condition. A cleaning cost of $250.00 will be retained if the tool(s) are returned not cleaned or poorly cleaned. Additional costs for repair or replacement of damaged tools may also be retained.

PART 2

PRODUCT

2.1

CLASSIFICATION

1. Use M-4000 concrete for all concrete.

PART 3

EXECUTION

3.4

PLACING CONCRETE

A.

Provide written and/or verbal communication notice to the Project Manager three (3) working days, excluding Saturday and Sunday, prior to any project concrete pour, regardless of pour quantity. For clarification, all written communication notices have to be received per this requirement.

3.4A

CONCRETE V-GROOVE FINISHING

A. Required Accuracy

1. The Contractor shall construct all specified work as shown on the project drawings within the specified tolerances, shown in Table 1. The following are reasonable tolerances that allow for a maximum specified deviation which may occur in the field during construction. Deviations beyond any values listed below may result in reduction in payment, or rejection, in part due to poor aesthetics, loss of functionality, or does not meet desired design criteria.

2. If the Contractor fails to meet specified tolerances, that portion of the work area, as specified below, may be reduced in payment or rejected, removed and replaced in accordance with General Conditions.

Table 1. V-Groove Finish Tolerances

B. Concrete V-Groove Finish

1. Provide a v-groove finish on all ramp surfaces as shown in the project drawings or directed by the Project Representative. Provide adequate laborers to begin concrete v-groove finish during concrete placement. Timing of v-grooving finish is critical.

2. Factors that may influence the v-groove finish and concrete performance include air content, water content, add-mixtures and strength. Some Contractors delay starting the finish or may have a tendency to add water to the concrete surface, in order to achieve a “perfect” ramp finish. This must be avoided, as significant amounts of water in the surface layer will result in weak strength of the v-grooves, which at best contain less quantity of large aggregate due to the nature of the finish process. Refer to the Technical Specifications for other influential factors including, but not limited to, mix design, mixing and placement time, weather, correct placement of rebar, and correct thickness of ramp.

C. V-Groove Rating Score

1. The following rating score shall be used to determine allowable tolerances for all v-groove concrete finishes. The Project Representative shall make the final determination on any deficient or unacceptable area, determine the rating score, and conduct measurements as deemed necessary for evaluation. Three (3) v-grooving evaluation criteria will be considered in determining the rating score including: appearance; angle orientation; and depth. A criteria rating score will be assigned for each based on the V-Groove Rating System, shown in Table 2. An overall, or final, rating score is made by averaging the three criteria rating scores. Final rating scores will be rounded to the nearest whole number.

Rating Score

Unacceptable, Contractor shall replace that portion of the ramp.

Poor, Reduction of 50% in payment for that portion of the ramp, or Contractor shall replace that portion of the ramp.

Fair, Minimum acceptance range.

Good.

Excellent, Letter of commendation to Contractor.

Table 2. V-Groove Evaluation Rating System

Sharp, Crisp, Clean, Smooth

25-35 degrees

0.61” to 0.75”

3.4

TESTING

A. Compression Tests

Mold a minimum of three (3) field cure cylinders (6-inch diameter), for each day of concrete placement. Follow requirements for field curing and strength testing found in the Montana Public Works Standard Specifications (MPWSS) Sixth Edition, April 2010.

END OF SECTION 03310

SECTION 03311

PUSH-IN-SLAB CONCRETE BOAT RAMP

PART 1

GENERAL

1.1

DESCRIPTION

A.

This work consists of furnishing and installing a submerged concrete push-in-slab boat ramp surface.

PART 2

PRODUCTS

2.1

GENERAL

A. Refer to Section 03310 for structural concrete materials and ramp surface finish.

B. Refer to Section 03210 for reinforcing steel materials.

C. Rail System

1. Furnish new material consisting of W6x20 steel beams or approved equal to support push-in slab during installation.

PART 3

EXECUTION

3.1

INSTALLATION

A. Casting

1. Push-in-slab shall be placed on approximately a matching grade to that of the final grade of the existing ramp. Imported embankment material may be necessary to construct the push-in slab at the matching ramp grade, as well as provide a cushion for mechanical pushing equipment.

2. Push-in-slabs shall be placed on a layer of compacted aggregate (6 inch minimum thickness) and shall be allowed to cure for a minimum of 14 days prior to movement. Provide a smooth surface to reduce friction forces during push-in slab movement (i.e. plastic sheeting).

3. Push-in-slabs shall be built to a size that can be handled by the Contractor’s equipment, preferably one slab per site. Each slab shall be constructed to a length that can be controlled and placed in the desired position. Contractor to provide size, type, and number of equipment with operators to push slab into final position.

4. Remove all imported embankment from the ramp surface after the push-in slab is in place. Cleanliness of the ramp surface must be approved by the Project Representative, prior to final acceptance.

B. Rail System

1. Rails shall be placed at the grade specified in the plans. Space steel beams longitudinally as shown on the project drawings. Beams shall have adequate cross braces to ensure beams remain parallel as slab is pushed over beams.

2. Six inches (6”) of clean, screened crushed ¾” gravel leveling course shall be placed around the railing system and screeded to top of rail system prior to push-in slab installation.

END OF SECTION 03311