Spec Update - 02 24 50 - 28 July 2022 .pdf

Fort George Bank Stabilization 2022 - Big Bend Dam, SD BB00100

SECTION TABLE OF CONTENTS

DIVISION 02 - EXISTING CONDITIONS

SECTION 02 24 50

STONE (RIPRAP) PROTECTION

04/00

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 UNIT PRICE

1.3.1 Measurement for Payment

1.3.2 Basis for Payment

1.4 GENERAL

1.5 WAYBILLS AND DELIVERY TICKETS

1.6 SAMPLING AND TESTING

1.6.1 General Requirements

1.6.2 Test Results

1.6.3 Initial Sampling and Testing

1.6.3.1 Bulk Specific Gravity

1.6.3.2 Soundness in Magnesium Sulfate

1.6.3.3 Soundness in Freezing and Thawing

1.6.3.4 Immersion

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 General Requirements

2.1.2 Riprap

2.1.3 Stone Weight Limitations

PART 3 EXECUTION

3.1 GENERAL

3.2 PLACEMENT

3.2.1 Riprap

3.2.2 Tie Backs

3.2.3 PROTECTION

3.2.4 SITE PROTECTION REQUIREMENTS

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SECTION 02 24 50

STONE (RIPRAP) PROTECTION

04/00

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO T 103 (1991) Soundness of Aggregates by Freezing and Thawing

South Dakota Department of Transportation

2015 SDDOT (2015) Standard Specifications for Roads and Bridges

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Stone Weight Limitations; G-PO

Reference paragraph 2.1.3 for riprap gradation requirements.

SD-06 Test Reports; G-PO

Initial Sampling and Testing; G-PO

Reference paragraph 1.6.3 for testing requirements.

SD-11 Closeout Submittals; G-PO

Waybills and Delivery Tickets; G-PO;

1.3 UNIT PRICE

1.3.1 Measurement for Payment

Reference section 01 22 00.00 10, MEASUREMENT & PAYMENT.

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1.3.2 Basis for Payment

Per ton to nearest 20 lbs or 0.01 ton.

1.4 GENERAL

The work specified herein consists of placement of stone protection as shown on the drawings and as directed by the Contracting Officer's Representative. The Contractor shall control operations during production of stone protection material so as to insure that the material delivered and placed will meet all specification requirements. The quarry operators shall be responsible for operating all quarries and for conditioning the area after operations are complete, in accordance with all applicable Federal, State, and local laws and regulations.

1.5 WAYBILLS AND DELIVERY TICKETS

Copies of waybills or delivery tickets shall be submitted during the progress of the work. Before the final payment is allowed, waybills and certified delivery tickets shall be furnished for all stone protection materials actually used in the construction.

1.6 SAMPLING AND TESTING

1.6.1 General Requirements

The Contractor shall be responsible for all sampling and testing specified herein. The Government may perform verification tests as determined necessary for final approval of the stone protection material. All samples including samples taken during production shall be representative of the stone protection material furnished or proposed to be furnished.

Samples shall be taken in accordance with ASTM D 75 or other approved method. All sampling operations shall take place in the presence of a representative of the Contracting Officer's Representative. No rock shall be furnished from any ledge which has not been sampled, tested, and approved for use on this project.

1.6.2 Test Results

Results shall verify that materials comply with this specification. When a material source is changed, the new material will be tested for compliance. When deficiencies are found, the initial analysis shall be repeated and the material already placed shall be retested to determine the extent of unacceptable material. All in-place unacceptable material shall be replaced or modified as directed by the Contracting Officer's Representative.

1.6.3 Initial Sampling and Testing

Tests for bulk specific gravity shall be performed on samples of material obtained from each ledge proposed for use as stone protection prior to start of construction. Test results shall describe type of failure of the discrete particles. Certified test results performed not longer than 12 months prior to delivery to the project together with the name of the owner of the quarry and the legal description shall be submitted to the Contracting Officer's Representative.

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1.6.3.1 Bulk Specific Gravity

Bulk specific gravity shall be computed in accordance with ASTM C 127/ASTM C 128 except that the total sample shall weigh 5000 grams +/-2 percent and individual particles shall weigh approximately 300 grams each. Stone protection material shall be tested in a saturated surface-dry (SSD) condition. The computed bulk specific gravity so determined shall not be less than 2.55.

1.6.3.2 Soundness in Magnesium Sulfate

Soundness in magnesium sulfate shall be determined according to ASTM C 88 with test modifications as listed below. The combined loss at 5 cycles shall be not more than 8 percent. The test report shall show the percentages of loss calculated as described herein and the number of pieces affected, classified as to number disintegrating, splitting, crumbling, cracking, flaking, etc.

a. Sample Preparation

The sample shall be prepared by breaking it into fragments reasonably uniform in size and shape and weighing approximately 100 grams each. The test sample shall weigh 5000 grams +/-2 percent. The sample shall be thoroughly washed and dried previous to test as described for coarse aggregate.

b. Sample Immersion and Temperature

The sample immersed in the solution shall be maintained at a temperature of 80 degrees F +/- 2 degrees F for the immersion period.

c. Quantitative Examination

At the end of the fifth cycle, the percentage loss shall be determined by the three following methods. The test report shall show the loss computed by each method; however, only the combined loss shall be used for acceptance or rejection of the material.

d. Loss By Breaking

An individual piece which has broken or split into three or more fragments shall be considered to have failed the test, provided each of the three such fragments is at least 10 percent of the original piece by weight.

The total original weight of all pieces failing the test, expressed as percentage of the total original weight of the sample, shall be considered as percentage loss by breaking.

e. Loss By Crumbling and Flaking

After the loss by breaking has been determined, the pieces that have not failed in that determination shall be screened on the 1/2-inch sieve and the material retained on the sieve shall be weighed for purposes required to determine combined losses. The pieces which have failed by breaking shall then be added to the material remaining on the 1/2-inch sieve and screened. The difference between the total original weight of the sample and the total weight of the material retained on the 12.5 mm sieve expressed as percentage of the total original weight, shall be considered as percentage loss by crumbling and flaking.

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f. Combined Loss

The difference between the total original weight of the sample and the weight of the material retained on the 1/2-inch sieve, after screening the pieces which did not fail by breaking, expressed as percentage of the total original weight, shall be considered as percentage combined loss.

1.6.3.3 Soundness in Freezing and Thawing

The test for freezing and thawing shall consist of AASHTO T 103 , Ledge Rock Method, Procedure C, modified as indicated below. The loss at 12 cycles shall not exceed 5.0 percent. The test report shall shall describe the type of failure of the discrete particles.

a. Temperature

The temperature of the surrounding medium during freezing shall be maintained in the range of -20 to -10 degrees F.

b. Freeze/Thaw Cycle

The length of a freezing and thawing cycle shall be sufficient to totally freeze and totally thaw each piece of the sample during each cycle. The laboratory shall specifically determine for each sample that the cycle used is sufficient to accomplish total freezing and total thawing and shall report this in the test report. However, in no case shall the cycle consist of less than 2-1/2 hours of freezing followed by 1 hour of thawing. The sample shall be held in the frozen condition whenever necessary to break the cycle (overnight, weekends, etc.).

1.6.3.4 Immersion

Procedure C, Partial Immersion shall be used, except that soaking prior to testing shall be in accordance with Procedure A.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 General Requirements

All stone for stone protection shall be durable field stone or quarried rock as approved by the Contracting Officer's Representative. Field boulders shall be fractured on a minimum of three (3) sides. Individual pieces of stone protection in-place shall be free from cracks, seams, and other defects that will cause rapid or excessive deterioration or degradation during service. The bulk stone protection material delivered to the project shall be of such quality that tests performed on representative samples have results within the limits specified. The stone protection shall contain not more than 5 percent of undesirable material by weight. Undesirable material is defined as individual pieces of stone which do not meet the quality requirements when tested as specified herein and which can be visually differentiated from the satisfactory pieces, plus dirt, sand, clay, and rock fines. Stone protection material shall not contain disintegrated granite or shale. The Contractor shall select the source or sources he proposes to use and perform the initial sampling and testing of the materials well in advance of the time when the material will be required in the work.

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2.1.2 Riprap

The riprap shall consist of stone meeting the requirements specified herein and shall be in pieces approximately rectangular in cross section, free from thin slabby pieces having a maximum dimension more than four times the least dimension. Stone for riprap shall be reasonably well graded from coarse to fine. Dirt and fines of less than 1/2-inch maximum cross section, accumulated from interledge layers or from blasting or handling operations shall not exceed 5 percent by weight.

2.1.3 Stone Weight Limitations

The riprap shall be reasonably well-graded and conform to the gradation requirements of South Dakota Class "C" riprap per Section 830 of the South Dakota DOT Standard Specifications for Roads and Bridges ( 2015 SDDOT).

Gradation limits are shown below.

Rock Size in Feet** Rock Size in Pounds Percent of Riprap Smaller

Than

2.25 1000 100

1.80 500 50

0.95 75 15

PART 3 EXECUTION

3.1 GENERAL

Quarry operations shall be controlled to produce a reasonably well-graded stone of required size, and the Contracting Officer may require changes as necessary to produce the required product. The Contractor's operations shall be conducted in a manner that will produce stone meeting the requirements specified and shall include selective quarrying, handling, and loading as required.

3.2 PLACEMENT

3.2.1 Riprap

Riprap stone shall be placed in such manner as to produce a reasonably well-graded mass of rock with the minimum practicable percentage of voids. Riprap shall be placed to its full course thickness in one operation and in such manner as to avoid damage to the geotextile material and to minimize segregation of riprap. The larger stones shall be well distributed and the entire mass of stones in their final position shall be roughly graded to conform to the gradation specified. The finished riprap shall be free from objectionable pockets of small stones and clusters of larger stones. Placing riprap in layers will not be permitted. The desired distribution of the various sizes of stones throughout the mass shall be obtained by selective loading of the material at the quarry or other source; by controlled dumping of successive loads during final placement. Zero drop height placement procedures are to be utilized for stone to avoid displacing or damaging the underlying geotextile. Dumping of stone at the top of slopes and rolling or pushing into place will not

SECTION 02 24 50 Page 6 be permitted. Manipulating or moving stone at any time prior to placement by means of dozers or other blade equipment will not be permitted.

Rearranging of individual stones by mechanical equipment or by hand will be required to the extent necessary to obtain a reasonably well graded distribution of stone sizes as specified above. Underwater placement of rock may be required. The rock shall be placed underwater to these placement specifications as much as practicable. The method of underwater placement shall be approved by the Contracting Officer.

3.2.2 Tie Backs

Rip rap section shall be tied back into the existing cut bank. A trench is to be excavated a minimum of 20 feet into the virgin material. The bottom of the excavation shall match the same elevation as the adjacent section.

Placement and length of the tie back shall be at the discretion of the contracting officers representative on site. The tie backs shall be located at the furthest upstream and downstream stations of the protected shoreline.

3.2.3 PROTECTION

The Contractor shall maintain the riprap stone until accepted and any material displaced by any cause shall be replaced at the Contractor's expense to the lines and grades shown on the drawings.

3.2.4 SITE PROTECTION REQUIREMENTS

Due to the cultural sensitivity of the site, care must be taken to eliminate surface damage from turning machinery, rutting, or caving of the high bank. All damaged surfaces shall be restored to a minumum of their pre-construction condition.

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