03 30 00.20.pdf

Charleroi Locks and Dam - Upper and Lower Guard Walls

SECTION TABLE OF CONTENTS

DIVISION 03 - CONCRETE

SECTION 03 30 00.20

CONCRETE: FIELD DEMONSTRATIONS

PART 1 GENERAL

1.1 REFERENCES

1.2 SUMMARY

1.2.1 Contractor's Key Personnel

1.2.2 Construction Methods

1.2.3 Testing Requirements

1.2.4 Contractor's Records

1.3 SUBMITTALS

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1 GENERAL

3.2 QUALITY CONTROL

3.3 GOVERNMENT FURNISHED CONCRETE

3.4 DEMONSTRATION OF DRILLED SHAFT CONSTRUCTION

3.4.1 Acceptance of Demonstration Shafts

3.5 EXECUTION OF FIELD DEMONSTRATIONS

3.6 CONCRETE SAMPLING AND TESTING

3.6.1 General

3.6.2 Core Samples

3.6.2.1 Demonstration Drilled Shaft

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SECTION 03 30 00.20 Page 1 W911WN-09-B-0004 Revised by Amendment No. 0002

SECTION 03 30 00.20

CONCRETE: FIELD DEMONSTRATIONS

PART 1 GENERAL

1.1 REFERENCES

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

ASTM INTERNATIONAL (ASTM)

ASTM C 1074 (2004) Standard Practice for Estimating Concrete Strength by the Maturity Method

1.2 SUMMARY

The purpose of this Section of the Specifications is to require demonstrations of various concrete placements to verify that the work will be performed in an acceptable manner, and will result in an acceptable product. The Contractor shall be fully responsible for planning and performing the work under this contract in accordance with the contract drawings and the specifications. The Contractor shall be fully responsible for determining the methods to perform the work in accordance with the contract documents. The Government reserves the right to verify that the Contractor's proposed methods, equipment and materials will be acceptable.

These demonstrations shall include the following:

Demonstration Drilled Shafts: The Contractor shall construct a representative large diameter demonstration drilled shaft, Lower Guard Wall type, to be constructed in the lower pool, and a representative demonstration drilled shaft, Upper Guard Wall type, to be constructed in the upper pool.

For each demonstration, the Contractor shall prepare a work plan in accordance with paragraph "SUBMITTALS"; perform the required construction;

and sample and test the concrete during the demonstration placement, and after the demonstration concrete has cured.

The demonstrations required under this Section of the Specifications will not relieve the Contractor from performing the work required under this contract in an acceptable manner. Any portion of work found not in compliance with the contract documents shall be cause for rejection. The Contractor shall remove the rejected work and replace it at no additional cost to the Government, if directed to do so by the Contracting Officer.

Proposed corrective plans and procedures, for any work not in compliance with the contract documents, shall be submitted to the Contracting Officer, for approval, prior to proceeding with any further construction.

1.2.1 Contractor's Key Personnel

The Contractor shall use key personnel during performance of the demonstration work who will subsequently be employed in the performance of

SECTION 03 30 00.20 Page 2 the actual work. The Contractor's CQC Management team shall be present during testing to discuss issues and solutions to problems revealed during subsequent testing.

1.2.2 Construction Methods

The Contractor shall utilize his proposed formwork, form ties, concrete placement, curing system, scaffolding, walkways, and other special features and methods which he proposes using for the production work in the demonstration concrete placements.

1.2.3 Testing Requirements

Testing of concrete shall be as specified herein and as otherwise required in the actual work as specified in the applicable Sections of the Specifications. Results of all testing shall be furnished to the Contracting Officer as specified herein and as otherwise required by the testing provisions of the applicable Sections of the Specifications. The Government reserves the right to require additional testing of the demonstration placements. The cost of such inspection will be borne by the Government or the Contractor in accordance with the Contract Clause

INSPECTION AND ACCEPTANCE.

1.2.4 Contractor's Records

The Contractor shall keep detailed written records, including written notes, photos and videotapes, to document all operations of the construction and testing of the demonstration concrete placements, indicating date, time, ambient conditions and location of the work or test being performed. Photographic records of the demonstration concrete placements shall be considered construction progress photos, and shall be performed in accordance with Section 01 32 33 DIGITAL PROGRESS IMAGES

Written documentation of work shall include date and the elements of formwork and embedments, reinforcing, and concrete placement completed as of that date. Written documentation of testing performed shall be as specified herein and as specified in the testing provisions of the applicable Sections of the Specifications. Daily progress reports shall include date, weather conditions, names and positions of each crew member, equipment used, work or tests performed, problems encountered and solutions arrived at. Reports shall be prepared and submitted to the Contracting Officer on a daily basis in accordance with Section 01 45 01 USACE QUALITY

CONTROL.

1.3 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. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Work Plans; G, RE

For each demonstration, the Contractor shall develop a work plan that depicts and specifies the construction procedures for the

SECTION 03 30 00.20 Page 3 demonstration facilities, and defines the methods of sampling and testing concrete and performing other tests as specified. The work plans shall include detailed drawings and general specifications for construction of the demonstration facilities.

The work plans shall contain a concrete plan in accordance with Section 03 30 00.10 CONCRETE: GENERAL REQUIREMENTS, a drilled shaft installation plan in accordance with Section 31 63 26.00 10 DRILLED SHAFTS, and the other submittals listed below. The work plans shall indicate the level of Engineering and Construction support to be provided during concrete placement demonstrations and oversight of the construction of the demonstration facilities. The work plans shall be neatly organized and legible. The work plans shall include the definition of parameters to be studied and the purposes of the field demonstration. Calculations shall be checked and initialed, and contain references and assumptions.

In addition to drawings required under submittal paragraph "SD-02 Shop Drawings" below, the work plan shall contain drawings that detail the areas to be used for the demonstrations, configuration and layout of the simulated structures and the concrete placement methods to be used, including tremie pipes and support structures and equipment.

For each demonstration placement, the Contractor shall submit a listing of parameters to be tested, and the Contractor proposed methods of performing the tests, including sampling and testing.

Results of all tests shall be submitted in accordance with submittal paragraph "SD-06 Test Reports" below.

Experience Records; G, RE

For each demonstration placement, the Contractor shall submit names, positions, and resumes of all key personnel that will be performing the demonstration work to the Contracting Officer for approval, before beginning work on the demonstrations.

Qualifications of Contractor's quality control personnel shall be submitted in accordance with Section 01 45 01 USACE QUALITY

CONTROL.

Demonstration Drilled Shafts; G, RE

The Contractor shall provide the submittals required by Section 31 63 26.00 10 DRILLED SHAFTS, paragraph "SUBMITTALS", subparagraph "SD-01 Preconstruction Submittals". The work plan shall include methods for monitoring and reporting the open shaft.

SD-02 Shop Drawings

Demonstration Drilled Shafts; G, RE

The Contractor shall provide the submittals required by Section 31 63 26.00 10 DRILLED SHAFTS, paragraph "SUBMITTALS", subparagraph "SD-02 Shop Drawings".

SD-06 Test Reports

Concrete Testing Results; G, RE

SECTION 03 30 00.20 Page 4

The results of all concrete tests shall be submitted in accordance with the applicable testing provisions of Division 03 CONCRETE, of the Specifications.

Demonstration Drilled Shafts; G, RE.

The Contractor shall provide the submittals required by Section 31 63 26.00 10 DRILLED SHAFTS, paragraph "SUBMITTALS", subparagraph "SD-06 Test Reports". The test reports shall indicate the drilled shafts used for the demonstrations, and shall indicate the results of concrete integrity tests performed. The report shall indicate all corrective actions and revisions to methods that occurred during the demonstrations. The report shall be approved by the Contracting Officer before further drilled shaft construction is permitted. Unless otherwise directed, test reports shall include shaft monitoring data.

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1 GENERAL

For each demonstration concrete placement, the Contractor shall:

a. Develop a Work Plan that depicts and specifies the construction procedures for the demonstration facilities, and defines the methods of sampling and testing concrete, and shall include all submittals specified herein in paragraph "SUBMITTALS", subparagraphs "SD-01 Preconstruction Submittals" and "SD-02 Shop Drawings". All proposed designs and calculations shall be checked and initialed.

b. Construct required demonstration facilities that represent the feature being demonstrated, including preparation for concrete placement.

c. Perform CSL testing of the demonstration drilled shafts, and produce an analytical report of the test results.

d. Sample (core drill) and test concrete after demonstration concrete has cured and provide a report of all test results.

e. Provide any other test results as specified herein and as otherwise required in the actual work as specified in the applicable Sections of the Specifications.

3.2 QUALITY CONTROL

The Contractor shall implement a process of Quality Control for the test program in accordance with Section 01 45 01 USACE QUALITY CONTROL, and perform quality control in accordance with the applicable sections of these specifications.

3.3 GOVERNMENT FURNISHED CONCRETE

The Government will provide concrete for the demonstration as specified in Section 03 30 00.40 CONCRETE: MIXTURE PROPORTIONING.

SECTION 03 30 00.20 Page 5

3.4 DEMONSTRATION OF DRILLED SHAFT CONSTRUCTION

The Contractor shall demonstrate the proposed procedures and methods contained within the Drilled Shaft Installation Plan and concrete plan, prior to any production drilling. This shall be accomplished by successfully completing one full Type 2Lower Guard Wall Type demonstration drilled shaft with rock socket diameter of 114 inches, a permanent casing with 102-inch diameter, and a 10-foot diameter temporary casing, per Type 2 Lower Guard Wall Type dimensions, reinforcement and concrete. The demonstration drilled shaft shall not be a production drilled shaft, and will be paid for separately in accordance with Section 01 22 00.00 10 MEASUREMENTS AND PAYMENT. The demonstration drilled shaft shall be located in an area chosen by the Contractor that is within the allowable work and access areas in the lower pool downstream of the dam, and approved by the Contracting Officer. After successful completion of the demonstration drilled shaft, the Contractor may reuse it as a dolphin, mooring post, or other facility constructed for the convenience of the Contractor, but shall be removed completely at the completion of the contract. The demonstration drilled shaft shall be completed immediately prior to any construction of the production drilled shafts. Once the approved Drilled Shaft Installation Plan and concrete plan are approved by the Contracting Officer, the Contractor shall perform the construction of the Type 2Lower Guard Wall Type Demonstration Shaft according to the Proposed Construction Sequence on Contract Drawing 037-LCH-20/LG5

3.4.1 Acceptance of Demonstration Shafts

If the demonstration drilled shafts are not installed successfully, the Contractor's methods shall be adjusted accordingly, appropriate revisions shall be made to the Drilled Shaft Installation Plan or concrete plan as appropriate, and the revised plans shall be submitted to the Contracting Officer for review and comment. The Contracting Officer reserves the right to require another demonstration drilled shaft, at the Contractor's expense. No production drilled shafts shall be installed until the prescribed Demonstration Shaft of the same type and any additional demonstration shafts are successfully installed and accepted by the Contracting Officer. All revisions to the original Drilled Shaft Installation Plan and concrete plan shall also be completed and approved by the Contracting Officer prior to releasing the production drilled shafts for construction. All production drilled shafts shall be constructed in accordance with the methods and procedures detailed in the final Drilled Shaft Installation Plan, including any approved revisions, following the completion of the demonstration drilled shafts.

3.5 EXECUTION OF FIELD DEMONSTRATIONS

The concrete placement demonstrations shall be supervised by the Contractor's Concrete Foreman and witnessed by the Contracting Officer.

Concrete will be sampled and tested by others. The Contractor shall provide all other necessary Engineering and Construction support for conduct of the concrete demonstrations. The demonstration concrete shall be placed in accordance with the procedures contained within the approved Work Plan.

3.6 CONCRETE SAMPLING AND TESTING

3.6.1 General

The Contractor shall develop procedures for sampling, inspection and

SECTION 03 30 00.20 Page 6 testing of the concrete mixtures placed during the demonstrations. The procedures shall be coordinated with the Contracting Officer, and shall conform to the requirements contained in the applicable concrete Sections of the Specifications for the actual work and as required herein. The test data shall be compiled and a copy of the report provided to the Contracting Officer. CSL testing shall be conducted for the demonstration shafts in accordance with Section 31 63 26.00 10 DRILLED SHAFTS, except that CSL testing shall be conducted at concrete strengths of 1000 psi, 2000 psi and 3000 psi. In place strength of the demonstration shaft concrete shall be determined in accordance with ASTM C 1074 as outlined in contract section 03 30 00.60, PLACEMENT REQUIREMENTS, paragraph "Determination of In-place Concrete Strength".

3.6.2 Core Samples

The quality of the in-place concrete shall be visually inspected by means of core extraction. Cores shall be extracted in accordance with the following subparagraphs. Coring shall not be performed until the concrete is a minimum of 21 days old and the concrete shall have gained adequate strength to allow the cores to be extracted without damage. The Government reserves the right to order additional coring or coring of larger or smaller diameter. Additional coring required to investigate defects resulting from the Contractor's methods and procedures shall be at no cost to the Government. All cores extracted are the property of the Government. All cores shall be logged and placed in core boxes and shall be turned over to the Government. Cores shall not be taken any sooner than 21 days, and shall be tested for strength at 28 and 90 days.

3.6.2.1 Demonstration Drilled Shaft

The demonstration drilled shaft shall be inspected by extracting 6 cores.

The location of the cores shall be as determined by the Contracting Officer and located based on the results of the CSL testing. These four cores shall have a minimum nominal diameter of 2.5 inches. The cores shall be extended into rock and shall recover a minimum of 3 feet of rock to allow for inspection of the concrete/rock interface. The remaining two cores shall be extracted from the area located between the casing and the reinforcement cage. For these two cores, the core diameter shall be an adequate size to retrieve representative samples of concrete, but shall not be greater than 2 inches. Drilling may be terminated if steel is encountered and prevents advancement of the drill bit.

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SECTION 03 30 00.20 Page 7

1.3 SUBMITTALS