SECTION_03_34_13_-_Controlled_Low_Strength_Material_R1_0004.pdf

BUREAU OF INDIAN AFFAIRS OGLALA DAM SPILLWAY AND OUTLET WORKS

OGLALA DAM SPILLWAY AND OUTLET WORKS SECTION 03 34 13

JUNE 2023 CONTROLLED LOW STRENGTH MATERIAL

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SECTION 03 34 13

CONTROLLED LOW STRENGTH MATERIAL

PART 1 GENERAL

1.01 SCOPE OF WORK

A. This Section specifies the requirements for installation of controlled low-strength materials (CLSM) for toe drains.

1.02 REFERENCES

A. American Concrete Institute International (ACI)

1. ACI 229R Controlled Low Strength Materials

B. ASTM International (ASTM)

1. ASTM C33 Standard Specification for Concrete Aggregates

2. ASTM C94 Standard Specification for Ready-Mixed Concrete

3. ASTM C143 Standard Test Method for Slump of Hydraulic-Cement Concrete

4. ASTM C150 Standard Specification for Portland Cement

5. ASTM C172 Standard Practice for Sampling Freshly Mixed Concrete

6. ASTM C231 Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

7. ASTM C494 Standard Specification for Chemical Admixtures for Concrete

8. ASTM C595 Standard Specification for Blended Hydraulic Cements

9. ASTM C618 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

10. ASTM C940 Expansion and Bleeding of Freshly Mixed Grouts for Preplaced- Aggregate Concrete in the Laboratory

11. ASTM D4832 Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders

12. ASTM D5971 Standard Practice for Sampling Freshly Mixed Controlled Low- Strength Material

13. ASTM D6023 Standard Test Method for Density (Unit Weight), Yield, Cement Content, and Air Content (Gravimetric) of Controlled Low- Strength Material (CLSM)

14. ASTM D6103 Standard Test Method for Flow Consistency of Controlled Low Strength Material (CLSM)

BUREAU OF INDIAN AFFAIRS SECTION 03 34 13

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1.03 DEFINITIONS

A. CLSM: A highly flowable lean concrete mix consisting of a mixture of cement, fly ash, densely graded mineral aggregates, water and admixtures. CLSM shall be capable of freely flowing to fill all voids in trenches or other areas without compaction or other additional effort, shall be of uniform density, shall be of low permeability to prevent migration of adjacent fines into the set mix, and shall excavate easily.

1.04 SUBMITTALS

A. Shop Drawings

1. CLSM Mix Design:

a. Submit preliminary CSLM mix designs including recommended mixture proportions, sources of materials, and test results demonstrating the proposed mix design meets the requirements specified herein.

2. CLSM Placement Plan:

a. Fully describe the source of material, placement operations, and field testing.

Include details of proposed pipe bracing system to prevent pipe floatation during installation of CSLM. Provide buoyancy calculations and bracing requirements of the resisting members.

B. Administrative

1. Statement of Qualifications:

a. Mix designer.

C. Quality Control

1. Recordkeeping:

a. Batch tickets.

b. Test Reports: Submit field quality control testing reports within two working days of performing the tests. Provide the following information for all test reports:

1) Sample identification, including mix design.

2) Date and time of sample preparation, including curing conditions, curing period, and sample dimensions.

3) Date, time, and type of test.

4) Strength of each specimen.

5) Name and signature of individual performing the test.

6) Date, time, quantity, and location of concrete applied, with sketches.

7) Observations during production and placement.

8) Description of placement equipment.

9) Batch number(s), if applicable.

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10) Maximum and minimum air temperature.

11) Description of any special conditions or problems encountered.

12) Foreman’s name and signature.

1.05 QUALITY CONTROL

A. Qualifications

1. Mix designer shall be a licensed Professional Engineer or a SD DOT approved concrete mix designer, with a minimum of 1 year of experience in the design of CLSM mixes.

2. Batch plant shall be currently certified by the National Ready Mixed Concrete Association.

PART 2 PRODUCTS

2.01 CLSM MATERIALS

A. The CLSM mix design shall consist of Portland cement, fine aggregate, coarse aggregate, water and chemical admixtures to accelerate cure time and entrain air. Comply with the following requirements:

1. Cement shall meet the requirements of ASTM C150, Type I/II, or ASTM C595, Type IL.

2. Aggregate material shall meet the requirements of ASTM C33.

3. Admixtures shall meet the requirements of ASTM C494. CaCl shall not be used because of its corrosive nature and the availability of admixtures specifically designed for the purpose.

4. Pozzolanic Materials including fly ash shall meet ASTM C618 requirements.

B. Required properties and mix proportions of CLSM:

Type Maximum

Compressive Strength

Minimum Cementitious

Content (lbs/cy)

Slump (inches)

Entrained Air Content

CLSM 300 psi @ 28 days 50 6 to 8 15 – 20 %

1. CLSM Consistency:

a. The consistency of the CLSM shall be such that the material flows easily into all openings between the pipe and the lower portion of the trench and around all equipment. Where trenches are on a steep slope, a stiffer mix may be required to prevent the material from flowing down the trench.

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2. Slump:

a. Unless otherwise approved by the BIA Representative, the slump of CLSM shall have a slump cone value or lateral spread test of at least 8 inches as determined in general accordance with ASTM D6103 or ASTM C143, respectively.

3. Final Bleeding:

a. CLSM shall have minimal subsidence and bleed water, which is measured as a Final Bleeding of less than 2.0 percent (retains 98.0 percent of original height after placement, approximately 1/4 inch per foot of depth) per ASTM C940.

4. Fresh Unit Weight:

a. The fresh unit weight shall be 90 - 120 lbs/ft3.

5. Yield:

a. CLSM shall have an in-place yield of 98% of design yield.

PART 3 EXECUTION

3.01 GENERAL

A. The CONTRACTOR is responsible for the design of all CLSM mixes and for the quality of the CLSM placed in the Work.

B. Examine conditions of substrates and other conditions under which work is to be performed and notify AGENCY, in writing, of circumstances detrimental to the proper completion of the Work. Do not proceed until unsatisfactory conditions are corrected.

3.02 MIXING CLSM

A. The CLSM supplier shall determine the unit weights based upon the specific gravity of the fine and coarse aggregates.

B. Admixtures shall be added per the suppliers’ recommendations.

C. Water shall be added as specified and yield a flowability as noted above.

D. The minimum mix time required shall be specified by the supplier. Maximum mix time shall not exceed 2.5 hours.

3.03 APPLICATION OF CLSM

A. Secure pipe and equipment to be encased in CLSM to prevent displacement during placement.

B. Place CLSM in separate lifts as recommended by the pipe manufacturer to prevent the pipe from floating during installation.

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C. Place CLSM on both sides concurrently to prevent shifting of the pipe.

3.04 PROTECTION

A. Protect CLSM from traffic until sufficient strength has been achieved for further construction or traffic operations.

3.05 QUALITY CONTROL TESTING DURING CONSTRUCTION

A. CLSM shall be sampled and tested for quality control by the CONTRACTOR during placement as follows:

Requirement Test Method Number of Tests

Sampling fresh CLSM ASTM C172 except modified for slump per ASTM C94

As required for each test

Slump test ASTM C143

One for each truck load at point of discharge and one for each set of compressive strength tests

Air content by pressure method

ASTM C231

One for each set of compressive strength tests

Compression test specimens

ASTM D5971

One set of six standard cylinders for each compressive strength test

CLSM temperature --

Hourly when air temperature is 40 degrees F or below and 80 degrees F or above;

each time a set of compression test specimens are made

Compressive strength test ASTM D4832

One set for each 50 cubic yards or fraction thereof of placed in any one day; two specimens tested at 7 days, three specimens tested at 28 days and one specimen retained in reserve for testing if required

Bleed ASTM C940 One for each set of compressive strength tests

Unit Weight ASTM D6023 One for each set of compressive strength tests

END OF SECTION

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