03_34_00.pdf

Green Brook, Segment C-1

AMENDMENT # 1

SECTION 03 34 00

CONTROLLED LOW STRENGTH MATERIAL (CLSM)

PART 1 GENERAL

1.1 DESCRIPTION:

Provide and install controlled low strength material as indicated and specified.

1.2 REFERENCES

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

AMERICAN CONCRETE INSTITUTE INTERNATIONAL (ACI)

ACI 301 (2016) Specifications for Structural Concrete

ACI 304R (2000; R 2009) Guide for Measuring, Mixing, Transporting, and Placing Concrete

ACI 305R (2010) Guide to Hot Weather Concreting

ACI 306R (2016) Guide to Cold Weather Concreting

ACI 318 (2014; Errata 1-2 2014; Errata 3-5 2015;

Errata 6 2016; Errata 7-9 2017) Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14)

ASTM INTERNATIONAL (ASTM)

ASTM C31/C31M (2018a) Standard Practice for Making and Curing Concrete Test Specimens in the Field

ASTM C33/C33M (2018) Standard Specification for Concrete Aggregates

ASTM C39/C39M (2018) Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens

ASTM C494/C494M (2017) Standard Specification for Chemical Admixtures for Concrete

ASTM C618 (2017a) Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

ASTM C94/C94M (2017a) Standard Specification for Ready-Mixed Concrete

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ASTM C138/C138M (2017a) Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete

ASTM C1064/C1064M (2017) Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete

ASTM C143/C143M (2015) Standard Test Method for Slump of Hydraulic-Cement Concrete

ASTM C150/C150M (2018) Standard Specification for Portland Cement

ASTM C172 (2010) Standard Practice for Sampling Freshly Mixed Concrete

ASTM C231/C231M (2017a) Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

ASTM C940 (2016) Standard Test Method for Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the Laboratory

ASTM D75/D75M (2014) Standard Practice for Sampling Aggregates

ASTM D4832 (2010) Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders

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. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

Submit the following shop drawings in accordance with Section 01 33 00.

SD-01 Preconstruction Submittals

Work Plan; G, RO

SD-05 Design Data

CLSM Mix Design; G, RO Submit a CLSM mix design at least 14 calendar days prior to commencement of the work.

Submit manufacturer's stable-Air Genertor Admixture product data, installation instructions and recommendations for material use and results of strenght tests from trial mixes by the Contractor's testing laboratory firm.

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SD-06 Test Reports

Testing Requirements; G, RO

Submit the following data:

a. Any required deviations from prescribed tests and special handling instructions for test specimens.

b. Controlled Low Strength Material shall have a minimum strength of 100 psi and maximum strength of 200 psi according to ASTM D4832 at 28 days after placement. Controlled Low Strength Material shall achieve a minimum strength of 40 psi after 6 hours of curing.

c. Controlled Low Strength Material 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) as measured in Section 10 of ASTM C940.

d. Controlled Low Strength Material shall have a unit weight of 90 - 120 lbs./ft3 measured at the point of placement.

1.4 QUALITY ASSURANCE

Do not place CLSM until design mix, material tests and trial batch mix compression test results are approved by the EngineerCOR. Approval are required at least 30 days before placing any production CLSM.

Perform testing by a Corps validated commercial testing laboratory or the Contractor's validated testing facility. Submit qualifications of the Corps validated commercial testing laboratory or the Contractor's validated testing facilities. If the Contractor elects to establish testing facilities, do not permit work requiring testing until the Contractor's facilities have been inspected, Corps validated and approved by the Contracting Officer.

Furnish, pay for and deliver representative samples of sufficient quanity of cement, aggregates and admixtures required for trial batch mixes to the testing labratory. Obtain materials from the batching plant that will be supplying production CLSM in conformance with ASTM D75/D75M.

Measure all materials for CLSM, including water, with equipment and facilities suitable for accurate measurement and capable of being adjusted in conformance with ASTM C94/C94M. Use scales certified by local Sealer of Weights and Measures within one year of use and accurate when static load tested to plus or minus 0.4 percent of toal capacity of scale. Batch all materials by weight except admixtures that may be batched by volume.

The testing laboratory will take control test specimens; conduct slump tests and measure air content and temperature in the field.

Methods of Sampling and Testing:

1. Fresh Concrete Sampling: ASTM C172.

2. Specimen Preparation: ASTM C31/C31M

3. Compressive Strength: ASTM C39/C39M

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4. Air Content: ASTM C231/C231M

5. Slump: ASTM C143/C143M

6. Temperature: ASTM C1064/C1064M

7. Unit Weight: ASTM C138/C138M

1.5 WORK PLAN

Submit a work plan showing equipment and placement methods.

Include in the Work Planthe schedule of placement and anticipate time to complete the placement behind the culvert during the NJ Transit line weekend shutdown.

1.6 DELIVERY STORAGE AND HANDLING:

Order CLSM from batching plant so that trucks arrive at discharge locations when material is required.

Deliver CLSM to discharge locations in watertight agitator or mixer trucks without altering the specified properties of water-cement ration, slump, air entrainment, temperature and homogeneity.

Reject CLSM not conforming to specification, unsuitable for placement, exceeding the time or temperature limitations or not having a complete delivery batch ticket.

1.7 PROJECT/SITE CONDITIONS

Do not place CLSM until conditions and facilities for making and curing control test specimens are in compliance with ASTM C31/C31M and as specified herein.

PART 2 PRODUCTS

2.1 MATERIALS

Furnish Portland cement conforming to ASTM C150/C150M. Use one approved from one mill throughout the contract term unless otherwise approved by the EngineerCOR. Use Type II for all work, unless otherwise specified.

Water:

1. Use water that is potable and free from injurious amounts of oil, acid, alkali, organic matter or other deleterious substances, and conforms to the requirements for water in ASTM C94/C94M, and as specified herein.

2. The maximum water-soluble chloride ion in the water shall not exceed 0.060 percent by weight of cement.

Aggregates:

1. Use aggregates for CLSM conforming to ASTM C33/C33M and to the following requirements.

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Admixtures:

1. General Requirements: ASTM C494/C494M.

Fly Ash: Provide fly ash conforming to the following requirements:

1. Class F fly ash conforming to ASTM C618 for chemical and physical properties.

Maximum loss on ignition Supplemental requirements in percent:

Maximum carbon content 3 percent

Maximum sulfur trioxide (SO3) content 4 percent

Maximum loss on ignition 3 percent

Maximum water requirement (as a percent of control)

100 percent

Fineness, maximum retained on No. 325 sieve 25 percent

2.2 MIXES

CLSM Mix design shall produce a consistancy that will result in a flowable product at the time of placement that does not require manual means to move it into place.

Provide mix with compressive strength of minimum 100 psi and maximum 200 psi when measured 28 days after placement. Controlled Low Strength Material shall achieve a minimum strength of 40 psi after 6 hours of curing.

Controlled Low Strength Material 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) as measured in Section 10 of ASTM C940 “Standard Test Method for Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the Laboratory”.

The fresh unit weight shall be 90 - 120 lbs./ft3, except where specified, and in the absence of strength data the cementitious content shall be a maximum of 150 lbs./cy.

PART 3 EXECUTION

3.1 INSTALLATION:

Batch, mix and deliver CLSM in conformance with ASTM C94/C94M. Batch all constituents at a central batching or mixing plant.

Seasonal Conditions:

1. Conform to ACI 305R and as specified herein for hot weather concreting. Do not add retarder admixture to any concrete.

2. Do not place CLSM under cold weather as defined in ACI 306R

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3.2 TRANSPORTING AND MIXING

Conform to concentrating procedures set forth in ACI 304R and as specified herein.

Transport CLSM to discharge locations locations without altering the specified properties of water-cement ratio, slump, air entertainment, temperature and homogeneity.

3.3 FIELD TESTING

3.3.1 Testing Requirements

3.3.1.1 General

1. The testing laboratory will use concrete samples taken at the point of agitator or mixer truck discharge to preform slump, air content, and temperature tests and for field control test specimens.

3.3.1.2 Notification of Delivery:

1. Notify the EngineerCOR of concrete deliveries a minimum of 48 hours in advance of the scheduled placement. Include within this notification, the mix design and quantity of concrete, method and location of placement, frequency of trucks, ordered slump and time of initial delivery.

2. Furnish delivery batch ticket to the representative from the owner’s testing laboratory or to the Engineer representativeCOR in the field with each batch delivered to the discharge locations in conformance with ASTM C94/C94M.

3.3.1.3 Test Measurements at Discharge:

1. The testing laboratory firm will take measurement of concrete slump, air content and temperature for each 50 cubic yards (40 cubic meters) of each mix design but not less than once a day.

The laboratory will conduct the slump, air content and temperature test measurements in conformance with ASTM C143/C143M, ASTM C231/C231M, and ASTM C1064/C1064M, respectively.

2. The testing laboratory will submit test reports of field measurements specified above to the Contractor and to the Engineer

COR.

3.3.1.4 Control Test Specimens:

1. The testing laboratory will cast a minimum of one set of three field control test specimens in conformance with ASTM C31/C31M for each 150 cubic yards (115 cubic meters) of each mix design of concrete but not less than once a day.

2. Laboratory personnel will record truck and load number from the delivery batch ticket, the concrete placement location of each specimen, the date, concrete strength, slump, air content, temperature and truck driver's name.

3. Furnish tightly constructed nonabsorbent test cylinder molds. Use

SECTION 03 34 00 Page 6 molds of same type and manufacture for all test specimens. Leave molds on cylinders until received in testing laboratory.

4. Furnish boxes for initial curing of test cylinders in conformance with ASTM C31/C31M from time of fabrication until they are transported to the testing laboratory.

5. Field compression testing is required to determine the strength of the mix after placement to allow further construction operations.

Take a minimum of 6 sets of three specimens for field testing.

Test the field testing specimens as needed to monitor the strength gain of the placed mix. Notify and obtain the engineer'sCOR's approval for testing of each set.

6. The testing laboratory will compression test one of each set of three specimens at seven days. Immediately notify the Contractor and the EngineerCOR if the seven-day strength is deficient. Test the two remaining cylinders at 65 days for concrete strength acceptance. The acceptance test result is the average of the strengths of the two specimens tested at 56 days. The laboratory firm will submit compression test results of the control test specimens to both the Contractor and the EngineerCOR. Evaluation and acceptance of concrete shall conform to ACI 301 and ACI 318.

3.4 CURING AND PROTECTION:

Protect CLSM from premature drying, hot or cold temperatures, and mechanical injury, beginning immediately after placement and maintain concrete with minimal moisture loss at relatively constant temperature.

Comply with curing procedures set forth in ACI 301, applicable portions of ACI 308 and as specified herein.

Perform hot weather concreting in conformance with ACI 305R and as specified herein when the ambient atmospheric temperature is 80 degrees F or above.

Protect Controlled Low Strength Material from traffic until sufficient strength has been achieved for further construction operations. The CLSM has to achieve a minimum compressive strength of 40 psi according to ASTM C39/C39M after placement before further construction operations are allowed. In no case construction operations are allowed earlier than 2 hours after the placement is completed.

3.5 CLOSEOUT ACTIVITIES:

Provide in accordance with Section 01 78 00.

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