P-153.pdf
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- Attached to
- Repair Military Taxiway located at the Portland Air National Guard Base, Portland, Oregon
- Solicitation number
- W912JV-09-R-0008
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DIVISION 2 ITEM P-153 CONTROLLED LOW-STRENGTH MATERIAL (CLSM
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Text version
CONTROLLED LOW-STRENGTH MATERIAL (CLSM) P-153-1
DIVISION 2
ITEM P-153 CONTROLLED LOW-STRENGTH MATERIAL (CLSM)
DESCRIPTION
153.1.1 This item shall consist of furnishing, transporting, and placing a controlled low-strength material
(CLSM) as flowable backfill in trenches or at other locations shown on the plans or as directed by the
COR.
MATERIALS
153-2.1 MATERIALS
a. Portland Cement. Portland cement shall conform to the requirements of ASTM C 150 Type I. If for any reason, cement becomes partially set or contains lumps of caked cement, it shall be rejected.
Cement salvaged from discarded or used bags shall not be used.
b. Fly Ash. Fly Ash shall conform to ASTM C 618, Class C or F.
c. Fine Aggregate (Sand). Fine aggregate shall conform to the requirements of ASTM C 33 except for aggregate gradation. Any aggregate gradation which produces performance characteristics of the
CLSM specified herein will be accepted, except as follows.
Sieve Size Percent Passing by weight
3/4 inch 100
No. 200 0 - 12
d. Water. Water used in mixing shall be free of oil, salt, acid, alkali, sugar, vegetable matter, or other substances injurious to the finished product.
MIX DESIGN
153-3.1 PROPORTIONS. The contractor shall submit, to the COR, a mix design including the proportions and source of materials, admixtures, and dry cubic yard batch weights. The mix shall contain a minimum of 50 pounds of cement and 250 pounds fly ash per cubic yard, with the remainder of the volume composed of sand, water, and any approved admixtures.
a. Compressive Strength. CLSM shall be designed to achieve a 28-day compressive strength of
100 to 300 psi when tested in accordance with ASTM D 4832. There should be no significant strength gain after 28 days. Test specimens shall be made in accordance with ASTM C 31 except that the samples will not be rodded or vibrated and shall be air cured in their molds for the duration of the cure period.
CONTROLLED LOW-STRENGTH MATERIAL (CLSM) P-153-2
b. Consistency. Consistency of the fresh mixture shall be such that the mixture may be placed without segregation. A desired consistency may be approximated by filling an open-ended three-inch diameter cylinder, six inches high to the top, with the mixture and the cylinder immediately pulled straight
up. The correct consistency of the mixture will produce an approximate eight-inch diameter circular-type spread without segregation. Adjustments of the proportions of materials should be made to achieve proper solid suspension and flowable characteristics, however the theoretical yield shall be maintained at one cubic yard for the given batch weights.
CONSTRUCTION METHODS
153-4.1 PLACEMENT.
a. Placement. CLSM may be placed by any reasonable means from a mixing unit into the space to be filled. Agitation is required during transportation and waiting time. Placement shall be performed in such a manner that structures or pipes are not displaced from their desired final position and intrusion of
CLSM into undesirable areas is avoided. The material shall be brought up uniformly to the fill line shown on the plans or as directed to the COR. Each placement of CLSM shall be as continuous an operation as possible. If CLSM is placed in more than one layer, the base layer shall be free of surface water and loose of foreign material prior to placement of the next layer.
b. Limitations of Placement. CLSM shall not be placed on frozen ground. Mixing and placing may begin when the air or ground temperature is at least 35 degrees F and rising. At the time of placement, CLSM shall have a temperature of at least 40 degrees F. Mixing and placement shall stop when the air temperature is 40 degrees F and falling or when the anticipated air or ground temperature will be 35 degrees F or less in the 24 hour period following proposed placement.
153-4.2 CURING AND PROTECTION
a. Curing. The air in contact with the CLSM should be maintained at temperatures above freezing for a minimum of 72 hours. If the CLSM is subjected to temperatures below 32 degrees F, the material may be rejected by the COR if damage to the material is observed.
b. Protection. The CLSM shall not be subject to loads and shall remain undisturbed by construction activities for a period of 48 hours or until a compressive strength of 15 psi is obtained. The
Contractor shall be responsible for providing evidence to the COR that the material has reached the desired strength. Acceptable evidence shall be based upon compressive tests made in accordance with paragraph 153-3.1a.
MATERIAL ACCEPTANCE
153-5.1 Acceptance. Acceptance of CLSM delivered and placed as shown on the plans or as directed by the COR shall be based upon mix design approval and batch tickets provided by the Contractor to confirm that the delivered material conforms to the mix design.
CONTROLLED LOW-STRENGTH MATERIAL (CLSM) P-153-3
TESTING REQUIREMENTS
ASTM C 31 Making and Curing Concrete Test Specimens in the Field
ASTM C 39 Compressive Strength of Cylindrical Concrete
MATERIAL REQUIREMENTS
ASTM C 33 Specification for Concrete Aggregates
ASTM C 150 Specification for Portland Cement
ASTM C 618 Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Concrete
ASTM C 595 Specification for Blended Hydraulic Cements
END OF ITEM P-153
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