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ASTM D6103-04

ASTM D6103-04

Standard Test Method for Flow Consistency of Controlled Low Strength Material (CLSM) (Withdrawn 2013)

2013-07-10 /Withdrawn
No replacement
Significance and Use:

This test method is intended to provide the user with a procedure to determine the fluidity of CLSM mixtures for use as backfill or structural fill.

This test method is considered applicable to fresh CLSM containing only sand as the aggregate or having coarse aggregate smaller than 19.0 mm (¾ in.). If the coarse aggregate is larger than 19.0 mm (¾in.), the test method is applicable when it is made on the fraction of CLSM passing a 19.0 mm (¾ in.) sieve, with the larger aggregate being removed in accordance with the section on Additional Procedures for Large Maximum size Aggregate Concrete in Practice C 172.

Note 1—Removing the coarse aggregate will alter the characteristics of the mix and therefore will give information only about the remaining material. It is suggested that for mixes containing coarse aggregate 19.0 mm ( ¾ in.) or larger, a measurement of the slump is more appropriate.

For non-flowable CLSM, or for mixtures that do not come out of the flow cylinder easily, measure the slump as outlined in Test Method C 143.

This test method is one of a series of quality control tests that can be performed on CLSM during construction to monitor compliance with specification requirements. The other tests that can be used during construction control are Test Methods D 4832, D 6023, and D 6024.

Note 2—The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D 3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D 3740 does not in itself assure reliable results . Reliable results depend on many factors; Practice D 3740 provides a means of evaluating some of those factors.


1.1 This test method covers the procedure for determination of the flow consistency of fresh Controlled Low Strength Material (CLSM). This test method applies to flowable CLSM with a maximum particle size of 19.0 mm (3/4 in.) sieve.

1.2 The values stated in SI units are to be regarded as standard. The inch-pound equivalents are given for information only.

1.3 CLSM is also known as flowable fill, controlled density fill, soil-cement grout, unshrinkable fill, K-Krete, and other similar names.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

backfill; CLSM; construction control; flowable fill; flow consistency; flow cylinder; mix design; quality control; soil stabilization
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