ASTM updates

[concreteguru]

ASTM has updated the following tests:

C231-04 Pressure Meter
C172-04 Sampling
C143-05 Slump
C1064-05 Temperature

I'm wondering if there are any significant changes in these
tests. Usually the changes are minor,but in 2001 they radically changed the procedure for the roller meter. Any changes in proceedure?

Thanks.

Fred J. Croen, RSM
Engius, LLC
Boston, MA
www: engius.com

 

[boffintech]

These are the changes. Are any significant????


Changes to ASTM C 143 Slump of Hydraulic-Cement Concrete. The interesting one is #5. I have seen techs use lengths of fiberglass tape or seamstress tape for measuring slump. This change would exclude that.

1) Added additional safety warning with footnote to 1.4.

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. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)

2) Added a new 5.1.1 about checking critical dimensions and renumbered subsequent sections.

5.1.1 Conformance to the mold’s critical dimensions shall be checked and recorded when it is purchased or first placed in service and at least annually thereafter.

3) Revised 5.1.2.1 to clarify and alter testing criteria for alternate materials.

5.1.2.1 Molds other than metal are allowed if the following requirements are met: The mold shall meet the shape, height, and internal dimensional requirements of 5.1. The mold shall be sufficiently rigid to maintain the specified dimensions and tolerances during use, resistant to impact forces, and shall be nonabsorbent. The mold shall be demonstrated to provide test results comparable to those obtained when using a metal mold meeting the requirements of 5.1. Comparability shall be demonstrated on behalf of the manufacturer by an independent testing laboratory. Test for comparability shall consist of not less than 10 consecutive pairs of comparisons performed at each of 3 different slumps ranging from 2 to 8 in. [50 to 200 mm] (Note 3). No individual test results shall vary by more than 0.50 in. [15 mm] from that obtained using the metal mold. The average test results of each slump range obtained using the mold constructed of alternative material shall not vary by more than 0.25 in. [6 mm] from the average of test results obtained using the metal mold. Manufacturer comparability test data shall be available to users and laboratory inspection authorities (Note 4). If any changes in material or method of manufacture are made, tests for comparability shall be repeated.

4) Added new Note 3 to clarify the term “consecutive pairs.”

NOTE 3—The phrase “consecutive pairs of comparisons” does not require being construed as meaning without interruption or all in one day. At a schedule selected by the testing entity, the pairs of tests leading to 10 consecutive pairs may be accomplished in small groups.

5) Added new 5.3 to provide description of suitable measuring device.

5.3 Measuring Device—A ruler, metal roll-up measuring tape, or similar rigid or semi-rigid length measuring instrument marked in increments of 1?4 in. [5 mm] or smaller. The length shall be at least 12 in. [300 mm].

Changes to C 172 Sampling Freshly Mixed Concrete since the last issue, C 172 – 99, that may impact the use of this practice. (Approved June 1, 2004)
1) Made an addition to 1.5 safety caveat.

2) Replaced “unit weight” with “density” in 6.1.

6.1 When the concrete contains aggregate larger than that appropriate for the size of the molds or equipment to be used, wet-sieve the sample as described below except perform density (unit weight) tests for use in yield computations on the full mix.

In C 1064 Temperature of Freshly Mixed Hydraulic-Cement Concrete, some changes were made to the section 9. Precision and Bias. Yawn………

changes to Air Content of Freshly Mixed Concrete by the Pressure Method since the last issue, C 231 – 97e1,

(1) Revised 1.5 by adding warning, deleting reference to procedural note, and adding footnote.
(2) Revised 2.1 to update referenced designations and correct titles.
(3) Corrected reference to dual designations in 1.2, 3.2, 4.15, 8.1.4, and Note 2.
(4) Changed Note A1.7 to section A1.7.1 and renumbered subsequent Note A1.8 to Note A1.7.
(5) Revised reference to Note A1.7 to reference section A1.7.1 in section A1.9.
(6) Editorially corrected spelling, punctuation, references, and SI unit equivalents in Note 1, 4.5, 4.7, 6.2, 8.2.3, 8.3.2, 9.1, 9.2, Note 10, 10.1.3, and A1.4.1.
(7) Revised 3.1 and 8.1.3 to improve wording.
(8) Note 4 altered to remove mandatory language.
(9) Volumetric SI units in 4.2 and 4.10 changed to litres.