Journal Published Online: 01 October 2014
Volume 43, Issue 4

Difference in Setting Behavior between Prepared and Sieved Mortars in the ASTM C403 Time of Setting Test

CODEN: JTEVAB

Abstract

The setting time of concrete as measured by ASTM C403-08 is determined from the penetration resistance of mortar extracted from concrete by removing coarse aggregates larger than the 4.75 mm (#4) sieve. Tests by the authors and others have shown a difference in penetration resistance obtained from mortars extracted from concrete compared with penetration resistance of mortar intentionally mixed to represent the mortar fraction of the concrete of interest, as is noted qualitatively in ASTM C403. The authors report this difference quantitatively, having observed or discovered in the literature prepared mortars with an initial setting time up to 6 %–16 % greater than that of sieved mortar, and final setting time that is up to 3 %–16 % greater than that of sieved mortar. In general, these differences are 1 to 3 times greater than the single operator precision for acceptable range of test results, and are thus significant in the context of ASTM C403.

Author Information

Lee, Chang Hoon
School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY, US
Hover, Kenneth
School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY, US
Lee, Anna
School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY, US
Pages: 9
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20130301
ISSN: 0090-3973
DOI: 10.1520/JTE20130301