Journal Published Online: 01 March 2019
Volume 48, Issue 1

The Comparison and Introduction of Plate Test and Electrical Resistance Methods of Determining the Setting Time and Thixotropy of Self-Consolidating Concrete

CODEN: JTEVAB

Abstract

Setting time and rheology of mixtures are among the most important features in new generation concretes such as self-consolidating concrete (SCC) and can have a great impact on the behavior of fresh concrete. Therefore, introducing new methods for determining these parameters has always been one of the main concerns. In this research, we tried to determine a relationship between the measured setting time from the ASTM C403/C403M-08, Standard Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance Method, and the electrical resistance (ER) method, as well as the rheological parameters, including dynamic and static yield stress. Also, a new method for determining the setting time and concrete thixotropy—called the plate test method—is introduced and validated. The results indicated that the ER method is an accurate one in determining the initial and final setting time of SCC mixtures. Concrete mixtures with higher yield stress (static and dynamic) have a shorter setting time. Investigating the results indicated that the higher the static yield stress mean of the mixture in the time period of thixotropic behavior, the shorter the initial setting time. Therefore, increasing static yield stress is associated with a reduction in the setting time. In the case of dynamic yield stress, similar events occurred with static yield stresses, and an increase in this stress and its growth rate was associated with a reduction in the initial setting time. Furthermore, the results obtained by the new method (plate method), along with the results of rheology parameters measured by the rheometer device, indicated that the difference between results was in the range of 4 to 11 %. Also, the difference in the setting time obtained from the plate method in comparison with the penetration resistance method was 9 % at maximum. These results indicated that the plate test method has an acceptable accuracy in measuring the setting time and thixotropy.

Author Information

Shirzadi Javid, Ali Akbar
School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, Tehran, Iran
Ghoddousi, Parviz
School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, Tehran, Iran
Jaberizadeh, Mohammad
School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, Tehran, Iran
Bozorgmehr, Behnam
School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, Tehran, Iran
Pages: 15
Price: $25.00
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Details
Stock #: JTE20180326
ISSN: 0090-3973
DOI: 10.1520/JTE20180326