Laboratory Evaluation of Electrical Resistance of Concrete

Document Type : Original Article

Authors

1 Chief of research and development of Tehran cement Co, Tehran, Iran

2 Assistant Professor of Road, Housing and Urban Development Research Centre, Tehran, Iran

10.22034/jcema.2022.333341.1082

Abstract

Common methods of controlling setting, hardness, process of strength concrete are tests for determining the setting time of mortar and concrete and determining the compressive strength of concrete It seems that these physical methods, do not fully reflect the behavior of concrete and the process of changing phase states during the hydration process; however, with the method of the electrical resistance of concrete, this observation is possible. Therefore, in this study, at the first stage, 11 samples of cement were prepared, the phases of which varied, but due to laboratory cementation, their fineness and grading conditions were almost the same. Physical and chemical analysis of cement samples was performed. In the next step, 22 concrete mixtures with 11 cement samples were prepared, so that 11 mixtures without additives and 11 mixtures with constant dosage of commercial super plasticizer. Also in the all concrete mixtures, the slump kept constant about 8 cm. Compressive strength tests of 7, 28 and 90 days hardened concrete were performed on concrete mixtures. Also, an electrical resistance test was performed, which was performed regularly from the time of cement contact with water until 31 days later. The results showed that at least three peaks of 8, 16 and 23 days in the electrical resistance curve are seen along the test time. In almost all samples, the electrical resistance is reduced to about 3 hours, which indicates the setting time of the concrete. Based on the results of this study, formula was presented.

Keywords

Main Subjects


Copyright © 2022 Ali Akbar Kafash Bazar. This is an open access paper distributed under the Creative Commons Attribution License. Journal of Civil Engineering and Materials Application is published by Pendar Pub; Journal p-ISSN 2676-332X; Journal e-ISSN 2588-2880.

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Volume 6, Issue 2
June 2022
Pages 99-111
  • Receive Date: 13 March 2022
  • Revise Date: 19 April 2022
  • Accept Date: 22 May 2022
  • First Publish Date: 28 June 2022