EFFECT OF WATER TO CEMENT RATIO AND SAND CONTENT ON ELECTRIC CONDUCTIVITY OF MORTAR

• KURUMISAWA Kiyofumi

  HOKKAIDO UNIVERSITY, Faculty of Engineering

• NAWA Toyoharu

  HOKKAIDO UNIVERSITY, Faculty of Engineering

Bibliographic Information

Other Title

• モルタルの電気伝導性に及ぼす水セメント比と骨材量の影響

Abstract

It is very important to evaluate the concrete durability for realizing sustainable society. The concrete durability is dependent on its transport properties. Therefore, it is necessary to measure the transport properties of concrete accurately. Nondestructive method is useful to measure transport properties of concrete. The resistivity measurement which is one of the nondestructive methods was proposed to measure the transport properties. It was reported that the resistivity and diffusion property is related. However, the resistivity（conductivity）is influenced by some factors such as aggregate content and water content of concrete. In this study, we investigated the conductivity of mortar for clarifying the effect of sand content or water to cement ratio（W/C）on the conductivity of mortar. As a result, mortar conductivity was dependent on its paste conductivity and the amount of sand. And it was possible to predict the conductivity of mortar by the proposed equation with water to cement ratio. It was shown that the effect of interfacial transition zone between sand and paste on conductivity is limited from the calculation of NIST model. It was clarified that there is good correlation between ultrasonic pulse velocity and electric conductivity of mortar. Finally, we suggested an equation to estimate the ultra-sonic pulse velocity of mortar from the conductivity.

Journal

• Cement Science and Concrete Technology

  Cement Science and Concrete Technology 68 (1), 171-177, 2014

  Japan Cement Association

Keywords

• Electric conductivity
• Ultrasonic pulse velocity
• Microstructure
• Interfacial transition zone
• Mortar

Details

• CRID: 1390282679805994368
• NII Article ID: 130005129357
• DOI: 10.14250/cement.68.171
• ISSN: 21873313
• ISSN: 09163182
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed