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http://dx.doi.org/10.5345/JKIBC.2020.20.5.433

Feasibility Study of Modified Durometer to Evaluate Setting Time of the Concrete  

Han, Cheon-Goo (Department of Architectural Engineering, Cheong ju University)
Han, Min-Cheol (Department of Architectural Engineering, Cheong ju University)
Shin, Yong-Sub (Department of Architectural Engineering, Cheong ju University)
Publication Information
Journal of the Korea Institute of Building Construction / v.20, no.5, 2020 , pp. 433-440 More about this Journal
Abstract
In this study, a new type of Durometer was invented by modifying the currently used Durometer with the hemisphere shaped needle to columnar shaped needle. The aim of the study is, hence, to provide the feasibility of the advanced Durometer for assessing setting time of the concrete. Generally, the finishing of concrete surface should be conducted to secure the smooth surface, improve the permeability, and prevent the plastic shrinkage cracking. Although this surface finishing work should be conducted during the plastic phase between initial and final setting, currently in practical situations, the timing of starting the finishing work was determined by the sense of the worker. To improve this situation, Kato Junji suggested to use the hemisphere and needle shaped Durometers to determine the initial and final setting time, respectively. However, in this case, there are difficulties of using two different Durometers and of occurring failure of the Durometer due to the intruded cement paste. To prove the feasibility of new typed Durometer, setting time and surface hardness were evaluated by applying for the concrete with various replacing ratios of fly-ash and coal gasification slag as an aggregate.
Keywords
setting time of concrete; procter penetration resistance tester; modified durometer;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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