Investigation of the Relationship between Rheological Properties and the Setting Time of Self-consolidating Concrete Mixtures by utilizing the Electrical Resistance Method

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Ghoddousi Parviz; Shirzadi Javid Ali Akbar; Bozorgmehr Behnam

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:6 Page(s): 193-206

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Title

Investigation of the Relationship between Rheological Properties and the Setting Time of Self-consolidating Concrete Mixtures by utilizing the Electrical Resistance Method

Author(s)

Ghoddousi Parviz | Shirzadi Javid Ali Akbar | Bozorgmehr Behnam | Issue Writer Certificate

Keywords

Setting timeQ1

RheologyQ2

WorkabilityQ2

Electrical resistanceQ2

Abstract

Several studies have been done on the rheological properties and Setting time of cementitious materials and mixtures, but the relationship between these two important features has not been studied so far. In this research, the main purpose of the done experiments, is to evaluate the relationships between the rheological properties and Setting time in self-consolidating concrete (SCC) mixtures. Rheology is the science of studying the materials deformation and flow and in general, in SCC mixtures, the most important variables are the rheological variables. The Setting time is also one of the most important parameters existing in all kinds of concrete mixtures. It should be noted that from the past up to now different definitions have been presented for the time of setting in various sources. As a short definition, it can be said that the Setting time is a period of time in which concrete changes from fluid phase to solid phase. In aspect of Rheology evaluations, Workability tests and rheometric experiments have been performed. Also in aspect of determining the Setting time, the main method used to determine the time of setting is the Electrical resistance measurement method (E. R. ). Despite there is a long time of using this method in determination the time of setting of concrete mixtures, there is no standard written for it. Therefore in this research said method and its results have also been brought under more precise verification and study (which can be referred to as a side purpose). For this purpose, the standard penetration resistance (P. R. ) method is used according to the ASTM C403. Based on the obtained results, it was found that the fault percentage of E. R. method in comparison with the standard P. R. method is about 5. 3% and 3. 59% in determining the initial and final Setting time respectively which was minor and negligible differences. Therefore, it was found that the results obtained by Electrical resistance method are reliable. Thus, by using the results obtained from the E. R. method, the existence or non-existence of relationships between the rheological properties and the Setting time was studied. According to the obtained results, it was found that there are behavioral and numerical relationships between these two issues. Based on the results it was found that in the SCC mixtures with lower slump flow and longer T50, the Setting time becomes shorter. This fact means that the lower willingness of flowability causes a decrease in Setting time of self-consolidating concrete mixtures. In the section of rheometric studies of the SCC mixtures performed by the rheometer, it was found that there are also important relationships between the yield stress and the Setting time. According to the achieved results, it was found that the higher yield stress led to occurrence of shorter Setting time and in connection to this issue, some numerical relations were also introduced. Thus, in this research it has been endeavored to study the relationship between the Setting time and Rheology properties in SCC mixtures as much as possible and obviate the existing gaps.

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APA: Copy

Ghoddousi, Parviz, Shirzadi Javid, Ali Akbar, & Bozorgmehr, Behnam. (2018). Investigation of the Relationship between Rheological Properties and the Setting Time of Self-consolidating Concrete Mixtures by utilizing the Electrical Resistance Method. MODARES CIVIL ENGINEERING JOURNAL, 18(6 ), 193-206. SID. https://sid.ir/paper/256726/en

Vancouver: Copy

Ghoddousi Parviz, Shirzadi Javid Ali Akbar, Bozorgmehr Behnam. Investigation of the Relationship between Rheological Properties and the Setting Time of Self-consolidating Concrete Mixtures by utilizing the Electrical Resistance Method. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(6 ):193-206. Available from: https://sid.ir/paper/256726/en

IEEE: Copy

Parviz Ghoddousi, Ali Akbar Shirzadi Javid, and Behnam Bozorgmehr, “Investigation of the Relationship between Rheological Properties and the Setting Time of Self-consolidating Concrete Mixtures by utilizing the Electrical Resistance Method,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 6 , pp. 193–206, 2018, [Online]. Available: https://sid.ir/paper/256726/en

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