Analytical study of the effect of rheological parameters on the workability of self-consolidating concrete

Document Type : Research Paper

Authors

1 Civil faculty Sahand university of technology, Tabriz, Iran

2 Structure and Earthquake, Civil Engineering, IAUN, Najafabad, Iran

3 Civil faculty, Azarbaijan shahid madani university, Tabriz, Iran

10.22124/jcr.2023.23160.1600

Abstract

The most significant difference between self-consolidating concrete and ordinary concrete is workability, which allows self-consolidating concrete to fill the mold without vibrating operations. One of the main tests in determining the workability of self-compacting concrete is the L-box test, which can be used to check the permeability and filling properties of concrete. In this study, using Flow3D software, self-compacting concrete is investigated by evaluating the results of L-box test and the time when the concrete reaches a distance of 40 cm from the gate is recorded. For this purpose, the concrete used has plastic viscosity range of 10-38 (Pa.s), yield stress range of 14-75 (Pa), specific gravity of 2000 and 2500 (kg/m3) and elastic shear modulus of 100 and 1000 (Pa). In order to model the aggregates, spherical components with a diameter of 20 mm and a specific weight of 2500 kg/m3 have been used. To save time and evaluate the effective parameters in the amount of time required for the concrete to reach a distance of 40 cm from the gate (T40cm), the test design was performed by Taguchi method and 16 experimental designs proposed by this method in Minitab software. Been investigated. After analyzing the results by signal-to-noise method, it was observed that the plastic viscosity and yield stress of self-compacting concrete have the maximum and minimum effect on T40cm, respectively, which are consistent with the results of analysis of variance.

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