Investigating the effect of cement at different temperatures and durations on the rheological properties of the self-compacting concrete

Document Type : Research Paper

Authors

1 Assistant Professor, School of Civil Engineering, Islamic Azad University, South Tehran Branch

2 PhD student in Construction and Management Engineering, Islamic Azad University, South Tehran Branch

10.22124/jcr.2021.17818.1459

Abstract

The self-compacting concrete is more sensitive to changes in the temperature with respect to the ordinary concrete. Increase in the temperature affects the cement hydration rate and minor mistakes in the amount of used cement could bring about significant problems concerning the properties of self-compacting concrete, mostly affecting workability. Therefore in order to understand the cement mechanism in the self-compacting concrete, care should be exercised to regulate workability through right consumption of cement. In this research the temperature of the concrete mixtures was selected with respect to the ambient conditions in different seasons. Thus, after reaching the concrete temperature to the ambient temperature, the rheological properties of the self-compacting concrete with different amounts of cement as a function of mixing time, and temperature with water to cement ratio of 0.42 were investigated. According to the obtained results from the rheometer in terms of the yield stress and plastic viscosity during 60 minutes, it was found that addition of cement up to 440 kg/m3 improves the rheology. Furthermore referring to the results of this research it should be stated that for improving the rheology, one should prevent rise of temperature in the concrete and reduce the concrete placing time, otherwise it could result in concrete hardening and consequently reduced rheological properties.

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