An Experimental Investigation into the Mechanical Performance and Microstructure of Cementitious Mortars Containing Recycled Waste Materials Subjected to Various Environments

Document Type : Research Article

Authors

1 MSc, Semnan University, Semnan, Iran.

2 Professor,, Civil Faculty, Semnan University,

3 Semnan University

Abstract

This paper deals with an experimental investigation into the mechanical performance and microstructure characteristics of cementitious mortars containing recycled waste materials subjected to acidic, neutral, and alkaline environments. The recycled waste materials include glass, eggshell, iron, and rubber powder in various amounts, namely 7, 14, and 21% by volume, as the replacement for ordinary Portland cement (OPC). In this respect, to examine the mechanical performance of the specimens, the compressive, tensile, and bending strength tests as well as water absorption tests were carried out at the ages of 7, 28, and 90 days. Moreover, to study the microstructure of the specimens, scanning electron microscopy (SEM) and x-ray diffraction (XRD) tests were conducted accordingly. For curing the specimens, three different environments with PH values of 2.5, 12.5, and 7 representing the acidic, alkaline, and neutral environments, were taken into account. Promisingly, it was observed that the inclusion of recycled waste materials significantly enhanced the mechanical properties of the mortar when exposed to acidic curing conditions. Lastly, the results derived from the microstructure tests revealed that as a result of replacing cement with glass, iron, and eggshell powders, the width of cracks and volume of the pores decreased by three times, and importantly, the bonding between the cement paste and additives was strengthened.    

Keywords

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References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 12
March 2024
Pages 2365-2404

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