The Impact of Concrete Curing in Environments Contaminated with Crude Oil on Microstructural and Macrostructural Parameters of Concrete

Document Type : Research Paper

Authors

1 Associate Professor, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran

2 Master Student, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran.

10.22124/jcr.2024.25976.1633

Abstract

The proliferation of petrochemical industries and oil refineries in the western region of Hormozgan province has led to the placement of numerous concrete structures in close proximity to organic pollutants. This proximity has the potential to significantly influence the resistance parameters and durability of concrete. Therefore, the primary objective of this article is to investigate the short-term and long-term effects of exposure to organic pollutants from crude oil on the microstructural properties and strength of concrete. This research entailed the evaluation of approximately 360 concrete samples. These samples underwent a 12-month curing process in emulsions containing varying concentrations of crude oil (0.5%, 1%, 1.5%, 2.5%, 5%, 10%, 25%, 50%, and 100%). Compressive strength tests were conducted at intervals of 1, 3, 7, 28, 90, and 365 days, with concurrent analysis of changes in permeability coefficient. Microstructural examination was carried out using Scanning Electron Microscope (SEM) images, while structural analysis was performed using EDX. Additionally, X-ray Diffraction (XRD) tests were conducted to study the formation of hydration products in environments contaminated with crude oil and to analyze the crystalline structure of the materials. The results reveal that the resistance of concrete samples cured in crude oil emulsions depends on the concentration of the emulsion. Notably, the compressive strength of samples cured in 100% crude oil concentration emulsion decreased by approximately 41% after 365 days when compared to the control sample. Specifically, the compressive strength dropped from 41 MPa to 24 MPa, while the permeability coefficient increased from 3.2*10-7cm/h to 15.3*10-7cm/h.

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Main Subjects

References

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