Evaluation of the Strength compressive of Heavyweight Self-Compacting Concrete Using Non-Destructive Testing Methods

Document Type : Research Paper

Authors

1 Ph.D. Candidate, Department of Civil Engineering, Za.C., Islamic Azad University, Zanjan, Iran.

2 Professor, Department of Civil Engineering, Faculty of Technology, Guilan University, Rasht, Iran.

3 Assistant professor, Department of Civil Engineering, Za.C., Islamic Azad University, Zanjan, Iran.

Abstract

Nowadays, heavyweight concrete is widely used in structures such as buildings, bridges, power plants, and medical facilities. The aim of this study is to evaluate the strength of self-compacting heavyweight concrete using non-destructive tests and to investigate the properties of fresh concrete. In this research, the replacement ratio of heavyweight magnetite aggregate (0, 50, and 100%), with a maximum size of 15 mm, was considered as the main variable at different concrete ages (3, 7, 28, and 90 days). Additionally, silica fume was used at 6% by weight of cement as a dual-purpose material (filler and reactive), and limestone powder was employed at 25% replacement of sand as filler. In total, six mix designs were prepared, including three without silica fume and three with silica fume, and all specimens were cured in a moist environment. The results showed that the use of silica fume improved the filler effect and increased the compressive strength of both normal and heavyweight self-compacting concrete by about 8%. The 50% magnetite aggregate replacement demonstrated the best performance, increasing the 90-day compressive strength by about 10 MPa compared to the control sample, whereas 100% replacement only resulted in an increase of about 5 MPa. Moreover, the ultrasonic pulse velocity increased with concrete age; at 90 days, replacing 50% of the natural aggregate with heavyweight aggregate resulted in an increase of about 1.7% compared to the natural aggregate. In addition, the incorporation of silica fume improved the pulse velocity by 2–3% in all mixtures.

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References

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