Utilization of Steel Micro-fiber and Carbon Nanotubes in Self-compacting Lightweight Concrete
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJE-36-5_012
تاریخ نمایه سازی: 17 اردیبهشت 1402
Abstract:
In this research, the engineering characteristics of self-compacting lightweight concrete (SCLWC) containing carbon nanotubes and steel micro-fiber were evaluated. The variables included the amount of carbon nanotubes (۰, ۰.۰۲, ۰.۰۴, and ۰.۰۶% by weight of cement) and steel micro-fiber (۰, ۰.۵, and ۱% by volume). Lightweight expanded clay aggregate was used as lightweight aggregates. The experimental tests were self-compacting tests, compressive, splitting tensile, and flexural strengths, ultrasonic pulse velocity, electrical resistivity, water penetration depth, and scanning electron microscope. Adding ۰.۰۲ to ۰.۰۶ percent of carbon nanotubes to SCLWC reinforced with steel micro-fiber increases the compressive strength by about ۳۳ to ۶۴ percent. The use of ۰.۰۶% carbon nanotubes and ۱% steel micro-fiber increased the splitting tensile strength by ۳۶%. The use of carbon nanotubes and steel micro-fiber has the effect of influencing the filling of empty spaces and reducing concrete porosity. This can be attributed to the growing process of cement paste hydration and the filling of pores and capillary pores with the products of cement reactions, resulting in concrete compaction. Adding ۰.۰۲% carbon nanotubes to SCLWC samples containing ۰.۵% and ۱% steel micro fibers increased the ۲۸-day compressive strength by ۳۶%, ۳۴% and ۳۳% respectively.
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Authors
Y. Mohammadi
Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
M. Bagheripour Asil
Department of Civil Engineering, University of Guilan, Rasht, Iran
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