2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Evaluating the Potential advantages of Basalt FRP when compared with Carbon FRP and conventional steel.

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Author(s)
Ms. Yomna Hagras
Mr. Ramy Khalaf
Mr. Farid Mohamed
Mr. Ahmed Shehata
Ms. Amira Tobaa
Ms. Mariam Zaki
Ms. Reem Abou Ali
Mr. Mayer Farag, The American University in Cairo
Mr. Athnasious Ghaly, American University in Cairo
Mr. Magdi Madi, The American University in Cairo
Dr. Ezzeldin Yazeed Sayed-Ahmed, The American University in Cairo
Dr. Mohamed N. Abou-Zeid, The American University in Cairo (Presenter)
Abstract

The successful incorporation of steel as a reinforcement of concrete has been dominant over the past decades. However, steel corrosion represents a major threat in the construction industry. Therefore, the use of FRP composites as a reinforcement for concrete structures is in a continuous increase, due to their strengthening properties and significant resistance to corrosion. FRP systems exist as composites of a polymer matrix and a fibre. This fibre could be glass, aramid, carbon, or basalt. Numerous concerns exist regarding the use of glass, aramid, and carbon FRP with respect to the composite or its cost. The basalt FRP has been introduced but little research has been conducted to understand how it complements the advantages of an FRP system at a relatively low cost. Basalt is the most abundant volcanic igneous rock type in earth’s crust. Basaltic materials have a high performance in terms of strength, temperature range, resistance to acids, resistance to the alkalinity of concrete, and finally their lower cost grants them a high potential to replace carbon FRP and conventional steel. Continuous basalt fibres were first produced in 1984 and were found to require less energy than that required for glass or carbon fibres. Hence basalt fibres are environmentally safer than alternative FRP composites.

In this study attempts are taken to evaluate the performance of basalt FRP bars compared with carbon FRP bars and conventional steel bars. Fourteen specimens of RC are casted to fulfil this comparison. Eight are beams with common top reinforcement, stirrups spacing, and concrete properties. The difference is in bottom reinforcement where it was once steel, Carbon FRP, Basalt FRP, and a hybrid Basalt FRP and steel. These eight beams were tested for their behaviour under a flexure load through a four-point bending test. The six specimens were casted as columns with common stirrups spacing, and concrete properties. The behaviour of different reinforcements will be tested upon the application of an axial load.  The bonding strength between concrete and different bars is tested through bond pull-out test. Furthermore, tests will be conducted on the thermal, chemical, and mechanical properties of individual bars.

This work is expected to yield a better understanding of the properties offered by FRP, assess the potential advantages and disadvantages, and determine its cost effectiveness in an attempt to reach an economic utilization of this fibre that can help designers in making more educated selections when used in concrete works.