Studying effect of using seawater on the deep beams behavior reinforced with GFRP bars.

Document Type : Original Article

Authors

1 Civil engineering, mattrya.helwan university

2 Associate Professor of Structural Engineering, Faculty of Engineering, Mataria - Helwan University, Cairo,Egypt

3 Associate Professor of Structural Engineering, Faculty of Engineering, Mataria- Helwan University, Cairo, Egypt

4 Civil engineering department,matria,helwan university.

Abstract

Using seawater as an alternative of fresh water, due to fresh water scarcity, becomes common. On the other hand, using fiber reinforced polymers (F-R-P) as a replacement for conventional steel in marine environment is considered a promising solution to overcome steel corrosion. Thus, this investigation aims to understand the behavior of deep beams reinforced with glass fiber reinforced polymers (G-F-R-P) bars and cast using seawater as an alternative of fresh water. Experimental program is carried out using eight specimens of deep beams. Four reinforced concrete (RC) specimens with a compressive strength of 25 MPa and the other four RC deep beams with a compressive strength of 45 MPa. The test parameters were the longitudinal and transverse (traditional steel and G-F-R-P bars) bars, compressive strength (25 MPA or 45 MPa), mixing and curing used water (fresh water and seawater), and cement type (ordinary Portland cement and sulphated- resistant cement). Typical failure mode was crushing of the concrete diagonal strut as predicted from manual calculations using strut and tie model (S-T-M). All tested beams were failed after the propagation of cracks upwards to loading area or downwards to supporting area. The location of cracks was almost at the strut zones of tested beams. The analysis findings showed that the strength of reinforced deep beams with higher compressive strength was slightly higher than lower compressive strength deep beams. In addition, the overall sulphated- resistant cement performed better than ordinary Portland cement in sewer environment.

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