Due to the fast development of constructions in recent years, there has been a rapid consumption of fresh water and
river sand. In the production of concrete, alternatives such as sea water and sea sand are available. The near surface mounted
(NSM) technique is one of the most important methods of strengthening. Aluminum alloy (AA) bars are non-rusting and
suitable for usage with sea water and sand concrete (SSC). The goal of this study was to enhance the shear behaviour of SSCbeams strengthened with NSM AA bars. Twenty-four RC beams were cast from fresh water river sand concrete (FRC) and SSC
before being tested in four-point flexure. All beams are the same size and have the same internal reinforcement. The major
factors are the concrete type (FRC or SSC), the concrete degree (C25 or C50 with compressive strength = 25 and 50 MPa,
respectively), the presence of AA bars for strengthening, the direction of AA bar reinforcement (vertical or diagonal), and the AA
bar ratio (0, 0.5, 1, 1.25 and 2 %). The beams' failure mechanism, load-displacement response, ultimate capacity, and ductility
were investigated. Maximum load and ductility of C25-FRC-specimens with vertical and diagonal AA bar ratios (1%) were
100,174 % and 140, 205.5 % greater, respectively, than a matching control specimen. The ultimate load and ductility of all SSCbeams were 16-28 % and 11.3-87 % greater, respectively, for different AA bar methods than that of FRC-beams. The ultimate
load and ductility of C25-SSC-beams vertically strengthened with AA bar ratios were 66.7-172.7 % and 89.6-267.9 % higher
than the unstrengthened beam, respectively. When compared to unstrengthened beams, the ultimate load and ductility of C50-
SSC-beams vertically reinforced with AA bar ratios rose by 50-120 % and 45.4-336.1 %, respectively. National code proposed
formulae were utilized to determine the theoretical load of tested beams and compared to matching experimental results. The
predicted theoretical loads were found to be close to the experimental values.
