A Study on Spent Catalyst Based Self - Compacting Concrete RC Beams with Conventional and GFRP Rebars

Ramadoss, Balamuralikrishnan; Alrawahi, Deema; Albalushi, Quds; Almahrizi, Shameem

doi:10.22059/ceij.2025.382140.2148

A Study on Spent Catalyst Based Self - Compacting Concrete RC Beams with Conventional and GFRP Rebars

Articles in Press

Authors

Balamuralikrishnan Ramadoss

Deema Alrawahi

Quds Albalushi

Shameem Almahrizi

Department of Civil and Environmental Engineering, College of Engineering, National University of Science and Technology, Muscat, Oman

10.22059/ceij.2025.382140.2148

Abstract

The whole work is divided into preliminary study and main study parts 1 & 2. In the preliminary phase, SCC mixes were prepared with 3%, 6%, 9%, and 12% SC as a partial replacement for cement. Standard 150 mm cubes were tested for compressive strength following BS standards using a 1000 kN capacity UTM. The optimum mix was identified as 9% SC with 3% superplasticizer and a water cement ratio of 0.58. In Main Study Part 1, conventional C30-grade and SC-based SCC blocks (400 × 200 × 200 mm) were tested after 7 and 28 days of curing. Results showed that SCC blocks with SC achieved 15% higher compressive strength than conventional concrete. Main Study Part 2 involved flexural testing of four reinforced beams (1500 × 125 × 200 mm) using conventional steel and glass fiber-reinforced polymer (GFRP) rebars. All the beams are tested using a 500 kN capacity loading frame. SCC-GFRP beams showed 33% lower ultimate load capacity, 48% higher deflection, and 56% lower ductility compared to SCC beams with conventional steel. Additionally, conventional beams exhibited 40% higher stiffness and no brittle failure, unlike the SCC-GFRP beams. Conventional rebar SCC beam exhibited no premature and brittle failure.

Keywords

SCC

Flexural behavior

GFRP rebar

Subjects