Effect Of Lap Length On The Flexure Strength Of Rc Beams Using Self-Compacting Concrete

Abstract

This study investigates the influence of lap length on the flexural strength of reinforced concrete (RC) beams constructed using Self-Compacting Concrete (SCC). The primary objective is to evaluate how varying lap lengths, bar diameters, and lapping positions affect the structural behavior of RC beams, especially under flexural loading. Initially, the physical properties of constituent materials were tested, and a mix design was developed for M40 grade concrete. Both conventional concrete and SCC mixes were prepared and assessed for fresh and hardened properties, including workability, compressive strength, and durability. RC beam specimens were cast with different lap lengths and bar diameters, and the main reinforcement was lapped at various locations along the span to simulate practical construction conditions. Experimental testing focused on the flexural behavior of these beams, comparing the performance between conventional and SCC mixes. Results demonstrated that SCC provided superior performance in terms of uniform compaction and strength consistency, particularly when reinforcement congestion was present. Additionally, lap length and bar diameter significantly influenced the flexural strength of beams. Optimal lap lengths were identified for different conditions, providing key insights into enhancing the structural reliability and construction efficiency of RC elements using SCC. This research contributes valuable knowledge for structural engineers and practitioners aiming to improve design standards and field practices for reinforced concrete structures employing SCC.