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<p>This study investigates the bond strength between recycled brick aggregate concrete (RBAC) and un-strengthened lap spliced reinforcing steel bars, contributing to sustainable construction practices. The research examines the effects of partial replacement of natural coarse aggregate (NCA) with recycled brick aggregates, concrete cover to bottom bar diameter ratio, and lap splice lengths on bond strength. Hardened properties of RBAC, having 20% and 40% replacement of NCA as RBAC20 and RBAC40, were assessed using cylindrical specimens after 28&#xa0;days of curing. Experimental elastic moduli values of RBAC were compared with existing predictive models and most of the existing models proved inadequate for RBAC application. Compressive strength tests revealed a reduction of 6% and 24% for RBAC20 &amp; RBAC40, respectively. Seven beam specimens were prepared with varying lap splice lengths, bottom concrete covers, and RBAC compositions. Experimental results were compared with numerical simulations using OpenSees, achieving ± 5% accuracy in load–deflection responses. The experimentally calculated stress in lap spliced steel was compared with existing models to assess their applicability to RBAC reinforced beams. Most of the existing models proved inadequate by lacking sufficient accuracy for their usage for beam prepared with RBAC. Consequently, a new model was developed using non-linear regression analysis and the proposed model demonstrates high accuracy with an R<sup>2</sup> value of 0.95, making it suitable for predicting stress in spliced steel in RBAC beams.</p>

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Experimental and Numerical Assessment of Bond Strength of Lap Spliced Steel Bars in Recycled Brick Aggregate Concrete

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Muhammad Adnan Hanif,
  • Ali Ejaz,
  • Muhammad Rizwan,
  • Maqsood Ahmed Bloach,
  • Muhammad Jawed Iqbal

摘要

This study investigates the bond strength between recycled brick aggregate concrete (RBAC) and un-strengthened lap spliced reinforcing steel bars, contributing to sustainable construction practices. The research examines the effects of partial replacement of natural coarse aggregate (NCA) with recycled brick aggregates, concrete cover to bottom bar diameter ratio, and lap splice lengths on bond strength. Hardened properties of RBAC, having 20% and 40% replacement of NCA as RBAC20 and RBAC40, were assessed using cylindrical specimens after 28 days of curing. Experimental elastic moduli values of RBAC were compared with existing predictive models and most of the existing models proved inadequate for RBAC application. Compressive strength tests revealed a reduction of 6% and 24% for RBAC20 & RBAC40, respectively. Seven beam specimens were prepared with varying lap splice lengths, bottom concrete covers, and RBAC compositions. Experimental results were compared with numerical simulations using OpenSees, achieving ± 5% accuracy in load–deflection responses. The experimentally calculated stress in lap spliced steel was compared with existing models to assess their applicability to RBAC reinforced beams. Most of the existing models proved inadequate by lacking sufficient accuracy for their usage for beam prepared with RBAC. Consequently, a new model was developed using non-linear regression analysis and the proposed model demonstrates high accuracy with an R2 value of 0.95, making it suitable for predicting stress in spliced steel in RBAC beams.