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<p>This study investigates the role of binder optimization and substrate surface texture in improving the bonding and mechanical behavior of fiber-reinforced Engineered Cementitious Composites (ECC) for use in concrete rehabilitation. ECC mixtures were developed using varying proportions of ground granulated blast furnace slag (GGBS) as a partial cement replacement, a fixed 2% volume of polyvinyl alcohol (PVA) fibers, manufactured sand (M-sand), and a controlled water-to-binder ratio. The bond performance between the existing substrate concrete and ECC overlays was evaluated through slant shear, split tensile, and prism tests using four surface textures: smooth, horizontal, rough, and diagonal. Mechanical and durability performance, including compressive strength, direct tensile strength, strain capacity, drying shrinkage, modulus of elasticity, impact resistance and rapid chloride permeability test, were also assessed. Microstructural analyses and bond tests between ECC and steel bars were conducted to study fiber distribution and interface bonding properties. The results demonstrated that the mixture incorporating 40% slag (designated G40) exhibited the best overall performance, particularly with a diagonal surface texture, achieving maximum bond strengths of 21.789&#xa0;MPa (slant shear), 3.98&#xa0;MPa (split cylinder), and 2.551&#xa0;MPa (prism). Additionally, G40 showed superior tensile strength (3.935&#xa0;MPa), strain capacity (3.784%) and impact resistance (59111 Nm) at 28 days. These findings highlight the potential of optimized ECC systems in structural rehabilitation by improving adhesion at the repair interface.</p>

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Binder optimization and surface texture effects on enhanced bonding performance of fiber-reinforced ECC in repair applications

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • N. Shanmugasundaram,
  • S. Praveenkumar,
  • P. S. Ashwin kumar,
  • S. Divya

摘要

This study investigates the role of binder optimization and substrate surface texture in improving the bonding and mechanical behavior of fiber-reinforced Engineered Cementitious Composites (ECC) for use in concrete rehabilitation. ECC mixtures were developed using varying proportions of ground granulated blast furnace slag (GGBS) as a partial cement replacement, a fixed 2% volume of polyvinyl alcohol (PVA) fibers, manufactured sand (M-sand), and a controlled water-to-binder ratio. The bond performance between the existing substrate concrete and ECC overlays was evaluated through slant shear, split tensile, and prism tests using four surface textures: smooth, horizontal, rough, and diagonal. Mechanical and durability performance, including compressive strength, direct tensile strength, strain capacity, drying shrinkage, modulus of elasticity, impact resistance and rapid chloride permeability test, were also assessed. Microstructural analyses and bond tests between ECC and steel bars were conducted to study fiber distribution and interface bonding properties. The results demonstrated that the mixture incorporating 40% slag (designated G40) exhibited the best overall performance, particularly with a diagonal surface texture, achieving maximum bond strengths of 21.789 MPa (slant shear), 3.98 MPa (split cylinder), and 2.551 MPa (prism). Additionally, G40 showed superior tensile strength (3.935 MPa), strain capacity (3.784%) and impact resistance (59111 Nm) at 28 days. These findings highlight the potential of optimized ECC systems in structural rehabilitation by improving adhesion at the repair interface.