Scholarlink

In reinforced concrete structures, rebar couplers are used to increase durability, weight-carrying capacity, and structural integrity. UHPC is a good option for conventional concrete substitution to coat the rebar couplers since it may improve the pier’s durability and strength. However, the usage of UHPC might influence the behavior of reinforcement and may enhance its tensile strength. Therefore, the objective of this study is to determine the optimum compressive strength of Ultra-High-Performance Concrete (UHPC) by applying different percentages of superplasticizer, which are 1.6%, 2%, 3% and 4% by the total weight of the binder, to determine the ultimate tensile strength of rebar couplers embedded in UHPC by using direct tensile test and to determine the mode of failure of NSC and UHPC embedded on coupled rebars after being subjected to direct tensile test. Two percentages of superplasticizers have been chosen out of four dosage percentages of superplasticizer for the embedded concrete mix design since it gave the highest compressive strength result. The maximum compressive strength of UHPC with 1.6%, 2%, 3% and 4% dosage of superplasticizer by total weight of binder at Day-28 were 52.76 MPa, 88.35 MPa, 77.48 MPa and failed by unhardened after 24 h of casting. The tensile strength of UHPC-coated coupled steel rebars was 72.84 kN with a mean breaking point of 62.55 kN. The mean deformation of the specimens was 37.63mm. Meanwhile, the ultimate tensile capacity of NSC-coated coupled steel rebars was 72.90 kN with a mean breaking point of 71.0 kN, and the mean deformation of the specimens was 44.23mm. All the samples of UHPC-coated coupled steel rebars and NSC-coated coupled steel rebars failed due to bar fractures. The tensile strength of rebars stays largely unaffected when embedded in UHPC since the tensile capacity of both types of specimens did not show huge differences, which is only 0.08%.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Strength Performance of Mechanical Couplers for Reinforcement Bar Splices Embedded in Ultra-High-Performance Concrete (UHPC) Using Different Percentage Dosage of Superplasticizer

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Yazmin Sahol Hamid,
  • Mohd Afiq Mohd Fauzi,
  • Muhd Norhasri Muhd Sidek,
  • Dinamic Berinau Aanak Ugik,
  • Gibryan Thian Shun Lung,
  • Muntasir Billah,
  • Nursafarina Ahmad

摘要

In reinforced concrete structures, rebar couplers are used to increase durability, weight-carrying capacity, and structural integrity. UHPC is a good option for conventional concrete substitution to coat the rebar couplers since it may improve the pier’s durability and strength. However, the usage of UHPC might influence the behavior of reinforcement and may enhance its tensile strength. Therefore, the objective of this study is to determine the optimum compressive strength of Ultra-High-Performance Concrete (UHPC) by applying different percentages of superplasticizer, which are 1.6%, 2%, 3% and 4% by the total weight of the binder, to determine the ultimate tensile strength of rebar couplers embedded in UHPC by using direct tensile test and to determine the mode of failure of NSC and UHPC embedded on coupled rebars after being subjected to direct tensile test. Two percentages of superplasticizers have been chosen out of four dosage percentages of superplasticizer for the embedded concrete mix design since it gave the highest compressive strength result. The maximum compressive strength of UHPC with 1.6%, 2%, 3% and 4% dosage of superplasticizer by total weight of binder at Day-28 were 52.76 MPa, 88.35 MPa, 77.48 MPa and failed by unhardened after 24 h of casting. The tensile strength of UHPC-coated coupled steel rebars was 72.84 kN with a mean breaking point of 62.55 kN. The mean deformation of the specimens was 37.63mm. Meanwhile, the ultimate tensile capacity of NSC-coated coupled steel rebars was 72.90 kN with a mean breaking point of 71.0 kN, and the mean deformation of the specimens was 44.23mm. All the samples of UHPC-coated coupled steel rebars and NSC-coated coupled steel rebars failed due to bar fractures. The tensile strength of rebars stays largely unaffected when embedded in UHPC since the tensile capacity of both types of specimens did not show huge differences, which is only 0.08%.