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<p>Ultra-high-performance concrete (UHPC) is a robust cementitious material with high compressive strength exceeding 125&#xa0;MPa. UHPC can reach up to 80&#xa0;MPa after one day of casting, which expands the material application domain and makes it appealing for accelerated construction. The appropriate on-site quality control methods should be implemented to guarantee that desired UHPC design has been achieved. The cylinder specimens of 75&#xa0;mm diameter are used in the United States for quality control purposes. However, cylinders require surface preparation and grinding using special equipment, which consumes more time and affects the strength results at very early ages. Thus, this research aims to establish the conversion factors to use cubes confidently for UHPC quality control. To provide comprehensive and generalized results and allow for immediate implementation, this research considers, for the first time, five UHPC types and a total of eight mixtures with variable steel fiber (SFs) ratios, different cube sizes, and examines the compressive behavior at both early and late ages. The study provides results from about 900 specimens with different curing conditions sets and covers a wide range of strength from 7 to 140&#xa0;MPa. The experimental results assist in understanding the shape and size effect and revisit the cubes-to-cylinders strength conversion factors. A detailed application for strength maturity was also conducted to further validate the newly proposed conversion factors and extend the use of cubes for early age quality control. To summarize, this study presents new conversion factors for the cube compressive strength at an early age, in addition to recommendations for adopting the strength maturity method for quality control. The dataset of all tested specimens is also summarized and presented in the Appendices.</p>

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Compressive strength and maturity of UHPC cubes and cylinders: new conversion factors and recommendations for early-age quality control

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月16日

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  • Mohammed S. Ibrahim,
  • Mohamed A. Moustafa,
  • Shahrukh Shoaib

摘要

Ultra-high-performance concrete (UHPC) is a robust cementitious material with high compressive strength exceeding 125 MPa. UHPC can reach up to 80 MPa after one day of casting, which expands the material application domain and makes it appealing for accelerated construction. The appropriate on-site quality control methods should be implemented to guarantee that desired UHPC design has been achieved. The cylinder specimens of 75 mm diameter are used in the United States for quality control purposes. However, cylinders require surface preparation and grinding using special equipment, which consumes more time and affects the strength results at very early ages. Thus, this research aims to establish the conversion factors to use cubes confidently for UHPC quality control. To provide comprehensive and generalized results and allow for immediate implementation, this research considers, for the first time, five UHPC types and a total of eight mixtures with variable steel fiber (SFs) ratios, different cube sizes, and examines the compressive behavior at both early and late ages. The study provides results from about 900 specimens with different curing conditions sets and covers a wide range of strength from 7 to 140 MPa. The experimental results assist in understanding the shape and size effect and revisit the cubes-to-cylinders strength conversion factors. A detailed application for strength maturity was also conducted to further validate the newly proposed conversion factors and extend the use of cubes for early age quality control. To summarize, this study presents new conversion factors for the cube compressive strength at an early age, in addition to recommendations for adopting the strength maturity method for quality control. The dataset of all tested specimens is also summarized and presented in the Appendices.