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Materials and Structures

, 50:29 | Cite as

Optimization and performance of cost-effective ultra-high performance concrete

  • Weina Meng
  • Mahdi Valipour
  • Kamal Henri Khayat
Original Article

Abstract

This paper presents a mix design method for ultra-high performance concrete (UHPC) prepared with high-volume supplementary cementitious materials and conventional concrete sand. The method involves the optimization of binder combinations to enhance packing density, compressive strength, and rheological properties. The water-to-cementitious materials ratio is then determined for pastes prepared with the selected binders. The sand gradation is optimized using the modified Andreasen and Andersen packing model to achieve maximum packing density. The binder-to-sand volume ratio is then determined based on the void content, required lubrication paste volume, and compressive strength. The optimum fiber volume is selected based on flowability and flexural performance. The high-range water reducer dosage and w/cm are then adjusted according to the targeted mini-slump flow and compressive strength. Finally, the optimized UHPC mix designs are evaluated to determine key properties that are relevant to the intended application. This mix design approach was applied to develop cost-effective UHPC materials. The results indicate that the optimized UHPC can develop 28-days compressive strength of 125 MPa under standard curing condition and 168–178 MPa by heat curing for 1 days Such mixtures have unit cost per compressive strength at 28 days of 4.1–4.5 $/m3/MPa under standard curing.

Keywords

Conventional concrete sand Cost-effective Mix design Rheological properties Supplementary cementitious materials (SCMs) Ultra-high performance concrete (UHPC) 

Notes

Acknowledgments

This study was funded by the Energy Consortium Research Center of Missouri S&T under Grant No. SMR-1406-09 and the RE-CAST University Transportation Center at Missouri University of S&T under Grant No. DTRT13-G-UTC45. Certain commercial equipment, instruments, or materials are identified in this paper only in order to specify the experimental procedure.

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Copyright information

© RILEM 2016

Authors and Affiliations

  • Weina Meng
    • 1
  • Mahdi Valipour
    • 1
  • Kamal Henri Khayat
    • 1
  1. 1.Department of Civil, Architectural, and Environmental Engineering, MissouriUniversity of Science and TechnologyRollaUSA

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