Evaluation of Flexural Performance in UHPC(Ultra High Performance Concrete) According to Placement Methods

Abstract:

Apart from its high compressive, tensile and flexural strengths reaching approximately 200MPa, 15MPa and 35MPa, respectively, Ultra High Performance Concrete (UHPC) is characterized by its high resistance against degrading factors that can delay their penetration and diffusion speeds down to 1/20 to maximum 1/10,000 compared to ordinary concrete. UHPC also exhibits self-compaction properties with a slump flow of about 220mm. Furthermore, the most remarkable feature of UHPC is the improvement of its flexural strength and toughness through the admixing of steel fiber. Accordingly, this study evaluates the effects of the placement method on the flexural performance of UHPC. As a result, the flexural strength of UHPC appears to be extremely dependent on the placement method with variation of the maximum flexural strength up to 2 to 3 times while poor influence is observed on the initial crack strength.

• Periodical: Key Engineering Materials (Volumes 417-418)
• Pages: 581-584
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.417-418.581
• Online since: October 2009
• Authors: Gum Sung Ryu, Su Tae Kang, Jung Jun Park, Gyung Taek Koh
• Keywords: Compressive Strength, Ductility, Fiber, Flexural Strength, Placement Method, UHPC

References

[1] Richard, P. and Cheyrezy, M., Composition of Reactive Powder Concrete, Cement and Concrete Research, Vol. 25, No. 7, 1995, pp.1501-1511.

DOI: 10.1016/0008-8846(95)00144-2

[2] Naaman, A.E. and Reinhardt, H.W., Characterization of High Performance Fiber Reinforced Cement Composites-HPFRCC, " Proceedings of the Second International Workshop 'HPFRCD2, 1995, pp.3-6.

DOI: 10.51202/9783816793977-3

[37] 3 0. 834.

[38] 2.

067 16. 0 9. 3.

[9] 3.

[35] 8 0. 562 0. 060 16. 8 8. 6.

[41] 5 0. 944 0. 069 17. 2 10. 2 Partition.

[32] 7 0. 376.

[36] 2.

062 17. 0 7. 1.

[8] 2.

[33] 1 0. 520 0. 073 15. 4 6. 6.

[36] 4 0. 775 0. 069 9. 9 8. 7.

[42] 8 0. 862 0. 047 17. 4 10. 4 Bending direction.

[34] 4 1. 033.

[33] 3.

082 9. 7 9. 3.

[8] 2.

[34] 4 0. 885 0. 072 14. 9 8. 1.

[31] 2 0. 705 0. 078 15. 5 7. 3 Bending normal direction.

[11] 7 0. 053.

[13] 7.

053 11. 7 1. 7.

[1] 8.

[15] 9 0. 069 0. 069 15. 9 1. 2.

[13] 6 0. 099 0. 032 10. 5 1. 9.

[13] 6 0. 068 0. 068 13. 6 2. 3 Hook.

[29] 8 0. 845.

[32] 3.

047 9. 0 6. 9.

[7] 7.

[31] 9 0. 638 0. 084 16. 4 7. 8.

[35] 2 1. 160 0. 086 13. 1 8. 5 Placement at center.

[40] 7 1. 008.

[35] 3.

085 15. 6 9. 9.

[8] 5.

[32] 4 0. 705 0. 065 14. 7 7. 8.

[30] 1 0. 661 0. 073 16. 4 6. 6.

[30] 5 0. 714 0. 071 16. 2 7. 2.

[43] 1 1. 363 0. 079 16. 5 11. 0.