Optimum Steel Fiber Content of High Strength Pozzolime Concrete

Hamza, Sabreen M.; Al-Zuheriy, Ahmed Sh. J.; Hamza, Sabreen M.

doi:10.30684/etj.v39i12.2213

	Optimum Steel Fiber Content of High Strength Pozzolime Concrete
Engineering and Technology Journal
Article 16, Volume 39, Issue 12, December 2021, Pages 1869-1874 PDF (922.09 K)
Document Type: Research Paper
DOI: 10.30684/etj.v39i12.2213
Authors
Sabreen M. Hamza^* ¹; Ahmed Sh. J. Al-Zuheriy²; Sabreen M. Hamza²
¹Civil Engineering Department , Geotechnical , University of technology, Baghdad, Iraq.
²Civil Engineering Dept., University of Technology-Iraq, Alsina’a street,10066 Baghdad, Iraq.
Abstract
Pozzolime is a promising alternative binder, compared to Portland cement because of its low CO₂emission. it is produced by mixing hydrated lime, silica fume, and fly ash. Fiber is added to concrete to improve the durability, mechanical properties of the structure, and others. In this study, high-strength Pozzolime concrete was reinforced with hooked-end steel fiber which was added as fractions of volume of 0.5, 1, 1.5, and 2%. Optimization for fiber content was performed according to the workability and strength of the fiber-reinforced mixture. Obtained results showed that the compressive strengths at 14d and 90d increased by 71.4% and 58.3% respectively when adding 1.5% steel fiber. Correspondingly, the 14d, 28d, and 90d flexural strength of pozzolime concrete increased by 170.4%, 203.2%, and 191.4% respectively at 1.5% and a further increase in fiber content caused a reduction in strength. The finding presented in this research confirmed that the volume fraction (1.5%) can be considered as the optimum content.
Highlights
In UHPC, autogenous shrinkage dominates over the drying shrinkage. High pouring temperature and coarse sand increase the number and size of pores. Increasing silica fume over 25% of cement content reduces compressive strength. Adding steel or basalt fibers minimize the inverse effect of autogenous shrinkage.
Keywords
compressive strength; flexural strength; Hooked end steel fiber; Optimum Value; Steel fiber pozzolime reinforced concrete Workability

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