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The Effect of Polypropylene and Steel Fibers on the Properties of Concrete at Normal and Elevated Temperatures—A Review

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Iranian Journal of Science and Technology, Transactions of Civil Engineering Aims and scope Submit manuscript

Abstract

Fibers are especially used to boost different characteristics of concrete and to make concrete efficient, wherever it lacks performance. This study was carried after addition of synthetic fibers namely Polypropylene fibers and Steel fibers and their respective effects on some important characteristics of concrete like mechanical properties, crack analysis, permeability, and spalling at ambient and raised temperatures. It was found that polypropylene enhances the mechanical properties and impact resistance of concrete. An optimum quantity of fiber enhances these properties, but if fiber dosage exceeds the optimum dosage, there is a certain decrement in properties. Although the optimum percentage obtained was different for different properties, but in general, all properties got enhanced if the addition of polypropylene was less than 2%. Polypropylene also increased the spalling resistance of concrete up to 600 °C, but beyond 600 °C, it reduces the effect of spalling and could not prevent it entirely. The inclusion of steel fibers to concrete showed a significant positive influence on the mechanical properties at high temperatures and increased the temperature at which spalling occurs up to a dosage of 11.5%, beyond 1.5%, compressive strength decreases. Between 20 and 700 °C, steel fiber reinforced concrete showed 40% more split tensile strength than normal concrete.

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Abbreviations

Notations:

Full Form

CS:

Compressive strength

E/E’:

Relative elastic modulus

FA:

Fly ash

fc/f’c:

Relative compressive strength

FRC:

Fiber reinforced concrete

ft/f’t:

Relative tensile strength

fu :

Ultimate compressive stress

GGBS:

Ground granulated blast furnace slag

H–C:

Heating-cooling

HPC:

High-performance concrete

HPP:

High performance synthetic macro polypropylene

HPPF:

High performance synthetic macro polypropylene fibers

HSC:

High strength concrete

HyFRC:

Hybrid fiber reinforced concrete

M1:

Concrete mix with 0% fiber

M2:

Concrete mix with 1% fiber

M3:

Concrete mix with 1.5% fiber

M4:

Concrete mix with 2% fiber

MK:

Metakaolin

MOE:

Modulus of elasticity

NC:

Normal concrete

NSC:

Normal strength concrete

PP12:

Polypropylene fiber of 12 mm length

PPF:

Polypropylene fibers

PPFRC:

Polypropylene fiber reinforced concrete

PVA:

Polyvinyl alcohol (fibers).

RC:

Reinforced concrete

RC80/60 BN:

Dramix® bright and low carbon steel fiber reinforced concrete of fiber length 60 mm and slenderness ratio of 80 [ ø of fiber = 0.75 mm)

RCS:

Residual compressive strength

S0:

Self-compacting concrete mix with no polypropylene fibers (control mix)

SCC:

Self-compacting concrete

Sf:

Steel fiber

SF:

Silica fume

SFRC:

Steel fiber reinforced concrete

SP1:

Self-compacting concrete mix with 0.1% polypropylene fibers by volume

SP2:

Self-compacting concrete mix with 0.3% polypropylene fibers by volume

STS:

Split tensile strength

WPPF:

Waste polypropylene fibers

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Acknowledgement

This review work was carried by the 7 members and was not funded by any organization.

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Correspondence to Muhammad Dilawar Bhat.

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Bhat, M., Rehman, M.U., Shafi, I. et al. The Effect of Polypropylene and Steel Fibers on the Properties of Concrete at Normal and Elevated Temperatures—A Review. Iran J Sci Technol Trans Civ Eng 46, 1805–1823 (2022). https://doi.org/10.1007/s40996-021-00751-3

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  • DOI: https://doi.org/10.1007/s40996-021-00751-3

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