Mechanical Effect of Steel Fiber on the Cement Replacement Materials of Self-Compacting Concrete

Hisham Alabduljabbar,Abdulaziz Alaskar,Fahed Alrshoudi,Ahmed Fathi,Rayed Alyousef,Abdeliazim Mustafa Mohamed

doi:10.3390/fib7040036

Hisham Alabduljabbar, Abdulaziz Alaskar + Show 4 more

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https://doi.org/10.3390/fib7040036

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Abstract

The behaviors of the fresh and mechanical properties of self-compacting concrete (SCC) are different from those of normal concrete mix. Previous research has investigated the benefits of this concrete mix by incorporating different constituent materials. The current research aims to develop a steel fiber reinforcement (SFR)‒SCC mixture and to study the effectiveness of different cement replacement materials (CRMs) on the fresh and mechanical properties of the SFR‒SCC mixtures. CRMs have been used to replace cement content, and the use of different water/cement ratios may lower the cost of CRMs, which include microwave-incinerated rice husk ash, silica fume, and fly ash. Fresh behavior, such as flow and filling ability and capacity segregation, was examined by a special test in SCC on the basis of their specifications. Moreover, compressive and splitting tensile strength tests were determined to simulate the hardened behavior for the concrete specimens. Experimental findings showed that, the V-funnel and L-box were within the accepted range for SCC. Tensile and flexural strength increases upon the use of 10% silica fume were found when compared with other groups; the ideal percentage of steel fiber that should be combined in this hybrid was 2% of the total weight of the binder. Overall, steel fibers generated a heightened compressive and splitting tensile strength in the self-compacting concrete mixes.

Highlights

New concrete materials, such as self-compacting concrete (SCC), can prevent the segregation of their constituents and allow the concrete to flow under its weight and not by concrete vibrator
The final objective of this work was to determine the optimum percentage of steel fibers that can be added to concrete to enhance its properties
Crushed granite stone was used as the coarse aggregate with a nominal maximum size between 5 to 10 mm with a specific gravity of 2.66 in the surface saturated condition based on BS 812-103.21989

Summary

Introduction

New concrete materials, such as self-compacting concrete (SCC), can prevent the segregation of their constituents and allow the concrete to flow under its weight and not by concrete vibrator. SCC properties have been studied in the context of solving the workability defects of ordinary concrete, such as the low slump value [1,2,3]. To achieve this type of concrete mix and enhance the flow ability [4,5,6] the amount of cement should be increased, aggregate should be minimized, and concrete admixture should be added. The use of steel fibers in SCC-containing cement replacement materials (CRMs) will enhance its strength, increase the mechanical properties and durability of concrete structures, and bridge any cracks.

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