FLEXURAL BEHAVIOR OF SLURRY INFILTRATED FIBER CONCRETE (SIFCON) CONTAINING SUPPLEMENTARY CEMENTITIOUSE MATERIALS

Shakir Ahmed Salih,Qais Jwad Frayyeh,Manolia Abed Al-Wahab Ali

doi:10.31272/jeasd.2018.2.32

Abstract

Slurry Infiltrated fiber Concrete (SIFCON) is a relatively new high performance material and can be considered as a special type of Fiber Reinforced Concrete (FRC) with high fiber content. The matrix consists of flowing mortar or cement slurry which must infiltrate properly through the fiber network placed in molds. SIFCON possessing excellent mechanical properties coupled with large ductility and toughness values. SIFCON has found application in area where high ductility and energy absorption are needed especially in seismic-resistant reinforced concrete frames and in structure under abnormal or explosive loads. Other successful applications include pavement overlays, repair of prestressed beams and repair of structural reinforced concrete element.The main aim of this study is to determine the effect of hooked ended steel fiber content and mineral admixture replacement silica fume (SF) on strength and deformation characteristics of SIFCON specimens under flexural loading. Three volume fraction of steel fiber (6, 8.5, and 11) % were used in this investigation .The percentage of SF replacement was (10%), by weight of cement in SIFCON slurry. Both the flexural strength and toughness characteristic were carried out by testing specimens of 100*100*400 mm at the age of 7and 28 days. The results obtained from these tests were compared with those carried out on conventional fiber reinforced mortar (FRM) with 2% fiber content, as control specimens. The test results show superior characteristics of SIFCON ,as compared with normal FRM ,which were affected in positive manner by using cementitiouse materials (SF) as a partial replacement by weight of cement, and with increasing the volume fraction of steel fiber. The flexural strength and toughness value up to (28.08 MPa ) and (159 N.mm),respectively were obtained at age of 28 days.

Highlights

Slurry infiltrated fiber concrete (SIFCON) is different from normal Fiber Reinforced Concrete (FRC) in two aspects: fiber content and the method of production
The results of mini slump flow and V-funnel tests on fresh SIFCON mortars (S1 and S2) are presented in Table 2,which conformed to EFNARC criteria of sufficient filling ability, adequate flowability and viscosity .The experimental work show that using of High Range Water Reducing Admixture (HRWR) for the control mortar (S1) is very important to produce a homogeneous mixture possess the required properties with low w/c ratio
The test results show that using silica fume (SF), as a partial replacement of cement, increase the viscosity of SIFCON mortar, which can be controlled by using suitable dosage of HRWR

Summary

Introduction

Slurry infiltrated fiber concrete (SIFCON) is different from normal FRC in two aspects: fiber content and the method of production. SIFCON matrix has no coarse aggregates but a high cementitious content. It may mineral admixture such as silica fume, fly ash and latex emulsions. The matrix of SIFCON is either cement slurry or flowing mortar which is different from the concrete used in FRC that includes aggregate. These make the production of SIFCON is far different from FRC, which is fabricated by mixing fibers with fresh concrete, while SIFCON is prepared by infiltrating cement slurry into a bed of fibers preplaced and packed tightly in the molds[1]

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Conclusion