Abstract
Slurry infiltrated fiber concrete (SIFCON) is one of the recently developed construction material. SIFCON could be considered as a special type of fiber concrete with high fiber content. The matrix of SIFCON consists of flowing cement mortar or cement slurry. SIFCON has a very good potential for application in area where resistance to impact and high ductility are needed especially in designing the seismic retrofit, in the structures under impact and explosive effects and repair of structural reinforced concrete element. The main objective of this paper is to determine the effect of steel fiber content and silica fume (SF) cement replacement on the mechanical properties of SIFCON concrete. The percentage of SF replacement was 10% by weight of cement in SIFCON slurry, and three different volume fractions of hooked ended steel fiber (6, 8.5, and 11) % were used. The tested properties of SIFCON were compressive strength and splitting tensile strength which were carried out on standard size of cubes and cylinders respectively at the age of 7and 28 days. It was observed that the mechanical properties of SIFCON were affected in a positive manner by using silica fume as a partial replacement of cement and by adding steel fiber reinforcement in different percentages. The compressive and splitting tensile strength up to 83.7 MPa and 17.3MPa, respectively were obtained at the age of 28 days.
Highlights
Slurry Infiltrated Fibrous Concrete (SIFCON) is relatively a new high performance and advanced material [1] that differs from ordinary Fiber Reinforced Concrete (FRC) in terms of fabrication and composition [2].Fiber content in FRC generally varies from (1 to 3) % by volume, while the fiber content of Slurry infiltrated fiber concrete (SIFCON) can be anywhere from (4 to 20)% even though the current practice ranges from (4 to 12%, and when using hooked ended steel fiber with length more than 30 mm the fiber content range between (4 to10)%
While SIFCON is produced by first sprinkling fibers into a mold until it is completely filled, the fiber network of SIFCON is infiltrated by cement slurry [2, 4, 5]
The addition of silica fume was 10% by weight of cement, and superplastisizer of 0.5% to improve the workability of cement slurry .The water /cement ratio was kept constant as 0.4.The test results show that the compressive strength of SIFCON was increased to about (1.59 to 2.68) times when compared with the cement paste, while the increase in tensile strength was about (2.51 to 8.77) times than that of the cement paste
Summary
Slurry Infiltrated Fibrous Concrete (SIFCON) is relatively a new high performance and advanced material [1] that differs from ordinary Fiber Reinforced Concrete (FRC) in terms of fabrication and composition [2].Fiber content in FRC generally varies from (1 to 3) % by volume, while the fiber content of SIFCON can be anywhere from (4 to 20)% even though the current practice ranges from (4 to 12%, and when using hooked ended steel fiber with length more than 30 mm the fiber content range between (4 to10)%. Fume was 10% by weight of cement, and superplastisizer of 0.5% to improve the workability of cement slurry .The water /cement ratio was kept constant as 0.4.The test results show that the compressive strength of SIFCON was increased to about (1.59 to 2.68) times when compared with the cement paste, while the increase in tensile strength was about (2.51 to 8.77) times than that of the cement paste. They observed that the ductility and toughness of SIFCON were increased with increasing the volume fraction of steel fiber. There is very limited information about the behavior of SIFCON containing silica fume as a replacement of cement .the main aim of this research is to evaluate the effect of silica fume as a partial replacement (10% by weight of cement)and the effect of volume fraction of steel fiber ranging from (6 to 11%) on fresh and mechanical properties of SIFCON
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