141 / 2022-04-29 10:21:18

Flexural strength characteristics of SIFRCC according to the type of fine aggregates

Slurry Infiltrated Fiber Reinforced Cementitious Composite, Electromagnetic Pulse, Construction Technology Development

With the recent advancement of technology, strategic weapons and forms of terrorism that can cause great damage to human life and infrastructure are evolving. Concrete is generally a brittle material, and general concrete structures do not have sufficient resistance to sudden extreme loads such as collisions and explosions. As a result, additional human casualties may occur due to the collapse of structures and fragments caused by brittle fractures. Research to improve the disadvantages of concrete under such extreme loads and improve the impact resistance performance is actively in progress. However, research to improve the physical protection performance of existing structures is insufficient.



Slurry Infiltrated Fiber Reinforced Cementitious Composite (SIFRCC) is a fiber reinforced cement composite that improves brittleness of concrete and improves impact resistance and can have a fiber volume mixing rate of 4 % and more. It can confirm excellent impact resistance with compressive strength of 80 MPa or more and flexural strength of 50% or more. In addition, it is believed that it can be an alternative to improving the physical protection performance of existing structures because internal reinforcement construction of structures is possible.



In order to improve the slurry filling performance between the steel fibers, SIFRCC was fabricated by dispersing the steel fibers on mold and then fill the high-performance slurry (Fig. 1). Fine aggregate with particle size of 0.5 mm or less were used KS standard fine aggregate to improve the filling performance of slurry. Furthermore, to reduce the material cost of SIFRCC, this study analyzed the fluidity and flexural strength characteristics of SIFRCC when it was replaced with dry sand of 0.5 mm or less, which is 60% cheaper than KS standard fine aggregate.



As a result of the consistency test, it was confirmed that the target consistency for securing the filling performance of SIFRCC in all variables was less than 20 seconds. As a result of the flexural strength test (Fig. 3, Fig. 4), when dry sand was used as a substitute for KS standard fine aggregate, the flexural strength decreased by about 2 MPa but the flexural strength of 44 MPa or more could be maintain, so it is determined that the flexural strength and toughness of SIFRCC did not have a significantly effect. It is believed that additional experiments will be needed in terms of mechanical characteristics, durability characteristics, and construction performance for the replacement use of dry sand, which is 60% cheaper than KS standard fine aggregate.

With the recent advancement of technology, strategic weapons and forms of terrorism that can cause great damage to human life and infrastructure are evolving. Concrete is generally a brittle material, and general concrete structures do not have sufficient resistance to sudden extreme loads such as collisions and explosions. As a result, additional human casualties may occur due to the collapse of structures and fragments caused by brittle fractures. Research to improve the disadvantages of concrete under such extreme loads and improve the impact resistance performance is actively in progress. However, research to improve the physical protection performance of existing structures is insufficient.



Slurry Infiltrated Fiber Reinforced Cementitious Composite (SIFRCC) is a fiber reinforced cement composite that improves brittleness of concrete and improves impact resistance and can have a fiber volume mixing rate of 4 % and more. It can confirm excellent impact resistance with compressive strength of 80 MPa or more and flexural strength of 50% or more. In addition, it is believed that it can be an alternative to improving the physical protection performance of existing structures because internal reinforcement construction of structures is possible.



In order to improve the slurry filling performance between the steel fibers, SIFRCC was fabricated by dispersing the steel fibers on mold and then fill the high-performance slurry (Fig. 1). Fine aggregate with particle size of 0.5 mm or less were used KS standard fine aggregate to improve the filling performance of slurry. Furthermore, to reduce the material cost of SIFRCC, this study analyzed the fluidity and flexural strength characteristics of SIFRCC when it was replaced with dry sand of 0.5 mm or less, which is 60% cheaper than KS standard fine aggregate.



As a result of the consistency test, it was confirmed that the target consistency for securing the filling performance of SIFRCC in all variables was less than 20 seconds. As a result of the flexural strength test (Fig. 3, Fig. 4), when dry sand was used as a substitute for KS standard fine aggregate, the flexural strength decreased by about 2 MPa but the flexural strength of 44 MPa or more could be maintain, so it is determined that the flexural strength and toughness of SIFRCC did not have a significantly effect. It is believed that additional experiments will be needed in terms of mechanical characteristics, durability characteristics, and construction performance for the replacement use of dry sand, which is 60% cheaper than KS standard fine aggregate.