Assessment Of Hook End Steel Fibre As A Substitute Material In High Performance Concrete Beam

• Main Author: Manoharan, Jegathisan
• Format: Monograph
• Language: English
• Published: Universiti Sains Malaysia 2019
• Subjects: T Technology; TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.usm.my/58721/1/Assessment%20Of%20Hook%20End%20Steel%20Fibre%20As%20A%20Substitute%20Material%20In%20High%20Performance%20Concrete%20Beam.pdf; http://eprints.usm.my/58721/
• Institution: Universiti Sains Malaysia

A study was done to identify the optimum fibre content to achieve maximum flexural capacity of high performance concrete beam. Hook end steel fibre of diameter 0.75 mm and 60 mm length have been used. The proportion of steel fibre that have been used are 0%, 1%, 2% and 3% by mass, this is done by adding to concrete mixture. The targeted compressive strength of concrete is more than 70 MPa since it is high performance concrete. A total of four tests were conducted according to BS1881. The four tests conducted are flow table test, cube compression test, tensile splitting test and flexural test. From the flow test, as the steel fibre content increases the flow started to decrease. The flow result for 0%, 1%, 2% and 3% steel fibre are 654 mm, 605 mm, 584 mm and 556 mm respectively. The superplasticizer dose should be increased as steel fibre content increase to maintain the same flow. From the compressive test, the addition of steel fibre increases the compressive strength of high performance concrete. The optimum steel fibre of 2% able to achieve maximum compressive strength of 105.7 MPa (14.9% gain in compressive strength than control sample). Other than that, addition of steel fibre also improve the tensile strength of concrete. The optimum steel fibre of 2% able to achieve maximum tensile strength of 9.1 MPa (46.8% gain in tensile splitting strength than control sample). Four beams of 100 mm x 300 mm x 2000 mm size were casted for the four-point flexural test. The highest flexural strength that was obtained is 21.65 MPa which was achieved at 2% of steel fibre. Further increase of steel fibre more than 2% reduced the respective strength of high performance concrete. The stiffness of high performance concrete with steel fibre is high compared to control sample before failure.