Master student from UiT did part of his work at Nordland Betong in Fauske

Master student Richard-Mathias Klausen chose a thesis focused on the impact of aggregate type on fibre concrete performance.

Despite fibre concrete being predominantly used for industrial floors, regulation for structural concrete with fibers NB38 publication from Norwegian concrete association is gradually being implemented. Therefore, it was proposed by Richard´s supervisor Iveta Novakova to cast test concrete in 3 different concrete plants located in Northern Norway, and UiT The Arctic University of Norway cooperates in Circulus or other projects, within the DeTeaA research group.

The first casting took place at Nordland Betong concrete plant in Fauske with the assistance of Tor Magne Johansen and Tor-Arne Rørvik. The concrete designed for testing was low-carbon concrete with a modified grading curve to achieve sufficient fibre distribution. Furthermore, the designed concrete is based on previously tested mix B45MF40, with air entrainment. During the mixing, a test mixture was first made of concrete in which no fibre and 4-8 mm fraction had been added. The purpose was mainly to check consistency and eventual pump ability potential. The proportion of aggregates and dose of superplasticizer was adjusted for the second mix, where steel fibres of size 50 mm/0.75 mm were added. Mix turned out well, matched the requested workability and looked pumpable. Samples for compressive strength, residual flexural tensile strength (CMOD) and E-modulus were cast and covered with plastic. Samples were stored in warm storage until further transportation to UiT where all the testing will be carried out.

The first casting was successful, and an experienced concrete truck driver, Roy Troskog, approved the test mix.

Mixer and roller conveyor with stone aggregate.
Slump measurement of mix before change and added fiber.
Type of fibre and fiber dosage maschine.
Fibers are poured into the drum of the concrete car were the fibres are mixed.
Result: 15 CMOD beams, 3 cylinders E-modul and 6 cubes.