Effect of short fibers orientation on mechanical properties of composite material – fiber reinforced concrete

Abstract

Traditional fiberconcrete structures have fibres in the mix oriented in all spatial directions, distributed in the structural element volume homogenously, what not easy to obtain in practice. In many situations, structurally more effective is the insertion of fibres into the concrete structural element body by forming layers, with a predetermined fibre concentration and orientation in every layer. In the present investigation, layered fibre concrete is under investigation. Short steel fibres were attached to flexible warps with the necessary fibres concentration and orientation. Warps were placed into the prismatic mould separating them by concrete layers without fibres. Prisms were matured and tested under four-point bending. The bending-affected mechanical behaviour of cracked fibre concrete was simulated numerically by using a developed structural model. Comparing the simulation results with experimental data, material micromechanical fracture mechanisms were analysed and evaluated.

Keywords:

• fiber reinforced concrete
• fibers orientation
• fibers pull-out
• oriented fiber distribution

Additional information

Notes on contributors

Vitalijs Lusis

Vitalijs LUSIS. Dr Sc. Ing. (PhD) in Mechanics received in 2015. He is Associate Professor at Riga Technical University. His research interests include fracture mechanics of fiber-reinforced concrete, durability of high performance concrete, innovation fiber-reinforced concrete technologies. V.Lusis is an author and co-author of 20 scientific publications and 9 patents for invention. Since 2011 he is member of Latvian Concrete Association and Latvian Materials Research Society.

Andrejs Krasnikovs

Andrejs KRASNIKOVS. Professor, Academic of the Latvian Academy of Sciences. Dr Sc. Ing. (PhD) in Mathematics and Physics received in 1986. Head of Concrete Mechanics Laboratory since 2000, professor since 2006. Visiting professor of Virginia Tech (US) (2000); visiting researcher of Lulea Tech (Sweden) (2002). Academic fields of interest: materials mechanics, composite materials, nano-materials, concretes, asphalts, experimental mechanics and numerical investigations. Author of more than 180 scientific publications and 25 invention patents. During the last five years, RTU contractor and tasks leader in three large international and more than ten regional scientific research projects.

Olga Kononova

Olga KONONOVA. Dr Sc. Ing. (PhD) in Mechanics received in 2005, RTU professor since 2012. Fields of interest; material mechanics, composite materials, concretes, experimental investigations and numerical modelling. Author of more than 100 scientific publications and 7 invention patents. Participant of four EU research projects and leader of seven domestic research projects.

Videvuds-Arijs Lapsa

Videvuds-Arijs LAPSA Dr Sc. Ing. (PhD). Assoc. professor Institute of Building production, Faculty of Civil Engineering, RTU. His research interests include fracture mechanics of fiber-reinforced concrete, durability of high performance concrete, extrusion technology, innovation fiber-reinforced concrete technologies. V-A. Lapsa is an author and co-author of 100 scientific publications, 100 patents for invention. He is member of Latvian Concrete Association and Latvian Materials Research Society.

Rimvydas Stonys

Rimvydas STONYS. Dr, Senior Researcher, Laboratory of Building Products Technology, Scientific Institute of Thermal Insulation of Vilnius Gediminas Technical University, Lithuania. Research interests: materials science, application of nanotechnologies in cementitious materials, refractory concretes and their application.

Arturs Macanovskis

Arturs MACANOVSKIS. Dr Sc. Ing. (PhD) in Mechanics received in 2014, Riga Technical University, Institute of Mechanics, A. Macanovskis is an author and co-author of 20 scientific publications, 3 patents of invention. Takes active part in various scientific conferences (over 20 presentations) associated with composite materials. Has been studying fiber-reinforced concrete structure with various fibers types (metal, polymer, etc.).

Arturs Lukasenoks

Arturs LUKASENOKS. PhD student, Faculty of Civil engineering, Concrete Mechanics Laboratory, RTU. A. Lukasenoks is an author and co-author of 5 scientific publications. Has been studying fiberconcrete structure with various fibers types.