Road pavements are those structural elements subjected to loads deriving from the vehicles movement. Amongst the different kinds of pavements normally used to withstand such loads, rigid elements are supposed to be the most suitable for those conditions where severe stresses are supposed to be experienced. They are made of concrete and are designed in order to fulfil the following requirements: Guarantee a regular and poorly deformable rolling surface for vehicles; Distribute the vehicles loads among the different areas of the ground, thus avoiding undesired deformations; Save the ground underneath the upper layer from environmental actions. This paper deals with some special aspects of rigid pavements: in particular, fibre reinforced concrete elements have been tested at the Laboratory of Roads Construction of the University of Basilicata, analysing their behaviour in different situations: in particular, only the aspect connected with the impact resistance will be mentioned at this stage, the performances of different pavements reinforced with various kinds of fibres (metallic and synthetic) being therefore highlighted. Impact resistance tests were performed both at 7 and 28 days, so that all the aspects connected with the rupture of the element (first crack, number and width of cracks at different stages) were perfectly studied. Moreover, some Impact Resistance Indices were defined, in order to correctly characterise the elements during the three following stages of cracking: initial, intermediate and final, corresponding to collapse. The laboratory experiments drove to significant consideration on fibre reinforced concrete pavements, allowing the writers to make a clear comparison amongst the different kind of fibres used: indeed, the behaviour of pavements changed with composition (steel or polymer modified), dimensions (length and aspect ratio) and dosage of fibres, demonstrating that, nowadays, there is no kind of fibre that can guarantee a better behaviour in every circumstances.
Assessment of the impact resistance in concrete pavements reinforced with various kind of fibres: a comparison between common steel fibres and new polymer modified fibres
AGOSTINACCHIO, Michele;
2004-01-01
Abstract
Road pavements are those structural elements subjected to loads deriving from the vehicles movement. Amongst the different kinds of pavements normally used to withstand such loads, rigid elements are supposed to be the most suitable for those conditions where severe stresses are supposed to be experienced. They are made of concrete and are designed in order to fulfil the following requirements: Guarantee a regular and poorly deformable rolling surface for vehicles; Distribute the vehicles loads among the different areas of the ground, thus avoiding undesired deformations; Save the ground underneath the upper layer from environmental actions. This paper deals with some special aspects of rigid pavements: in particular, fibre reinforced concrete elements have been tested at the Laboratory of Roads Construction of the University of Basilicata, analysing their behaviour in different situations: in particular, only the aspect connected with the impact resistance will be mentioned at this stage, the performances of different pavements reinforced with various kinds of fibres (metallic and synthetic) being therefore highlighted. Impact resistance tests were performed both at 7 and 28 days, so that all the aspects connected with the rupture of the element (first crack, number and width of cracks at different stages) were perfectly studied. Moreover, some Impact Resistance Indices were defined, in order to correctly characterise the elements during the three following stages of cracking: initial, intermediate and final, corresponding to collapse. The laboratory experiments drove to significant consideration on fibre reinforced concrete pavements, allowing the writers to make a clear comparison amongst the different kind of fibres used: indeed, the behaviour of pavements changed with composition (steel or polymer modified), dimensions (length and aspect ratio) and dosage of fibres, demonstrating that, nowadays, there is no kind of fibre that can guarantee a better behaviour in every circumstances.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
