Abstract
This paper deals with the possibility of the improvement of pervious concrete properties by incorporation of different types of fibres and studies the effect of short duration vibration of pervious concrete properties in comparison with compaction with wooden lath and hammer. Ten mixtures of pervious concrete were prepared, five of which were compacted with wooden lath and hammer and five by short duration vibration. Density, porosity, permeability and mechanical properties were tested for in hardened pervious concrete specimens. It was concluded that mixtures compacted by short duration vibration had better mechanical properties due to the formation of a viscous layer at the contact surface between the aggregate grain and the cement matrix during the compaction, as well as pore-related properties. The addition of fibres negatively affected porosity and permeability but generally improved mechanical properties of concrete. The positive effect of fibre addition was more emphasised in cases of vibrated mixtures.
Highlights
This paper deals with the possibility of the improvement of pervious concrete properties by incorporation of different types of fibres and studies the effect of short duration vibration of pervious concrete properties in comparison with compaction with wooden lath and hammer
Pervious concrete is characterized by its ability to drain water through the concrete mass [5], its high noise absorption and its lighter color, which has a positive effect on reducing the occurrence of heat islands in urban areas [6]
The effect of incorporation of different types of fibres on the porosity and permeability according to both methods used here was evaluated by the ratio of the properties of the pervious concrete mixtures containing fibres and the reference pervious concrete mixtures, taking into consideration that in this case there are two reference mixtures: E mixture compacted with wooden lath and hammer and EV mixture compacted by short duration vibration
Summary
Ten mixtures of pervious concrete were prepared. Regarding the composition of mixtures, there were five different pervious concrete mixtures, each compacted using two different methods: [1] compaction with wooden lath and hammer and [2] vibration on vibrating table for 5 s. Four different types of fibres (Figure 3) – glass (G), polypropylene (PP), hemp (H) and carbon (C) fibres – were added to the mixtures. The pervious concrete mixture E had no fibres and it was compacted by 25 strokes with a wooden lath and hammer; this method was used for G, C, PP, and H. The designation of mixtures comes from the type of fibres contained in the specific mixture and the compaction method used; vibrated specimens contain the letter V in their designation
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