Early shrinkage due to quick drying immediately after pouring is one of the most dangerous phenomenon influencing both performances and durability of concrete pavements in service. At the Laboratory of Roads Construction of the University of Basilicata-Potenza, this aspect was faced by simulating the conditions normally experienced after casting a concrete pavement in a severe environmental surrounding: high temperature and strong wind were indeed considered. Plain and fibre-reinforced concrete elements were tested, the results being therefore compared in order to assess the improvements of performances due to the addition of fibres to the paste. According to the kind of fibre (steel or polymer modified) and to the dosage adopted, different situations were found from the viewpoint of number and width of cracks and both weight and length variation of the elements. 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 type (steel or polymer modified), dimensions (length and aspect ratio) and dosage of fibres. The results explained that the longer the element, for steel fibres, and the higher the dosage, for polymer modified elements, the better the performances from the standpoint of plastic shrinkage damages.

Plastic shrinkage reduction in concrete pavements due to the addition of both steel and polymer modified fibers

AGOSTINACCHIO, Michele;
2004

Abstract

Early shrinkage due to quick drying immediately after pouring is one of the most dangerous phenomenon influencing both performances and durability of concrete pavements in service. At the Laboratory of Roads Construction of the University of Basilicata-Potenza, this aspect was faced by simulating the conditions normally experienced after casting a concrete pavement in a severe environmental surrounding: high temperature and strong wind were indeed considered. Plain and fibre-reinforced concrete elements were tested, the results being therefore compared in order to assess the improvements of performances due to the addition of fibres to the paste. According to the kind of fibre (steel or polymer modified) and to the dosage adopted, different situations were found from the viewpoint of number and width of cracks and both weight and length variation of the elements. 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 type (steel or polymer modified), dimensions (length and aspect ratio) and dosage of fibres. The results explained that the longer the element, for steel fibres, and the higher the dosage, for polymer modified elements, the better the performances from the standpoint of plastic shrinkage damages.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/1128
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