Concrete Containing Thermoplastic Waste As
Aggregates – The Effect On The Rebars’ Corrosion
Author(s)
S. Gavela, A. Ntziouni, E. Rakanta, N. Kouloumbi,
& V. Kasselouri-Rigopoulou
Abstract
A lot of research has been performed on the utilization of waste products in
concrete because it is widely used and has a long service life, which means that
the waste is being removed from the waste stream for a long period. In the frame
of an extended research program dealing with the utilization of thermoplastic
waste, the effect on the reinforcement corrosion of concretes containing the
above polymers as aggregates has been studied. As the amount of aggregates
required in concrete is large, the environmental benefits are not only related to
the safe disposal of the waste, but also to the environmental impacts arising from
the extraction of aggregates, which include the visual intrusion and the loss of
countryside. Three series of reinforced concrete specimens were prepared, one
containing 12% by volume of aggregates high density polyethylene (HDPE), one
containing 12% by volume of aggregates polypropylene (PP) and one without
replacement of conventional aggregates. The specimens were cured in water for
7 days and then they were immersed in 3.5%wt NaCl solution. The following
measurements were carried out in order to investigate if the corrosion behavior
of the rebars is changed due to the replacement of the conventional aggregates by
the thermoplastics: Potential versus time evolution, Linear Polarization,
Electrochemical Impedance Spectroscopy, Carbonation Depth. Results showed
that the replacement of conventional aggregates by the two polymers studied
does not provoke rebars’ corrosion.
Keywords: concrete, thermoplastic waste, aggregates, reinforcement corrosion,
EIS, LPR.
Keywords
concrete, thermoplastic waste, aggregates, reinforcement corrosion,
EIS, LPR.
Related Book
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