Exploitation Of The Solid Waste Of Porfiritis In
Pozzolanic Cements
Author(s)
G. Batis, P. Pantazopoulou & O. Stavropoulou
Abstract
The objective of this paper is to investigate the possibility of introducing a
natural pozzolan named porfiritis, a natural waste product from the gold mines
located in N.E. Chalkidiki Greece, as a supplementary cementing material.
Blended cement was produced by replacing PC with 20% w/w porfiritis for the
evaluation of the pozzolanic cement properties. Reinforced mortar specimens
were either partially immersed in 3.5% w/w NaCl solution or exposed to
atmospheric conditions, for a period of 6 months. The experimental methods
used were: corrosion potential, corrosion rate by the Linear Polarization method,
mass loss, carbonation depth and compressive strength. Based on the results of
this study, it is concluded that the use of the porfiritic deposit as a blended
cement constituent improves the corrosion behaviour of the mortar specimens,
while no serious detrimental effect on the mechanical behaviour of the concrete
is detected.
Keywords: porfiritis, pozzolanic cements, chlorides corrosion, carbonation.
1 Introduction
The blended cement industry is a relatively new and rapidly growing field. The
literature on blended cements is extensive, as measurements at laboratory and
pilot-plant scale have been carried out over a period of about 50 years. Blended
cements provide specific technical advantages in comparison with ordinary
Portland cement, with regard to durability in various corrosion environments.
One of the most common materials classified as cementitious is natural
pozzolans, natural material containing silica in a reactive form [1–3].
Keywords
porfiritis, pozzolanic cements, chlorides corrosion, carbonation.
Related Book
Other papers in this volume
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