Title of article :
Different aggressive media influence related to selected characteristics of concrete composites investigation
Author/Authors :
Ondrejka Harbulakova، Vlasta نويسنده Institute of Environmental Engineering , , Estokova، Adriana نويسنده Institute of Environmental Engineering , , Stevulova، Nadezda نويسنده Institute of Environmental Engineering , , Luptakova، Alena نويسنده Institute of Geotechnics ,
Abstract :
The loss of mass of concrete matrix and subsequent
corrosion of concrete has been reported very often.
Aggressive liquids such acids, bases, solutions of salts or
aggressive gases as well as microorganisms penetrate the
concrete and cause deterioration and biodeterioration,
respectively. Presented paper is aimed at investigation of
concrete corrosion (chemical as well as biologically
induced) activated by influence of different aggressive
media. Concrete cylinder samples of a 32 mm diameter
and 15 mm height were formed as a drilled core from
prepared concrete cubes. Concrete samples were exposed
to different aggressive media under laboratory conditions
(acid mine drainage, cultivation media for different bacteria
species, sulphuric acid, aluminium sulphate) as well
as in situ (waste water of sewage system in Kosice city) for
3 months. Influence of aggressive media and sulphur-oxidising
and sulphate-reducing bacteria on concrete samples
has been determined in terms of weight and surface
changes of investigated concrete samples and leaching of
the selected ions. The weight changes varied in the range
0.04–3.7 %. The visual changes of samples surface were
observed. Content of Ca, Si and Fe ions in leachates were
measured by X-ray fluorescence methods. Higher percentage
of calcium ions released has been measured comparing
to silicon ions in all media except for distilled water.
The results of elements releasing correspond to results of
weight changes of investigated concrete samples.
Journal title :
Astroparticle Physics
