wAbstract
@The investigated rock material belongs to the group of upper
cretaceous quader sandstones which are very important construction
stones in Poland and Germany. The mineral composition of the rocks
is relatively uniform - they are quartzose sandstones. The most
important feature is their good workability and comparatively
high weathering resistance. Still, regardless of the apparent
resemblance, the observations carried on buildings and monuments
show differences in weathering processes. The undertaken test
was an attempt to verify the proposed before rock classification,
performed on the basis of parameterization of porosimetric cumulative
intrusion volume curves. The aim of the experiment was the evaluation
of the sandstone petrography (including the structure, texture
and porosity of the rock) influence on the weathering process.
The modelling of accelerated weathering was conducted in Chamber
for Ageing Acceleration, where some weather circumstances were
simulated (insolation, rain and frost). As the result of the weathering
experiment it could be stated that the dominant mechanism of the
sandstones deterioration was granular disintegration and weight
loss as a consequence of sample destruction. The most important
factor influencing rock deterioration is rock texture, especially
the character of grain contacts. The effective porosity is a requisite
of potential for the stone to take in and hold water, and hence
of resistance to weathering. In case of silica-cemented sandstones,
the deciding criterion influencing weathering resistance is pore
structure. In case of sandstones with clay cement, the most important
is mineral composition of the rock.
Keywords: Accelerated weathering; Degradation; Pore area; Sandstone;
Weathering resistancex
Introduction
Pore structure as a factor determining weathering processes
Methods
Sandstone classification on the basis of porosimetric measurements
Accelerated weathering experiment
Porosity and the pore space properties
Sandstone degradation
Discussion
Conclusion
Open access
References