Experimental study of crack initiation and crack damage stress thresholds as critical parameters influencing the durability of natural porous stone


Grant No.:


Grant Agency:

Czech Science Foundation (GAČR)

Resolved in:

2013 - 2017

Principal investigator:

Prof. Mgr. Richard Prikryl, Dr., Charles University in Prague,


Ing. Lenka Zamrazilová, Academy of Fine Arts in Prague
Ing. Tomáš Lokajíček, CSc.,Institute of Geology AS CR, v. v. i.
Ing. Zuzana Weishauptová, DrSc., Institute of Rock Structure and Mechanics of the CAS


The durability of natural stone is assumed to be intimately related to pre-peak fracture process (crack initiation and damage), which can be derived from stress-strain behaviour during compression and/or tension. Compared to previous empirical evaluation (freeze-thaw cycles, salt crystallization, hydric dilation) of the durability of natural stone, in this new project this will be resolved through experimental rock mechanical tests employing acoustic emission monitoring. Testing will include rock fabric analyses prior and after the tests on porous rocks (sandstones, silicites, tuffites, bioclastic limestones) showing variable porosity (5-30 vol. %), pore size distribution, granulometry, degree of cementation, and physical properties. Prior to the rock mechanical tests, certain specimens will be artificially weathered and/or consolidated in order to evaluate effect of rock fabric modification on the mechanical properties. From the stress-strain curves, energetic parameters of deformational process will be derived as a key factor influencing the durability of natural stone.

ISVAV: (What is it?)

Project in The Research and Development and Innovation System of the Czech Republic (in Czech only)