Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties
Modern methods of designing and testing concrete must be extended to appropriate material engineering approaches. It is then crucial to link the properties of concrete with its structure described in a quantitative way. The aim of the article was to present the results of research on concretes modif...
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doaj-dd29ef626d2e4dea93d60120606ba0172020-11-24T22:15:15ZengMDPI AGBuildings2075-53092019-07-019817410.3390/buildings9080174buildings9080174Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic PropertiesJanusz Konkol0Department of Materials Engineering and Technology of Building, Rzeszow University of Technology, PL-35959 Rzeszow, PolandModern methods of designing and testing concrete must be extended to appropriate material engineering approaches. It is then crucial to link the properties of concrete with its structure described in a quantitative way. The aim of the article was to present the results of research on concretes modified with three additives: Silica fume (SF), activated fluidal ash (FA), and metakaolinite (MK). The concretes were tested for compressive strength, fracture toughness (determining critical stress intensity factor <i>K<sub>Ic</sub><sup>S</sup></i> and elastic modulus <i>E</i>). Also, stereological and fractal tests were performed. The research program covered three separate experiment plans, adopting the water/binder ratio and the additive/binder mass ratio as the independent variables. The results of experiments and their analysis proved a statistically significant relationship between fracture morphology (fractal dimension <i>D</i>) and concrete composition and fracture toughness. A higher fractal dimension was found in concretes with a higher content of cement paste and a lower content of additive. No significant effect of the type of additive used in the above dependence was found. An original method enabling the determination of mechanical properties of concrete with no need for destructive testing has been developed.https://www.mdpi.com/2075-5309/9/8/174fracture toughnessfractal dimensionstereologyconcretepozzolanic additivessilica fumeactivated fluidal ashmetakaolinite |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Janusz Konkol |
spellingShingle |
Janusz Konkol Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties Buildings fracture toughness fractal dimension stereology concrete pozzolanic additives silica fume activated fluidal ash metakaolinite |
author_facet |
Janusz Konkol |
author_sort |
Janusz Konkol |
title |
Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties |
title_short |
Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties |
title_full |
Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties |
title_fullStr |
Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties |
title_full_unstemmed |
Fracture Toughness and Fracture Surface Morphology of Concretes Modified with Selected Additives of Pozzolanic Properties |
title_sort |
fracture toughness and fracture surface morphology of concretes modified with selected additives of pozzolanic properties |
publisher |
MDPI AG |
series |
Buildings |
issn |
2075-5309 |
publishDate |
2019-07-01 |
description |
Modern methods of designing and testing concrete must be extended to appropriate material engineering approaches. It is then crucial to link the properties of concrete with its structure described in a quantitative way. The aim of the article was to present the results of research on concretes modified with three additives: Silica fume (SF), activated fluidal ash (FA), and metakaolinite (MK). The concretes were tested for compressive strength, fracture toughness (determining critical stress intensity factor <i>K<sub>Ic</sub><sup>S</sup></i> and elastic modulus <i>E</i>). Also, stereological and fractal tests were performed. The research program covered three separate experiment plans, adopting the water/binder ratio and the additive/binder mass ratio as the independent variables. The results of experiments and their analysis proved a statistically significant relationship between fracture morphology (fractal dimension <i>D</i>) and concrete composition and fracture toughness. A higher fractal dimension was found in concretes with a higher content of cement paste and a lower content of additive. No significant effect of the type of additive used in the above dependence was found. An original method enabling the determination of mechanical properties of concrete with no need for destructive testing has been developed. |
topic |
fracture toughness fractal dimension stereology concrete pozzolanic additives silica fume activated fluidal ash metakaolinite |
url |
https://www.mdpi.com/2075-5309/9/8/174 |
work_keys_str_mv |
AT januszkonkol fracturetoughnessandfracturesurfacemorphologyofconcretesmodifiedwithselectedadditivesofpozzolanicproperties |
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