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...

Full description

Bibliographic Details
Main Author: Janusz Konkol
Format: Article
Language:English
Published: MDPI AG 2019-07-01
Series:Buildings
Subjects:
Online Access:https://www.mdpi.com/2075-5309/9/8/174
id doaj-dd29ef626d2e4dea93d60120606ba017
record_format Article
spelling 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
_version_ 1725795174586515456