Mechanical fracture and microstructural parameters of alkali-activated materials with a ceramic precursor

• Autorzy: Lipowczan Martin , Rozsypalová Iva , Bayer Patrik , Daněk Petr , Lehký David , Rovnaníková Pavla , Keršner Zbyněk

Identyfikatory

DOI

10.17512/znb.2021.1.18

Warianty tytułu

PL

Pękanie mechaniczne i parametry mikrostrukturalne materiałów aktywowanych alkaliami z ceramicznym prekursorem

• Języki publikacji: EN

Abstrakty

EN

Four sets of alkali-activated aluminosilicate composites based on ceramic precursors were studied in terms of their characterization by mechanical fracture and microstructural parameters. Composites made with brick dust as a precursor and with alkaline activator variants of differing silicate modulus (Ms = 0.8, 1.0, 1.2, 1.4 and 1.6) were investigated. The filler used with first two sets of composites was quartz sand, while in the case of the other two sets it was brick rubble; precursor particle size range variants: 0÷1 mm and 0÷0.3 mm. The test specimens had nominal dimensions of 40 × 40 × 160 mm and were provided with notches at midspan after 28 days of hardening. The notches extended up to 1/3 of the height of the specimens, which were subjected to three-point bending tests in which force vs. displacement diagrams were recorded. Values were determined for the static modulus of elasticity, effective fracture toughness, effective toughness and specific fracture energy using the Effective Crack Model and the Work-of-Fracture method. At the same time, values were identified for the static modulus of elasticity, tensile strength and specific fracture energy using the inverse method based on a neural network ensemble. The measured and identi fied parameters are in very good agreement. The silicate modulus, type of filler and refinement of the pre cursor significantly influenced the mechanical fracture parameters of the composites. The microstructure of composites with a coarser precursor was also described.

PL

Przebadano cztery zestawy kompozytów glinokrzemianowych aktywowanych alkaliami na bazie prekursorów ceramicznych pod kątem ich charakterystyki, pękania mechanicznego i parametrów mikrostrukturalnych. Badano kompozyty wykonane z mączką ceglaną jako prekursorem oraz z odmianami aktywatorów alkalicznych o różnym module krzemianowym (Ms = 0,8, 1,0, 1,2, 1,4 i 1,6). Wypełniaczem stosowanym w przypadku dwóch pierwszych zestawów kompozytów był piasek kwarcowy, natomiast w przypadku dwóch pozostałych gruz ceglany. Warianty zakresu wielkości cząstek prekursora wynosiły: 0÷1 mm i 0÷0,3 mm. Próbki do badań miały wymiary nominalne 40 × 40 × 160 mm i po 28 dniach utwardzania były zaopatrzone w nacięcia w połowie rozpiętości. Karby sięgały do 1/3 wysokości próbek, które poddano testom zginania trójpunktowego, w których rejestrowano wykresy siła w funkcji przemieszczenia. Wartości statycznego modułu sprężystości, efektywnej odporności na kruche pękanie, efektywnej wiązkości i właściwej energii pękania wyznaczono za pomocą modelu efektywnego pękania i metody pracy z pękaniem. Jednocześnie określono wartości statycznego modułu sprężystości, wytrzymałości na rozciąganie i właściwej energii pękania metodą odwrotną opartą na zespole sieci neuronowej. Zmierzone i zidentyfikowane parametry są bardzo zgodne. Moduł krzemianowy, rodzaj wypełniacza oraz uszlachetnienie prekursora istotnie wpływały na parametry pękania mechanicznego kompozytów. Opisano również mikrostrukturę kompozytów z grubszym prekursorem.

Słowa kluczowe

EN

alkali activated aluminosilicate; artificial neural network; fracture test; load-displacement diagram; mechanical fracture parameters

PL

sztuczna sieć neuronowa; test pękania; wykres obciążenie-przemieszczenie; parametry pękania mechanicznego

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
• Rocznik: 2021
• Tom: Z. 27 (177)
• Strony: 118--140
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Lipowczan Martin

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

• https://orcid.org/0000-0003-1541-687X

autor

Rozsypalová Iva

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

• https://orcid.org/0000-0003-3109-3820

autor

Bayer Patrik

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

• https://orcid.org/0000-0001-7866-1085

autor

Daněk Petr

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

• https://orcid.org/0000-0001-8489-9452

autor

Lehký David

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

autor

Rovnaníková Pavla

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

• https://orcid.org/0000-0002-6732-788X

autor

Keršner Zbyněk

• Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic

• https://orcid.org/0000-0003-4724-6166

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