Publication detail
Identification of Mechanical Fracture Parameters of Alkali-Activated Slag Based Composites During Specimens Ageing
ŠIMONOVÁ, H. KUCHARCZYKOVÁ, B. LIPOWCZAN, M. LEHKÝ, D. BÍLEK, V. KOCÁB, D.
Original Title
Identification of Mechanical Fracture Parameters of Alkali-Activated Slag Based Composites During Specimens Ageing
Type
abstract
Language
English
Original Abstract
The aim of the paper is to present the results of the experiment focused on the development of the mechanical fracture characteristics of alkali-activated slag (AAS) based composites within the time interval from 3 days to 2 years of ageing. Two AAS composites, which differed only in the presence of shrinkage reducing admixture (SRA), were prepared for the purpose of experiments. The composites were prepared using ground granulated blast furnace slag activated by water-glass with silicate modulus of 2.0, standardized quartzite sand with the particle grain size distribution of 0−2 mm, and water. Commercially produced SRA was added into second mixture in amount of 2 % by weight of slag. The test specimens were not protected from drying during the whole time interval and were stored in laboratory at ambient temperature of 21 ± 2 °C and relative humidity of 60 ± 10 %. The prism specimens made of above mentioned composites with nominal dimensions of 40 × 40 × 160 mm and the initial central edge notch were subjected to the fracture tests in three-point bending configuration. The load F and displacement d (deflection in the middle of the span length) were continuosly recorded during the fracture tests. The obtained F−d diagrams and specimen dimensions were used as input data for identification of parameters via the inverse analysis based on the artificial neural network, which aim is to transfer the fracture test response data to the desired material parameters. In this paper, the modulus of elasticity, tensile strength and fracture energy values were identified and subsequently compared with values obtained based on the fracture test evaluation using the effective crack model and work-of-fracture method.
Keywords
Fracture test, Inverse analysis, Artificial neural network, Effective crack model, Work-of-fracture method, Slag, Alkali activation
Authors
ŠIMONOVÁ, H.; KUCHARCZYKOVÁ, B.; LIPOWCZAN, M.; LEHKÝ, D.; BÍLEK, V.; KOCÁB, D.
Released
23. 5. 2019
Publisher
VŠB-TU Ostrava, Faculty of Civil Engineering
Location
Ostrava
ISBN
978-80-248-4296-7
Book
Proceedings of extended abstracts “Modelling in Mechanics 2019”
Pages from
30
Pages to
30
Pages count
1
BibTex
@misc{BUT157090,
author="Hana {Šimonová} and Barbara {Kucharczyková} and Martin {Lipowczan} and David {Lehký} and Vlastimil {Bílek} and Dalibor {Kocáb}",
title="Identification of Mechanical Fracture Parameters of Alkali-Activated Slag Based Composites During Specimens Ageing",
booktitle="Proceedings of extended abstracts “Modelling in Mechanics 2019”",
year="2019",
pages="30--30",
publisher="VŠB-TU Ostrava, Faculty of Civil Engineering",
address="Ostrava",
isbn="978-80-248-4296-7",
note="abstract"
}