Fracture Resistance of AAAS Composites with Ceramic Precursor

Abstract:

The paper deals with selected alkali-activated aluminosilicate (AAAS) composites based on ceramic precursors in terms of their characterization by mechanical fracture parameters. Composites made of brick dust as a precursor and an alkaline activator with a silicate modulus of M_s = 0.8, 1.0, 1.2, 1.4 and 1.6 were investigated. The filler employed with one set of composites was quartz sand, while for the other set it was crushed brick. The test specimens had nominal dimensions of 40 × 40 × 160 mm and were provided with notches at midspan of up to 1/3 of the height of the specimens after 28 days. 6 samples from each composite were tested. The specimens were subjected to three-point bending tests in which force vs. displacement (deflection at midspan) diagrams (F–d diagrams) and force vs. crack mouth opening (F–CMOD) diagrams were recorded. After the correction of these diagrams, static modulus of elasticity, effective fracture toughness, effective toughness and specific fracture energy values were determined using the Effective Crack Model and the Work-of-Fracture method. After the fracture experiments, informative compressive strength values were determined from one of the parts. All of the evaluations included the determination of arithmetic means and standard deviations. The silicate modulus values and type of filler of the AAAS composites significantly influenced their mechanical fracture parameters.

• Periodical: Solid State Phenomena (Volume 322)
• Pages: 54-59
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.322.54
• Online since: August 2021
• Authors: Iva Rozsypalová, Petr Daněk, Pavla Rovnaníková, Zbyněk Keršner*
• Keywords: Alkali-Activated Aluminosilicate, Ceramic Precursor, Fracture Test, Load–Displacement Diagram, Mechanical Fracture Parameters

References

[1] R. G. Gavali, A. Bras, P. Faria, R. V. Ralegaonkar, Development of sustainable alkali-activated bricks using industrial wastes. Construction and Building Materials, 275 (2019) 180–191.

DOI: 10.1016/j.conbuildmat.2019.04.152

[2] K. Komnitsas, D. Zaharaki, Geopolymerisation: A review and prospects for the minerals industry. Minerals Engineering, 20 (2007) 1261–1277.

DOI: 10.1016/j.mineng.2007.07.011

[3] J. Shekhovtsova, I. Zhernovsky, M. Kovtun, N. Kozhukhova, I. Zhernovskaya, E. Kearsley, Estimation of fly ash reactivity for use in alkali-activated cements – A step towards sustainable building material and waste utilization. Journal of Cleaner Production, 178 (2018) 22–33.

DOI: 10.1016/j.jclepro.2017.12.270

[4] N. K. Lee, H. K. Kim, L. S. Park, H. K. Lee, Alkali-activated, cementless, controlled low-strength materials (CLSM) utilizing industrial by-products. Construction and Building Materials, 49 (2013) 738–746.

DOI: 10.1016/j.conbuildmat.2013.09.002

[5] L. Reig, M. M. Tashima, M. V. Borrachero, J. Monzó, C. R. Cheeseman, J. Payá, Properties and microstructure of alkali-activated red clay brick waste. Construction and Building Materials, 43 (2013) 98–106.

DOI: 10.1016/j.conbuildmat.2013.01.031

[6] R. A. Robayo, A. Mulford, J. Munera, R. M. de Gutiérrez, Alternative cements based on alkali-activated red clay brick waste. Construction and Building Materials, 128 (2016) 163–169.

DOI: 10.1016/j.conbuildmat.2016.10.023

[7] M. Tuyan, Ö. Andiç-Çakir, K. Ramyar, Effect of alkali activator concentration and curing condition on strength and microstructure of waste clay brick powder-based geopolymer. Composites Part B, 135 (2018) 243–252.

DOI: 10.1016/j.compositesb.2017.10.013

[8] V. Veselý, Z. Keršner, I. Merta, Quasi-brittle behaviour of composites as a key to generalized understanding of material fracture. In: Procedia Engineering: Structural and Physical Aspects of Construction Engineering. Procedia Engineering. Netherlands: Elsevier, (2017) 126–133.

DOI: 10.1016/j.proeng.2017.05.317

[9] H. Šimonová, I. Kumpová, I. Rozsypalová, P. Bayer, P. Frantík, P. Rovnaníková, Z. Keršner, Fracture Parameters of Alkali-activated Aluminosilicate Composites with Ceramic Precursor. In: 26th Concrete Days. Solid State Phenomena. Switzerland: Trans Tech Publications Ltd, Switzerland, (2020) 73–79.

DOI: 10.4028/www.scientific.net/ssp.309.73

[10] B.L. Karihaloo, Fracture Mechanics and Structural Concrete. New York: Longman Scientific & Technical, (1995).

[11] RILEM Technical Committee 50-FMC, Determination of the fracture energy of mortar and concrete by means of three-point bend test on notched beams. Materials and Structures, 18(4) (1985) 285–290.

DOI: 10.1007/bf02472918