Evaluation of Three-Point Bending Fracture Tests of Selected Concrete: Mechanical Fracture Parameters

Abstract:

In this paper, authors focus attention on mechanical fracture parameters obtained from records of three-point bending fracture tests on concrete specimens with initial notch. Total eight sets of specimens were tested. Three specimens at the age of 28 days were tested in each set. Concrete was different in dosage of Portland cement CEM I 42.5 R and amount of used superplasticizer. The Effective Crack Model (ECM) was used to evaluate the load vs deflection diagrams to obtain modulus of elasticity and effective fracture toughness; specific fracture energy was determined using work-of-fracture method. Modulus of elasticity, tensile strength and fracture energy were also subject of identification via inverse analysis based on artificial neural network, which aim is to transfer the input data obtained from the fracture test to the desired material parameters.

• Periodical: Solid State Phenomena (Volume 259)
• Pages: 64-69
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.259.64
• Online since: May 2017
• Authors: Hana Šimonová*, Petr Daněk, David Lehký, Zbyněk Keršner, Lubos Pazdera
• Keywords: Concrete, Fracture Test, Identification, Three-Point Bending

References

[1] A. M. Nevile, Properties of Concrete, Pearson Education Limited, Harlow 2011, 846.

[2] H. Šimonová, I. Havlíková, P. Daněk, Z. Keršner, T. Vymazal, The Effect of a Superplasticizer Admixture on the Mechanical Fracture Parameters of Concrete, Mater. Tehnol., 49 (2015) 3, 417−421, doi: 10. 17222/mit. 2014. 114.

DOI: 10.17222/mit.2014.114

[3] H. Šimonová, L. Topolář, I. Havlíková, M. Matysík, P. Daněk, Z. Keršner, Evaluation of Three-point Bending Fracture Tests of Selected Concrete: Crack Initiation and Acoustic Emission Parameters, ibidem.

DOI: 10.4028/www.scientific.net/ssp.259.58

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

[5] D. Novák, D. Lehký, ANN inverse analysis based on stochastic small-sample training set simulation, Engineering Application of Artificial Intelligence, 19 (2006) 7, 731–740, doi: 10. 1016/j. engappai. 2006. 05. 003.

DOI: 10.1016/j.engappai.2006.05.003

[6] T. Komárková, M. Králíková, D. Kocáb, P. Misák P., T. Stavař, Comparison of Standardized Test Methods for Determining the Permeability of the Surface Layer of Concrete, Advanced Materials Research, 1122 (2015).

DOI: 10.4028/www.scientific.net/amr.1122.141

[7] T. Komárková, M. Králíková, P. Kovács, D. Kocáb, T. Stavař, Application of computed tomography in comparison with the standardized methods for determining the permeability of cement-composite structures, Mater. Tehnol., 49 (2015).

DOI: 10.17222/mit.2014.194

[8] RILEM TC-50 FMC (Recommendation): Determination of the fracture energy of mortar and concrete by means of three-point bend test on notched beams, Materials & Structures, 18 (1985), 285–290.

DOI: 10.1007/bf02472918

[9] V. Červenka, L. Jendele, J. Červenka, ATENA Program documentation – Part 1: Theory, Cervenka Consulting, Prague, (2015).

[10] D. Lehký, Z. Keršner, D. Novák, FraMePID-3PB software for material parameter identification using fracture tests and inverse analysis, Advances in Engineering Software, 72 (2014), 147–154, doi: 10. 1016/j. advengsoft. 2013. 10. 001.

DOI: 10.1016/j.advengsoft.2013.10.001

[11] R. Ince, K. E. Alyamac, Determination of fracture parameters of concrete based on water-cement ratio, Indian Journal of Engineering & Material Sciences, 15 (2008), 14–22.

[12] P. J. M. Monteiro, P. R. L Helene, S. H, Kang, Designing concrete mixtures for strength, elastic modulus and fracture energy, Materials and Structures, 26 (1993) 8, 443–452, doi: 10. 1007/BF02472804.

DOI: 10.1007/bf02472804