Baris ARSLAN, Hasan Selim ŞENGEL, Mehmet CANBAZ

5225

MICRO-SCALE AIR VOID STRUCTURES IN CONCRETE AND THEIR EFFECT ON FAILURE BEHAVIOR

Tomography images and image processing methods are extensively employed by researchers to investigate the micro-dimensional air voids that are formed in the internal structure of concrete.  Finite element method-based fracture analysis is required to investigate the effect of the mechanical behavior of concrete and micro-dimensional crack development; micro-dimensional voids cannot be experimentally observed because of their small scale.  Although concrete that is exposed to uniaxial compression remains in the elastic region, realistic brittle failure can be achieved using the damage plasticity model, which considers the effect of tension cracks that form around micro air voids, which in turn enhance cracking development and the compressive strength of concrete. Within the scope of this study, concrete cubes with a side dimension of 15 cm were prepared. Three groups of these cubes are composed; each group contains three specimens. The first group contains additive-free control specimens and the remaining two groups contain specimens that are mixed with two different ratios of air-entraining admixtures. After the concrete specimens were created,  core samples were prepared and scanned with micro computed tomography.  These 2D and high-resolution images are modeled using the image processing software Simpleware and exported to the FEM-based analysis software Abaqus.  The volume, void ratio and mass properties of fresh and hardened concrete, which are experimentally obtained, are compared with the physical properties of 3D-modeled specimens.  Based on the mass and volume analyses, these 3D models, which have micro-dimensional air voids that are assigned with the parametrized CDP material properties were simulated, and a uniaxial compression tests and fracture analysis were performed.  According to the analysis results, the relations between crack development and quantity and the distribution of entrained air were discussed.
Keywords:

concrete micro air voids, μCT image processing, FEM,

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  • [1] Grolier Online Atlas, (n.d.). http://go.grolier.com/atlas?id=mtlr094 (accessed February 25, 2015).
  • [2] Ç. Ozyildirim, Hava Sürükleyici Katkilarin Beton Dayanikliliğindaki Yeri, E-Kutuphane.imo.org.tr. (2007). http://www.e-kutuphane.imo.org.tr/pdf/3978.pdf (accessed October 10, 2013).
  • [3] ASTM, C138-Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete, in: B. Stand., n.d.
  • [4] ASTM, C173-Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method, in: n.d.
  • [5] ASTM, C231-Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method, in: n.d.
  • [6] ASTM, C457-Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete, (1998).
  • [7] B. Arslan, M. Canbaz, H.S. Sengel, The Determination of the Air Entrained Distribution in Concrete using Micro-CT and Microscopic Techniques Experimental Studies, (2013) 1–10.
  • [8] I.T. Young, J.J.. Gerbrands, L.J. van Vliet, Fundamentals of Image Processing, in: n.d. doi:10.1002/9783527635245.ch4.
  • [9] R.C. Gonzalez, R.E. Woods, Digital Image Processing, 3rd Editio, Upper Saddle River, N.J. : Prentice Hall, ©2008., 2008. doi:10.1049/ep.1978.0474.
  • [10] H.B. Kupfer, K.H. Gerstle, Behavior of concrete under biaxial stresses, J. Eng. Mech. Div. 99 (1969) 656–666.
  • [11] M.D.N. Kotsovos, Behaviour of concrete under multiaxial stress, Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 15 (1978). http://www.sciencedirect.com/science/article/pii/0148906278912172 (accessed October 9, 2013).
  • [12] M. Ortiz, A constitutive theory for the inelastic behavior of concrete, Mech. Mater. (1985). http://www.sciencedirect.com/science/article/pii/0167663685900079 (accessed February 18, 2014).
  • [13] J. Lubliner, J. Oliver, S. Oller, E. Oñate, A plastic-damage model for concrete, Int. J. Solids Struct. 25 (1989) 299–326. http://www.sciencedirect.com/science/article/pii/0020768389900504 (accessed October 2, 2013).
  • [14] A.C.T. Chen, W.F. Chen, Constitutive Relations for Concrete, J. Eng. Mech. Div. 101 (1975) 465–481. http://cedb.asce.org/cgi/WWWdisplay.cgi?6163 (accessed October 24, 2013).
  • [15] S. Yazdani, H. Schreyer, Combined plasticity and damage mechanics model for plain concrete, J. Eng. Mech. 116 (1990) 1435–1450. http://ascelibrary.org/doi/abs/10.1061/(ASCE)0733-9399(1990)116:7(1435) (accessed October 24, 2013).
  • [16] T. Abu-Lebdeh, G. Voyiadjis, Plasticity-damage model for concrete under cyclic multiaxial loading, J. Eng. Mech. 119 (1993) 1465–1484. http://ascelibrary.org/doi/abs/10.1061/(ASCE)0733-9399(1993)119:7(1465) (accessed October 24, 2013).
  • [17] J. Lee, G. Fenves, Plastic-damage model for cyclic loading of concrete structures, J. Eng. Mech. 124 (1998) 892–900. doi:10.1061/(ASCE)0733-9399(1998)124:8(892).
  • [18] T. Jankowiak, T. Lodygowski, Identification of parameters of concrete damage plasticity constitutive model, Found. Civ. Environ. …. (2005). http://www.ikb.poznan.pl/fcee/2005.06/full/fcee_2005-06_053-069_identification_of_parameters_of_concrete.pdf (accessed October 2, 2013).
  • [19] J.Y. Wu, J. Li, R. Faria, An energy release rate-based plastic-damage model for concrete, Int. J. Solids Struct. 43 (2006) 583–612. doi:10.1016/j.ijsolstr.2005.05.038.
  • [20] L. Jason, A. Huerta, G. Pijaudier-Cabot, S. Ghavamian, An elastic plastic damage formulation for concrete: Application to elementary tests and comparison with an isotropic damage model, Comput. Methods Appl. Mech. Eng. 195 (2006) 7077–7092. doi:10.1016/j.cma.2005.04.017.
  • [21] Z. Taqieddin, Elasto-plastic and damage modeling of reinforced concrete, (2008). http://etd.lsu.edu/docs/available/etd-06242008-205101/ (accessed October 1, 2013).
  • [22] 3D image processing software from Simpleware, (n.d.). http://www.simpleware.com/software/scanip/ (accessed February 8, 2015).
  • [23] Abaqus/CAE - Dassault Systèmes, (n.d.). http://www.3ds.com/products-services/simulia/products/abaqus/abaquscae/ (accessed February 8, 2015).
  • [24] Abaqus 6.13 Analysis User’s Guide, Abaqus 6.13 Analysis User’s Guide Volume III: Materials, Section 23.6.3, Inelastic Mechanical Properties, Concrete, “Concrete damaged plasticity,” n.d.
  • [25] ASTM, C143-Standard Test Method for Slump of Hydraulic-Cement Concrete.pdf, (n.d.).
  • [26] E. Pramono, K. Willam, Implicit integration of composite yield surfaces with corners, Eng. Comput. 6 (1989) 186–197. doi:10.1108/eb023774.
  • [27] L.M. Kachanov, Time of the rupture process under creep conditions, Izv Akad Nauk S S R Otd Tech Nauk. 8 (1958) 26–31. http://scholar.google.com/scholar?hl=en&btnG=Search&q=intitle:Time+of+the+rupture+process+under+creep+conditions#0.
  • [28] C. W.F., Plasticity in reinforced concrete, Comput. Methods Appl. Mech. Eng. 31 (1982). http://www.sciencedirect.com/science/article/pii/0045782582900160 (accessed October 10, 2013).
  • [29] P.-E. Petersson, Crack growth and development of fractrue zones in plain concrete and similar materials, University of Lund, Lund, Sweden., 1981.
  • [30] B.G. Rabbat, H.G. Russell, Friction Coefficient of Steel on Concrete or Grout, J. Struct. Eng. 111 (1985) 505–515. doi:10.1061/(ASCE)0733-9445(1985)111:3(505).
Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering-Cover
  • ISSN: 2667-4211
  • Yayın Aralığı: Yılda 4 Sayı
  • Başlangıç: 2000
  • Yayıncı: Eskişehir Teknik Üniversitesi
Arşiv
Sayıdaki Diğer Makaleler

Özlem ÇAVUŞ

Feyza KAZANÇ ÖZERİNÇ

Efnan ŞORA GÜNAL

Yenal KARAASLAN, Haluk YAPICIOĞLU, Cem SEVİK

Nilgün Lütfiye SAYIL

Seval AKSOY

Oğuzhan Ahmet ARIK

Nurettin BAĞIRMAZ

Mahzad AZİMA, Zeynep BAŞARAN BUNDUR

Murat SERT