Effects of Water-Binder Ratio and Aggregate Shape on Crack Evolution in Cement-Based Materials: Inclined Shear Test and DEM Simulation
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 10
Abstract
In this study, inclined shear tests (ISTs) coupled with acoustic emission (AE) monitoring and discrete element method (DEM) numerical simulations were employed to investigate the influence of the water/binder (w/b) ratio ( and 0.23) and aggregate shape (rounded and angular) on the macro- and microfracture behavior of cement-based materials subjected to shear stress. The experimental results show that macrofracture parameters such as shear strength and stiffness increase as the w/b ratio decreases; however, they are not affected by aggregate shape, in agreement with simulations. The aggregate shape is related to the microcrack behavior. The microcrack distribution in the cement-angular aggregate mixture is confined to the area of the central shear zone, with much lower scatter than that in the cement-rounded aggregate mixture, in which microcracks are scattered around the central shear zone, in line with the macrocrack behavior. This finding is consistent with the numerical simulation results. The DEM simulation results show that the w/b ratio affects macroparameters, namely, Young’s modulus (E) and Poisson’s ratio (). The value of E increases as the w/b ratio is reduced and vice versa. The aggregate shape affects only the microparameters (bond properties), which are higher for angular aggregates than rounded aggregates. A method of determination of the DEM input parameters (both micro- and macroparameters) considering different w/b ratios and aggregate shapes was proposed as well.
Practical Applications
This work provides insights into both the macro and microfracture behavior of cement mortar from the viewpoint of both tests and the relatively new DEM modeling technique. Verified with the IST data, which is rarely found in existing literature, there is generally good agreement between the simulations and tests. Moreover, a unique way of modeling, especially angular aggregate shape has been demonstrated. Further, some reference bond properties and a way to estimate them have been provided for similar simulations. The application of the model presented in this study may be extended to evaluate the strength of rock and assess its suitability as a potentially effective nuclear waste repository site or even evaluate the strength of confined concrete columns (structures) in future studies. These interesting ideas have been presented, for example, because due to the interlocking nature of angular aggregates, the bond properties of cement-based materials made of angular aggregates were found to be higher than those of their rounded aggregate counterparts.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
References
Aïtcin, P. C. 2016. “The importance of the water-cement and water-binder ratios.” Sci. Technol. Concr. Admixtures 3–13. https://doi.org/10.1016/b978-0-08-100693-1.00001-1.
Brown, N. J. 2013. Discrete element modelling of cementitious materials the university of Edinburgh. Edinburgh, UK: Univ. of Edinburgh.
Chen, B., and J. Liu. 2004. “Effect of aggregate on the fracture behavior of high strength concrete.” Constr. Build. Mater. 18 (8): 585–590. https://doi.org/10.1016/j.conbuildmat.2004.04.013.
Chen, L. H. 2001. “Failure of rock under normal wedge indentation.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Minnesota.
Chen, W. C., L. H. Chen, and Y. C. Chen. 2018. “Using a novel shear apparatus coupled with acoustic emission to investigate shear fracture evolution of cement-based materials in macro- and micro-views.” Constr. Build. Mater. 187 (Oct): 665–673. https://doi.org/10.1016/j.conbuildmat.2018.07.144.
Czuryszkiewicz, A. 1973. “The effect of aggregate shape upon the strength of structural lightweight-aggregate concrete.” Mag. Concr. Res. 25 (83): 81–86. https://doi.org/10.1680/macr.1973.25.83.81.
Fakhimi, A., and B. Hemami. 2017. “Rock uniaxial compression test and axial splitting.” Procedia Eng. 191 (Jan): 623–630. https://doi.org/10.1016/j.proeng.2017.05.226.
Forti, T., G. Batistela, N. Forti, and N. Vianna. 2020. “3D mesoscale finite element modelling of concrete under uniaxial loadings.” Materials 13 (20): 4585. https://doi.org/10.3390/ma13204585.
Hu, H. T., F. M. Lin, and Y. Y. Jan. 2004. “Nonlinear finite element analysis of reinforced concrete beams strengthened by fiber-reinforced plastics.” Compos. Struct. 63 (3–4): 271–281. https://doi.org/10.1016/S0263-8223(03)00174-0.
Jiang, S., and L. Shen. 2022. “Aggregate shape effect on fracture and breakage of cementitious granular materials.” Int. J. Mech. Sci. 220 (Apr): 107161. https://doi.org/10.1016/j.ijmecsci.2022.107161.
Kang, M., and L. Weibin. 2018. “Effect of the aggregate size on strength properties of recycled aggregate concrete.” Adv. Mater. Sci. Eng. 2018 (Jan): 2428576. https://doi.org/10.1155/2018/2428576.
Lajtai, E. Z. 1969. “Mechanics of second order faults and tension gashes.” Geol. Soc. Am. Bull. 80 (11): 2253–2272. https://doi.org/10.1130/0016-7606(1969)80[2253:MOSOFA]2.0.CO;2.
Ma, Y., and H. Huang. 2021. “Effect of shear bond failure on the strength ratio in DEM modeling of quasi-brittle materials.” Acta Geotech. 16 (8): 2629–2642. https://doi.org/10.1007/s11440-021-01220-x.
Mackie, R. I. 2015. “Finite element modelling of structural concrete, by M.D Kotsovos: Review.” Comput. Struct. 160 (Nov): 40–41. https://doi.org/10.1016/j.compstruc.2015.07.004.
Miller, T. H., T. Potisuk, C. C. Higgins, and S. C. Yim. 2011. “Finite element analysis of reinforced concrete beams with corrosion subjected to shear.” Adv. Civ. Eng. 2011 (Jan): 706803. https://doi.org/10.1155/2011/706803.
Moharrami, M., and I. Koutromanos. 2017. “Finite element analysis of damage and failure of reinforced concrete members under earthquake loading.” Earthquake Eng. Struct. Dyn. 46 (15): 2811–2829. https://doi.org/10.1002/eqe.2932.
Neto, J. S. A., A. G. De la Torre, and A. P. Kirchheim. 2021. “Effects of sulfates on the hydration of portland cement—A review.” Constr. Build. Mater. 279 (Apr): 122428. https://doi.org/10.1016/j.conbuildmat.2021.122428.
Nguyen, N. H. T., H. H. Bui, G. D. Nguyen, J. Kodikara, S. Arooran, and P. Jitsangiam. 2017a. “Discrete element modelling of fracture in quasi-brittle materials.” In Proc., 24th Australasian Conf. Mechanics of Structures and Materials (ACMSM24), 329–336. Boca Raton, FL: CRC Press.
Nguyen, T. T., H. H. Bui, T. D. Ngo, and G. D. Nguyen. 2017b. “Discrete element modelling of the mechanical behaviour of a highly porous foamed concrete.” In Proc., Poromechanics VI: 6th Biot Conf. Poromechanics, 1380–1387. Reston, VA: ASCE.
Nitka, M., and J. Tejchman. 2020. “Meso-mechanical modelling of damage in concrete using discrete element method with porous ITZs of defined width around aggregates.” Eng. Fract. Mech. 231 (May): 107029. https://doi.org/10.1016/j.engfracmech.2020.107029.
Owayo, A. A., F. C. Teng, and W. C. Chen. 2021. “DEM simulation of crack evolution in cement-based materials under inclined shear test.” Constr. Build. Mater. 301 (Sep): 124087. https://doi.org/10.1016/j.conbuildmat.2021.124087.
Sinaie, S. 2017. “Application of the discrete element method for the simulation of size effects in concrete samples.” Int. J. Solids Struct. 108 (Mar): 244–253. https://doi.org/10.1016/j.ijsolstr.2016.12.022.
Wang, J., and M. Gutierrez. 2010. “Discrete element simulations of direct shear specimen scale effects.” Géotechnique 60 (5): 395–409. https://doi.org/10.1680/geot.2010.60.5.395.
Yang, K.-H., H.-Z. Hwang, and S. Lee. 2010a. “Effects of water-binder ratio and fine aggregate–total aggregate ratio on the properties of Hwangtoh-based alkali-activated concrete.” J. Mater. Civ. Eng. 22 (9): 887–896. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000091.
Yang, Y., X. Gao, H. Deng, P. Yu, and Y. Yao. 2010b. “Effects of water/binder ratio on the properties of engineered cementitious composites.” J. Wuhan Univ. Technol. Mater. Sci. Ed. 25 (2): 298–302. https://doi.org/10.1007/s11595-010-2298-7.
Zhu, Z., G. Tan, W. Zhang, and C. Wu. 2020. “Preliminary analysis of the ductility and crack-control ability of engineered cementitious composite with superfine sand and polypropylene fiber (SSPP-ECC).” Materials 13 (11): 2609. https://doi.org/10.3390/ma13112609.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 2, 2022
Accepted: Mar 15, 2023
Published online: Jul 24, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 24, 2023
ASCE Technical Topics:
- Aggregates
- Cement
- Concrete
- Continuum mechanics
- Cracking
- Discrete element method
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fracture mechanics
- Infrastructure
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Methodology (by type)
- Models (by type)
- Numerical methods
- Numerical models
- Pavements
- Shear stress
- Shear tests
- Solid mechanics
- Stress (by type)
- Structural analysis
- Structural engineering
- Tests (by type)
- Transportation engineering
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