A numerical method for estimating the elastic modulus of recycled concrete

Xinzhu Zhou; Jianjun Zheng; Ting Chen; Jian Zhang; Chuanyang Wang; Jiefeng Wu

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자료유형: 학술저널

저자정보: Xinzhu Zhou (Zhejiang University of Technology) Jianjun Zheng (Zhejiang University of Technology) Ting Chen (Zhejiang University of Technology) Jian Zhang (Zhejiang University of Technology) Chuanyang Wang (Zhejiang University of Technology) Jiefeng Wu (Zhejiang University of Technology)

저널정보: 한국계산역학회 Computers and Concrete, An International Journal Computers and Concrete, An International Journal Vol.23 No.3

발행연도: 2019.1

수록면: 161 - 170 (10page)

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연구배경

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This paper aims at presenting a numerical method for estimating the elastic modulus of recycled concrete with crushed aggregates. In the method, polygonal aggregates following a given sieve curve are generated, and placed into a square simulation element with the aid of the periodic boundary condition and the overlap criterion of two polygonal aggregates. The mesostructure of recycled concrete is reconstructed by embedding an old interfacial transition zone (ITZ) layer inside each recycled aggregate and by coating all the aggregates with a new ITZ layer. The square simulation element is discretized into a regular grid and a representative point is selected from each sub-element. The iterative method is combined with the fast Fourier transform to evaluate the elastic modulus of recycled concrete. After the validity of the numerical method is verified with experimental results, a sensitivity analysis is conducted to evaluate the effects of key factors on the elastic modulus of recycled concrete. Numerical results show that the elastic modulus of recycled concrete increases with the increase of the total aggregate content and the elastic moduli of old and new ITZ but decreases with increasing the replacement ratio of recycled aggregate and the thicknesses of old and new ITZ. It is also shown that, for a replacement ratio of recycled aggregate smaller than 0.3, the elastic modulus of recycled concrete is reduced by no more than 10%.

#recycled concrete #elastic modulus #recycled aggregate #fast Fourier transform #crushed aggregate

참고문헌 (38)

참고문헌 신청

Xiangyi Zhu / 2018 / Mechanical properties of pervious concrete with recycled aggregate / Computers and Concrete, An International Journal 21(6):623~635

Corinaldesi, V. / 2010 / Mechanical and elastic behavior of concretes made of recycled-concrete coarse aggregates / Constr. Build. Mater 24(9):1616~1620

Dapena, E. / 2011 / Effect of recycled sand content on characteristics of mortars and concretes / J. Mater. Civil Eng 23(4):414~422

de Oliveira, M.B / 1996 / The influence of retained moisture in aggregates from recycling on the properties of new hardened concrete / Waste Manage 16(1-3):113~117

Dhir, R. K. / 1999 / Suitability of recycled aggregate for use in BS 5328 designated mixes / Proc. Inst. Civ. Eng. Struct. Build 134(3):257~274

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