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Physical model of drying shrinkage of recycled aggregate concrete

  • Cementitious materials
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Abstract

We prepared concretes (RC0, RC30, and RC100) with three different mixes. The poresize distribution parameters of RAC were examined by high-precision mercury intrusion method (MIM) and nuclear magnetic resonance (NMR) imaging. A capillary-bundle physical model with random-distribution pores (improved model, IM) was established according to the parameters, and dry-shrinkage strain values were calculated and verified. Results show that in all pore types, capillary pores, and gel pores have the greatest impacts on concrete shrinkage, especially for pores 2.5-50 and 50-100 nm in size. The median radii are 34.2, 31, and 34 nm for RC0, RC30, and RC100, respectively. Moreover, the internal micropore size distribution of RC0 differs from that of RC30 and RC100, and the pore descriptions of MIM and NMR are consistent both in theory and in practice. Compared with the traditional capillary-bundle model, the calculated results of IM have higher accuracy as demonstrated by experimental verification.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China

    Yuanchen Guo  (郭远臣) & Jueshi Qian

  2. College of Civil Engineering, Chongqing Three Gorges University, Chongqing, 404100, China

    Yuanchen Guo  (郭远臣) & Xue Wang

Authors
  1. Yuanchen Guo  (郭远臣)
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  2. Xue Wang
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  3. Jueshi Qian
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Correspondence to Yuanchen Guo  (郭远臣).

Additional information

Funded by the National Natural Science Foundation of China (51202304), the China Postdoctoral Science Foundation (2014M552320) and Scientific, the Technological Talents’ Special Funds of Wanzhou District and Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJ1401016) and the Youth Project of Chongqing Three Gorges College (13QN-20)

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Guo, Y., Wang, X. & Qian, J. Physical model of drying shrinkage of recycled aggregate concrete. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 1260–1267 (2015). https://doi.org/10.1007/s11595-015-1305-4

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  • DOI: https://doi.org/10.1007/s11595-015-1305-4

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