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Experimental investigation on dynamic mechanical characteristics and microstructure of steam-cured concrete

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  • Special Topic: High-speed Railway Infrastructure
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Abstract

Steam-cured concrete is widely used to manufacture prefabricated units of high-speed railway foundation structure such as girder and track slab. The dynamic mechanical property of steam-cured concrete is one of the key properties affecting service performance of high-speed railway foundation structure. In the present paper, serial macro/micro-experiments were carried out to investigate the dynamic elastic modulus, shear modulus, damping ratio, and microstructure of steam-cured concrete. The relationships between compositions, curing regime, microstructure, and dynamic properties of steam-cured concrete as well as the corresponding mechanisms were discussed. The results indicate that steam-cured concrete in early age has a larger dynamic elastic modulus and shear modulus as well as a smaller damping ratio compared with standard-cured concrete. On the contrary, at a later age a slightly smaller dynamic elastic modulus and a larger damping ratio of steam-cured concrete are observed. Addition of mineral admixture results in a bit lower dynamic elastic modulus and damping ratio of concrete than that of the control specimen without mineral admixtures. The achievements can provide some fundamental suggestions for materials parameters selection during structural design of steam-cured concrete precast element.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    GuangCheng Long, Meng Wang, YouJun Xie & KunLin Ma

  2. National Laboratory for High Speed Railway Construction Technology, Changsha, 410075, China

    GuangCheng Long, YouJun Xie & KunLin Ma

Authors
  1. GuangCheng Long
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  2. Meng Wang
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  3. YouJun Xie
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  4. KunLin Ma
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Correspondence to GuangCheng Long.

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Long, G., Wang, M., Xie, Y. et al. Experimental investigation on dynamic mechanical characteristics and microstructure of steam-cured concrete. Sci. China Technol. Sci. 57, 1902–1908 (2014). https://doi.org/10.1007/s11431-014-5635-9

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  • DOI: https://doi.org/10.1007/s11431-014-5635-9

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