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The detection of grouting compactness of pre-stressed ducts based on the impact-echo method
Guang-Zhen QU, Guang-Li ZHOU, Ke-Chao ZHANG, Yan-Wei WANG
Geophysical and Geochemical Exploration . 2019, (4): 919 -924 .  DOI: 10.11720/wtyht.2019.1098

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