Impact-echo Characteristic Frequencies Response to Grouting Fullness in Ducts of Prestressed Box Beam and Application

As a new elastic wave method, the impact-echo method (IEM) was applied to evaluate grouting fullness in ducts of prestressed box beam. By comparing the characteristic frequencies of different grouting fullnesses in ducts by IEM, the variation of the characteristic frequencies and the judgment of the voids in ducts are researched. Based on experimental data of each test area, an empirical formula of calculating characteristic frequencies of concrete deck of box beam with voids in ducts is created. Color pictures are produced according to characteristic frequencies of the test areas. By comparing the test characteristic frequencies with calculated frequencies, the quality of grouting can be determined. Lastly, 4 test areas are judged as having voids in the ducts which is verified by the chiseled ducts with voids and photos of the voids. Results demonstrate that IEM is an effective method to evaluate grouting fullness in the prestressing ducts of box beam.

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  • Authors:
    • Zou, Chunjiang
    • Chen, Zhengzhou
    • Dong, Ping
    • Cao, Dongfang
    • Wu, Yongjing
  • Publication Date: 2010-1


  • Chinese

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  • Accession Number: 01152105
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 15 2010 2:44PM