Grouting Defect Detection of Lapped Bar Connections Based on Impact-Echo Method

Figure 8

Waveforms and amplitude spectra obtained under different conditions. (a) Solid grout with reinforcement (hole A). (b) Solid grout without reinforcement (hole B). (c) Ungrouted (hole C). (d) Grout defect 10% at test surface 1 (hole D). (e) Grout defect 20% at test surface 1 (hole E). (f) Grout defect 30% at test surface 1 (hole F). (g) Grout defect 10% at test surfaces 1 and 2 (hole G). (h) Grout defect 20% at test surfaces 1 and 2 (hole H). (i) Grout defect 30% at test surfaces 1 and 2 (hole I). (j) Solid concrete (hole J).

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(b)

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(e)

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(g)

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