1. School of Highway,Chang'an University,Xi'an 710064,China 2. Shandong Transportation Institute,Jinan 250014,China 3. Research Institute of Highway Ministry of Transport,Beijing 100088,China
A detailed description of impact-echo method was given firstly,then four different situations of grouting quality were modified from empty to dense through making test model.After that,the impact-echo method was adopted to detect the grouting quality of tendon ducts.The study was summarized as follows:If the reflection time of slab bottom and nominal thickness of slab increased,the degree of density would increase;the reflection time and nominal thickness of slab was the biggest when testing was from half-hole of web.At the same time,the reflection time of compacted and uncompacted tendon ducts was basically the same.In the end,the uncompacted parts of the prestressed pipe grouting were put forward.The method was verified by the engineering project and was proved to be of reference value.
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