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Condition of Inner Rubble Core of Stone Masonry
During pointing, it was noted that there were large voids in the interior of a stone masonry wall. GPR scanning and two dimensional imaging was used to survey the inner rubble core condition, which confirmed the presence of many large voided areas. The wall was repaired by injection of foamed grout. A subsequently GPR scan confirmed that the interior rubble core had been appropriately filled.
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Voids In Unit Masonry
GPR is particularly useful to find voids in construction materials. The example on the right illustrates the investigation of reinforced masonry units for proper grouting of reinforced masonry cells. Where the cells have been adequately filled, the masonry ties can be clearly seen without distortion and there is an even density of image within the grouting layer. Under these conditions, the reinforcing steel is often visible. Where gaps in filling occur, the high amplitude from the air voids dominates the signal, causing significant distortion throughout the defective area.
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