Investigation of structure quality using geophysical methods on concrete and reinforced concrete structures

INVESTIGATION OF STRUCTURE QUALITY USING GEOPHYSICAL METHODS ON CONCRETE AND REINFORCED CONCRETE STRUCTURES Researchers which has worked about determination of structure quality using geophysical methods are painted a positive picture of big improvements. Nowadays ground penetrating radar (GPR), electrical resistivity and ultrasonic method have often been used at structure geophysic research.Aim of thesis is to investigate effect of geophysical methods which have been used in structure research. Evaluation of taken measurements by high frequency GPR, ultrasonic and resistivity tools on reinforced concrete samples, concrete which was especially prepared and existing structure was done. Estimation of concrete strength from pulse velocity measurement, degree of corrosion estimated from electrical resistivity measurements, numbers and depths of reinforcement, from GPR profiles on different samples of structure were discussed in this study. Vertical and horizontal reinforced concrete samples and cubic concrete samples were designed in this work. GPR, resistivity and ultrasonic measurements were taken on vertical concrete sample. GPR and ultrasonic measurements were taken on horizontal concrete sample. Ultrasonic and compression tests were done on cubic samples. Furthermore, GPR, ultrasonic and resistivity methods were applied on existing concrete column. Data found by gpr method were evaluated by software and steel bars were determined. According to data collected by electirical resistivity method, corrosion degree of structures were identifed. Concrete quality found by ultrasonic measurements and detection of fractures were done and compared with compression test results. In this study, it is understood that determination of steel bars and pvc pipes, concrete quality, detection of fractures and degree of corrosion in construction by using geophysical methods can be determined fast, cheap and non-destructive.