1. Ohno, K., Ohtsu, M.: Crack classification in concrete based on acoustic emission. Constr. Build. Mater. 24, 2339–2346 (2010)
2. Yun, H.-D., Choi, W.-C., Seo, S.-Y.: Acoustic emission activities and damage evaluation of reinforced concrete beams strengthened with CFRP sheets. Nondestruct. Test. Eval. Int. 43, 615–628 (2010)
3. Clark, M.R., McCann, D.M., Forde, M.C.: Application of infrared thermography to the non-destructive testing of concrete and masonry bridges. Nondestruct. Test. Eval. Int. 36, 265–275 (2003)
4. Iyer, S., Sinha, S.K., Pedrick, M.K., Tittmann, B.R.: Evaluation of ultrasonic inspection and imaging systems for concrete pipes. Autom. Constr. 22, 149–164 (2012)
5. Molero, M., Aparicio, S., Al-Assadi, G., Casati, M.J., Hernández, M.G., Anaya, J.J.: Evaluation of freeze–thaw damage in concrete by ultrasonic imaging. Nondestruct. Test. Eval. Int. 52, 86–94 (2012)