Research on Evaluation Method of Ultrasonic Testing for Inspection of Concrete Jointing Surface Quality

Abstract:

The combining Part Of new-old concrete is a weak link. The cohesive strength of the combining layer is generally lower than the strength of the concrete poured completely. It will greatly affect the reliability of structure, when the combining layer is bad. It is a effective method to Inspect combining surface conditions by ultrasonic method. But related specification for defect judgment method of ultrasonic method, which is not fit to detect the defect area is larger in detect area, the overall quality of members is poor, make the discreteness of data less, those causes low judgment value, and the defects to leakage. In addition, the less data is not easy to found out the outliers. We adopted ultrasonic angle measurement method for concrete jointing surface of 50 pillars testing analysis, Method to determine the critical value of defect of abnormal value, and studied critical value determination method of defects outliers, propose a method of defects determination base on the common probability method. As detection is shown, first, with this method detect the joint surface of the concrete columns, contrasted core drilling results, prove the method is effective and feasible. Second, For new pouring concrete quality is poorer near surface, defect points too much, contrasted core drilling results, prove the method is effective and feasible. In addition, using this method for detecting data less, contrasted core drilling results, prove the method is effective and feasible.

• Periodical: Applied Mechanics and Materials (Volumes 501-504)
• Pages: 877-880
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.501-504.877
• Online since: January 2014
• Authors: Lin Liu*, Qiang Wang, Kai Guo
• Keywords: Custom Defect Discrimination Threshold, Joint of Surface, Ultrasonic Test

References

[1] Bungey J.H.: The validity of ultrasonic pulse velocity testing of in-place concrete for strength, NDT International, Vol. 13(6)(1980), p.296.

DOI: 10.1016/0308-9126(80)90021-8

[2] Kim H.M., Bartkowicz T.J.: A two-step structural damage detection approach with limited instrumentation. Journal of Vibration and Acoustics, Vol. 119(2)(1997), p.10.

DOI: 10.1115/1.2889712

[3] K. Tharmaratnam, B.S. Tan: Attenuation of ultrasonic pulse in cement mortar. Cem. Concr. Res, Vol. 20(1990)p.336.

[4] China Engineering Construction Standardization Association standard, technological specification for inspection of concrete defects by ultrasonic method, [CECS 21: 2000], BeiJ, (2000).