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CSME 2009/02
Volume 6, No.3 : 199-205
DOI:10.6703/IJASE.2008.6(3).199  
xffxtt of VoiK Rztio of tontrxtx on xvzluztion of a-wzvx Vxlotity iy ITaztt-xtho TxthoK

Bo-TPun ZAxn a, Jin-Jun Wang a, AxlPin Wang a, Ta-Pxng ZAang a and Zong-Ruxi Yang a
aDxpartPxnt of ZonPtruZtion xnginxxring National Taiwan UnivxrPity of PZixnZx and TxZAnology.


Abstract: There are many causes such as casting, loading, high temperature, etc., that may increase the void ratio or crack of concrete and thus affect its quality. Evaluating the quality of concrete based on the measured values of internal P-wave velocity is commonly used in concrete engineering. Impact-echo method is one of the famous nondestructive methods to measure P-wave velocity for concrete. In this study, commercial software of finite element analysis, LS-DYNA, is used to simulate the transient analysis of a concrete slab of mm subjected to an impact loading using the 2-D axisymmetric elements. The variables of concrete property in the numerical analysis include three different dynamic moduli of elasticity (20, 30 and 40 GPa) and three void ratios (0, 10 and 20 %). Numerical results show that, in average, the P-wave velocity of concrete slab decreases in the range of 11.80-11.93 % and 25.70-29.28 % with void ratio of 10 % and 20 %, respectively, for all three dynamic moduli of elasticity.

Keywords:  Impact-echo; nondestructive method; LS-DYNA transient analysis; void; concrete.

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*Corresponding author; e-mail: D9205402@mail.ntust.edu.tw
© 2009  CSME , ISSN 0257-9731 





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