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Computers and Concrete
  Volume 6, Number 3, June 2009 , pages 225-234
DOI: https://doi.org/10.12989/cac.2009.6.3.225
 


Homogeneity of lightweight aggregate concrete assessed using ultrasonic-echo sensing
H. Y. Wang, L. S. Li, S. H. Chen and C. F. Weng

 
Abstract
    Dredged silt from reservoirs in southern Taiwan was sintered to make lightweight aggregates (LWA), which were then used to produce lightweight aggregate concrete(LWAC).This study aimed to assess the compressive strength and homogeneity of LWAC using ultrasonic-echo sensing. Concrete specimens were prepared using aggregates of four different particle density, namely 800, 1100, 1300 and 2650 kg/m3. The LWAC specimens were cylindrical and a square wall with core specimens drilled. Besides compressive strength test, ultrasonic-echo sensing was employed to examine the ultrasonic pulse velocity and homogeneity of the wall specimens and to explore the relationship between compressive strength and ultrasonic pulse velocity. Results show that LWA, due to its lower relative density, causes bloating, thus resulting in uneven distribution of aggregates and poor homogeneity. LWAC mixtures using LWA of particle density 1300 kg/m3 show the most even distribution of aggregates and hence best homogeneity as well as highest compressive strength of 63.5 MPa. In addition, measurements obtained using ultrasonic-echo sensing and traditional ultrasonic method show little difference, supporting that ultrasonic-echo sensing can indeed perform nondestructive, fast and accurate assessment of LWAC homogeneity.
 
Key Words
    dredged silt; ultrasonic-echo sensing; lightweight aggregate concrete (LWAC); compressive strength; homogeneity.
 
Address
H. Y. Wang: Department of Civil Engineering, National Kaohsiung University ofApplied Sciences, Kaohsiung, Taiwan, R.O.C.
L. S. Li: Assets and Property Management, Hwa Hsia Institute of Technology, Taipei, Taiwan, R.O.C.
S. H. Chen: Department of Civil Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, R.O.C.
C. F. Weng: Department of Civil Engineering, National Kaohsiung University ofApplied Sciences, Kaohsiung, Taiwan, R.O.C.
 

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