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Computers and Concrete
  Volume 21, Number 3, March 2018 , pages 311-319
DOI: https://doi.org/10.12989/cac.2018.21.3.311
 


Study on the engineering and electricity properties of cement mortar added with waste LCD glass and piezoelectric powders
Shu-Chuan Chang, Chien-Chih Wang, Her-Yung Wang

 
Abstract
    This study used a volumetric method for design. The control group used waste Liquid Crystal Displayplay (LCD) glass powder to replace cement (0%, 10%, 20%, 30%), and the PZT group used Pd-Zr-Ti piezoelectric (PZT) powder to replace 5% of the fine aggregate to make cement mortar. The engineering and the mechanical and electricity properties were tested; flow, compressive strength, ultrasonic pulse velocity (UPV), water absorption and resistivity (SSD and OD electricity at 50 V and 100 V) were determined; and the correlations were determined by linear regression. The compressive strength of the control group (29.5-31.8 MPa) was higher than that of the PZT group (25.1-29 MPa) by 2.8-4.4 MPa at the curing age of 28 days. A 20% waste LCD glass powder replacement (31.8 MPa) can fill up finer pores and accelerate hydration. The control group had a higher 50 V-SSD resistivity (1870-3244 o.cm), and the PZT group had a lower resistivity (1419-3013 o.cm), meaning that the resistivity increases with the replacement of waste LCD glass powder. This is because the waste LCD glass powder contains 62% SiO2, which is a low dielectric material that is an insulator. Therefore, the resistivity increases with the SiO2 content.
 
Key Words
    waste LCD glass powder; Pd-Zr-Ti piezoelectric (PZT); Engineering and electricity properties; cement mortar; linear regression
 
Address
Shu-Chuan Chang, Her-Yung Wang: Department of Civil Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 807, Taiwan, R.O.C.
Chien-Chih Wang: Department of Civil Engineering and Geomatics, Cheng Shiu University, Kaohsiung, 833, Taiwan, R.O.C.
 

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