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Study on the engineering and electricity properties of cement mortar added with waste LCD glass and piezoelectric powders

  • Chang, Shu-Chuan (Department of Civil Engineering, National Kaohsiung University of Applied Sciences) ;
  • Wang, Chien-Chih (Department of Civil Engineering and Geomatics, Cheng Shiu University) ;
  • Wang, Her-Yung (Department of Civil Engineering, National Kaohsiung University of Applied Sciences)
  • Received : 2016.01.12
  • Accepted : 2018.01.04
  • Published : 2018.03.25

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 ($1870-3244{\Omega}.cm$), and the PZT group had a lower resistivity ($1419-3013{\Omega}.cm$), meaning that the resistivity increases with the replacement of waste LCD glass powder. This is because the waste LCD glass powder contains 62% $SiO_2$, which is a low dielectric material that is an insulator. Therefore, the resistivity increases with the $SiO_2$ content.

Keywords

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