A study of engineering and electricity properties of cement mortar added with recycled materials and piezoelectric powders

作者：Wang Her Yung^*; Wang Chien Chih; Chang Shu Chuan; Lin Jhan Cyue

来源：Construction and Building Materials, 2016, 113: 297-305.

DOI：10.1016/j.conbuildmat.2016.03.056

• Fly ash
• Ground granulated blast furnace slag (GGBFS)
• Waste LCD glass powder
• Pd-Zr-Ti piezoelectric (PZT)
• Engineering and electricity properties
• Cement mortar

Due to increasing global energy saving, carbon reduction, environmental considerations, and the environmental change resulting from the greenhouse effect, and because Taiwan is located on the plate junction, where earthquakes frequently occur, and because there is an abundance of rainfall during typhoon season, which often cause natural disasters, it is necessary to enhance the disaster prevention of buildings. This study uses recycled materials (fly ash, ground granulated blast furnace slag (GGBFS), and waste Liquid Crystal Display (LCD) glass powder) and Pd-Zr-Ti piezoelectric (PZT) to enhance intelligent functions of original substrates. The volumetric method is used for the design. The control group uses recycled materials to replace cement [0%, 10%, 20%, and 30%]. The PZT group uses a PZT powder to replace 5% of fine aggregates to make cement mortar to test the correlation between engineering and electricity properties of flow, compressive strength, water absorption, ultrasonic pulse velocity (UPV) and resistivity (electricity at 50 V and 100 V). The mechanical and electrical effects of cement mortar of various groups are discussed to determine the correlation between impedance characteristics and mechanical behavior of cement mortar in different electrical field environments and aqueous states, to build an engineering-electricity relation database for recycled materials and PZT, and to determine the relationships between various variables. A pozzolanic reaction occurs in GGBFS after 7 days. A 30% GGBFS replacement (32.9 MPa) has the maximum compressive strength. A 20% waste LCD glass powder replacement (31.8 MPa) can fill up finer pores and accelerate hydration. The addition of GGBFS and waste LCD glass powder reduces water absorption and internal porosity. Water absorption increases when fly ash is replaced. The resistivity at 50 V is higher than resistivity at 100 V in an electrical field environment. Specifically, in a high voltage environment, the resistivity generated during the delivery process is reduced. Because the voltage increase improves conductivity inside the specimen, the resistivity is reduced. The resistivity increases in correlation with compressive strength in the SSD state of fly ash and GGBFS. The resistivity decreases when the compressive strength increases in the OD state. The resistivity increases when the waste LCD glass powder is replaced in SSD and OD states.

• 出版日期2016-6-15