Combined effects of liquid crystal display glass and recycled tire powders on the tensile behavior of strain-hardening alkali-activated slag composites

초록

This study investigates the combined effects of liquid-crystal-display glass powder (LCDGP) and waste tire powder (WTP) on the mechanical behavior of strain-hardening alkali-activated slag composites (SH-AACs). Ground granulated blast-furnace slag is partially replaced with LCDGP at proportions of 25 %, 50 %, and 75 %, whereas silica sand is substituted with WTP at ratios of 0 % to 70 %. Compressive strength and direct tensile performance are evaluated based on microstructural analyses, including X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and the quantitative assessment of microcrack behavior using digital image correlation. The results show that the highest compressive strength (i.e., 91.16 MPa) is achieved by a mix containing 25 % LCDGP and 20 % WTP. A reduction in LCDGP content improved the tensile performance, with the highest tensile strengths observed at 50 % or 70 % WTP content. The energy-absorption capacity increases with WTP content; specifically, an enhancement by 56 % is demonstrated by an SH-AAC comprising 75 % LCDGP and 70 % WTP. Crack-behavior analysis shows that the LCDGP content minimally affects the crack density, whereas increasing the WTP content facilitates the formation of smaller microcracks, which is attributed to the crack-bridging properties and artificial defect effects of WTP. These findings highlight the potential of LCDGP and WTP as sustainable materials for enhancing the performance of SH-AACs.

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