Author(s): Chun-Ling Ho; Kai-Lin Hsu; Her-Yung Wang; Yu-Wen Chen
Keywords: Waste lcd glass sand; Alkali-activated cementitious paste; Compressive strength; Marine engineering
Abstract: As the world advocates sustainable and cyclic development, recycling of industrial byproducts has been extensively adopted, such as slag powder and waste LCD glass sand. The disposal and recycling of waste can be solved, and the policy objective for the sustainable development of resources can be implemented. Moreover, Taiwan is located in the subtropical zone and surrounded by the sea. Coastal structures are prone to corrosion due to the intrusion of marine salt. The development of marine engineering structure materials in Taiwan should be the direction of vigorous development. This study applies industrial by-products to marine engineering structures Exploration of materials. Waste LCD glass sand is combined with alkali-activated cementitious paste as the main material of mortar specimens, and different liquid-solid ratios (L/S=0.45,0. 50,0. 55 and 0.60) are used. The base equivalent is fixed at 1%, and slag powder is replaced by glass sand (0,20 and 40%). The fresh properties (slump, slump flow and setting time), hardened properties (compressive strength and ultrasonic pulse velocity) and durability (thermal conductivity and sulfate resistance) are determined after aging for 3,7 and 28 days. The results show that as the glass sand replacement level increases, the workability becomes better, the slump is increased by 11.6%~39.4%, the slump flow is increased by 19.5%~51.2%, the initial and final setting times are increased by 7.9~79.4% and 25.8~53.3%, respectively, the compressive strength is increased by 2.53%~180.73%, the ultrasonic pulse velocity is increased by 59.8%~101.2%, the thermal conductivity is 0.8769~1.1873 W/m*K and the sulfate resistance is good, thereby indicating that waste LCD glass sand has good engineering properties.