The 4th Asian Concrete Federation Symposium on Emerging Technologies for Structural Longevity (ACF2023- ETSL)

236 / 2022-06-15 08:47:57

Study on phase reconfiguration and alkali-aggregate reaction of regenerated glass fibers based on GFRP

Recycled glass fibers；,Alkali activity,GFRP waste,Cement-based composite

GFRP has been widely used in various industrial fields because of its excellent properties such as high strength, high specific stiffness, corrosion resistance and temperature resistance, but in the process of recycling waste products that have expired in service, due to its refractory and difficult to process characteristics, the realization of high-value recycling and reuse of solid waste GFRP has always been a hot issue in the scientific and technological community and industry. The separation of glass fibers and resin matrix in solid waste GFRP and the preparation of recycled glass fibers in the geotechnical field is an effective consumption method with good promotion prospects, while the glass fiber sources used in waste GRFF Do not have homogeneity and stability, which is mainly manifested as the difference in alkali activity in glass fibers, resulting in alkali-aggregate reaction of glass fibers in the geotechnical field, affecting the large-scale promotion and application of recycled glass fibers. In view of the difficulties in the application of recycled glass fibers, this paper recrystallizes some of the active SiO2 with amorphous form and poor crystallinity in the waste glass fibers into a relatively stable crystal state by means of heat treatment regulation, so as to avoid alkali aggregate reaction with the alkali aggregate in cement matrix composites.