Possibility of using recycled waste medical-glass as fine aggregate in normal-strength concrete

The possibility of using recycled waste medical-glass aggregate (RGA) as a fine aggregate in the production of normal-strength concrete was investigated in this study. The influence of RGA as crushed sand (CS) replacement at different levels (by volume) of 0 – 100% (an interval of 20%) on the engineering properties and durability of concrete was also studied. Results show that the replacement of CS by RGA insignificantly affected the workability and unit weight of fresh concrete mixtures. Besides, using RGA to replace 20 – 60% CS was beneficial in terms of compressive strength, drying shrinkage, and ultrasonic pulse velocity (UPV). At these replacement levels, the dry density values were found to increase and the water absorption values were reduced as well. However, replacing CS with RGA up to 80% and 100% caused a reduction in compressive strength, dry density, and UPV and an increase in water absorption and drying shrinkage of concretes. Closed correlations among the above-mentioned concrete properties were also found in this study. All of the concrete samples obtained compressive strength values higher than the target strength (≥ 25 MPa) and they were classified as very good quality concretes with UPV values of above 4100 m/s. The experimental results demonstrate a high possibility of producing normal-strength concrete with a fine aggregate of RGA as either partially or fully replacement of CS. This also provides an environmentally-friendly solution for recycling waste medical glass in construction materials for sustainable development.

Digital transformation at Murano Glass: Challenges and new directions

In 1949, Giovanni Murano decided to build a business from the art of glass manufacturing, leveraging the knowledge and skills available in the universally known cradle of glassmaking art, Venetian Lagoon, Italy. The company specialised in the production of glass bottles. Over the years, the company expanded and set up global footprints, positioning itself as market leader in medical glass products. The expansion into new regions required the use of advanced digital tools that will monitor performance and improve productivity across numerous dispersed manufacturing sites. It was a sweltering day in July 2019, Giuseppe stood next to the air-conditioning system, just 20 m from the overheated production line. It magnified the intensity of output as he explained the innovative ideas he had for the company: ‘Digital technologies are changing our society and working life and we need to use them to change the way Murano Glass operates and competes’. He described the implementation of an application that enabled remote assistance with augmented reality and a peer-assistance platform to connect employees all over the world. It would unite a geographically dispersed team and streamline connectivity. Despite his enthusiasm for the initiative, however, the budget for digital projects had shrunk and management support was lacking. His ideas for digital transformation were not progressing as he had hoped. Giuseppe wondered what was going wrong in Murano Glass’s digital transformation journey.

DESIGNED OF CONCRETE DISTRIBUTOR LEVEL B15 WITH MEDICAL GLASS AGGREGATES AND CRUSHED SAND

The project has built and found suitable mix proportion for compacted glassconcrete, corresponding to Soundness B15 of normal concrete by laboratory method. The experimental gradations were used 5% or 10% cement content with the control (witnessing) gradation. The results of the study: finding the suitable components to create glass-concrete, using glass aggregate and grinded sand for the same Soundness as B15; Handling medical-glass-bottles and contributing to handle the local scarcity of sand, making a new construction product that is highly applicable in practice. However, for more efficient use, additional tests of tensile strength and other related properties must be carried out.

The Research of N/C-Codoped TiO2 Films Deposited by Arc Ion Plating

The N/C co-doped TiO2thin films were successfully deposited on medical glass slide by pulsed negative bias arc ion plating. The influence of pulsed negative bias, annealing temperature on films properties was investigated. Film structure, surface morphologies and optical properties were measured with XRD, SEM and UV-VIS transmittance spectroscope. The results show that the most absorption edges of the as-deposited films increase with the rising of the pulse negative bias, and the maximum of 540 nm is achieved under-600V bias. The films absorption edges increase in different degree after annealing at 400°Cfor 2h and 4h, and the best extension can increase 46nm after annealing. The interaction of the annealing treatment and bias functions enhance the N and C reaction activities and extend absorption edge. The greatest absorption edge dater of the co-doped TiO2films under the negative pulse bias for 0V can reach 550nm after the annealing at 400°Cfor 2h. The crystal morphology become inconspicuously with the bias increasing from 0V to-300V, which is corresponding to the XRD result, the anatase diffraction peaks weaken obviously.

The Research of the Zn2TiO4 Films Grown by Magnetron Sputtering

The uniform and transparent Zn2TiO4series thin films were successfully deposited on medical glass slide by magnetron sputtering. The influences of the Zn-doped quantity and annealing treatment on films properties were investigated. Film structure, surface morphologies and optical properties were measured with XRD, SEM and UV-VIS transmittance spectroscope. The results show that the Zn-doped quantity and annealing treatment have influence on the absorption edges. The absorption edges of the films can increase 10nm after annealing treatment. The intensity of c-series ZnTiO3diffraction peaks is higher, which may be that the grain size is bigger and the crystallization is complete. The annealing treatment not only growing up grain size of composite films, but also the surface films have tiny crack phenomenon.

Effects of N-Doped Quantity and Current Density on Properties of TiO2 Films by Arc Ion Plating

TiO2thin films of different N-doped quantity and different current density were deposited on medical glass slide by arc ion plating. Film structure, surface morphology and optical properties were measured with XRD, SEM and UV-VIS transmittance spectroscope. Photo-catalytic performance of the films was evaluated by degradation methyl orange. The current density, O2partial pressure and N2partial pressure were varied in order to determine their effect on the properties of TiO2films. The study got the best doped process (current 50A，O250sccm, N2250 sccm, Ar 20sccm). In these experimental conditions, the absorption edge successfully moved to 510nm, the as-deposited TiO2films structure was composed with anatase and rutile. The annealing treatment made the crystal microscopy more obviously. The N-doped TiO2film not only reduced the UV catalytic performance , but also extended the catalytic properties to the sun light.