239,643 research outputs found
R. Glass
No full text"Lieut R. Glas[s] 2/11 A.FR. Darwin 1943 - 44".Lieutenant R. Glas[s]. 2/11 Australian Field Regiment, Darwin 1943 - 44
Production and Testing of Kiln-cast Glass Components for an Interlocking, Dry-assembled Transparent Bridge
No full textA pedestrian glass bridge, located at the TU Delft campus site, is being designed by the TU Delft Glass & Transparency Lab. Specifically, the arch-formed bridge consists of cast glass, dry-assembled, interlocking components. To validate the shape of the components, glass mock-ups in 1:2 scale are kiln-cast and tested. This paper follows the elements’ production process from the 3D milled MDF model and the construction of disposable moulds via the lost-wax technique, to the kiln-casting at 940ºC with the “flowerpot method”. Steps are taken towards the refinement of the production technique, with emphasis in minimizing the occurrence of air bubbles, surface flaws and internal stresses that can reduce the load-bearing capacity of the components. Polarisation techniques are employed to define the residual stress distribution of the cast elements as well as to map the consolidated flow of molten glass and the areas of inhomogeneity or non-cohesion. The structural performance of the components and their interlocking behaviour are studied by conducting shear tests on three series comprising three glass bricks with a transparent PU interlayer in-between. The fracture patterns of the specimens are analysed and correlated with the flaws and internal stresses resulting from the kiln-casting process
The Application of Waste Float Glass, Recycled in Structural Beams made with the Glass Casting Method
No full textIt is not obvious to talk about glass recycling when we realize that a mature recycling procedure for glass bottles is already working well. However, apart from glass bottles, unfortunately, that a large amount of glass will disappear into landfills. This large quantity of unrecycled glass indicates that there is a large potential in upgrading the glass recycling process. In the field of architecture, we see a fast-growing interest in using glass, also for structures. The glass bricks of Crystal Houses in Amsterdam are a good illustration. Aiming at maximizing the recyclability of glass, this paper focuses on the structural use of the glass components made from recycled glass through kiln casting method. An overview of the existing glass recycling industry is given at the beginning, followed by a discussion of glass type to be recycled. After this the experimental process of the glass recycling is introduced, which uses coated float glass with tints as the basic material to be recycled. Following this, a further exploration in three structural properties of the recycled products is conducted, namely: Young’s modulus, coefficient of thermal expansion and the fracture strength, with mechanical experiments. Finally, the test results are analyzed together with the chemical composition of the recycled products, which is derived from X-ray fluorescence (XRF) analysis. The result contains the value of mechanical properties and it evaluates the possibility of the structural use as a recycled-float-glass beam. In the end of this paper, the future possibility and feasibility in structural application of recycling waste float glass are discussed.Applied MechanicsStructural Design & Mechanic
Swimming pools of glass
No full textIn projects involving swimming pools with structural glass, ABT Consulting Engineers has faced similar design requirements: maximal transparency, proper detailing, 100% water tightness and robust behavior. ABT developed a straightforward detailing to satisfy these requirements. The concept is applied in the glass swimming pool of the 900 Mahler project, where the layered and heat strengthened glass panes were designed with specific attention to the appropriate type of interlayer and functional, durable and practical support detailing. The implementation of a clear safety philosophy, backed by an executed risk analysis, led to a glass structure which functions in all circumstances. The panes were structurally analyzed on strength and stiffness with finite element software, with extra focus on the appropriate properties of the support conditions. The concept is ready to be applied in similar glass pools.Applied MechanicsOLD Structural Desig
[Letter from D. R. Glass to T. N. Carswell - June 1, 1942]
No full textA letter addressed to Mr. T. N. Carswell, Chairman, 24th Senatorial Dries, from D. R. Glass, President, Texas College, Tyler, Texas, dated June 1, 1942. Glass advises that there is no course on the effects of alcoholism
Regeneration Of Thermally Recycled Glass Fibre For Cost-Effective Composite Recycling : Overview of the ReCoVeR projects
No full textGlobal production of composite materials in 2015 will significantly exceed 10 million tons. Glass fibre reinforced composites account for more than 90% of all the fibre-reinforced composites currently produced. Development of economically viable processes for recycling end-of-life glass fibre composites would have major economic and environmental impacts. This presentation introduces the ReCoVeR projects on enabling cost-effective performance regeneration of glass-fibres from thermal recycling of end-of-life automotive and wind energy composites. ReCoVeR technology targets treating glass fibre thermally reclaimed from GRP waste in order to regenerate a performance level which is equivalent to new fibres. Composite materials reinforced with ReCoVeR glass fibres can currently attain over 80% of the reinforcement performance of composites produced with pristine glass fibres
Building and Testing Lenticular Truss Bridge with Glass-Bundle Diagonals and Cast Glass Connections
No full textOn the campus of Delft University the Glass and Transparency Research Group is preparing to build a pedestrian bridge as a low arch consisting of dry-stacked glass blocks. As temporary support for the arch, a lens-shaped truss has been constructed and placed on location. This truss has been fitted with as many glass components as was structurally feasible. The diagonals in the truss are glass bundle struts and the nodes of the truss are cast glass components. The lenticular truss will serve as a temporary bridge during the time the team needs to prepare for construction of the eventual Glass Arch Bridge. Due to the experimental nature of the truss, with its unusual and novel applications of structural glass, a number of demonstrative proof loadings were performed to ease concerns about the safety of the structure. The glass bundles have been proof-loaded to twice their maximum expected load just prior to their installation in the structure. The whole system has then been proof-loaded for several critical load combinations (static and dynamic) just after installation. During the proof-loading the strains in the glass diagonals have been measured. These lie easily within the acceptable limits. In the paper the structural design of the bridge, in particular the glass node connector and the glass bundle diagonals will be explained. Then the proof-loading of the bridge will be described. Then the results of the proof-loading are presented and discussed.OLD Structural DesignApplied Mechanic
The dependence of the weathering of soda–lime–silica glass on environmental parameters: a preliminary investigation
No full textThe chemical resistance (durability) of glass depends both on its chemical composition and on the chemical (type and
amount of the molecules interacting with the glass surface) and physical (temperature, humidity, time, etc.) environmental
parameters. A wide literature is available concerning glass weathering mechanisms, mainly involving leaching processes,
but only few investigate the effects of each critical parameter. This study considers the dependence of soda–lime–silica
glass alteration on temperature, relative humidity and time in the case of glass in a confined environment. The aim is to
simulate the experimental conditions related to the weathering of the inner surface of empty glass containers that occurs
during the storage in industrial pallets. A low cost experimental apparatus was set up, in which humidity and temperature
were controlled by high performance homemade devices. The dependences of humidity, temperature and time on the
glass leaching and on the formation of weathering products of low durability soda–lime–silica glass was investigated
by optical and electronic microscopy (SEM), x-ray microanalysis and micro-infrared reflectance spectroscopy (IRRS)
Thermal, optical and mechanical properties of new glass compositions containing fly ash
No full textThe investigation of new compositions is crucial for the expansion of possible applications of glass, from the typical applications for building engineering, in the form of cast blocks or float glass, to more advanced technologies, such as 3D-printed glass or glass-to-metal connections. Since high melting temperatures and brittleness are two important drawbacks of glass, this work aims to improve both properties. Characterisation techniques, such as thermal analysis, nano-indentation, and UV/VIS spectroscopy, are used to evaluate the properties of the samples. The modification of the properties is achieved via changes in the composition of the glass, using compounds such as phosphorus pentoxide, aluminium oxide and boron oxide. Then, the choice of different glass formers and modifiers contributes to the development of compositions with lower melting and glass transition temperatures. The reduction of the melting temperature allows a saving of energy during the manufacturing. The structures of the glasses differ from the standard soda–lime–silica and borosilicate glasses, leading to a different mechanical behaviour. Furthermore, these new compositions incorporate up to 35% of fly ash in their formulas. The valorisation of these by-products reduces costs and gas emission.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Materials and EnvironmentStructural Design & MechanicsApplied Mechanic
Methods to estimate the number of surface nucleation sites on glass particles
No full textBased on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory, we propose two new models to describe the crystallisation kinetics of glass particles and use them to determine the density of nucleation sites, N(s), on glass powders. We tested these models with sintered compacts of diopside glass particles using sinter-crystallisation treatments at 825 degrees C (T(g)similar to 727 degrees C), that covered from null to almost 100% crystallised volume time fraction. We measured and compared the evolution of the crystallised volume fractions by optical microscopy and x-ray diffraction. Then we fit our expressions to experimental data using Ns and R (the average particle radius) as adjustable parameters. For comparison, we also fit to our data existing expressions that describe the crystallised volume fraction in glass powders. We demonstrate that all the methods allow one to estimate N(s) with reasonable accuracy. For our ground and water washed diopside glass powder, N(s) is between 10(10)-10(11) sites.m(-2). The reasonable agreement between experimental and adjusted R confirms the consistency of all five models tested. However, one of our equations does not require taking into account the change of crystallisation mode from 3-dimensional to 1-dimensional, and this is advantageous
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