In order to streamline the mixes of concrete with powder waste glass as small as < 0.250 mm, a postdoctoral program objective was to test the activity rate of its pozzoolanic reaction, through various methods and by comparing it with other powders reactions in a standardized cement composition. The first method was to determine the compressive strength of cement mortars, partially substituted by glass powder, silica fume, ash and clay. The second method was determining the chemical composition of the powder with fluorescence X-ray, XRF type. The third method, was based on fragments of mortar studied and subjected to microscopic observations – SEM determination (scanning electron microscopy) to investigate the microstructure of the raw material.
This paper discusses a new all-precast concrete system used in Romania to construct a residential building. Designed for constructability, a new all-precast concrete system comprising columns, flat slabs, and structural walls was proposed by the design team. To validate the structural quality and performance of this type of structure, an extensive program of theoretical analyses and structural tests (including shake table tests) was conducted. The tests demonstrated good behavior of the precast concrete dual system (frame-wall) adapted for a classic flat-slab structure. The connections resulted in a similar behavior of the precast concrete system to that of the monolithic solution. Due to its functional and technical advantages, high productivity, and low cost, this system has been used in more than 500 flats in Transylvania, Romania.
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