Conference Publications

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https://hdl.handle.net/20.500.14170/379

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Browsing Conference Publications by Author "Andreea-Georgiana Baraitaru"
  • Publication
    Assessing the applicability of ecological materials obtained with CRT glass
    (IOP Publishing, 2020)
    Florina-Diana Dumitru
    ;
    Mihaela-Andreea Moncea
    ;
    Andreea-Georgiana Baraitaru
    ;
    Petrache-Ionut Gheorghe
    ;
    Silvius Stanciu
    ;
    György Deák
    ;
    Romisuhani Ahmad
    Recovery and recycling of cathode ray tube (CRT) waste glasses has been the focus of research in the last decade, due to their environmental and economie issues (such as leaching of lead ions, high disposal costs). A sustainable method of valorizing this hazardous waste is to embed it in cement, as a substitute for the natural aggregate. Therefore, within the present study, ecological materials with cementitious matrix were synthesized by using glass waste recovered from cathode ray tube monitors (CRT glass), which replaced the aggregate in different proportions (varying from 10 to 30%), and by substituting 25% of cement with lime paste. The compression strength of the obtained specimens was determined after 1, 2, 7 and 28 days of hardening and highlighted that the samples with lower CRT glass substitution percentage performed relatively similar to the reference sample. This behavior can be explained by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The samples microstructure revealed the presence of ettringite, calcium hydroxides, hydrosilicates and hydroaluminates, calcite and some unreacted particles. The opportunity of using these materials in practical applications was assessed by developing masonry specimens - the obtained mortar paste was interposed between two brick slabs, which were mechanically tested after 7 days of hardening. Both splitting tensile strength and flexural strength varied with the increase of CRT glass in the composition.
  • Publication
    Assessing the recovery opportunities of different types of wastes by their embedment in inorganic binders
    (IOP Publishing, 2020)
    Mihaela-Andreea Moncea
    ;
    Florina-Diana Dumitru
    ;
    Andreea-Georgiana Baraitaru
    ;
    Mădălina Georgiana Boboc
    ;
    György Deák
    ;
    Rafiza Abd Razak
    The use of wastes in the architecture of new binders for construction domain is the key for the success of the progress regarding environmental, technical and economical issues. For instance, bricks wastes have huge recycling value but are often discarded for worthless junk. The wastes glasses which are difficult to be recovered are regularly disposed in landfflls although they successfully could replace the fine and coarse aggregates in concrete. More than that the glass aggregates can be used for decoration of concrete structure floors, patio, entrances etc. Paper slag ash has a similar chemical composition to that of cement, but the mineral phase composition significantly differs and is no reactive with water. Therefore she can be used in the production of concrete, a beneficial idea regarding exhaustible resources and intelligent recycling within circular economy and durable development context. Although the large paper producers fight with this challenge, until now the construction industry didn’t find the courage to tackle these opportunities, continuing to adopt classical methods for designing construction materials. In this context the paper presents reuse potential of different types of wastes as supplementary addition for cement based materials obtaining. In order to demonstrate their functionality the new mortars specimens were mechanically tested. The obtained results highlighted of many times similar properties with that of the classical compositions, sustaining thus the idea of sustainable development within civil industry domain.