Category Archives: 2021

RESEARCH REGARDING THE USE IN ROAD TECHNIQUE OF BITUMINOUS SCHIST FROM ROMANIA

The use of bituminous schist is imposed by a significant increase in the price of bituminous binders, simultaneously with the gradual degradation of the road network in Romania, as well as with the increase of motorization and, therefore, the limitation of rehabilitation possibilities due to high costs. By incorporating bituminous schist into the asphalt mixture, a significant reduction in the amount of bitumen conventionally used is achieved, a binder that is currently only imported.

Also, given the progressive increase in demand for asphalt mixtures, and consequently for road bitumen, correlated with the quantitative and qualitative deficit of this essential material in road works, highlighted the importance of use in the preparation of bituminous mixtures of unconventional components, such as bituminous schist.

Considering that the only norm based on which the technological recipes for asphalt mixtures with bituminous sand are made underwent the last modifications in 1985, one of the specific objectives of the doctoral thesis was to update the technical specifications contained in the norm in order to streamline the process. associated with these mixtures and for a better national implementation of these practices. Without this long-awaited review, the use of this unconventional material would become more difficult, although it has both technical, economic and environmental benefits.

This report presents studies performed on experimental and theoretical activities, undertaken in order to acquire new knowledge on the specified materials, respectively the crushing sand used in the preparation of asphalt mixtures, based on observations, tests and interpretation of laboratory results, which, based on some already existing knowledge will lead to a significant improvement of the knowledge of applicability of these materials in a specific field, respectively that of construction materials.

Regarding the studies on bituminous schist, it is proposed to continue the research by preparing different types of technological recipes for asphalt mixtures where the classic sand is replaced with bituminous shale crushing sand and determining the physical-mechanical characteristics by laboratory tests.

Keywords: Bituminous Schist, Asphalt Mixtures, Bitumen.

THE PHYSICAL-MECHANICAL CHARACTERISTICS OF THE ASPHALT MIXTURES FOR BITUMINOUS COATINGS PREPARED WITH A HIGH BLAST FURNACE GRANULATED SLAG FILLER FROM THE LIBERTY GALATI PLANT, ROMANIA

Asphalt mixtures used for bituminous coatings consists of a homogeneous, compact mixture of natural aggregates agglomerated with bitumen. Replacing the natural filler with an artificial one, obtained as waste in the metallurgical industry, would lead to a saving of material and financial resources, being one of the methods of environmental conservation by conserving the relief, protecting localities from noise produced in stone quarries, reusing a waste material. The processing of granular blast furnace slag from Liberty Galati plant, country of Romania, into filler and their subsequent use in the preparation of asphalt mixtures, leads to obtaining favourable results on two of the most currently used types, AC16surf50/70 and AC22.4bin50/70.

The appreciation of the behaviour of the asphalt mixture prepared with blast furnace slag filler compared to a standard, leads to the conclusion that the mixture is correctly dimensioned and will withstand physical and mechanical factors.

Keywords: Asphalt Mixture, Blast Furnace Slag Filler.

PRECAST CONCRETE FENCE PANEL WITH PLASTIC BOTTLES AND RICE HULLS

Wastes that are not properly managed, especially liquid and solid waste from households and the community, are serious health hazards and lead to the spread of infectious diseases. Thus, the researcher formulated a solution to make them useful in order to minimize the excessive generation of waste. This study aims to develop a Precast Concrete Fence Panel made from recycled plastic bottles and rice hulls ash to be used for commercial and industrial sites, livestock backyards, landscapes, pools, and ports. Specifically, the appropriate proportion of materials in its fabrication was also determined. Its performance quality in terms of hardness, compressive strength, specific gravity and absorption was tested. Moreover, its acceptability in terms of performance, durability and reliability was likewise determined. This study adopted the developmental-descriptive method of research. The design and fabrication of the Precast Concrete Fence Panel resulted in a product that permits light and air-flow, has a pivotal post, stackable and with added green material. The performance quality of the Precast Concrete Fence Panel in terms of hardness, compressive strength, specific gravity and absorption is within the acceptable standard range for concrete. The performance, durability and reliability of the Precast Concrete Fence Panel were highly acceptable to the evaluators.

Keywords: Technology, Precast Concrete, Fence, Developmental-descriptive Method, Philippines.