This article presents the results of a study dealing with the utilization of sludge water from a concrete plant as a partial replacement for mixing water in the production of cement composites. The replacement of mixing water with sludge water from a concrete plant was carried out in the amounts of 20% and 50%. The following tests were carried out in order to determine the effect of the replacement of mixing water with sludge water from a concrete plant on the physical and mechanical properties of the cement composites: cement mortar consistency, beginning and end of setting, strength characteristics (compressive strength and flexural strength), and thermal properties.The measured values of the strength characteristics of the test specimens after 28 days of age confirm the possibility of replacing mixing water with sludge water from a concrete plant without significantly reducing the compressive and flexural strength.
This article describes an experimental study aimed at investigating the potential use of recycled rubber granulate from waste tires of fractions 0/1 and 1/3 mm in cement composites as a 100% replacement for natural aggregates. The use of waste in the development and production of new building materials represents an important aspect for the sustainability and protection of the environment. This article is focused on the sound-absorbing and thermal-insulating properties of experimental cement composites based on recycled rubber from waste tires. The article describes the grain characteristics of recycled rubber, sound absorption capacity, thermal conductivity and strength characteristics. The results of this research show that the total replacement of natural aggregate with recycled rubber in cement composites is possible. Replacing natural aggregate with recycled rubber has significantly improved the thermal and acoustic properties of the prepared cement composites, however, at the same time; there was also the expected decrease in the strength characteristics due to the elasticity of rubber.
Towards the end of the 20th century there was a huge boom in the development of solar energy, which led to an increase in the production of photovoltaic panels. The producers assume a lifetime of these panels of 30 years. Today, the life of this photovoltaic panels is ending and a large amount of waste is associated with it. This issue is also addressed by the Council of the European Union, which issued Directive 2012/19/EU on waste electrical and electronic equipment. Photovoltaic panels are included in IV. category “Consumer electronics and photovoltaic panels”. This Directive mandates that at least 70% of photovoltaic panel materials must be reused or recycled. This paper presents a review of the current trends in recycling of photovoltaic panels and the possibilities of reuse in cement matrix.
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