Browsing by Author "Bederina, M."

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    Effect of marble powder on the properties of self-compacting sand concrete
    (2011) Bouziani, T.; Benmounah, A.; Bederina, M.; Lamara, M.
    Self-compacting sand concrete (SCSC) can be regarded as a flowing sand concrete, containing as principal aggregate natural sand, which can be cast without compaction or vibration. Due to the finesses of aggregates in SCSC, it requires a high amount of fine materials than other types of concretes. This paper studies the effect of marble powder content (MP) on the properties of the sand concrete (SCSC) at fresh and hardened states. The properties of the fresh prepared mixes tested are the mini-slump flow, the V-funnel flow time and viscosity. At the hardened state, the parameter which has been determined is the 28-day compressive strength. The obtained test results show that the increase of MP content in SCSC, from 150 kg/m3 to 350 kg/m3, improves the properties at fresh state by decreasing v-funnel flow time (from 5s to 1.5s) and increasing the mini-cone slump (from 28cm to 34cm). With the use of 250 kg/m3 of MP we can reach the highest initial viscosity while retaining good fluidity at high rotational speeds, compared to the MP contents of 150 kg/m3 and 350 kg/m3. In other hand, the 28-days compressive strength decreases with an increase of MP content
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    Study of the acoustical and thermo-mechanical properties of dune and river sand concretes containing recycled plastic aggregates
    (Elsevier Ltd, 2020) Boucedra, A.; Bederina, M.; Ghernouti, Y.
    The main objective of this work is the development of a new sand concrete whose aggregates consist only of river (0/4 mm) or dune (0/63 mm) sand and recycled plastic aggregates (0/3.15 mm). The work has both ecological and economical interest, without forgetting the technological interest which can certain materials provide. Indeed, what is new in our case is the addition of plastic aggregates to sand concrete as well as the study of the acoustic properties of this material. Different compositions have been studied by replacing (in volume) the mineral sand with plastic aggregates. The envisaged proportions are: 0%, 25%, 50% and 75%. The work focused mainly on the study of the effect of the addition of plastic aggregates on the properties of the river sand concrete and dune sand concrete, such as the thermo-mechanical properties and microstructure, with particular emphasis on studying the acoustic properties. The results obtained showed that, although the compressive strength of the studied composites is slightly reduced, their qualities in thermal insulation and acoustics absorption are significantly improved. For substitutions of up 75%, the sound absorption coefficient and the noise reduction coefficient (NRCs) ranged between 0.15 and 0.6 and between 0.28 and 0.39 respectively. Based on the obtained results, the final product is a lightweight concrete which can be classified, according to ISO 11654, into the sound absorption classes D and E. It is able to integrate among the new building materials and to contribute to sustainable development, particularly in local construction (arid regions). In conclusion, the recycled plastic waste and the dune sand can be a suitable alternative to the classic building materials