In some cases, the production of solid waste is experiencing an uncontrolled and continuous increase, especially wastes from plastic products. Given that the process of transforming plastic waste into raw material involves high energy consumption, plastic can be used in geotechnics. This paper is based on comparing two solutions to improve the soil. The first solution is to improve the soil with plastic waste and the second solution is to improve the soil with cement. An instability phenomenon in slopes occurs in periods with heavy rainfall. For this reason the samples are immersed in water during the direct shear test. Ongoing tests, performed as a part of the research program have shown the effect of the polyethylene waste material and cement on soil cohesion and internal friction angle.
The current trend in the construction design and execution leans toward environmentally friendly solutions. Most of the research activity is oriented by innovations, which lead to unusual combinations of conventional building materials with alternative materials. Such a combination can be obtained by reinforcing earth fillings with plastic materials, in the form of a triangular meshed grid. The earthgeosynthetic aggregate is highly enduring, because the plastic material isn't subjected to environmental conditions that usually facilitate its degradation, thus retains its original flexibility, and effectively acts as a steel bar reinforcement of the reinforced concrete element.
ÖsszefoglalásAz építőipar jelenlegi trendje a környezetbarát megoldások felé hajlik. Aktuális kutatások jelszava az "innováció", aminek közvetlen következménye a klasszikus épitőanyagok szokatlan kombinációja alternatív anyagokkal. Egy ilyen párosítás az alapozási talaj megerősítése műanyagból készült hálószerkezetekkel. A föld-geoszintetikus kombináció kifejezetten tartós megoldás, mert a műanyagot nem érik azon környezeti körülmények amelyek elősegítik az "öregedési" folyamatot, így megtartja eredeti rugalmasságát, és gyakorlatilag úgy működik, akár a vasalás egy vasbeton elemben.Kulcsszavak: háromszög rácsos geoszintetikus háló, véges elem modellezés, Lucas lemez teszt.
Traffic loading on a road surface causes compression in the upper layers of the structure and tension in the lower parts. These lower layers often consist of stabilized soils, for which the tensile characteristics are usually ignored. Tensile stress on the bottom of a stabilized layer should be used as a design criterion, as it is an important design parameter. For stretching tests rectangular soil cement beams of 40x40x160 [mm] (BxHxL) size were prepared. The samples were developed in the Geotechnics laboratory of the Technical University of Cluj-Napoca. This is a first and important step of the research, as these parameters are not treated in any regulations, or standards from Romania.
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