Preparation and Mechanical Properties of Polyethylene-Portland Cement Composites
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Preparation and Mechanical Properties of Polyethylene-Portland Cement Composites. Rivas-Vázquez L.P.1, Suárez-Orduña R.1, Valera-Zaragoza M.1, Máas-Díaz A. De la L.1and Ramírez-Vargas E.2 1
Universidad del Papaloapan, Campus Loma Bonita, Ferrocarril s/n, Ciudad Universitaria, Loma Bonita 68400, Oaxaca, México 2 Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna Hermosillo No.140, Alpes Norte, Saltillo 25253, Coahuila, México ABSTRACT The effects of waste polyethylene aggregate as admixture agent in Portland cement at different addition polyethylene/cement ratios from 0.0156 to 0.3903 were investigated. The reinforced samples were prepared according the ASTM C 150 Standard (samples of 5 x 5 x 5 cm). The reinforcing fibers were milling at a size of 1/25 in diameter, form waste and used them to evaluate the effects in mechanical properties in cement-based composites. The evaluation of polyethylene as additive was based on results of density and compression tests. The 28-day compressive strength of cement reforced with plastic waste at a replacement polyethylene/cement ratio of 0.0468 was 23.5 MPa compared to the control concrete (7.5 MPa). The density of cement replaced with polyethylene varies from 2.114 (0% polyethylene) to 1.83 g/cm3 by the influence of polyethylene. INTRODUCTION The world of building construction is changing in response to concerns about urban sprawl, resource conservation, and sustainable development [1]. The main objective of a solid waste management system is to effectively safeguard the public health, safety, and welfare. The various options involved in a waste management process are landfilling, incineration and recycling wastes into useful products. Plastics recycling, in particular, would not be successful unless the proper infrastructure to collect the waste is being set, the technology to economically reprocess the waste in to new products is available, and the establishments of markets for the cost-effective use of recycled products are developed. The development of new construction materials using recycled plastics is important to both the construction and the plastics recycling industries [2]. Polymer/cement composites are known to have higher flexural strength, deformability, adhesion, waterproofness and durability than standard cementitious materials [3]. On the other hand, randomly oriented short fibers have been shown to increase tensile strength and retard crack propagation of cement based materials such as fiber reinforced mortars for diverse applications, especially in aggressive enviroments [4]. The proper addition of selected waste materials into concrete can significantly reduce heat loss or improve thermal insulation performance. The degree of improvement in thermal insulation is found to vary with the added waste material and geometry of shredded-pieces [5]. On the other hand, the geometry and size of the plastic material, affect the mechanical strength of material due to changes in the surface area of plastic aggregates. Thus, with additions of plastic below
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