Validation of Using Mixed Iron and Plastic Wastes in Concrete
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18-10-2010, 10:20 AM




ABSTRACT
Metals and plastics waste materials create serious environmental problems, mainly owing to the inconsistency of the wastes streams. The purpose of this paper is to evaluate the possibility of using mixed iron filings and granulated plastic waste materials simultaneously to partially substitute the fine aggregate in concrete composites. Type I Portland cement was mixed with the aggregates to produce the concrete composites. Three weight fractions (30, 40, and 50%) of iron filings waste aggregate were used with 5% of granulated plastic waste. The slump, compressive and flexural strengths as well as the fresh and hard density of the concrete mixtures were determined. The results of the mechanical properties were analyzed in comparison to the control specimens. The main findings of this investigation revealed that the mixture of iron filings and plastic waste materials could be used successfully as partial substitutes of sand in concrete composites. Increasing the granulated plastic waste in the mixed aggregate waste materials up to 10% did not seriously hinder the strength properties of the waste-concrete specimens.


INTRODUCTION
One of the main goals of sustainable solid waste management is to maximize the ability of its recycling and reusing. Metal and plastic are the most common of these materials [Hawken 1994]. With increasing environmental pressure to reduce waste pollution, the concrete industry has begun adopting a number of methods to achieve these goals [Sear 2005]. Preserving natural aggregate is a matter of sustainable development to ensure sufficient resources for future generation [Rakshvir and Barai 2006]. Reuse of solid waste as partial replacement of aggregate in construction activities results in reducing the demand for extraction of natural raw materials as well as saving landfill space. The quality of aggregate is highly important since approximately three-quarters of concrete volume are occupied by aggregate; it greatly affects the strength, durability and the structural performance of concrete [Neville and Brooks 1990]. Considering the relevance of some types of solid wastes as recyclable materials that can be reused in concrete industry, much research effort has focused on reusing waste materials from steel and plastic industries to partially replace the aggregate in concrete mixes. Akinmusuru [1991] stated that using a steel slag as an aggregate for concrete mixes have potential in the construction industry.
Soroushian et al. [1995] stated that polypropylene can be used as synthetic fibers to increase the toughness of concrete. Rebeis and Fowler [1996] found that very good flexural strength can be obtained with reinforced polymer concrete using unsaturated polyester resins based on recycled polyethylene terephthalate (PET). Ghailan [2005] stated that concrete mixes made with solid waste produced from iron and steel industry has a higher modulus of rigidity, rebound number and chemical resistance toward the exposure to acids/salts as compared with conventional concrete mixes. Pezzi, et al. [2006] proved that the addition of polymeric materials in fraction 10% in volume inside of a cement matrix does not imply a significant variation of the concrete mechanical features. Marzouk et al. [2007] reported that the plastic bottles shredded into small (PET) particles may be used successfully as sand-substitution aggregates in cementitious concrete composites which appear to offer an attractive low-cost material with consistent properties. Ismail and Al-Hashmi [2008] demonstrated that using waste iron filings as partial replacement of fine aggregate in concrete mixes offers higher strength values than that for the plain mixes. The results of the study carried out by Kou et al. [2009] revealed that the workability, compressive strength, and tensile splitting strength of lightweight aggregate concretes that are prepared with recycled plastic waste were reduced. Very limited studies explored the combined effects of mixed waste materials on the mechanical behavior of concrete mixes. In view of the fact that iron and plastic wastes are widespread types of non-biodegradable solid wastes derived as discarded materials from several industrial processes, the knowledge of their combined influence on the strength properties of concrete is worth to be considered. The current study describes the impact of utilizing mixed iron filings and plastic waste to partially replace sand on the mechanical properties of the waste modified-concrete mixes.


for more details, please visit
claisse.info/2010%20papers/l40.pdf

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09-02-2012, 10:59 AM


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