Abstract
The use of plastic waste as coarse aggregates in concrete is part of efforts to reduce environmental pollution. In one hand the use of plastic as aggregates can provide lighter weight of the concrete than concrete using natural aggregates, but on the other hand bond between plastic coarse aggregates and hard matrix give low concrete compressive strength. Improvement of the bond between plastic coarse aggregate and hard matrix through a sand coating to plastic coarse aggregate whole surface is studied. Sand used to coat the plastic aggregates are Merapi volcanic sand which are taken in Magelang. Three mixtures of polypropylene (PP) coarse plastic aggregates, Cimangkok river sand as fine aggregates, water and Portland Cement Composite with a water-cement ratio of 0.28, 0.3 and 0.35 are conducted. Compression test are performed on concrete cylindrical specimens with a diameter of 10 cm and a height of 20 cm. The results in general show that concrete specimens using plastic aggregates coated with sand have higher compressive strength compared to those of concrete specimens using plastic aggregates without sand coating. The bond improvement is indirectly indicated by the betterment of concrete compressive strength.
Highlights
Nowadays lightweight concrete has been used for building materials
In Indonesia according to Indonesia Solid Waste Association (InSWA) total plastic garbage in year 2008 has reached 5.4 million ton per year or 14% from total garbage production
Observation of physical properties of sand from Merapi and Cimangkok was conducted on density, water absorption, granular gradation, and fineness modulus
Summary
Nowadays lightweight concrete has been used for building materials. As lightweight aggregate is part of lightweight concrete, lightweight aggregate can be taken from nature such as pumice, coconut shell, perlite etc, and can be made from fly ash, slag or plastic as example. Until now plastic are used daily by the modern community This phenomenon is due its low production cost, light in weight and relatively easy to form. Transformation of plastic waste into aggregate for concrete making will give benefit for environment and for construction world in view of reducing the own weight of the concrete [3-7]. This effort can be considered as new perspective in research activities in integrating concrete technology and environmental issue. This study covers the development of uncoated and coated plastic coarse aggregate as one of the concrete materials. Volcanic sand is considered having higher SiO2 content compared to river sand which in turn it could expand interface zone between aggregates and mortar [10]
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