Some Studies on Recycled Aggregate Concrete with and Without Polymer
Buildings are demolished due to various reasons i. e reconstruction for better economic gains, obsolescence due to deterioration on structural performance, natural disasters and war-inflicted damages. The rate of demolition is increasing day by day and at
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SOME STUDIES ON RECYCLED AGGREGATE CONCRETE WITH AND WITHOUT POLYMER G. D. Awchat , N. M. Kanhe Department ofCivil Engineering, G. H Raisoni College ofEngineering Nagpur, Maharashtra 440016, India Buildings are demolished due to various reasons i. e reconstruction for better economic gains, obsolescence due to deterioration on structural performance, natural disasters and war-inflicted damages. The rate of demolition is increasing day by day and at the same time, the cost of dumping is increasing due to non-availability of appropriate site nearby. Besides scarcity of land, other problems associated with the landfill option include their silting; transportation costs, tipping fees and public opposition. Thus, recycling has been gaining wider attention as a viable option for handling of waste concrete. The recycled aggregate concrete is continued for last two decades in India. Polymer modified concrete is finding its application in various fields of construction viz., liquid retaining structures, thin shells, precast wall panels etc. because of improvement in strength and deformation characteristics as compared to normal concrete. From the experimental investigation on recycled aggregate, it is found that strength viz., compressive strength, flexural strength & split tensile strength was increased up to 10%,40% & 35% respectively by adding 7.50% polymer by weight with respect to weight of cement. An attempt is made in this paper to use only 2% of monobond type polymer by weight with respect to weight of cement so as to compare with normal concrete . INTRODUCTION
With an increase in our environmental consciousness, the concrete industry is coming under intense scrutiny and criticism. Many practices within the concrete industry that pose a potential threat to our environment are becoming matters of serious consideration and along with increased consumption, there is also an increase in the amount of waste that concrete societies have to deal with. Waste concrete can be produced from a number of different sources. The most common are demolition projects. Many concrete structures like building, bridges and road are demolished after a period of time into their service life for purposes of replacement or landscape changes. Other sources of waste include, natural disasters like earthquakes, avalanches and tornadoes: human causes like warmed bombing and structural failures. Traditionally, waste concrete has been managed mainly through its land filling and recycling. Land filling has become a major problem, particularly in countries where land is scare. Thus, recycling has gaining wider attention as a viable option for handling of waste concrete.
The recycling ofwaste concrete has other benefits. One ofthe main environmental benefits is the conservation of natural resources, especially in regions where aggregates are scare. If recycling plants are centrally located and easily accessible, transport costs can be substantially minimized. The major penalties for the use of recycled aggregate are their somewhat lower compressive
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