International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | Jul 2023
p-ISSN: 2395-0072
www.irjet.net
Experimental Investigations on Building Demolition Waste Using as a Fine Aggregate in Concrete A.Loganathan1, R.D.Chandiran1, M.Harikaran2 and M.Sanchaya2 1UG Scholar, Department of Civil Engineering, Muthayammal Engineering College, Rasipuram-637408, Tamilnadu, 2Assistant Professor, Department of Civil Engineering, Muthayammal Engineering College, Rasipuram-637408,
Tamilnadu, India ---------------------------------------------------------------------***--------------------------------------------------------------------natural disasters (earthquakes, hurricanes, etc.). The Abstract - Due to continued mining and high transportation
structure was chosen as the primary source of recovered aggregate because it can recycle a considerable volume of broken demolition cement concrete [4]. The test results show that RCAs are around 20% lighter than common aggregates, both coarse and fine. The lower density of the RCAs was due to the older mortar's adhesion to the common aggregates [5]. The initial slump of recycled aggregate concrete was not significantly affected by the relative water absorption of aggregates, but the rate of slump loss increased as the relative water absorption of aggregates increased [6]. The first slump of new concrete somewhat decreased as the replacement amount of recycled particles increased. The initial slump of recycled aggregate concrete was significantly influenced by the moisture content of the aggregates [7]. The compressive strength of concrete using recycled fine aggregate with better absorption was lower than that of the control specimen by 20 to 40%. Relative compressive strength is developed at ages of 1 and 3 days. [8]. The compressive strengths for all combinations after 1, 14, and 28 days of curing show that there is a bigger replacement of recycled aggregates the lower the compressive strength for all curing durations. Both coarse and fine recycled aggregates weaken during compression [9]. The difference between the lower and higher strengths was 7% and 13% for testing ages of 7 days and 90 days, respectively, indicating that the crushing age had a far less significant impact on recycled OPC concrete. The fall in splitting tensile strength brought on by the use of RCAs as opposed to conventional aggregates is more noticeable in a normal-strength-normal-aggregate concrete [10] than the reduction in compressive strength. Recycled concrete aggregates (RCA) cause more concrete to shrink than natural aggregates due to their lower elastic modulus and tendency for shrinkage[11].
costs, the key ingredient in concrete, fine aggregate (river sand), is in short supply, which has become a significant concern for the construction sector. Limiting the abuse of river sand and providing an alternate supply for fine aggregates are the major goals of this research. In this experiment, pulverized concrete from razed structures will take the place of fine aggregates. When correctly disassembled, the concrete from the destroyed building is used as fine aggregate in new concrete. Recycling helps us reduce the quantity of garbage we have to dispose of in landfills. It is a substance that helps the environment and makes it possible to protect natural resources. There are no requirements or regulations for using recycled concrete aggregate in constructions. In this experiment, recycled aggregate was substituted for fine aggregate in a range of ratios, including 0%, 10%, 20%, 30%, 40%, and 50%. Concrete made with recycled aggregates has the potential to store 42% more water. The optimal percentage for replacement concrete is 30% replacement construction debris. When compared to conventional concrete, that 33% replacement concrete is sturdy. Flexural strength is improved by 5.71%, split tensile strength is increased by 0.57%, and compression strength is enhanced by 1%. Key Words: Recycled aggregates, Mechanical properties, Crushed concrete, Fine aggregates
1.INTRODUCTION The world's largest man-made substance is concrete, which is notable. Many recycling techniques for recovered concrete aggregate have been carefully investigated and developed during the past twenty years. These recycling methods limit the amount of waste that is dumped in landfills, cut down on transportation costs, and save raw materials. Construction and demolition, sometimes known as C&D Waste [1], is the process of constructing new structures as well as maintaining and demolishing existing ones. Concrete makes up 40% of the total building demolition garbage, ceramics 30%, plastic 5%, wood 5%, metal 5%, and various combinations 10% [2]. According to a report by Global Insight, rising construction costs would rise by 4800 billion US dollars in 2013. Given that recovered concrete aggregates make up the majority of old concrete, recycling aggregates from demolition trash might close the supply-demand imbalance [3]. Construction trash is produced as a result of
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2. MATERIAL PROPERTIES AND MIX PROPORTIONING 2.1 Cement In the widest sense of the word, cement is a binder—a substance that binds other materials together and sets and hardens on its own. Cement acts as a binder in concrete, holding the other elements together and forming a substantial mass structure. Ordinary Portland Cement (OPC) of grade 43 is the substance used [12].
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