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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6053 Utilization of Recycled Concrete Aggregate for New Construction Mohan Kumar1, Ravi Shankar Prasad2, Vishal Kumar3, Prof. Mayank Nigam4 1,2,3Under Graduate student , ABES Institute of Technology, Vijay Nagar,Ghaziabad-201009 4Assistant Professor, ABES Institute of Technology, Vijay Nagar, Ghaziabad-201009 1,2,3,4Department of Civil Engineering, ABESIT, Uttar Pradesh, INDIA ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Crushing the demolished concrete to produce coarse aggregate for the production of new concrete is one common means for achieving a more eco-friendly/sustainable concrete in addition to the reduction in valuable landfillspace and use of natural resources. The use of recycled concrete aggregate (RCA) in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for virgin aggregate. In this project we use recycled concrete aggregate as coarse aggregate (about 90% crushed stone aggregates, 8% brick aggregates and 2% tile aggregates) and natural aggregate of approximate size 20mm for Physical and Mechanical properties test. The Results were compared and discussed in this project. The compressive strength tests are performed on concrete cube by partial replacementofnatural coarse aggregate with recycled coarse aggregate .Cubes were casted by replacing natural coarse aggregate with 25%,50% and 100% recycled coarse aggregates. The concretecubesare designed for M20 as per Indian Standard codes. Key Words: Recycled Coarse aggregates, Natural Coarse aggregates, recycled brick aggregates, compressive strength, comparison 1. INTRODUCTION As urbanization is increasing over time, the demand fornew building and infrastructure has sharply risen. The existing old buildings are demolished to make way for new modern ones based on the need. Due to modernization, demolished materials are dumped on land & not used for any purpose .Such situations affect the fertility of land. As per report of Central Pollution Control Board (CPCB) Delhi, in India, 48 million tons solid waste is produced out of which 14.5 million ton waste is produced from the construction waste sector, out of which only 3% waste is used for embankment. It is anticipated that there will be an increase in the amount of concrete waste, a shortage of disposal sites, and depletion in natural resources especially. These lead to the use of recycled aggregate in new concrete production, which is deemed to be a more effective utilization of concrete waste. As we know that concrete is the main construction material across the world and the mostly used in all types of civil engineering works. As aggregate represents about 70-80% of concrete components so it will be beneficial to recycle the aggregate for construction works and also to solve the environmental problems. To minimizetheproblemofexcess of waste material it is a good step to utilize the recycled aggregates provide that the desired final product will meet the standards. TheCost of Recycled Concrete Aggregatemay be less than 20 to 30 % less than natural aggregate in some regions. By using the recycled aggregate the consumption of natural aggregate can be reduced. Theraw materials usedin the production of recycled aggregatescomefromdemolition of pavements and buildings. This material is broken into large pieces and transported to the processing plant. It must be clean, free of contaminants like steel reinforcing bars, wood and soil. Then it passes through three main phases crushing, sizing and blending. The processes of recycling of construction and demolition wastes are similar to those producing natural aggregate both have the same equipments, crushers, screens, removal impurities and transportation facilities. 1.1 BENEFITS OF USING RECYCLED COARSE AGGREGATES There are many economic,environmental andsocial benefits to using recycled aggregates. Cost Saving Making use of recycled aggregates over virgin materials can save money as they are less expensive to produce. If recycled materials are available locally then this can reduce the cost of transporting the aggregates. Producing recycled aggregate for resale is more cost- effective than sending un-wanted materials to landfill and incurring landfill tax. Eco-Friendly Recycled Aggregate is regarded to be a ‘green’ construction material. Using recycled aggregate reduces the amount of virgin aggregates which arecreatedandtherefore means less use of natural resources. Versatile Recycled aggregates can be used for various different functions, suitable for use with construction projects, landscaping and in home improvement applications
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6054 1.2 OBJECTIVES I. To reduce the environmental pollution as well as providing an economic value for the waste material by the use of recycled concrete aggregate in construction. II. To compare the physical and mechanical properties of Recycled coarse aggregates and Natural coarse aggregates. III. To determine the compressive strength of concrete by partial replacement of Natural coarse aggregateswithRecycled coarse aggregates. 2. MATERIAL USED 2.1 Cement Ordinary Portland Cement (OPC) 43-grade confirming to IS: 8112-1989 is available in the market and it was used in the present studies. Table 1: Properties of cement PROPERTY VALUE Specific Gravity 3.14 Fineness 328 (m^2/kg) Consistency 34 Initial Setting time(Minutes) 52 Final setting time (Minutes) 258 2.2 Fine Aggregate Locally available river sand is used in this project with specific gravity 2.48. 2.3 Natural Coarse Aggregates For this project, natural coarse aggregatesareobtainedfrom local supplier. The size of coarse aggregate is approax 20 mm. Table 2: Properties of Natural Coarse aggregates PROPERTY VALUE Max.Aggregate Size 12.5mm Water Absorption 1.31% Fineness Modulus 7.14 Specific Gravity 2.6 Impact value 17.53% 2.4 Recycled Coarse Aggregates For this project, recycled coarse aggregates are obtained from IL&FS Burari Plant New Delhi. These recycled coarse aggregates are obtained from crushed concrete and it consists of about 90% stone aggregates and 10 % brick aggregates. The size of recycledcoarseaggregatesisapproax 20 mm. Fig. 1: Recycled coarse aggregates Table 3: Properties of Recycled coarse aggregates PROPERTY VALUE Max.Aggregate size 12.5mm Water Absorption 5.64% Fineness Modulus 7.84 Specific Gravity 1.88 Impact Value 21.83% 2.5 Water Fresh and clean water is used for casting and curing of specimen. The water is relatively free from organic matters, silt, oil, sugar, chloride and acidic material as per requirements of Indian standard. Combining water with a cementitious material forms a cement paste by the process of hydration. 3. METHODOLGY A mix M20 grade of concrete is used as per IS 456:2000.Mix proportion adopted is cement, fine aggregate and coarse aggregate (Recycled and natural) in ratio 1:1.5:3.Water- cement ratio was taken 0.50.The cubes are made in the percentage of 25%,50%and 100%ofreplacementofnatural aggregates. That means that in the first case we have taken 25% recycled aggregates and 75% natural aggregates. In second case we have taken 50% natural and 50% recycled aggregates. In third case we have taken 100% of recycled
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6055 aggregates. In Fourth case we have taken 100% of Natural aggregates. And thus we have performed the compressive strength tests on these 4 sets of concrete cube at the age of 7 days and 28 days curing. The replacement is done as per volume. That means the volume of recycled coarse aggregates is matched with the volume of Natural coarse aggregates. 4. TESTING 4.1. Compressive Strength Compression test is the most common test to be conducted on hardened concrete, because most of the properties of concrete are qualitatively related to its compressive strength. The compression test was carried out as per IS 516:1959 using compression testing machine. A total of 24 concrete cubes of size 150 mm * 150mm * 150mm were tested for compressive strength at curing periods 7 and 28 days. The average value of three specimens was taken as the compressive strength of the concrete. The loading rate on the cube is 140 N/mm2 per min. The comparative studies were made on their characteristics for concrete mix ratio of 1:1.5:3 with partial replacement of natural aggregatewith recycled aggregates as25%,50%and 100%. Table 4: Partial and Full Replacement of Natural & Recycled coarse aggregates Sample No. Replacement of coarse aggregate Compressive Strength Test(N/mm2) 1 25% (RCA) 23.18 28.29 2 50% (RCA) 25.03 32.58 3 100% (RCA) 22.81 23.11 4 100% (NCA) 18.07 27.40 0 10 20 30 40 Compressive strength(MPa) % of Replacement of coarse aggregate 7 Days 28 Days GRAPH 1: Comparison on compressive strength of cube by partial and full replacement of Natural and recycled coarse aggregates The results show that cube compressivestrengthof recycled aggregate concrete has more compressive strength than natural aggregate concrete. This is due to stiff bond between cement and recycled brick and stone aggregate, since brick aggregate has rough texture ensuring better bondthanstone aggregate with binding material. This can be attributed to the cement mortar coat of recycled coarse aggregate participate in hydration process and contribute additional strength. It is observed that the recycled coarse aggregate concrete at 50% of RCA attained more strength. 5. CONCLUSION Recyclingand reuseofdemolishedbuildingwasteshavebeen found to be an appropriate solution to the problems of dumping hundred of thousands tons of debris accompanied with shortage of natural aggregates. The use of recycled aggregates in concrete proves to be valuable building materials in technical, environment and economical respect. The value of specific gravity of naturalcoarseaggregatemeet the requirement however the Recycled coarse aggregate doesn’t meet the requirement and is lower than the natural coarse aggregate. Then the value of absorption of natural coarse aggregate is lower and recycled coarse aggregate is higher. The value of recycled coarse aggregates with 50% replacement in concrete has the highest compressive strength .Then when 100% replacementofnaturalaggregate has lower compressive strength. Thus, from this result it concluded that the percentage of recycled coarse aggregate that can be used in concreteismaximum50%replacementof natural coarse aggregate. REFERENCES [1]. N V V S S L Shilpa Devi Gadde, P .Mani Kumar, K.Abhiram,(March 2017), “A study on Demolished Concrete by Partial Replacement of Coarse Aggregate” Vol. 6,Issue 9,March 2017 ,ISSN 2277-3754. [2]. Nitin Goyal, Shagun Chaddha and Hitanshu Saini,(2016), “Need of Recycled Concrete Aggregates”, Volume 3(2) ISSN:2394-9333, pp: 324-326. [3]. Preeti Saini, Deepakar Kumar Ashish, (2015),” A review on Recycled concrete aggregates”, pp: 71-75, ISSN: 2348- 8352. [4]. Manish Kumar Singh, Dilip Kumar,(2014),“Physical properties of ConstructionandDemolished wasteconcrete”, vol.2,Issue 08,2014,pp: 122-123,ISSN:2321-0613 [5]. Jitender Sharma, Sandeep Singla (2014), “study of Recycled ConcreteAggregates”,vol.13No.3-Jul 2014,pp:123- 125, ISSN: 2231-5381. [6]. IS: 2386 (Part I) – 1963 Indian standard – “Methods of test for aggregates for concrete - Part I Particle size and shape”, Bureau of Indian standard, 1997, New Delhi
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6056 [7] IS: 2386 (Part III) – 1963 Indian standard – “Methods of test for aggregates for concrete - Part III Specific gravity, density ,voids, absorption and bulking”, Bureau of Indian standard, 1997, New Delhi. [8] IS: 10262:2009 Indian standards – “Concrete mix proportioning -guidelines”,BureauofIndianstandard,1997, New Delhi. [9] IS: 383 – 1970 Indian standard – “Specificationforcoarse and fine aggregates from natural source for concrete”, Bureau of Indian standard, New Delhi, India, 1970. [10] 18. IS: 456 – 2000 “Plain and Reinforcedconcrete-Code of practice”, aggregates from natural source for concrete”, Bureau of Indian standards, New Delhi, India, 1970
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