EXPERIMENTAL INVESTIGATION ON PARTIAL REPLACEMENT OF FINE AGGREGATES BY DEMOLISHED CONCRETE IN THE PRODUCTION OF NORMAL CONCRETE

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1 International Journal of Civil Engineering and Technology (IJCIET) Volume 8, Issue 4, April 2017, pp Article ID: IJCIET_08_04_045 Available online at ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed EXPERIMENTAL INVESTIGATION ON PARTIAL REPLACEMENT OF FINE AGGREGATES BY DEMOLISHED CONCRETE IN THE PRODUCTION OF NORMAL CONCRETE S. Prakash Chandar Assistant Professor, Department of Civil Engineering, SRM University, Kattankulathur, Tamilnadu, India Nitesh Thakur, C. Lokesh Kumar Reddy, B.V.S. Sumanth Babu, T. Surya Prakash Reddy, Kosika SM PG Student, Department of Civil Engineering, SRM University, Kattankulathur, Tamilnadu, India ABSTRACT When we talk about any construction work the main component which comes to our mind is concrete. As we know concrete comprises of cement, fine aggregates, coarse aggregates and water. The easy access to these construction resources has no doubt boosted the construction throughout the world. But the rapid depletion of these resources and increasing cost is emerging as an attention seeking issues. Due to which construction industries are facing crises for the easy availability of these resources but we would like to make prime emphasis on fine aggregates as our research moves that way. At many place digging rivers for sand has been made illegal. So it's becoming a tough job to get river sand at cheap rate.that is why various alternatives is being adopted to counter this problem such as reuse and recycling of construction waste. So keeping all the facets in our mind we begin with our project of reuse of recycled demolished concrete. In this project we replaced fine aggregates with the demolished concrete in the range 0%, 10%, 20%, 30%, 40%, 50% using M25 grade of concrete. Sieve analysis is also performed for recycled demolished concrete and coarse aggregates. The prepared concrete mix is compared and test in terms of compressive strength, tensile strength and flexure test to conventional concrete. The test was performed at 3, 7 and 28 days in order to evaluate the strength properties. Key words: Compressive strength, Split tensile strength, Flexural strength, recycled demolished concrete editor@iaeme.com

2 Experimental Investigation on Partial Replacement of Fine Aggregates by Demolished Concrete in the Production of Normal Concrete Cite this Article: S. Prakash Chandar, Nitesh Thakur, C. Lokesh Kumar Reddy, B.V.S. Sumanth Babu, T. Surya Prakash Reddy and Kosika SM. S. Prakash Chandar, Nitesh Thakur, C. Lokesh Kumar Reddy, B.V.S. Sumanth Babu, T. Surya Prakash Reddy and Kosika SM, International Journal of Civil Engineering and Technology, 8(4), 2017, pp INTRODUCTION As we know that the present world is heavily feeding on concrete at a huge extend that's the reason the demand for the construction aggregates has also increased.so in order to catch up with demand natural resources are reducing at very fast rate so to substitute the resources some recycled resources are used such as demolished concrete Demolished concrete is produced when structure made up of concrete is demolished and then the amount of the waste concrete left after demolition named as demolished concrete. We can use this productive waste in a very beneficial way by doing recycling. As we know recycling and reusing of waste product always proved to be eco-friendly and economic.waste product can add advantage in the construction work if used according to their potential. Demolished concrete are available at various construction sites in huge quantity which are now posing serious problem of disposal. Firstly these materials are only used for the land filling works but now to eradicate the problems such as decreasing natural resources and disposal which poses a serious threat to environment. Now a day these material are being used in the construction work in order to meet the resource requirement. Volume of demolished concrete is increasing because of the following factors: Demolishing of structure for construction of new ones. Destruction of structures due to natural calamities. These are some factors due to which billion tons of waste got produced every year. So the investigation we have conducted is about to evaluate the compatibility of productive waste (DEMOLISHED CONCRETE) in concrete production. 2. MATERIAL USED Cement: Ordinary Portland cement (grade 43) is used for this experimental study for chemical properties it is taken from IS 8112(1989) and physical properties are in following table 1. Table-1 Physical properties of cement Fineness(m2/kg) 3.15 Specific gravity 3.1 Density (kg/m3) 3.02 Fine Aggregates: As per IS 383 requirements river sand is used as fine aggregate.the fine aggregate portion is below 4.75mm to 150 microns. The locally available natural fine aggregate which its density 1600 kg/m3, fineness modulus of 5.02 and the specific gravity is The fine aggregate is conforming to zone 4 as per IS 383:1970. Coarse Aggregate: AS per IS 383 requirements crushed basalt rock is used. The course aggregate portion ranges from 20mm to 4.75mm. The course aggregate having density 1550kg/m3, fineness modules of 3.04 was used and 2.69 as specific gravity editor@iaeme.com

3 S. Prakash Chandar, Nitesh Thakur, C. Lokesh Kumar Reddy, B.V.S. Sumanth Babu, T. Surya Prakash Reddy and Kosika SM Water: Generally, normal drinking water satisfactory for using in concrete. The water is taken from the sources like lakes, streams. However we take the samples and tests are done to satisfactory the requirements. Water quality which can be used in mixing and curing shall comply with IS. Demolished Concrete: The demolished concrete is taken and brought to the lab and hammered with 10kg of weight and then it is sieved through 4.75mm size and used in the replacement in the fine aggregates. 3. TESTS 3.1. Compressive Strength The internal resisting force to the load applied called compressive strength. (CTM) Compression testing machine is used for testing the cube strength. Concrete cubes were casted for the standard size of (150mm 150mm 150mm) for M25 grade of concrete and strength is calculated for 3, 7, 28 days.the result obtained are as follows in table 2. Figure 1.1 Empty cubes Figure 1.2 Casted cubes Figure 1.3 Demoded cubes Figure 1.4 Curing of cubes

4 Experimental Investigation on Partial Replacement of Fine Aggregates by Demolished Concrete in the Production of Normal Concrete Figure 1.5 Testing on cube Table 2 Compressive Strength S.NO Concrete type Compressive strength N/mm² 3 day 7 day 28 day 1. 0 % replacement % replacement % replacement % replacement % replacement % replacement COMPRESSIVE STRENGTH 3 day 7 day 28 day COMPRESSIVE STRENGTH (N/MM²) % 2 0 % 4 0 % 6 0 % 8 0 % % % REPLACEMENT Figure 1.6 Compressive strength of cubes editor@iaeme.com

5 S. Prakash Chandar, Nitesh Thakur, C. Lokesh Kumar Reddy, B.V.S. Sumanth Babu, T. Surya Prakash Reddy and Kosika SM 3.2. Split Tensile Strength Molded cylinders of size (300mm height and 150mm diameter) are used for casting cylindrical concrete samples. Compressive load were applied dramatically along the length of the sample until it reaches its failure. Then the results were compared between conventional concrete and the replaced recycled demolished concrete in the duration of 3, 7, 28 days at the replacement of 0%, 20%, 40%, 60%, 80%.The result obtained are as follows in table 3. Figure 2.1 Empty cylinder Figure 2.2 Casted cylinder Figure 2.3 Demoded cylinder Figure 2.4 Curing of cylinder Figure 2.5 Testing on cylinder

6 Experimental Investigation on Partial Replacement of Fine Aggregates by Demolished Concrete in the Production of Normal Concrete Table 3 Split tensile strength S.NO Concrete type Split tensile strength N/mm² 3 day 7 day 28 day 1. 0 % replacement % replacement % replacement % replacement % replacement SPLIT TENSILE STRENGTH 3 day 7 day 28 day TENSILE STRENGTH (N/MM²) % 2 0 % 4 0 % 6 0 % 8 0 % % REPLACEMENT Figure 2.5 Split Tensile strength of cylinders 3.3. Flexural Strength In order to investigate the true behavior of the concrete it s important to test reinforced beam. The beam will fail after reach its maximum capacity to take load. This can be observed by testing the beam with two point loading and deflection can also be measured by placing deflect meters at the bottom of the beam. The wooden molds of size 1500mm 150mm 230mm are used for the casting of the beams.10mm bars are used for the reinforcement and 6mm bars used as stirrups with a spacing of 150 mm c/c Figure 3.1 Schematic loading diagram (mm) editor@iaeme.com

7 S. Prakash Chandar, Nitesh Thakur, C. Lokesh Kumar Reddy, B.V.S. Sumanth Babu, T. Surya Prakash Reddy and Kosika SM Table 4 Flexural strength S.NO Concrete type Breaking load (tons) Max. Deflection (mm) 1. 0% replacement % replacement % replacement % replacement % replacement CONCLUSION From this research we conclude that: Figure 3.2 Flexural strength of beam The replacement of recycled demolished concrete can be optimized as a fine aggregate in the concrete. Strength properties linearly decreased in comparison to conventional concrete at the replacement of 0%, 20%, 40%, 60%, 80%, and 100%. Replacement is done up to 100% but up to 80% replacement is more suitable for replacement. REFERENCES [1] R M Santamaria & P. Devadas Manohar. Have studied use of hazardous industrial waste in concrete making will lead to greener environment. [2] Hanifi Binici. Have studied the Durability if concrete made with granite and marble as recycle aggregates. [3] II ker Bekir Topcus. Selim Sengel. Has studied the properties of concretes produced with waste concrete aggregate. [4] J.R. Jimenez a, Ayuso a, M. Lopez a, J.M. Fernandez b, J. de Brito. Use of fine recycled aggregates from ceramic waste in masonry mortar manufacturing. [5] Sani D. moriconi G, Fava G, Corinaldesi V. Examined the mechanical behavior of concrete manufactured with recycled aggregate. Waste management 2005;25: editor@iaeme.com

8 Experimental Investigation on Partial Replacement of Fine Aggregates by Demolished Concrete in the Production of Normal Concrete [6] Fredonia 2007, World Construction Aggregates-Industry study with forecast for 2011 and 2016, The Freedonia group, USA. [7] Kurt R (2012) Recycling and Reuse of Building Material, National Pollution Prevention Center for Higher Education. [8] Karin W, Luts BG, Gunter M, Franz GS (2003) Building Material from waste. Materials Transaction 44: editor@iaeme.com