International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 03 | Mar 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 920 FLEXURAL BEHAVIOUR ON FIBER REINFORCED BUBBLE DECK BEAM WITH RECYCLED AGGREGATE G.Viswanathan 1 , P.Abirami 2 , S.Atchaya 3 , S.Dharani 4 , M.Kowsalya 5 1 Assistant professor, Dept. of Civil Engineering, Vivekanandha College of Technology for women, Tamilnadu, India 2,3,4,5 UG Students, Dept. of Civil Engineering, Vivekanandha College of Technology for women, Tamilnadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - At current situation, a serious problems faced by construction industry is exhaustive use of the raw materials. Recent times, the various methods are being adopted to control the use of concrete. In our method, Bubble Deck Beam is a method of virtually eliminates all concretes from the middle of a beam and which is not acting any structure function and thereby slowly reducing structural dead load. Bubble Deck Beam is a beam whose core is replace with spherical balls that can be various sizes and shapes. In the building constructions, the beam is very important structural member to carry a load of the slab. In this project, the in-effective concrete in the centre of the beam is to be replaced with high density polyethylene hollow spheres. Using M30 grade of concrete, number of beams with and without spherical bubbles will be casted to compare the weight and flexural strength. The use of such hollow sphere may results in a reduction of structural self-weight of about 20 to 25 percentage. The concrete above neutral axis in compression zone takes minimum stress so that we could partially replace the concrete using high density polyethylene balls of 70mm diameter. Hence the usage of concrete in beams and self-weight of beams got reduced considerably. The influence of natural coarse aggregates are replaced 100% with recycled coarse aggregate on various mechanical and durability properties of hardened concrete along with the different w/c ratio. In this study, Recron 3s polyester fiber is added to the concrete as 1%, 2%, 3%, & 4% by the weight of fine aggregate in order to improve its performance to find the optimum dosage of Recron 3s Polyester fiber. The flexural strength, compressive strength, modulus of rupture and split tensile strength of M30 grade of concrete will be tested for 7,14 and 28 days of curing and compared with the concrete made with natural coarse aggregate. Some of its major benefits are lower total cost, reduced material use, enhanced structural efficiency, decreased construction time and is green technology. Key Words: Bubble Deck Beam, Neutral axis, HDPE Balls, Light Weight Material, Recron 3s Fiber, Flexural Behaviour, etc., 1. INTRODUCTION Now-a-days construction industry starts to pay a great attention to special material that is used in building construction in terms of their effects on environment. Ordinary Portland Cement (OPC) is one of the main components used in casting reinforced concrete (RC) structures. So the usage of concrete is high now-a-days, and hence there becomes a shortage of raw materials for its preparation. To reduce the usage of concrete many researches were carried out for alternate materials that can be used instead of concrete. By recycling scrap or waste plastic material turn them into useful products, and plastic is non-biodegradable material. By recycling the waste plastic material it can reduce the high rate of plastic pollution. By using this method the concrete is replaced using High Density Polyethylene(HDPE) Balls. These balls are less in weight and when we use these balls, it will not affect geometrical shape of beam. Also it greatly does not affect the strength and stress characteristics of the beam. 2. MATERIALS USED 2.1CEMENT A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. A cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used to manufacture cement includes limestone, shells and chalk combined with shale, clay, slate, blast furnace slag, silica sand and iron ore. The concrete proposed for this task is OPC 53 grade. The properties of bond are resolved to meet the prerequisites of IS 12269- 1987 Specification for 53 grade Ordinary Portland concrete Table -1: Properties of cement S.NO PROPERTY VALUE 1. Specific gravity 3.14 2. Consistency 33% 3. Initial setting time 30min 4. Final setting time 300min