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IRJET - Influence of CRMB in SMA by using Coir Fibre – An Experimental Analysis
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 59 INFLUENCE OF CRMB IN SMA BY USING COIR FIBRE – AN EXPERIMENTAL ANALYSIS M. Praba1, Somesh K2, Sivasaran SD3 1Assistant Professor, Department of Civil Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamilnadu, India 2UG Student, Civil Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamilnadu, India 3UG Student, Civil Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamilnadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------- ABSTRACT- The used rubber obtained from the tyres (Crumb Rubber) of vehicles are playing a vital role in the construction of pavement in recent years. Crumb rubber modification has been proven to enhance the properties ofbitumen. StoneMasticAsphalt (SMA) is a dense wearing course material used as a road surface mix to overcome the issue of rutting due to the action of studded tyres on road surfaces. The mineral aggregate skeleton of SMA is gap-graded and the voids arefilledwithmasticoffineaggregate, filler, binder and fibre. In this project, coir fibre is adopted in SMA.This project looks at some of the international standards for replacing Crumb Rubber Modified Bitumen (CRMB) in Stone Mastic Asphalt (SMA) pavement and finds the difference in performance of pavement construction. Here, the idea of Crumb RubberModifiedBitumeninStoneMasticAsphalt isanewconcept in pavement history an attempt has been made to use Crumb Rubber Modified Bitumen for hot climatic conditions. Marshall Method of bituminous mix design was carried out for different percentages of Crumb RubberandcoirfibreinGrade-55bitumento determine the different characteristics of mix design. According to the results we obtained, the application of Crumb Rubber Modified Bitumen (CRMB) with Stone Mastic Asphalt (SMA) shows better stability and thus it leads to great performance over other conventional bitumen. Keywords: CRMB, SMA, Coir Fiber, Marshall Stability 1. INTRODUCTION Waste tyres are one of the largest most problematic sources of waste around theworld,especiallyinourcountry. The availability of scrap tyres at the international level is exceeding rapidly. Annually 300 million tons of scrap tyres areproduced worldwide. Proper utilization of scrap tyres in the flexible pavements can promise reduction in the stock of scrap tyres nationally. Tyres are not desired at landfills, due to their large volumes and 75% void space will consume more space. Crumb Rubber ModifiedBitumen(CRMB)ismanufacturedusingfinelypowderedscraptyrerubberandprocessedina sophisticated reactor at high temperature. The application of CRMB in Stone Mastic Asphalt (SMA) will improve the performance of the pavements strength, elasticity and other beneficial properties to make it better able to withstand high traffic loads, extreme weather conditions and the other forms of stress and also provide low maintenance. Stone Mastic Asphalt (SMA), otherwise known as Stone Matrix Asphalt is a premium quality bituminous wearing course material having excellent durability and performance properties. Itischaracterizedbya stone-on-stonestructure.SMA uses a high proportion of larger stones or aggregate that contacts each other. This skeleton of larger stones resists heavyloads by transmitting them to the pavement below. If the under laying pavement is sufficiently strong then the SMA will resist the heavier loads effectively. The mastic is intended to hold the aggregate in place and to inhibit the ingress of moisture into the pavement and to provide durability. The mastic consists of bitumen and fine aggregate particles; it also includes modified bitumen and filler material to increase the mastic strength. Fibres are also added to stabilize the bitumen and to prevent the binder segregating from the aggregate during transport and placement. It is important that the aggregate material consist of only the larger stones (in the structure) and fines to provide effective mastic. 2. NEED FOR STUDY • Crumb Rubber Modified Bitumen (CRMB) will lead to Minimization of Environmental Pollution caused by burning of tyre and disposing in landfills and thereby protecting it. • Stone Mastic Asphalt has proved superior on heavily trafficked roads and industrial applications with high lorry frequency and intense wheel tracking. • Stone Mastic Asphalt reduces noise emissions. The macro texture of this road surface absorbstrafficnoise.Becauseof this property, the surface is very suitable for access roads in residential areas.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 60 • SMA grades laid in thin layers are used extensively for preventive maintenance and road repair purposes. The stone skeleton matrix can accommodate unevenness of the underlying pavement to improve driving comfort. • The idea of Crumb Rubber Modified Bitumen in Stone Mastic Asphalt is a new concept in pavementhistoryandthus it leads to great performance over other conventional pavements. 3. LITERATURE REVIEW Ashish Talati and Vaishakha Talati(2014) suggested that SMA is a potential method that can also be used in India especially for high and increasing traffic in India and they have also said that countries like the United Kingdom has already resurfaced its heavy traffic roads with SMA-Type surface. Gite B.E. and Momin Soyal (2013) investigate the benefits of stabilizing SMA mixture in flexible pavement with shredded waste plastic and use of bagasse in SMA. Mishra C. B. and etc [at all] (2014) has accessed the properties of CRMB-55 with and without addition in small doses of Nano-Technology additive to fulfill the basic requirements. Md.Saeed and Md.Rehan (2014) concluded in their thesis that the standard requirement of getting satisfied by replacing the Recycled Coarse Aggregates (RCA) in SMA with high caution on size and percentage of aggregate. Md.Rosli and Haryati Yaacob (2013) concluded that thefatiguelifeofasphaltmixturewas lowerat40°Cthanat 25°C.They also observed that mixtures with smallest nominal maximum aggregate size had a higher fatigue life. Qiu Y.F. and Lum K.M. (2016) concluded that SMA mixtures having stone-to-stone contact exhibited excellent rutting characteristics. They also indicated that positive correlation existed between the rutting from wheel tracking tests. Suhana Koting and etc. [at all] (2013) concluded that CRMB improves the property of bitumen by increasing the storage and loss modulus and enhancing the high and low temperature susceptibility. 4. METHODOLOGY The initial stage in solving a crisis is, identifying that there is one, and likewise the first step inresolvingthepavement distress is to identify the problem and its causes. In this case, a methodology to work out the process isframedandgiveninthe figure below as Figure 1. Figure 1: Methodology Chart of the proposed work
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 61 5. PAVEMENT MATERIALS 5.1. Crumb Rubber Modified Bitumen (CRMB) Crumb Rubber Modified Bitumen (CRMB) is a binder obtained through physical and chemical reaction of Crumb Rubber (produced by recycling of used tyres) with bitumen and specific additives. CRMB is generally composed of 25% of Natural Rubber, 75% of Waste Tyre Crumb. The use of alternative materials for bitumen such as Crumb Rubber Modified Bitumen (CRMB), it will definitely be environmentally beneficial, and not only it can improve the bitumen binder properties and durability, but it also has a potential to be cost effective. Various studies are being carried out to improvetheperformance of the bitumen used for road construction. One of the results such studies introduces Crumb Rubber Modified Bitumen (CRMB).The Crumb Rubber Modified Bitumen shows better properties forpavement constructionlikefriction,skidresistance, durability, maintenance cost, noise generation, load carrying capacity, etc., It is durable and economical solution for new construction and maintenance of wearing courses. 5.2. Aggregates The aggregates used for flexible pavements include crushed stone, gravel and sand.TheseaggregatesmustsatisfyIRC specifications for the constructional purposes. The aggregates must be strong and durable. In order to select the best class of aggregates we need to carry out different tests. 5.3. Coir Fibre Coir, or coconut fibre, is a natural fibre extracted from outer husk of coconut and used in products such as floor mats, doormats, brushes and mattresses. Coir is the fibrous material found between the hard, internal shell and the outer coat of a coconut. Other uses of brown coir (made from ripe coconut) are in upholstery padding, sacking and horticulture. White coir, harvested from unripe coconuts, is used for making finer brushes, string, rope and fishing nets. It has the advantage of not sinking, so can be used in long lengths on deep water. This fibre is so strong that it can be used as ropes which can carry very heavy weights. In our project, we have adopted brown coir of length 5 mm. 6. EXPERIMENTAL TESTING AND ANALYSIS Pavement material analysis is an important factor for cost efficient, durable and safe transportation system.Through the analysis process only we came to know about the characteristics of the pavement materials in terms of quality. 6.1. Bitumen Test The method used for testing the bitumen IS: 1203-1209-1978. The following tests are done and the results are obtained. Penetration value of crumbed rubber modified bitumenis45mm,softening pointcrumbed rubberModifiedbitumen is 55◦c respectively, Ductility value of crumbed rubber modified bitumen is 59 cm. Bitumen test result shown in table 1. Table-1: Results obtained on conducting various tests on CRMB S. No. Description of Test Unit Specification limit as per IS : 15462-2004 Results obtained for CRMB 1 Penetration value mm <60 mm 45 mm 2 Softening point °C 51°C- 59°C 55°C 3 Flash point & Fire point °C Min- 220°C 240°C & 430°C 4. Ductility(25°C) cm >55 cm 59 cm The above Table-1 shows the results of various tests conducted on CRMB and the result shows that the CRMB can be used for laying surface coarse.(As per IS:15462-2004) 6.2. Aggregate Test The method used for testing the aggregate is IS-2386 (P1 – P4). The following tests are done and the results are obtained. Impact value test – 14.3%, Flakiness and Elongation index test – 21.9% & 29.53%, Los Angeles Abrasion test- 21%, Water Absorption test – 1.1%.Aggregate test results shown in table 2.
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 62 Table-2: Results obtained on conducting various tests on the coarse aggregate Sl. No. Description Of Test Specification As Per MORTH Table (500-35) Test Method Test Result 1. Aggregate Impact Value (%) < 18 % IS-2386 (P 4) 14.3 % 2. Los Angeles Abrasion (%) < 25% IS-2386 (P 4) 21 % 3. Flakiness And Elongation Indices < 40% IS:2386 (P 1) 21.9 % & 29.53 % 4 Water absorption Test <2% IS:2386 1.1% As shown in Table-2, the result of the various tests on aggregate shows that the aggregates can be used for laying surface coarse. (As per IS: 2386). 6.3. Marshall Mix Design The samples are tested with different proportions which have various amounts of fibre content of 0.4%, 0.5% and 0.6%. The mix design that we adapted by using MORTH specification is shown in table-3. Table-3: Marshall mix design of SMA-CRMB mix S.NO SIZE OF AGGREGATE (mm) WEIGHT OF AGGREGATE IN GRAMS FOR 1200 MIX AT BINDER CONTENT 6.5% 7% 7.5% 1. 13.2 60 60 60 2. 9.5 390 390 390 3. 4.75 462 462 462 4. 2.36 48 48 48 5. 1.18 36 36 36 6. 0.6 24 24 24 7. 0.3 42 36 30 8. 0.075 60 60 60 9. Binder content 78 84 90 Total 1200 1200 1200 6.4. Marshall Test Results and Analysis Table-4: Stability values of conventional specimens for respective CRMB contents Bitumen content 6.5% 7% 7.5% Stability value 952 kg 1079 kg 937 kg Flow value 3.72 mm 3.96 mm 4.25 mm
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 63 conventional mix On examining figures 2 and 3 it is observed that, the stability value of the samples peaks atbitumencontentof7%and decreases in the samples with bitumen content of 7.5%. However, the flow value increases gradually with the increase in bitumen content. Table-5: Stability values of 0.4% coir fibre specimens for respective CRMB contents Bitumen content 6.5% 7% 7.5% Stability value 1121 kg 1208 kg 1096 kg Flow value 3.69 mm 3.83 mm 4.06 mm Figure-4: Change in stability value for 0.4%coir Figure-5: Change in flow value for 0.5%coir On examining figures 4 and 5 it is noticed that, the samples exhibits the same behavior as the conventional mix since the stability value of the samples peaks at bitumen content of 7% and decreases in the samples with bitumen content of 7.5%. However, the flow value increases gradually with the increase in bitumen content. Table-6: Stability values of 0.5% coir fibre specimens for respective CRMB contents Bitumen content 6.5% 7% 7.5% Stability value 1156 kg 1327 kg 1145 kg Flow value 3.66 mm 3.89 mm 4.38 mm Figure-2: Change in stability value for Figure-3:Change in flow value for conventional mix
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 64 Figure-6: Change in stability value for 0.5% coir Figure-7: Change in flow value for 0.5% coir On examining figures 6 and 7 it is noticed that, the samples exhibits the same behavior as the conventional mix since the stability value of the samples peaks at bitumen content of 7% and decrease in the samples with bitumen content of 7.5%. However, the flow value increases gradually with the increase in bitumen content. Table-7: Stability values of 0.6% coir fibre specimens for respective CRMB contents Bitumen content 6.5% 7% 7.5% Stability value 1212 kg 1470 kg 1087 kg Flow value 3.76 mm 3.98 mm 3.86 mm Figure-8: Change in stability value for 0.6%coir Figure-9: Change in flow value for 0.6 %coir On examining figures 8 and 9 it is observed that, the stability value of the samples peaks atbitumencontentof7%and decreases in the samples with bitumen content of 7.5%. Also, it is seen that the flow value drops at the bitumen content of 7.5%. From the above results, we can infer that, comparatively among the three proportions, SMA – CRMB with 0.6% fibre gives the best result. Much greater stability of 1470 kg is obtained when only 0.6% of fibre is being used. Conclusively, it is found that 7% is optimum for this proportion. Also, the samples start losing their stability from the bitumen content of 7.5%. 7. CONCLUSIONS By analyzing the test results from the laboratory, Crumb Rubber Modified Bitumen (CRMB) introduced with Stone Mastic Asphalt (SMA) it is concluded that this method was comparatively more stable than the conventional method. Stability is improved by adding Crumb Rubber Modified Bitumen (CRMB) binders to Stone Mastic Asphalt (SMA) as better adhesion is developed. In comparison to the conventional mix overSMAintroduced withCRMB,thevaluesofMarshall Stability were generally higher. When compared, the most appropriate amount of the added CRMB was foundto be7%byweightof bitumen with 0.6%ofCoir Fibre in SMA results are in the maximum level of stability and flow.
7.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 65 Also, the Flow value of 3.98 mm is obtained with the CRMB content of 7% and coir fibre of 0.6% which is acceptable for a CRMB-SMA mix. REFERENCES [1] Nabin Rana Magar, “A Study on the Performance ofCrumbRubberModifiedBitumenbyVaryingtheSizesofCrumb Rubber”, International Journal of EngineeringTrendsand Technology(IJETT)– Volume14Number2– Aug2014,Page 51. [2] Siti Khatijah Abu Bakar, Mohd Ezree Abdullah, Mazlina Mustafa Kamal2 , Raha Abd Rahman, Rosnawati Buhari, Ramadhansyah Putra Jaya, Suryati Sabri and Kabiru AbdullahiAhmad,“Theeffectofcrumbrubberonthephysical and rheological properties of modified binder” IOP Conf. Series: Journal of Physics: Conf. Series 1049 (2018) 012099. [3] Nuha Salim Mashaan, Asim H.Ali, Suhana Koting and Mohammed Rehan Karim, “Dynamic Properties and Fatigue Life of Stone Mastic Asphalt Mixtures Reinforced withWasteTyreRubber”,Hindawi PublishingCorporationAdvances in Materials Science and Engineering Volume2013,Article ID 319259,9pages. [4] Nuha Salim Mashaan, Mohamed Rehan Karim, Mahrez Abdel Aziz, Mohd Rasdan Ibrahim, Herda Yati Katman, and Suhana Koting, “Evaluation of Fatigue Life of CRM-ReinforcedSMAandItsRelationship toDynamicStiffness”,Hindawi Publishing Corporation Scientific World Journal Volume 2014, Article ID 968075, 11 pages. [5] Hanumantharao.C, Anil Pradhyumna.T., Durga Prasad.K ,NaveenKumar.N, Shantha Kumar Reddy.G , Hemanth Vardhan.M , “Crumb Rubber Modified Bitumen and Quarry Dust in Flexible Pavements”, International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8, Issue-1, May 2019. [6] B.Sudharshan Reddy, N.Venkata Hussain Reddy, “Performance Evaluation of Crumb Rubber Modified Bitumenby Using Various Sizes of Crumb Rubber”, International Journal for Research in Applied Science & Engineering Technology (IJRASET) , Volume 4 Issue III, March 2016. [7] Mohd Rasdan Ibrahim, Herda Yati Katman, Mohamed RehanKarim,SuhanaKoting andNuha S.Mashaan,“AReview on the Effect of Crumb Rubber Addition to the Rheology of Crumb Rubber Modified Bitumen”, Hindawi Publishing Corporation Advances in Materials Science and Engineering Volume2013, Article ID 415246, 8 pages. [8] Praba M, K. Lokeshwaran, S.Ranjith Kumar , “AN OPTIMUM DESIGN APPROACHFORFLEXIBLEPAVEMENTUSING ASPHALT INSTITUTE METHOD”, 2020, International Journal ofCivil EngineeringandTechnology(IJCIET),Volume 11, Issue 03, March 2020, pp. 146-157, Article ID: IJCIET_11_03_016. [9] Vishal Rasal, L Nokfho K, P. M. Wale, Mrunalini Kasar, Anjali Thorat, Raunak Solanki, Ishan Dharmadhikari (2018) “Experimental Study on Modified Bituminous Mix Using Waste High Density Polyethylene And Crumb Rubber” International Journal of Innovative Research in Science, Engineering and Technology, Volume 7, Issue 5, ISSN- 2319- 8753. [10] K.S.Dhivya, P.Vidhubala,S.Rajalakshmi,S.Vikramathithan,“IMPROVEMENTOF BITUMEN PERFORMANCEUSING CRUMB RUBBER AND RECYCLED GLASS POWDER”, International Research Journal of Engineering and Technology (IRJET) ,Volume: 04 Issue: 12 | Dec-2017 | Page 169. [11] A Setyawan, S K Nugroho, A M Irsyad, H F Mutaqo, P Ramadhan, A Sumarsono, F P Pramesti , “The use of Crumb Rubber as Substitute of Fine Aggregate for Hot Asphalt Mixture using Polymer Modified Bitumen” , IOP Conf. Series: Materials Science and Engineering 333 (2018). [12] Praba M, Dr.J. Samuel Simron Rajkumar J, Dr.S. Nandhakumar, 2020,“STUDYON GREEN ROADSBASEDON COLD MIX ASPHALT – AN INVESTIGATORY APPROACH” , International Journal ofCivil EngineeringandTechnology(IJCIET), Volume 11, Issue 03, March 2020, pg. 158-168, Article ID: IJCIET_11_03_017. [13] Code Book: IS: 1203-1209-1978, IS: 15462-2004, IS-2386, MORTH specification.
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