IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 13, Issue 1 Ver. V(Jan. - Feb. 2016), PP 14-20 www.iosrjournals.org DOI: 10.9790/1684-13151420 www.iosrjournals.org 14 | Page A Critical Review on Self Compacting Concrete Using Recycled Coarse Aggregate Prof. Y.V. Akbari 1 , Prof Dr. K.B. Parikh 2, Tejas H. Raviya 3 1 Assistant Professor, civil department, DIET- Rajkot, Gujarat, India 2 Head of Department, Applied Mechanics Department, Gov. Engg. College, Dahod, Gujarat, India 3 PG student, Masters of Structural Engineering, DIET- Rajkot, Gujarat, India Abstract:Thispaperpresentstheinfluenceofdifferentamountsofrecycledcoarseaggregate(RCA)obtainedfromadem olished C a n c e r Ho s p i t a l , L o c a t e d a t R a jk o t , Gu ja r a t ,about50yearsoldonthepropertiesofself- compactingconcrete(SCC)andcomparedtheresultswithnormalvibratedconcrete(NVC)containing100%naturalcoa rseaggregate(NCA).Importantpropertiessuchas physicaland mechanicalpropertiesofnaturalandrecycledaggregatesarecarriedout.NCAispartiallyreplacedwithRCAbyanamou nt10%,20%,30%, 40% and 50%.Theeffectof RCAon thepropertiesof SCCin greenstate(e.g.Slumpflowtest,V- FunneltestandL-BoxTest)and propertiesofconcreteinhardenedstate(e.g.compressivestrength,flexuralstrength,andSplittensileStrength)arestudie d.Themix designwascarriedoutforM30gradeofconcrete.Theexperimentalresultsindicatethatthecompressivestrength,flexural strengthand splittensilestrengthis high than the use of Recycled coarse aggregate and the strength of SCC decreases with an increase in recycled aggregate (RA) replacement ratios. The presentstudyrecommendsSCCmarginally achievesrequired compressive strengthupto30%replacementofRCA. I. Introduction The cement concrete has been very important and best building material for all types of industrial and civil works. After the long years the structure, it will be demolished. The material of demolished structure have to dump somewhere and for that the Freeland should must require. This procedure is very difficult and Time consuming process and for that process we need to pay. To avoid these type of problem we can use that material in concrete. Here we have studied about use of recycled coarse aggregate with Replacement of natural coarse aggregate in Self-compacting concrete. Byresulting the problem of dumping upto certain level of demolished material will solve and the aggregate will not waste. At the congested places or congested reinforcement the concrete will not pass, for that first self- compacting concrete developed in japan in 1988. The self-compacting concrete also denoted as self- consolidation concrete. The main properties of self-compacting concrete is passing ability, filling ability and segregation resistant. The self-compacting concrete is passing in congested formwork and congested reinforcement by its own weight and it have no need of manually or mechanically vibrations. Self-compacting concrete gives a fastrate of concrete placement, with rapidconstruction times andeaseofflowaround congestedreinforcement.ThefluidityandsegregationresistanceofSCCensuresahighlevel ofhomogeneity, minimalconcretevoidsanduniformconcretestrength,providingthepotentialforasuperiorlevelof finishand durabilitytothestructure.Self-Compacting Concreteisoftenproducedwithlowwater- cementratioprovidingthepotentialforhigh earlystrength,earlierremoldingandfasteruseofelementsand structures. The elimination of the Vibration is very useful for the environment, it reduces the time and there is no need of numbers of trained workers. In2002EFNARCpublishedtheir―Specification&GuidelinesforSelf- Compactingconcrete‖which,at thattime,providedstateofthe artinformationforproducersandusers.Sincethen,muchadditionaltechnical informationonSCChasbeenpublished. Material In this study, the materials used are ordinary Portland cement (OPC), fly ash (FA), fine aggregate, Recycled coarse aggregate and superplasticizer. Fine Aggregate utilized in this research as cementations material obtained from Aji Dam, Rajkot, and Gujarat. The typical chemical compositions and some physical properties of OPC and FA are studied. Commercially available Glenium sky 8784 super plasticizer (SP) is used in this research. Natural River and crushed sands were utilized as fine aggregates with maximum size of 4 mm. The values of specific gravity and water absorption are 2.66% and 0.55% for the natural river sand and are 2.45% and 0.92% for the crushed sand, respectively. Particle size gradations and some physical and chemical properties of Recycled aggregates are given in Table 1. RCA was used as coarse aggregate.