CEL 774 IIT DELHI Construction - RACTICES ( Lecture 1-3) Concrete: Production B. Bhattacharjee CIVIL ENGINEERING DEPARTMENT II T DELHI DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI Gene,a,OUmne ~:~ConcreteProduction. * Pr°d"°°" "'°°ess .,..m..,,_ E,Bhaua¢harjee DEPARTMENT OECIVIL ENGINEERING, HTDELHI ismadebymixingan inorganic material knownascement FineAggregate maybeuncrushedor CoarseAgg. " DEPARTMENTOFCIVILENGINEERING,IITDEpH1 -l\/lostcommon/yusedcementis Ca//edP0rt/and Cementpatentedin 1824inEng/and,whenmixed withWatenyhardens, hencehydrauliccemenf ~:~Basic rawmaterialsusedthemanufacture I ofcemenz arecalciumcarbonate found in/ime 3076 0" aha//sand5//iCa:3Umi3and'70 oxide foundin Clayorshale. B.Bhattacharjee ,, DEPARTMENTOFCIVIL ENGINEERING, IITDELHI AGGREGA TES /Aggregates Cement-sand Mortar Aggregate the skeleton 12% Paste Voids. >Aggregate shall be inert and strong. B. Bhattacharjee OF CIVIL ENGINEERING, matrix 50-75% by volume. 25-40% DEPARTMENT forms IIT DELHI ADA/IIXTURES »:«O/Iemica/Ad7ixzur9:U59O Property/performanceenhancement. ':'Mineral AdmiXlure: Used forimprovement of/Unatermstrenath anddurability >using aboveadmixtures together,high Strengthandhighperformanceconcrete 3 B.Bhattacharjee DEPARTMENT OFCIVIL ENGINEERING, IITDELHI DISADVANTAGES OFCONCRETE "L0We9CY09°°5 Canbedesignedfordesiredprvherty I .:oLowtensi/estrength. ductiIity(britt/e) Moncreteismostpopularconstruction B.BhattaCharJee ' #4 DEPARTMENT OFCIVIL ENGINEERINGIIIT DELHI C0N0HETE&COMPOSITES °2'NormaI strengthConcrete ~:oHighstrength/performance concrete «:«U/trahighstrengthconcrete *I'Fiber Reinforced Concrete. :~Densiedwith sma/I parrc/e(D8P) I .:oMacro DefectFree(MDF)Matrix ReactivePowder Concrete (H/=0) *1P0/ymerConcrete(PC) *t'PolymercementConcrete ' B.Bhattacharjee DEPARTMENT OFCIVIL ENGINEERING, IITDELHI V V a RVeinforcémeVn%t H L DEPARTMENT OFCIVIL ENG1NEER1NG,11T DEiLHI & DESIGNATIONOFNOHMAL _ Concrete is designated throughgg day Standardcube00mPressive strengfhInIndiansranaaracoae orpractice (/8456) aconoreteisdesignatedbyitscharacteristiccub compressi Vestrength at 28days,thecube beingcast,cured a standardmanner. uconcrereisdesignatedasMzahasa-may Characteristicstandardstrengthor25MPa. » B~BhattaCharJee ' DEPARTMENTQFCIVIL ENGINEERING, HTI)ELHI,f f o:« N°"n13l5tref79tl700n0ret9-'35 oz» Highstrength concrete.-60: f Cs120MPa. UltraHighstrengthconcrete: 12oMPa. »:«Performance atfreshsfate.'Se/fC0m.0ac Long termdurabilityperformance. >concreteisa versatileconstruction -« LB.%B%hattacharje%e V ~.,,_ W_* %DEPARTMENT oFc1V1LENG1NEER1NG;11T DELHI SUMMARY Naturalaggregates, cement orcementitious and waterandalsoadmixtures. °°n°retec°mpositesconcreteisdesignatedbvcharacteristics 28 davcubecmpressivestrength. erformance ofconcrete at andhardenedstate- hardening B.Bhaaacnarjee DEPARTMENT VQFLCLILVILLENGINEISRINGPIITVDELHIA Production Process Batchin0 QUALITY CONTROL /8 MOSTIMPORTANT E.Bhattacharjee DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI 13 Batching theprocessof measurement ofspecifiedquanfifiesofcement, aggregates,Waterand ingredientsofincorrect >Nozdesirable except forsmallnonengineeredjobs B.%BhatMtacharjeei N"M VV Q M L DEPARTMENTQF CIVIL ENGINEERING, HTDELH1 N N 7 Batchingbymass(weights)as reproducibilityof loose volumeis inadequateand isnot economical E Comm/andstorage fmateria Aggregate bi sforstoring aggregate. Silos for storingcementand cementitious materials V J3 B. Bha%ttacharjeefI I VV ii DEPARTMENT OFCIVIL ENGINEERING, IITDELHI 15 Batching P/ant Componentsof aBatchingPIant Aggregate binsforvarioustypesof eagyg;reaguatz9sL Feeding mechanisms scrappers,conveyorsorhoists etc.to transferaggregateto scales(balances). 0) Balanceandmeasuringsystem. B.BhattacharJee 3t VDEPARTMENT OFCIVILENGINEELRINGQIIT DELHI BatchingP/ant bUcketconvey0r. Thestoragetankforwaterandwater ,.* DEPARTMENTOFcIvILENGINEERING=IIT DELHI S. . lucisxstgeylcvtunrnrcxmvayorbclc .A3ugme5hoi:R, T¢:7t:m4::9..ETE MIXIM; smr tyne ; hmmwer (Zl:;NlERS BATCHING Scrapp Fly ash silo CD § 3.. CD PLANT BATCHING PLANT Screw Control Conve Room Mixer e» -P/antTypecanbecyo/Io or - P/amTJ'/oe canbeaummafic ormanual RecommendationofIS456isi2%forthe qua?/TY0f09m9f measuredand i3%f0f thequantityofaggregate,waterand admixturebeingmeasured. 4 B.Bha:tacharjee 4* DEPARTMENT OFCIVILENGINEEMNG,HTDELH1 PLANTCAPACITY -Capacity depends ~:»1)sizeof thejob; 62)requiredproductionrate,-and »:»3)requiredstandardofbatching /0erf0rmance- >Capacizy of thematerial hand/ingsystem, bin size:batchersizeandi mixturesize numbercontrolsthecapacity OLQZ: Q4--) E LV B.BEh2L1LttaLcharjeeE EVL * W, ,E DEPARTMENT OFCIVILENGINEERINGJIT DELHI nmsraumemr/mom AND MEASUREMENTS mechanica//eversystem,/Oadce//setcf V measurementsofmass. Control/ingthedischargefromstora weighhoppersis through gatesoperated compressed aircylinders. Presettingofdesired batch weightscan be doneby devicessuchaspunchedcards, digitswitchesorrotating dialsand computers. ¢ VB.VBhattaCharjeeh V LV V L } * V VV M _ V V _V 23 . , wk DEPARTMENT OFCIVILhELNGINEERING,hIITDELHIL: INSTRUMENTATIONAND MEAsuREMENTs E/ectrica/ormicrowave moisture gauges canbe usedasaaareaatemoisturemetersWateris mostcommonlymeasured through flowmeters, a/th0U9hin S0mep/antswafer _ Withthe need ofadequate calibration, frequentregu/awry routineandSpecia/isfS checksof weighingprocessarerequired LB.BLha:tacharjeé _f é T? [DEPARTMENT OFCIVIL LENGINEERINQAIIT DELHI T 7 TOLERANCES (indiVidUa|Batch IS4925) Ingredient Batchingt01eraI1ces(% I(Em%um0w% cementitious materials Water Volums or f Weight>»% Aggrégates» weight),%I I Bhétacharjee A II A A_ DEPARTMENT OFCIVILENGINEERING, IITDELHI V TQLERANCESgndividuaIgatohj tolerancesappliesto: [O.3>