Effect of Silica Fumes and Polypropylenefibres on Strength Of Concrete

Transcription

1 IOSR Journal of Enginring (IOSRJEN) ISSN (): , ISSN (p): Vol. 08, Issu 4 (April. 2018), VI PP Effct of Silica Fums and Polypropylnfibrs on Strngth Of Concrt S Bhanu Prasanth, S Srikanth Rddy, K Jagadp, P Raju, Excutiv Enginr, Msn Lif Scincs Pvt Ltd, Hydrabad, Tlangana, India , Assistant Profssor, Dpt. Of Civil Enginring, S R K R Enginring Collg, Bhimavaram, Andhra Pradsh, India , Assistant Profssor, Dpt. Of Civil Enginring, S R K R Enginring Collg, Bhimavaram, Andhra Pradsh, India , Assistant Profssor, Dpt. Of Civil Enginring, S R K R Enginring Collg, Bhimavaram, Andhra Pradsh, India , Corrsponding authr: S Bhanu Prasanth ABSTRACT: Concrt Is Th Main Componnt Of Today s Constructions. Typically Concrt Consists Of Mixtur Of Cmnt, Sand And Coars Aggrgat. Manufacturing Of Cmnt Crats Pollution Which Possss Thrat To Living Bings. Hnc Nd For Safr Cmnt Altrnativ Matrials Is Incrasing. Silica Fum Is On Such Altrnativ Matrial Obtaind As A By-Product In Frrosilicon Alloy And Silicon Production That Prdominantly Contains Silica. Hnc In Th Prsnt Study An Attmpt Is Mad In Rplacing Cmnt With Silica In Diffrnt Proportions In Concrt To Obtain An Optimum Prcntag Of Silica Fums For Effctiv Us In Concrt.Also Polypropylnfibrs Ar Usd As Scondary Rinforcmnt In Th Concrt Undr Study. Th Study Showd That Us Of Silica Fums In Combination With Polypropylnfibrs In Concrtrsultd In 17% Incras Ofcomprssiv Strngth In Comparison To Convntional Concrt. KEYWORDS: Silica Fums, Polypropylnfibrs, Concrt Dat of Submission: Dat of accptanc: I. INTRODUCTION Dvloping Countris Lik India Involv Construction Of Hug Infrastructur That Rquir Good Quality Concrt. This Hug Infrastructur Rquirs Concrt In Hug Quantitis That In Turn Involvs In Production Of Tons Of Cmnt. Production Of Cmnt Rsults In Pollution Causd Du To Emission Of Co 2. It Is Rportd That About 7% Of Worldwid Emissions Of Co 2 Is From Cmnt Industry [1,2]. This Poss A Srious Thrat To Environmnt. Also Th Nd For High Strngth Sustainabl Concrt Has Incrasd For Construction Of High Ris Buildings And High Spd Transportation Systms.This Ld To Sarch For Altrnativ Matrials. Various Rsarchrs Had Trid Using Industrial, Agricultural And Aqua-Agricultural Wastsas Supplmnts To Cmnt In Concrt [3]. Us Of Fly Ash As A Supplmnt To Cmnt Rsultd In A Good Quality And Durabl Concrt [3, 4]. Rsarchrs Had Rportd That Us Of % Ric Husk Ash In Slf Compacting Concrt Had Rsultd In Incras In Strngth, Workability And Slf-Compactibility Of Concrt [5]. Partial Rplacmnt Of Cmnt With Wast Glass Powdr Showd An Improvmnt In Strngth Of Concrt [6]. Cramic Wast Powdr Also Showd An Incras In Strngth And Durability Aspcts Of Concrt Upon Rplacing Cmnt [7]. Silica Fum Is On Of Industrial By-Productwhich Is Obtaind From Frrosilicon Alloy And Silicon Production. It Prdominantly Consists Of Silica, Which Is Th Ky Ingrdint In Concrt That Is Rsponsibl For Its Strngth. Hnc In Th Prsnt Study An Attmpt Is Mad In Rplacing Cmnt In Concrt With Silica In Diffrnt Proportions. Polypropyln Fibrs Ar Usd As Scondary Rinforcmnt In Concrt Undr Study. Th Prsnt Study Highlights Th Incras In Strngth Of Concrt With Rplacmnt Of Cmnt With Silica And Addition Of Polypropyln Fibrs. Matrials Usd In Th Study Ordinary Portland Cmnt Availabl In Th Local Markt Is Usd In Th Invstigation. Th Proprtis Of Cmnt Ar Dtrmins As Pr Th Tsts Spcifid In Is: And Th Rsults Ar Prsntd In Tabl P a g

2 Locally Availabl Rivr Sand Is Usd As Fin Aggrgat In Th Prsnt Invstigation. Th Sand Is Fr From Clay, Silt And Organic Impuritis. Th Fin Aggrgat Usd Confirms To Th Standard Spcifications As Pr Is: Th Proprtis Of Fin Aggrgat Ar Prsntd In Tabl 2. Machin Crushd Angular Granit Mtal Of 20mm Nominal Siz From Th Local Sourc Is Usd As Coars Aggrgat. Th Coars Aggrgat Is Tstd To Dtrmin Its Physical Proprtis And Th Tst Rsults Ar Prsntd In Tabl 3. Tabl 1. Proprtis Of Cmnt Normal Consistncy 33% Stting Tims a. Initial(Minuts) 50 b. Final(Minuts) 180 Spcific Gravity 3.15 Soundnss (L-Chatlir Tst) (Mm) 1.30 Comprssiv Strngth Of Cmnt (days) 53 Spcific Surfac Ara (M 2 /Kg) 320 Tabl 2:Proprtis Of Fin Aggrgat Spcific Gravity 2.67 Bulk Dnsity (Kg/M 3 ) a. Loos Stat 1600 b. Dns Stat 1750 Finnss Modulus Zon Ii Tabl 3. Proprtis Of Coars Aggrgat Bulk Dnsity(Kg/M 3 ) 1400 (Loos Stat) 1574 (Dry Roddd) Spcific Gravity(G) Finnss Modulus 7.55 Micro Silica Or Silica Fum Is Th Most Commonly Usd Minral Admixtur In High Strngth Concrt. Silica Fum Consists Primarily Of Amorphous (Non-Crystallin) Silicon Dioxid (Sio 2 ). Th Individual Particls Ar Extrmly Small, Approximatly 1/100th Th Siz Of An Avrag Cmnt Particl. Bcaus Of Its Finnss In Fin Particl Sizs, Larg Surfac Ara, And Th High Silicon Dioxid (Sio 2 ) Contnt, Silica Fum Is A Vry Ractiv Whn Usd In Concrt.Th Chmical Composition And Physical Natur Of Silica Fums Ar Shown In Tabl 4. A. Physical Spcific Surfac Ara Physical Stat Odor Apparanc Color Pack Dnsity P h Of Solution Spcific Gravity Moistur Oil Absorption Spcific Surfac Ara Tabl 4.Proprtis Of Silica Fums To Kg/M 2 Micronizd Powdr Odorlss Whit Color Powdr Whit 0.76 Gm/Cc % 55 Ml / 100 Gm To 20000kg/M 2 68 P a g

3 B. Chmical Proprtis Silica (Sio 2 ) Alumina (Al 2 o 3 ) Frric Oxid (F 2 o 3 ) Titanium Oxid (Tio 2 ) Calcium Oxid (Cao) Magnsium Oxid (Mgo) Pottasium Oxid (K 2 o) Sodium Oxid (Na 2 o) Loss On Ignition % 0.043% % 0.001% % 0.003% 0.01 Rcron-3s Is A Discrt, Discontinuous Short Fibr Mad Up Of Polypropyln, That Can B Usd In Concrt To Control And Arrst Cracks. It Arrsts Shrinkag Cracks In Concrt And Incrass Rsistanc To Watr Pntration, Abrasion And Impact. It Maks Concrt Homognous And Also Improvs Th Comprssiv Strngth, Ductility And Flxural Strngth Togthr Proving Th Ability To Absorb Mor Enrgy. Us Of Uniformly Disprsd Polypropylnfibrs Rducs Sgrgation And Blding And Also Rsults In A Mor Homognous Mix Of Concrt. Rcron3s Is Mant For Scondary Rinforcmnt Only. II. PREPARATION OF SPECIMENS Convntional Concrt Mixing Mixing Of Ingrdints Is Don In Pan Mixr. Th Cmntitious Matrials Ar Thoroughly Blndd And Thn Th Aggrgat Is Addd And Followd By Gradual Addition Of Watr And Mixing. Polypropylnfibrsand Sp430 Ar Also Addd Carfully. Polypropylnfibrs Ar Mixd In Varying Proportions Of 0.1 %, 0.2 %. Wt Mixing Is Don Until A Mixtur Of Uniform Color And Consistncy Is Achivd Which Is Thn Rady For Casting. Casting And Curing Th Iron Moulds Ar Cland And Minral Oil Is Applid On All Th Sids Of Th Mould. Th Moulds Ar Placd On A Lvl Platform. Th Wll Mixd Concrt Is Filld Into Th Moulds By Vibration With Ndl Vibrator. Th Sampls Ar Lft For 24 Hours For Initial Stting And Thn Ar Rmovd From Moulds And Thn Placd In Curing Tank For And. Modifid Concrt In Modifid Concrt, Cmnt Is Rplacd By Silica Fums Addd In Varying Proportions Of, 1, 1 And 2. Also Polypropylnfibrs Ar Addd In Varying Proportions Of And Along With Sp430 Admixtur To Th Abov Mixtur. Th Procss Of Mixing, Casting And Curing Ar Don In Similar Fashion To That Of Convntional Concrt. Tsting Of Spcimns Th Spcimns Obtaind Aftr Curing For And Ar Thn Tstd For Flxural Strngth, Comprssiv Strngth And Tnsil Strngth According To Th Procdur Givn By Is: Th Rsults Of Comprssiv Strngth, Tnsil Strngth And Flxural Strngth Tsts Prformd On Convntional Concrt And Concrt With Varying Proportions Of Polypropylnfibrs Ar Prsntd In Tabl 5. Tabl 6 Shows Th Rsults Obtaind From Strngth Tsts Carrid Out On Modifid Concrt With Silica Fums And Varying Proportions Of Polypropyln Fibrs. Tabl 7 Prsnts Th Rsults Obtaind From Comprssion Tst, Tnsil Tst And Flxural Strngth Tst Carrid Out On Modifid Concrt With 1 Silica Fums And Diffrnt Proportions Of Polypropylnfibrs. Rsults Of Strngth Tsts On Modifid Concrt With 1 Silica Fums And Polypropylnfibrs In Diffrnt Proportions Ar Tabulatd In Tabl 8. Tabl 9 Prsnts Th Rsults Of Strngth Tsts On Sampls Of Modifid Concrt And Diffrnt Proportions Of Polypropylnfibrs. Tabl 5. Comprssiv Strngth, Tnsil Strngth And Comprssiv Strngth For Convntional Concrt And Concrt With Polypropylnfibrs In Varying Proportions Polypropylnfibr Polypropylnfibr Polypropylnfibr Polypropylnfibr Strngth 69 P a g

4 Comprss iv Strngth Tnsil Strngth Flxural Strngth Tabl 6. Comprssiv Strngth, Tnsil Strngth And Comprssiv Strngth For Modifid Concrt With Silica Fums And Polypropylnfibrsin Varying Proportions Strngth Polypropylnfibr Polypropylnfibr Polypropylnfibr Polypropylnfibr Comprss iv Strngth Tnsil Strngth Flxural Strngth Tabl 7. Comprssiv Strngth, Tnsil Strngth And Comprssiv Strngth For Modifid Concrt With 1 Silica Fums And Polypropylnfibrsin Varying Proportions Polypropylnfibr Polypropylnfibr Polypropylnfibr Polypropylnfibr Strngth Comprs siv Strngth Tnsil Strngth Flxural Strngth Tabl 8. Comprssiv Strngth, Tnsil Strngth And Comprssiv Strngth For Modifid Concrt With 1 Silica Fums And Polypropylnfibrsin Varying Proportions Polypropylnfi Polypropylnfib Polypropylnfibr Polypropylnfibr br r Strngth Comprs siv Strngth P a g

5 Comprssiv Strngth (MPa) Tnsil Strngth Flxural Strngth Tabl 9. Comprssiv Strngth, Tnsil Strngth And Comprssiv Strngth For Modifid Concrt With 2 Silica Fums And Polypropylnfibrsin Varying Proportions Polypropylnfibr Polypropylnfibr Polypropylnfibr Polypropylnfibr Strngth Comprssiv Strngth Tnsil Strngth Flxural Strngth days days - Convntional Concrt, - Modifid Concrt, - Various Concrt Mixturs in Study Fig 1. Comparison Of Comprssiv Strngths Of Various Concrts In Th Study 71 P a g

6 Flxural Strngth (MPa) Tnsil Strngth (MPa) Various Concrt Mixturs in Study 7 days days - Convntional Concrt, - Modifid Concrt, - Silica Fums, - Polypropyln Fibrs Fig 2. Comparison Of Tnsil Strngths Of Various Concrts In Th Study & & & 1 1 & 1 & 1 & 1 1 & 1 & 1 & 2 2 & 2 & 2 & Various Concrt Mixturs in Study 7 days days - Convntional Concrt, - Modifid Concrt, - Silica Fums, - Polypropyln Fibrs Fig 3. Comparison Of Flxural Strngths Of Various Concrts In Th Study III. DISCUSSION From Figur 1, It Can B Sn That Th Modifid Concrt With Silica Fums And Polypropylnfibrs Showd Highr Comprssiv Strngth In Comparison To Othr Concrt Mixturs. Also From Figur 2, Modifid Concrt With Silica Fums And Fibrs Rsultd In Highr Tnsil Strngth Whn Compard To Othr Concrt Mixturs. In Contradiction To Th Prvious Prcntag Of Silica Fums And Fibrs, Modifid Concrt With 1 Silica And Fibrs Showd Highr Of Flxural Strngth Than Th Othr Concrt Mixturs Undr Study. Also It Can B Sn That Th Strngth s Incrasd With Incras In Prcntag Of Silica Fums Upto And Thraftr Th Strngth s Dcrasd. Th Incras In Strngth Can B Attributd To Th Raction Btwn Calcium Prsnt In Cmnt, Watr And Silica In Silica Fums Which Rsults In Formation Of Calcium Silicat Hydrat Gl That Binds Th Concrt Rsulting In Highr Strngths. 72 P a g

7 Also, It Can B Sn From Figurs 1, 2 And 3 That Us Of Silica Fums Along With Fibrs Rsultd In About 17% Incras In Comprssiv Strngth, 22% Incras In Tnsil Strngth And 46% Incras In Flxural Strngth In Comparison To Convntional Concrt Undr Study. IV. CONCLUSIONS From Th Study Carrid Out On Convntional Concrt And Modifid Concrt With Varying Proportions Of Silica Fum And Polypropylnfibrs, It Can B Concludd That Us Of Silica Fums In Combination With Polypropylnfibrs Showd A Rasonabl Incras In Strngth In Comparison To Convntional Concrt. Us Of Silica Fums In Concrt Not Only Incrass Th Strngth But Also Handls Wll Th Wast Disposal Problm Facd By Industris. Hnc Us Of Silica Fums In Concrt Along With Fibrs Not Only Incrass Th Strngth Of Concrt But Also Rducs Th Wast Disposal Problm. REFERENCES [1] Mhta Pk. Grning Of Th Concrt Industry For Sustainabl Dvlopmnt. Concr Intr 2002;July: 23. [2] Kun-Hyok Y. Assssmnt Of Co2 Rduction Of Alkali-Activatd Concrt. J Clanprod 2013;39: [3] Grzgorz Ludwik Golwski, (2018), Effct Of Curing Tim On Th Fractur Toughnss Of Fly Ash Concrt Composits, Composit Structurs, 185, [4] Ashish Kumr S., (2018), Effct Of Class F Fly Ash On Th Durability Proprtis Of Concrt, Sustainabl Environmnt Rsarch,, [5] Ravindr Kaur S., Rafat Siddiqu, (2017), Influnc Of Ric Husk Ash (Rha) On Th Proprtis Of Slf-Compactingconcrt: A Rviw, Construction And Building Matrials, 153, [6] Sadiqul Islam G. M., Rahman M. H., Naym Kazi, (2017), Wast Glass Powdr As Partial Rplacmnt Of Cmnt Forsustainabl Concrt Practic, Intrnational Journal Of Sustainabl Built Environmnt, 6, [7] Dima M. Kannan, Shrif H. Aboubakr, Amr S. El-Dib, Mahmoud M. Rda Taha, (2017), High Prformanc Concrt Incorporating Cramic Wast Powdr As Largpartial Rplacmnt Of Portland Cmnt, Construction And Building Matrials, 144, S Bhanu Prasanth " Effct of Silica Fums and Polypropylnfibrs on Strngth Of Concrt "IOSR Journal of Enginring (IOSRJEN), vol. 8, no. 4, 2018, pp P a g