The use of recycled materials or waste increases sustainability in the construction sector. Likewise, the self-compacting concrete (SCC) has shown improvement in mechanical properties, when made with some waste pozzolanic materials. The differences in the compressive strength of the SCC concrete sample in the case of 5% by mass share of silica fume compared to samples with 7% were explored. The results shown that optimal replacement of Ordinary Portland Cement by silica fume is 5%, under applied experimental conditions

Dimović, Slavko

Jelić, Ivana

Savić, Aleksandar

Sljivic-Ivanovic, Marija

Savić, Aleksandar R.

GraFar - Repository of the Faculty of Civil Engineering

UNIVERSITY OF BELGRADE   TECHNICAL FACULTY BOR   52nd International October Conference on Mining and Metallurgy    PROCEEDINGS   Edited by Saša Stojadinović and Dejan Petrović   November 29th – 30th 2021 Bor, Serbia UNIVERSITY OF BELGRADE   TECHNICAL FACULTY IN BOR   52nd International October Conference on Mining and Metallurgy    PROCEEDINGS   Edited by Saša Stojadinović and Dejan Petrović   November 29th – 30th 2021 Bor, Serbia 52nd International October Conference  on Mining and Metallurgy, IOC 2021  PUBLISHER: UNIVERSITY OF BELGRADE ‐ TECHNICAL FACULTY IN BOR, BOR, NOVEMBER 2021  FOR THE PUBLISHER:  DEAN: Prof. dr Nada Štrbac  EDITORS: Prof. dr Saša Stojadinović Doc. dr Dejan Petrović   TECHNICAL EDITOR Pavle Stojković, MSc.  PRINTED BY:  »Štamparija Atlantis d.o.o.« Niš   CIRCULATION: 100 Copies  CIP – Каталогизација у публикацији – Народна библиотека Србије, Београд 622(082) 669(082)  INTERNATIONAL October Conference on Mining and Metallurgy (52 ; 2021 ; Bor) Proceedings / 52nd International October Conference on Mining and Metallurgy ‐ IOC 2021, November 29th ‐ 30th 2021 Bor, Serbia ; [organizer] University of Belgrade, Technical Faculty in Bor ; [co‐organizer Institute for Mining and Metallurgy Bor] ; edited by Saša Stojadinović and Dejan Petrović. ‐ Bor : University of Belgrade, Technical Faculty, 2021 (Niš : Atlantis). ‐ V, 228 str. : ilustr. ; 25 cm  Tiraž 100. ‐ Bibliografija uz svaki rad.  ISBN 978‐86‐6305‐119‐5  а) Рударство ‐‐ Зборници б) Металургија ‐‐ Зборници  COBISS.SR‐ID 52072201      INF1Vinc2Fac AbstracThe use self-compwaste pothe caseshown texperimeKeyword1. INTThe durand alsoslag, etcthe consmaterialSilica fualloys sleads todosage durabiliperformdense mAlso, thmade bysome hyin improfume reSilicate pozzolaproducemechanAccordisilica fuof cemefume inpartial rconcreteLUENCIvana Jela Institute oulty of Civt of recycled acting conczzolanic ma of 5% by mhat optimal ntal conditis: sustainabRODUCTability of c by the usa. [1]. On thtruction ses in concreme represmelting fur improvemof silica futy can be dance of conicrostructue self-com using silidration provement ofmains an inHydrate)anic action sadditionalical and durng to the lime. By somnt (by wei concrete iseplacement considerab The 52E OF SILić1, Aleksaf Nuclear il Engineermaterials orrete (SCC) terials. Theass share oreplacemenons. ility, recycliION  oncrete cange of pozzoe other hanctor [2]. Sute also incrents a by-pnaces [1]. Sent in permme, a signieveloped ucrete couldre due to sipacting coca fume [5]ducts of cemechanicalert materind calciumtakes pla C-S-H in tability propterature dae authors,ght) [7]. H 5%. It is o of OPC. Tly[8]. nd InternatiICA FUMndar SavićSciences, Uing, Univer waste increhas shown im differences f silica fumet of Ordinang, compres be improvlanic mated, the use obstitution oeases the enroduct fromilica fumeeability anficant incresing fine g be attribulica fume anncrete (SC. Due to thment and t and durabial in concre hydroxidecebetween he voids leerties by pta, the auth the optimizowever, sombserved thahe silica fuonal OctobNovew E ON S 2, Marija Šniversity oSerbiasity of Belgases sustainprovement in the comp compared ry Portlandsive strengthed by limitrials like: sf recycled f Ordinary ergy efficie the exha addition ind durabilityase in strenround pozzted to the fd calcinedC) has reve higher finhereby redulity propertte. Thehyd (free limcalcium hft after hydroviding a or’s opinioed dosage e investigt the optimme inclusier Conferember 29th – 30ww.ioc.tfbor.bgCC CONljivić-Ivanf Belgrade, rade, B.K.Aability in thin mechanicressive strento samples  Cement by. ing size andilica fume, materials oPortland Cency of the ust gases o concrete m of concregths couldolanic admact that it e clays as poealed improeness of scesthe pories of the cration of ce). C-S-H ydroxide aration of cmuch densens are dividof silica fuation showum dose ofon increasence on Mith  , 2021 .ac.rs CRETE ović1, SlavM.P.A. 12-. 73, 1100e constructial propertiegth of the Swith 7% we silica fume type of agnano-silicar waste incrment (OPCprocesses if ferrosilicight refinete. By the u be achieveixture silicxhibits lesszzolans forvement inilica fume, osity of cononcrete. Inement prodisresponsibnd silica ement.The r matrix [6ed regardime lies in 7ed that the silica fumes the workning and MPROPERko Dimovi14, 11351B0 Belgradeon sector. Ls, when madCC concretre explored. is 5%, ungregate, th, fly-ash, bleases susta) by wastenvolved. on, silicon, pore structilization od. A concra fume [3].er micro cr concrete [4mechanicalit reacts vecrete, henc the earlystuces C-S-Hle for strfume, whextra C-S-H]. ng the parti – 10 or 8– optimal ra is 5% wheability and etallurgyTIES ć1 elgrade, , Serbia ikewise, thee with somee sample in The resultsder appliede w/c ratio,ast furnaceinability in pozzolanic and metalture whichf optimumete of high The betteracking and].  propertiesry fastwithe resultingages, silica (Calciumength. Theich further improvescipation of10% sharete of silican used as astrength of                            125   The 52nd International October Conference on Mining and Metallurgy, 29-30November 2021   The aim of this study was to investigate the effect of reducing the recommended silica fume dose in SCC with recycled aggregate. The differences in the compressive strength of SCC concrete in the case of a 5% share of silica fume compared to samples with 7% were explored. 2. EXPERIMENTAL Materials of sampleswere:  Silica fume (0.1μm average particle size);  OPC, PC35 M (V-L) 42.5 R,Beočin, Serbia;  Limestone filler, Granit peščar, Ljig, Serbia;  Superplasticizer, TKK, Slovenia;  Aggregate, Gradient, Serbia;  Recycled aggregate, smashed experimental samples;  Water. Namely, all samples had to achieve values of slump flowmore than 800 mm according to recommendations [9], therefore a required amount of superplasticizer was used. The defined compositions of the SCC samples are listed in Table 1. Table 1 –Compositions of the samples Materials Amounts  SCC7 SCC5 OPC 353.4 kg/m3 368.6* kg/m3 Limestone filler 223 kg/m3 223 kg/m3 Superplasticizer 1.1% 1.1% Water 178 kg/m3 178 kg/m3 Aggregate (I, II, and III faction) 860; 265; 155 kg/m3 860; 265; 155 kg/m3 Recycled aggregate (I, II, and III faction) 0; 265; 155 kg/m3 0; 265; 155 kg/m3 Silica fume 7% 5% *OPC mass was increased due to the reduced mass of silica fume  The extremely fine, amorphous, and latently reactive silica fume was used. Before water addition, silica fume was mixed with OPC. The optimal mixing time was 90 s. Dry materials, i.e. recycled aggregate, limestone filler, and cement/silica fume mixture were mixed for one minute. Water was added for the next 30 s, after which the superplasticizer was dosed with the addition of water. Stirring was continued until 5 min. had elapsed. The samples were demolded after 1 day andcured in 20˚C water for 28 and 90 days (in total). 3. RESULTS AND DISCUSSION The compressive strength tests were performed according to the standard SRPS EN 12390-3:2010 for cubic samples [10]. The results are presented in Figure 1. for SCC7 and SCC5 samples after 28 and 90 days marked as SCC7-28, SCC5-28, SCC7-90, and SCC5-90, respectively. 126   The 52nd International October Conference on Mining and Metallurgy, 29-30November 2021    Figure 1. Compressive strengths of samples  The results showed that the compressive strength after 28 days was not significantly affected by the reduction in the amount of silicate fume. However, measurements after 90 days indicated that the sample with 5% silica fume (SCC5-90) showed slightly higher compressive strength. Based on the results, it could be noted that the improvement in compressive strength due to silica fume incorporation in concrete occurs because of the chemical pozzolanic activity and filler action. However, an increase in thecompressive strength in SCC5 samplescould be explained by silica fume higher amount in SCC7than it was requiredfor pozzolanic actions, and hence reduction in strength [8].Likewise, the amount of OPC in SCC5 samples was higher relative to SCC7, and compressive strength was expected to be elevated. This investigation indicated that the optimal replacement of OPC by silica fume is 5%, under applied experimental conditions. 4. CONCLUSION The effect of the recommended silica fume amount reduction in SCC with recycled aggregate was explored. The compressive strength of samples after 28 and 90 days were performed. The results for samples SCC7-28, SCC5-28, SCC7-90, and SCC5-90, were 67.2, 67.5, 76.2, and 77.4 MPa, respectively. An increase in compressive strength in samples with 5% silica fume could be explained by silica fume higher amount in SCC7 than it was required for pozzolanic actions and a higher amount of OPC. ACKNOWLEDGEMENTS The research presented in this paper was done with the financial support of the Ministry of Education, Science and Technological Development of the Republic of Serbia, within the funding of scientific research work at the University of Belgrade, Vinca Institute of Nuclear Sciences (Contract No. 451-03-9/2021-14/200017) and the University of Belgrade, Faculty of Civil Engineering (No. 200092). REFERENCES [1] S.K. Verma, C.S. Singla, G. Nadda, R. Kumar, Mater. Today, 32 (4) (2020) 882-887. [2] M. Yilmaz, A. Bakiş, Procedia Soc.Behav. Sci., 195 (2015) 2253-2262. 67,2 67,576,277,462646668707274767880SCC7‐28 SCC5‐28 SCC7‐90 SCC5‐90Compressive strength [MPa]Sample127   The 52nd International October Conference on Mining and Metallurgy, 29-30November 2021   [3] O. Zaid, J. Ahmad, M.S. Siddique, F. Aslam, H.  Alabduljabbar, K.M. Khedher, Sci. Rep. 11, 12822 (2021). [4] M. Antoni, Fac. Sci. Tech. L’Ingeniur, 1 (2013). [5] H.A.F. Dehwah, Constr. Build. Mater. 26 (1) (2012) 547-551. [6] V. Srivastava, V.C. Agarwal, R. Kumar, J. Acad. Ind. Res. 26 (4) (2012) 347-357. [7] A. Imam, V. Kumar, V. Srivastava, Adv. Concr. Constr., 6 (2) (2018) 145-157. [8] V. Srivastava, R. Kumar, V.C. Agarwal, P.K. Mehta, J. Environ. Nanotechnol., 3 (3) (2014) 32-35. [9] G. Ke, J. Zhang, J. Adv. Concr. Technol., 18, (2020) 17-26. [10] SRPS EN 12390-3:2010, Testing hardened concrete – Part 3: Compressive strength of test specimen.  128

Influence of Silica Fume on SCC Concrete Properties

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Influence of Silica Fume on SCC Concrete Properties

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