The Effect of Boric Acid on Mechanical Properties and Structural Characterization of Self-Compacting Concrete

Abstract

Within the scope of this thesis, it is aimed to produce boric acid doped Self-Compacting Concrete (SCC) to be used especially in other buildings that are exposed to nuclear power plants and radiation. Within this scope, a reference sample without boric acid and which fulfils the conditions of being SCC was produced, and 0.5%, 1.0%, 1.5%, 2.0%, 2.5% boric acid was added to concrete water respectively by weight in addition to the reference sample design. Freshly Mixed Concrete Flow Table Test, V-Funnel, L Shape Box, U Shape Box Tests were performed on these samples in order to observe whether there was a change in the conditions of being SCC. Compressive strength and flexural strength tests were performed in order to compare the change in mechanical properties of obtained samples. Also, SEM and XRD analyses were carried out in order to observe the structural characterization changes. As a result of the studies, it was observed that boric acid doped concretes had the characteristics of Self-Compacting Concrete, compressive strength increased compared to reference sample, flexural strength decreased, porous structure in material decreased compared to reference sample.

Keywords

• Self-Compacting Concrete,, Boric Acid,,Sem,Xrd

Borik Asidin Kendiliğinden Yerleşen Betonun Mekanik Özellikleri ve Yapısal Karakterizasyonuna Etkisi

Abstract

Bu çalışma kapsamında, özellikle nükleer santraller ve radyasyona maruz olan diğer yapılarda kullanılabilecek borik asit katkılı Kendiliğinden Yerleşen Beton (KYB)ların üretilmesi amaçlanmıştır. Bu kapsamda, KYB olma şartlarını sağlayan ve borik asit ilavesiz bir referans numune üretilmiş olup, oluşturulan referans numune dizaynına ilave olarak beton suyuna ağırlıkça sırasıyla %0.5, %1.0, %1.5, %2.0, %2.5 borik asit ilave edilerek numuneler oluşturulmuştur. Bu numuneler üzerinde KYB olma şartlarında değişim olup olmadığını gözlemlemek için Taze Beton Deneylerinden Yayılma Tablası, V-Hunisi, L-Kutusu, U-Kutusu deneyi yapılmıştır. Elde edilen numunelerin mekanik özelliklerindeki değişimi kıyaslamak için basınç dayanımı ve eğilme dayanımı deneyleri yapılmıştır. Ayrıca yapısal karakterizasyon değişimlerini gözlemlemek içinde SEM ve XRD analizleri yapılmıştır. Yapılan çalışmalar neticesinde borik asit katkılı betonların Kendiliğinden Yerleşen Beton olma özelliği taşıdığı, basınç dayanımının referans numuneye oranla arttığı, eğilme dayanımının azaldığı, referans numuneye kıyasla malzemedeki gözenekli yapının azaldığı gözlemlenmiştir.

Keywords

• Knediliğinden Yerleşen Beton,Borik Asit,Sem,Xrd

References

1. [1] Neville, AM. Properties of concrete. ELBS. 1989.
2. [2] Singh KJ, Signh N, Kaundal, RS, Singh K. Gamma-ray shielding and structural properties of Pbo-SiO2 glasses. Nuclear inst. meth. phy. resea. 2008; 944-948.
3. [3] Baradan B. Building material-II. Dokuz Eylül University Faculty of Engineering Publications; 1997
4. [4] Gül M. Investigation of the use of waste plastics and PET as lightweight aggregate concrete [Master’s Thesis], Elazığ: Fırat University; 2018.
5. [5] Gökçe HS. Investigation of usability of raw and expanded perlite in lightweight concrete production [Master’s Thesis], Ankara: Gazi University; 2010.
6. [6] Ünal O, Uygunoğlu T. Usage of diatomite in lightweight concrete production. Chamber of Civil Engineers Tech. Journal. 2007; 1: 4025-4034.
7. [7] Hama SM, Hilal NN. Fresh properties of self-compacting concrete with plastic waste as partial replacement of sand. Inter. J. Sust. Built Env. 2017; 6(2): 299-308.
8. [8] Altoubat S, Junaid MT, Leblouba M, Badran D. Effectiveness of fly ash on the restrained shrinkage cracking resistance of self-compacting concrete. Cem. and Conc. Comp. 2018;79: 9-20.

9. [9] Huang F, Li H, Yi Z, Wang Z, Xie Y. The rheological properties of self compacting concrete containing superplasticizer and air-entraining agent. Const. and Build. Mater. 2018; 166: 833-838.
10. [10] Güneyisi E, Gesoğlu M. Self-compacting mortars consisting of fly ash and metacaoline. 2. Symposium of Chemical Additives in Buildings. Ankara; 2007. p. 161- 172.
11. [11] Matos PR, Foiato M, Prudencio LR. Ecological, fresh state and long-term mechanical properties of high-volume fly ash high-performance self-compacting concrete. Const. and Build. Mater. 2019; 203: 282-293.
12. [12] Abdalhmid JM, Ashour AF, Sheehan T. Long-term drying shrinkage of self-compacting concrete: Experimental and analytical investigations. Const. and Build. Mater. 2019; 202: 825-837.
13. [13] Benaicha M, Alaoui H, Jalbaud O, Burtchell Y. Dosage effect of superplasticizer on self-compacting concrete: correlation between rheology and strength. J. Mater. Res. and Tech. 2019; 8(2): 2063-2069.
14. [14] Leung HY, Kim J, Nadeem C, Jaganathan J, Anwar MP. Sorptivity of self-compacting concrete containing fly ash and silica fume. Const. and Build. Mater.2016; 113: 369-375.
15. [15] Özdemir M, Öztürk NU. Utilization of clay wastes containing boron as cement additives, Cem. and Conc. Rese. 2003; 33 (10): 1659-1661.
16. [16] Elbeyli Y, Kalpaklı Y, Gülen J, Pişkin M, Pişkin M. Utilization of borax waste as an additive in building brick production, International Boron Symposium. Eskişehir: 2004. p. 23-25. [17] Çağlar A. Experimental research on improvement with boron waste additive of properties of blend brick used in traditional Kastamonu houses. [Doctoral Thesis], Konya: Selçuk University; 2018.
17. [18] Sağlık A, Sümer O, Tunç E, Kocabeyler MF, Çelik RS. Boron modified active belite (BAB) cement and its applicability for DSI projects, DSI Technical Bulletin. 2009; 105: 1-22.
18. [19] Şahin M. An investigation on the effect of boric acid addition on brick production. [Master’s Thesis], Afyonkarahisar: Afyon Kocatepe University; 2009.
19. [20] Akyıldız A. Investigation of usability of boric waste as a pozzolanic material in production of concrete. [Doctoral Thesis], Hatay: Namık Kemal University; 2012.
20. [21] Evcin A, Ersoy B, Çiftçi H. Utilization of marble and boron waste in brick products, Int. J. Comp. and Exp. Sci. and Eng.2019; 5(1): 19-22.
21. [22] Çelik AG, Depçi T, Kılıç AM. New lightweight colemanite-added perlite brick and comparison of its physicomechanical properties with other commercial lightweight materials. Const. and Build. Mater. 2014; 62: 59-66.
22. [23] TS EN 197-1. Cement- Part 1: Compositions and conformity criteria for common cements. Turkish Standards Institute; 2012, Ankara. [24] Efnarc. The European guidelines for self-compacting concrete specification, production and use. Self-Compacting Concrete European Project Group. 2005.