3D YAZICIYLA BASKILANMIŞ UÇUCU KÜL KATKILI HARÇLARIN RÖTRE ÖZELİKLERİNİN ARAŞTIRILMASI

Yıl 2022, Cilt: 6 Sayı: 1, 143 - 148, 30.04.2022

Tayfun Uygunoğlu , İlker Bekir Topçu , Ömer Ergür

https://doi.org/10.46519/ij3dptdi.1068096

Cited By: 1

Öz

Üç boyutlu (3D) baskı yazıcılar inşaat sektörüne yeni bir boyut kazandırmıştır. 3D baskılı harçlardaki sertleşmiş çimento hamurunun doğal kuruma büzülmesi çok yüksek çimento/ince agrega oranlarına sahip olmaları nedeniyle büzülme davranışı açısından büyük risk oluşturmaktadır. Bu çalışmada, mineral katkı içeren 3D baskı harçlarının yazdırıldıktan sonra zamana bağlı kuruma büzülme davranışları araştırılmıştır. Harçların bileşiminde mineral katkı olarak %0, %10 ve %20 oranlarında uçucu kül kullanılarak farklı harçlar tasarlanmıştır. Mineral katkı çimentoyla ağırlıkça yer değiştirme yöntemine göre kullanılmıştır. Harçlar 3D yazıcıda tek katman olarak baskılandıktan sonra laboratuar ortamında 40 güne kadar boy değişimleri ölçülmüştür. Her bir ölçümün ilk boya oranına göre kuruma büzülme oranları belirlenmiş ve karşılaştırılmıştır. Elde edilen bulgulara göre uçucu kül kullanımıyla kontrol harçların büzülme oranları önemli derecede azaltılmıştır.

Anahtar Kelimeler

3D baskı harç, Mineral katkı, Rötre, 3D baskı harç, Mineral katkı, Rötre

INVESTIGATION OF THE SHRINKAGE PROPERTIES OF 3D PRINTED FLY ASH BLENDED MORTARS

Öz

Three-dimensional (3D) printers have brought a new dimension to the construction industry. The natural drying shrinkage of hardened cement paste in 3D-printed mortars poses a great risk in terms of shrinkage behavior due to their very high cement/fine aggregate ratios. In this study, time-dependent drying shrinkage behavior of 3D printing mortars containing mineral additive was investigated. Different mortars were designed by using 0%, 10% and 20% fly ash as mineral additives in the composition of the mortars. Mineral additive was used according to the weight displacement method with cement. After the mortars were printed as a single layer in a 3D printer, their length changes were measured in the laboratory environment for up to 40 days. Drying shrinkage rates were determined and compared according to the initial dye ratio of each measurement. According to the findings, the shrinkage rates of the control mortars were significantly reduced with the use of fly ash.

Anahtar Kelimeler

3D printing mortar, Mineral additive, Shrinkage, 3D printing mortar, Mineral additive, Shrinkage

Kaynakça

• 1. Uygunoğlu, T., Özgüven, S.B., Topçu, İ.B., "3D Teknolojisi İle Yapı Malzemesi Üretimindeki Gelişmeler", International Journal of 3B Printing Technologies and Digital Industry Vol. 3, Issue 3, 279-288, 2019.
• 2. Uygunoğlu, T, Barlas Özgüven, S.,“3D Beton Yazıcılar İçin Tasarlanan Harçlarının Ekstrüde Edilebilirlikleri” El-Cezerî Fen ve Mühendislik Dergisi, Vol. 8, Issue 1; 410-420, 2021.
• 3. Kam, M., Saruhan H., İpekçi, A., “The effect of filling structures on strength of printed products by 3D printers,” Duzce University Journal of Science & Technology, Vol. 7, Issue 3, 951–960, 2019.
• 4. Kam, M., Saruhan, H., İpekci A., “Investigation the effects of 3D printer system vibrations on mechanical properties of the printed products,” Sigma Journal of Engineering and Natural Sciences, Vol. 36, Issue 3, 655–666, 2018.
• 5. Nerella, V.N., Krause M., Mechtcherine, V., "Direct printing test for buildability of 3D-printable concrete considering economic viability", Autom. Constr. Vol. 109, Issue 102986, 2020.
• 6. Ivanova, I., Ivaniuk E., Bisetti, S., Nerella, V.N., Mechtcherine, V., "Comparison between methods for indirect assessment of buildability in fresh 3D printed mortar and concrete", Cement and Concrete Research, Vol. 156, 1-17, 2022.
• 7. Wi, K., Wang, K., Taylor, P.C., Laflamme, S., Sritharan, S., Qin, H., "Properties and microstructure of extrusion-based 3D printing mortar containing a highly flowable, rapid set grout", Cement and Concrete Composites, Vol. 124, 1-12, 2021.
• 8. Suiker, A.S.J., Wolfs, R.J.M., Lucas, S.M., Salet, T.A.M., "Elastic buckling and plastic collapse during 3D concrete printing", Cement and Concrete Research, Vol. 135, Issue 106016, 2020.
• 9. Samouh H., Rozière E., Loukili A., "The differential drying shrinkage effect on the concrete surface damage: Experimental and numerical study", Cement and Concrete Research, Vol. 102, 212-224, 2017.
• 10. Buswell R.A., Leal de Silva W.R., Jones S.Z., Dirrenberger J., "3D printing using concrete extrusion: a roadmap for research", Cement and Concrete Research, Vol. 112, 37–49, 2018.
• 11. Marchon D., Kawashima S., Bessaies-Bey H., Mantellato S., Ngo S., "Hydration and rheology control of concrete for digital fabrication: potential admixtures and cement chemistry", Cement and Concrete Research, Vol. 112, 96–110, 2018.
• 12. Ma S., Kawashima S., "Rheological and water transport properties of cement pastes modified with diutan gum and attapulgite/palygorskite nanoclays for 3B concrete printing", RILEM Int. Conf. Concr. Digit. Fabr., Springer, 61–69, 2018.
• 13. Luhar S., Suntharalingam T., Navaratnam S., Luhar I., Thamboo J., Poologanathan K., Gatheeshgar P., "Sustainable and renewable bio-based natural fibres and its application for 3B printed concrete: A review", Sustainability, Vol. 12, Issue 24; 1-31, 2020.
• 14. Moelich G.M., Kruger J., Combrinck R., "Plastic shrinkage cracking in 3D printed concrete", Composites Part B: Engineering, Vol. 200, Issue 108313, 2020.
• 15. Zhang H., Xiao J., "Plastic shrinkage and cracking of 3D printed mortar with recycled sand", Construction and Building Materials, Vol. 302, 124405, 1-11, 2021.
• 16. Shahmirzadi M.R., Gholampour A., Kashani A., Ngo T.D., "Shrinkage behavior of cementitious 3D printing materials: Effect of temperature and relative humidity", Cement and Concrete Composites, Vol. 124, Issue 104238, 2021.
• 17. Le T.T., Austin S.A., Lim S., Buswell R.A., Law R., Gibb A.G.F., Thorpe T., "Hardened properties of high-performance printing concrete", Cement and Concrete Research, Vol. 42, 558–566, 2012.
• 18. EN 12617–4, "Products and Systems for the Protection and Repair of Concrete Structures. Test Methods, Determination of Shrinkage and Expansion", British Standard Institution, Milton Keynes, UK, 2002.
• 19. Zhang Y., Zhang Y., She W., Yang L., Liu G., Yang Y., "Rheological and harden properties of the high-thixotropy 3D printing concrete", Construction and Building Materials, Vol. 201, 278–285, 2019.
• 20. Yang J., Wang Q., Zhou Y., "Influence of Curing Time on the Drying Shrinkage of Concretes with Different Binders and Water-to-Binder Ratios", Advances in Materials Science and Engineering, Article ID 2695435, 1-10, 2017.