Comparison of the Effect of Nano Cellulosic Additives on Rheological Parameters for 3D Printable Concretes

Ayşe Karoğlu; Furkan Türk; Ülkü Sultan Keskin

Makale detayları

Comparison of the Effect of Nano Cellulosic Additives on Rheological Parameters for 3D Printable Concretes

Yazarlar:

Ayşe Karoğlu | Furkan Türk | Ülkü Sultan Keskin

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

İnşaat Mühendisliği

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.6 Issue 3, pp.1796-1809

Belge Tipi:

Makale

Yayın Tarihi:

4/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001304687

pISSN:

2687-3729

Anahtar kelimeler:

Özet:

 In 3D printable concretes, fresh requirements such as pumpability, workability, constructability are affected by the rheological properties of the mixture. High yield stress and high viscosity cause blockages in the transmission line, while low yield stress and low viscosity cause the mixture to not provide the required shape stability. Even if the mixture to be printed has suitable rheological parameters, it is very important in terms of workability that it can be preserved over time. Here, cellulose nanocrystals and cellulose nanofibers were used in cement paste mixtures in order to ensure sufficient workability time in 3D printable concrete mixtures, and also to ensure that the originally designed rheological properties can be maintained over time. The Bingham model, which was created as a result of the measurements made with the viscometer device, was used to evaluate the rheological parameters of the mixes containing cellulose nanocrystal and cellulose nanofiber additions in varied amounts. As a result of the study, it was determined that the yield stress of the reference sample increased by 290 45 minutes after the preparation of the mixture, while this rate decreased to 135 in the use of cellulose nanocrystals and to 79 in the use of cellulose nanofibers. While it increased by 205 at the end, this rate decreased to 37 with cellulose nanofibers and to 68 with cellulose nanocrystals. When the different additives are compared, it was concluded that cellulose nanofiber may be more effective than cellulose nanocrystal in controlling the increase in viscosity and yield stress over time.

 In 3D printable concretes, fresh requirements such as pumpability, workability, constructability are affected by the rheological properties of the mixture. High yield stress and high viscosity cause blockages in the transmission line, while low yield stress and low viscosity cause the mixture to not provide the required shape stability. Even if the mixture to be printed has suitable rheological parameters, it is very important in terms of workability that it can be preserved over time. Here, cellulose nanocrystals and cellulose nanofibers were used in cement paste mixtures in order to ensure sufficient workability time in 3D printable concrete mixtures, and also to ensure that the originally designed rheological properties can be maintained over time. The Bingham model, which was created as a result of the measurements made with the viscometer device, was used to evaluate the rheological parameters of the mixes containing cellulose nanocrystal and cellulose nanofiber additions in varied amounts. As a result of the study, it was determined that the yield stress of the reference sample increased by 290 45 minutes after the preparation of the mixture, while this rate decreased to 135 in the use of cellulose nanocrystals and to 79 in the use of cellulose nanofibers. While it increased by 205 at the end, this rate decreased to 37 with cellulose nanofibers and to 68 with cellulose nanocrystals. When the different additives are compared, it was concluded that cellulose nanofiber may be more effective than cellulose nanocrystal in controlling the increase in viscosity and yield stress over time.

 In 3D printable concretes, fresh requirements such as pumpability, workability, constructability are affected by the rheological properties of the mixture. High yield stress and high viscosity cause blockages in the transmission line, while low yield stress and low viscosity cause the mixture to not provide the required shape stability. Even if the mixture to be printed has suitable rheological parameters, it is very important in terms of workability that it can be preserved over time. Here, cellulose nanocrystals and cellulose nanofibers were used in cement paste mixtures in order to ensure sufficient workability time in 3D printable concrete mixtures, and also to ensure that the originally designed rheological properties can be maintained over time. The Bingham model, which was created as a result of the measurements made with the viscometer device, was used to evaluate the rheological parameters of the mixes containing cellulose nanocrystal and cellulose nanofiber additions in varied amounts. As a result of the study, it was determined that the yield stress of the reference sample increased by 290 45 minutes after the preparation of the mixture, while this rate decreased to 135 in the use of cellulose nanocrystals and to 79 in the use of cellulose nanofibers. While it increased by 205 at the end, this rate decreased to 37 with cellulose nanofibers and to 68 with cellulose nanocrystals. When the different additives are compared, it was concluded that cellulose nanofiber may be more effective than cellulose nanocrystal in controlling the increase in viscosity and yield stress over time.

 3D yazdırılabilir betonlarda pompalanabilirlik, çalışılabilirlik, inşa edilebilirlik gibi taze haldeki gereksinimler karışımın reolojik parametrelerinden etkilenmektedir. Yüksek akma gerilmesi ve yüksek viskozite, iletim hattında tıkanmalara neden olurken, düşük akma gerilmesi ve düşük viskozite ise karışımın gerekli şekil stabilitesini sağlayamamasına neden olmaktadır. Basılacak karışım uygun reolojik parametrelere sahip olsa dahi, bunu zamanla koruyabilmesi çalışılabilirlik süresi açısından oldukça önem arz etmektedir. Burada, 3D yazdırılabilir beton karışımlarda yeterli çalışılabilirlik süresini sağlamak, ayrıca başlangıçta tasarlanan reolojik özellikleri zamanla korunabilmesini sağlamak amacıyla, çimento pastası karışımlarında selüloz nano kristal ve selüloz nanolif kullanılmıştır. Çeşitli oranlarda selüloz nano kristal ve selüloz nano lif katkısı içeren karışımların reolojik parametreleri viskozimetre cihazı ile yapılan ölçümler sonucunda oluşturulan Bingham modeli ile belirlenmiştir. Çalışma sonucunda, referans numunesinin akma gerilmesi karışımın hazırlanması anından 45 dakika sonra 290 artarken, selüloz nano kristal kullanımında bu oranın 135e, selüloz nano lif kullanımında ise 79a kadar düştüğü tespit edilmiştir, viskoziteye bakıldığında ise referans numunesi 45 dakikalık süre sonunda  205 artış gösterirken bu oran selüloz nanolif ile 37ye selüloz nanokristal ile 68e kadar düşmüştür. Farklı katkılar kıyaslandığında ise, viskozite ve akma gerilmesinin zamanla artışının kontrol edilmesinde, selüloz nano lifin selüloz nano kristale göre daha etkili olabileceği çıkarımına varılmıştır.

Makale detayları

Comparison of the Effect of Nano Cellulosic Additives on Rheological Parameters for 3D Printable Concretes

Yazarlar:

Ayşe Karoğlu | Furkan Türk | Ülkü Sultan Keskin

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

İnşaat Mühendisliği

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.6 Issue 3, pp.1796-1809

Belge Tipi:

Makale

Yayın Tarihi:

4/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001304687

pISSN:

2687-3729

3D Printable Concrete

Rheology

Yield Stress

Viscosity

Cellulose nanocrystal

Cellulose nanofiber3D Yazdırılabilir beton

Reoloji

Akma Gerilmesi

Vizkozite

Selüloz nanokristal

Selüloz nanolif

Sayı

Makale detayları

Yazarlar: Ayşe Karoğlu | Furkan Türk | Ülkü Sultan Keskin

Yayıncı: Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar: İnşaat Mühendisliği

Dergi: Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.6 Issue 3, pp.1796-1809

Belge Tipi: Makale

Yayın Tarihi: 4/2023

Belge Dili: İngilizce

Document ID (Org No.): 2001304687

pISSN: 2687-3729

Sayı

Yazarlar:

Ayşe Karoğlu | Furkan Türk | Ülkü Sultan Keskin

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

İnşaat Mühendisliği

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.6 Issue 3, pp.1796-1809

Belge Tipi:

Makale

Yayın Tarihi:

4/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001304687

pISSN:

2687-3729