Effects of Fines Content and Type, and Coarse Aggregate Size on the Workability Properties of Self-Compacting Concretes

Year 2022, Volume: 22 Issue: 1, 187 - 198, 28.02.2022

Hayati Hilmioğlu , Cengiz Sengül Hulusi Özkul

https://doi.org/10.35414/akufemubid.1025031

Abstract

Self-compacting concretes (SCC) were prepared with 10 mm and 16 mm coarse aggregate sizes and using limestone powder (LS) and fly ash (FA) as fine material. The amount of fines in concrete, where the amount of cement and the water / cement ratio were kept constant, was increased in 36 dm3 increments up to 108 dm3. The effect of the type and amount of fines and coarse aggregate size on flowing, passing, segregation and blocking properties of SCCs were examined. Experimental results indicated that slump flow increases with increasing fines content. Opposite to this, V-funnel times increased with increasing fines content, however, they were shorter for FA than those of LS, which can be attributed the balling and lubrication effect of the former and arching effect of the latter particles. For both fines, higher segregation was obtained for SCCs with 16 mm than those of 10 mm. The SCCs with low amount of fines displayed higher blocking step in general and FA-added concretes had higher segregation than those of LS. The difference in the behaviors of LS and UK added concretes is most probably due to the differences in the particle shape and surface properties.

Keywords

SCC, Slump flow, Passing ability, Segregation, Blocking, Fines

Supporting Institution

TÜBİTAK and ITU BAP

Project Number

TUBİTAK-MAG-115M483 and BAP-Project No. 39476

Thanks

The authors wish to thank the Scientific and Technological Research Council of Turkey (TUBITAK) for providing support for this study (MAG-115M483). The authors also thank ITU. BAP (Project No. 39476) for their support.

İnce Malzeme Miktarı ve Cinsi ile İri Agrega Boyutunun Kendiliğinden Yerleşen Betonların İşlenebilirlik Özelliklerine Etkisi

Abstract

Kendiliğinden yerleşen betonlar (KYB), 10 mm ve 16 mm iri agrega boyutlarında ve ince malzeme olarak kalker tozu (KT) ve uçucu kül (UK) kullanılarak hazırlanmıştır. Çimento miktarı ve su/çimento oranının sabit tutulduğu betonlardaki ince malzeme miktarı 36 dm3'lük artışlarla 108 dm3'e kadar çıkarılmıştır. İnce malzeme tipi ve miktarının ve iri agrega boyutunun KYB'lerin akma, dar açıklıktan geçme, ayrışma, bloke olma gibi özelliklerine etkisi incelenmiştir. Deneysel sonuçlar, artan ince malzeme içeriği ile çökme akışının arttığını göstermiştir. Bunun tersine, artan ince tane içeriği ile V-hunisi süreleri artmıştır, ancak UK için KT'den daha kısa süreler elde edilmiştir. UK küresel tanecik yapısında olduğu için beton karışımı içinde yağlayıcı etki gösterir. Her iki ince malzeme için de 16 mm'lik KYB'ler için 10 mm'lik olanlardan daha yüksek segregasyon elde edilmiştir. Düşük miktarda ince malzeme içeren KYB'ler genel olarak daha yüksek blokaj adımı sergilemiştir ve UK katkılı betonlar KT'ye göre daha yüksek ayrışma göstermiştir. KT'li ve UK’lı KYB’lerde gözlenen bu farklı davranış muhtemelen tane şekli ve yüzey özelliklerindeki farklılıklardan kaynaklanmaktadır.

Keywords

KYB, Yayılma akış, Geçme yeteneği, Ayrışma, Blokaj, İnce malzeme.

Project Number

TUBİTAK-MAG-115M483 and BAP-Project No. 39476

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