Relationship between Reinforcement Diameter and Bond Stress in High Performance Lightweight Concrete

Year 2021, Issue: 23, 851 - 860, 30.04.2021

Esra Tugrul Tunc , Kürşat Esat Alyamaç , Ragip İnce , Zülfü Ulucan

https://doi.org/10.31590/ejosat.884123

Abstract

High performance lightweight concrete (HPLC) is a new and original research in structural engineering. Due to the high risk of earthquakes, which is one of the biggest disasters today, the need for HPLCs has increased. The purpose of this study is to experimentally research concrete-reinforcement bond for the change parameters such as different reinforcement diameters and different embedded lengths. For this purpose, HPLCs with different mix ratios and different concrete components were prepared by using pumice aggregates. Within this scope, HPLC beam specimens of 100×180×800 mm dimensions were prepared and produced specimens were subjected to the Standard Belgium Hinged Beam (SBHB) test. There are limited studies in the literature on the investigation of the bond properties of HPLC beams with this test. The mentioned study draws attention with this aspect. In the present study, ribbed steel reinforcement bars with different diameters were used. The beam specimens were produced considering the different embedded lengths for each reinforcement diameter. The bond tests were performed. Using the load applied vertically and read with the help of the load cell in the experiment, the bond stress occurring in the reinforcement was calculated with the help of the force in the reinforcement indirectly found. As a result of the experiments, it has been determined that there is a significant relationship between bond stress and reinforcement diameter and embedded length. It has been determined that the bond stress decreases with the increase of reinforcement diameter and embedded length.

Keywords

High Performance Lightweight Concrete (HPLC), Beam, Bond stress, Reinforcement

Supporting Institution

TÜBİTAK

Project Number

120M104

Thanks

This study was carried out within the scope of the Scientific and Technological Research Council of Turkey (TUBITAK). We gratefully acknowledge the financial support provided by TUBITAK to the Research Project 120M104.

Yüksek Performanslı Hafif Betonlarda Donatı Çapı ile Aderans Gerilmesi Arasındaki İlişki

Abstract

Yüksek performanslı hafif beton (YPHB), yapı mühendisliğinde yeni ve güncel bir konudur. Kalıcı ve uzun ömürlü yapılar inşa edebilmek için YPHB’lere ihtiyaç vardır. YPHB ile kullanılacak toplam beton miktarı azaltılarak binaların hafiflemesi mümkündür. Günümüzde en büyük afetlerden olan deprem riskinin yüksek olması nedeni ile YPHB’lere olan ihtiyaç artmıştır. Betonarmenin varlığı, aderans olayına bağlıdır. YBHB’lerin aderans gerilmesi birçok parametreye bağlı olarak değişmektedir. Bu çalışmanın amacı, farklı donatı çapı ve farklı kenetlenme boyu gibi değişim parametreleri ile YPHB’lerin beton-donatı aderansı arasındaki ilişkinin deneysel olarak belirlenmesidir. Bu amaçla pomza agregaları kullanılarak farklı karışım oranları ve farklı beton bileşenlerine sahip YPHB’ler hazırlanmıştır. Bu kapsamda 100×180×800 mm boyutlarında YPHB kiriş numuneler hazırlanmış ve üretilen numuneler Standart Belçika Mafsallı Kiriş (BMK) deneyine tabi tutulmuştur. YPHB kirişlerin aderans özelliklerinin Standart Belçika Mafsallı Kiriş deneyi ile araştırılması konusunda literatürde sınırlı sayıda çalışma bulunmaktadır. Söz konusu çalışma bu yönü ile dikkat çekmektedir. Mevcut çalışmada Ø8 ve Ø10 çaplarında nervürlü çelik donatı çubukları kullanılmış ve her bir donatı çapı için 10Ø ve 20Ø kenetlenme boyları dikkate alınarak BMK numuneleri üretilmiş ve aderans deneyleri yapılmıştır. Deneyde düşey olarak uygulanan ve yük hücresi yardımı ile okunan P yükü kullanılarak dolaylı olarak bulunan donatıdaki F kuvvetinin yardımı ile donatıda meydana gelen aderans gerilmesi hesaplanmıştır. Yapılan deneyler sonucunda aderans gerilmesi ile donatı çapı ve kenetlenme boyu arasında önemli bir ilişki olduğu tespit edilmiştir. Aderans gerilmesinin beton basınç dayanımının artmasıyla arttığı, donatı çapı ve kenetlenme boyunun artması ile azaldığı belirlenmiştir.

Keywords

Yüksek Performanslı Hafif Beton, Belçika Mafsallı Kiriş, Aderans Gerilmesi, Donatı Çapı, Kenetlenme Boyu

Project Number

120M104

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