E-postama gönder THE EFFECT OF EMBEDDING LENGTH AND CONCRETE COVER THICKNESS ON BOND STRENGTH IN BASALT AGGREGATE CONCRETE
Öz
THE EFFECT OF EMBEDDING LENGTH AND CONCRETE COVER THICKNESS ON BOND STRENGTH IN BASALT AGGREGATE CONCRETE
Abstract
This study investigated the effect of concrete cover thickness and embedding length on bond strength in concretes depending on the bonding properties of basalt aggregate in cement matrix. B420C construction steel with a diameter of 12 mm was centrally embedded in concrete samples for bond tests. CEM I 42.5 R cement and basalt aggregate were used for the production of concrete samples. 'Lollipop’-shaped reinforced concrete samples were prepared to make sure that concrete cover thickness is equal in the reinforcement circumference for the bond tests. These samples were prepared in nine different sizes with three different diameters and at three different height/diameter ratios. The results show that embedding depths of reinforcements in the samples with a diameter of 50 mm have no significant effect on bond strength. It has, therefore, been determined that the cylinder diameter of the concrete should be greater than 50 mm.
Keywords: Bond, pull-out, concrete cover thickness, embedding length.
BAZALT AGREGALI BETONDA KENETLENME BOYUNUN VE BETON ÖRTÜ KALINLIĞININ ADERANS GERİLMESİNE ETKİSİ
Özet
Bu çalışmada çimento matrisi içerisinde bazalt agregasının yapışma özelliğine bağlı olarak aderans dayanımına beton örtü kalınlığının ve kenetlenme boyunun etkisi araştırılmıştır. Aderans deneyleri için beton örneklerine 12 mm çapında B420C tipi inşaat çeliği merkezi olarak gömülmüştür. Beton örneklerin üretimi için CEM I 42.5 R tipi çimento ve bazalt agregası kullanılmıştır. Aderans testlerinde beton örtü kalınlığının betonarme ortamda eşit olması için Lolipop şekilli beton örnekleri hazırlanmıştır. Bu örneklerde; üç farklı çapta ve üç farklı narinlik (boy/çap) oranlarında olmak üzere dokuz farklı boyutta hazırlanmıştır. Sonuç olarak 50 mm çaplı örneklerde donatıların gömülme derinliklerinin aderans gerilmelerinde kayda değer bir değişikliğe neden olmamalarından ötürü beton silindir çapının 50 mm üzerinde olması gerektiği belirlenmiştir.
Anahtar Kelimeler: Aderans, pull-out, beton örtü kalınlığı, kenetlenme boyu.
Anahtar Kelimeler
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