Atık döküm kumu ile üretilen polimer betonun hızlıtamir malzemesi olarak kullanımının araştırılması
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Date
2020
Authors
Akış, Tolga
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Abstract
Portland çimentosu, çakıl, kum ve sudan oluşan Portland çimentolu beton (PÇB) inşaat sektöründe yaygın olarak kullanılmaktadır. Yangın, sülfat etkisi veya sismik kuvvetlerden dolayı PÇB zarar gördüğünde, hızlı onarım sağlama özelliğinden dolayı polimer beton (PB) iyi bir tamir malzemesi adayıdır. PB, agrega ve bağlayıcı görevi gören termoset bir reçineden meydana gelmektedir. Bu çalışmada atık döküm kumu, epoksi reçine ve pirinç çeltiği külünden üretilen özel bir tip polimer betonun hızlı tamir malzemesi olarak kullanımı araştırılmıştır. Bunun yanı sıra, yüzey pürüzlülüğünün onarım malzemesinin PÇB'ye yapışmasına etkisi de, PÇB yüzeye uygulanan farklı seviyelerdeki yapay pürüzlülükler üzerinden incelenmiştir. Eğimli kesme, yarmada çekme ve çift yüzey kesme gibi deneyler uygulanarak dört farklı yüzey pürüzlülük seviyesine sahip PÇB ile PB arasındaki yapışma dayanımı belirlenmiştir. Yüzeyler, pürüzlülük seviyelerine göre (a) pürüzsüz, (b) tel fırça ile pürüzlendirilmiş, (c) delik delinerek pürüzlendirilmiş ve (d) kumlamayla dövülmüş yüzeyler olarak adlandırılmıştır. Deneylerde genel olarak adhesiv, kohesiv ve karışık türde üç farklı tip hasar gözlenmiştir. Yapılan çalışmada, uygulanan kuvvet tipi ve yönüne bağlı olarak, yüzey pürüzlülüğü alanı kadar geometrisinin de bağ dayanımında etkili olduğu tespit edilmiştir. Bunlara ek olarak neredeyse tüm numunelerde, PÇB kısmında küçük veya büyük çatlaklar gözlenmiştir ve bu durum kullanılan PB'un yapışma gücünün dikkate değer olduğunu göstermektedir.
Portland cement concrete (PCC) is a material composed of Portland cement, gravels, sand, and water and used for construction purposes. When it is damaged due to fire, sulfate attacks, or seismic forces, polymer concrete (PC) is one good candidate as a rapid repair material for PCC. PC is a material that consists of aggregates and a thermosetting resin as a binder. This present study investigates a special kind of PC composed of waste foundry sand (WFS), epoxy resin, and rice husk ash (RHA) as a repair material for PCC. In addition, the effect of surface roughness of PCC surface was investigated by applying different levels of artificial roughness on PCC substrates using various roughening techniques. Several mechanical tests, such as slant shear, splitting tension and bi-surface shear tests were performed in order to determine the bond strength between PCC and PC for four levels of substrate surface roughness. The surfaces were classified according to their roughness level as (a) smooth surfaces, (b) wire-brushed surfaces, (c) hole-drilled surfaces, and (d) sand-blasted surfaces. Overall, three types of failures namely, adhesive, cohesive and mixed failures were observed. It was found that not only the total surface roughness area but also the geometry of the roughness feature has an effect on the bond strength depending on the type of the applied stress and its direction. Furthermore, almost in all tested specimens, major or minor cracks were observed in PCC part and that reflects the significance of adhesive strength of the PC to the substrate.
Portland cement concrete (PCC) is a material composed of Portland cement, gravels, sand, and water and used for construction purposes. When it is damaged due to fire, sulfate attacks, or seismic forces, polymer concrete (PC) is one good candidate as a rapid repair material for PCC. PC is a material that consists of aggregates and a thermosetting resin as a binder. This present study investigates a special kind of PC composed of waste foundry sand (WFS), epoxy resin, and rice husk ash (RHA) as a repair material for PCC. In addition, the effect of surface roughness of PCC surface was investigated by applying different levels of artificial roughness on PCC substrates using various roughening techniques. Several mechanical tests, such as slant shear, splitting tension and bi-surface shear tests were performed in order to determine the bond strength between PCC and PC for four levels of substrate surface roughness. The surfaces were classified according to their roughness level as (a) smooth surfaces, (b) wire-brushed surfaces, (c) hole-drilled surfaces, and (d) sand-blasted surfaces. Overall, three types of failures namely, adhesive, cohesive and mixed failures were observed. It was found that not only the total surface roughness area but also the geometry of the roughness feature has an effect on the bond strength depending on the type of the applied stress and its direction. Furthermore, almost in all tested specimens, major or minor cracks were observed in PCC part and that reflects the significance of adhesive strength of the PC to the substrate.
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İnşaat Mühendisliği, Civil Engineering
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