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Öğe THE EFFECTS OF CONTROLLED-PERMEABLE FORMWORKS ON THE SURFACE HARDNESS OF THE CONCRETE(Gazi Univ, Fac Engineering Architecture, 2008) Arslan, Metin; Subaşı, SerkanThe purpose of this study was to investigate the effects of different formworks on the surface hardness of the concretes under long-term atmospheric conditions. Ten wall formworks (2 Scots pine, 2 Black poplar, 1 stell iron and 5 plywood) with different surface properties were constructed in this study. Three out of five plywoods were prepared with holes and canals and these prepared formworks were covered with different types of geotextile liners. The concrete was casted into all formworks under the same conditions. The prepared concrete walls were kept under atmospheric conditions for six years in horizontal position. Every year, the surface hardness of the concrete walls were determined with a Schmidt hammer. The findings were evaluated regarding the climate conditions. The findings of this study indicated that the concrete blocks containing geotextile liners were less affected from climate conditions. In addition, formworks with liner gave better surface hardness compared to the others.Öğe THE EFFECTS OF FORMWORK SURFACE PROPERTIES ON CONCRETE CARBONATION(Gazi Univ, Fac Engineering Architecture, 2008) Subaşı, Serkan; Arslan, MetinThe aim of this study is to investigate the effects of formwork surface properties on concrete carbonation. Seven concrete wall formworks with different surface properties, Scotch pine, Black poplar, sheet iron and four plywoods, were constructed in this study. Tree out of four wall plywood formworks were prepared with drainage channels and holes. The formwork surfaces consisting of drainage channels and holes were covered with different geotextile liners. The concrete were casted into all prepared wall formworks, which were removed after 28 days that the sample blocks were prepared. The blocks were kept under atmospheric conditions for six years. After that, the depths of carbonation were determined using the taken core samples of all blocks. In addition, the pH values were investigated on the concrete powder samples that were obtained from different depth levels of the concrete blocks. The results indicated that formworks including both drainage and liners gave lower carbonation compared to the other formworks. The lowest carbonation was observed with the formwork that was covered with SB-20 geotextile. On the other hand, the highest carbonation was found with the sheet iron formwork.Öğe The effects of various formwork surfaces on the corrosion performance of reinforcing steel in concrete(Wiley-V C H Verlag Gmbh, 2010) Subaşı, Serkan; Arslan, Metin; Durmuş, Gökhanin this study, the effects of various formwork surfaces on the corrosion performance of reinforcing steel in concrete were examined. For this purpose, seven formwork surfaces from populus nigra, pinus silvestris, steel sheet, and four of plywoods were prepared. Three of the plywood formworks were covered with different geotextile liners and drainage channel and holes were drilled on their surfaces. one of the plywood formworks having no processes on its surface was for control. Reinforcing steels were first embedded in formworks and then the concrete was poured. The samples were exposed to corrosion in a way of settling them in 5% NaCl solution. We tested the corrosion potential and bonding strength of the samples. Later, the mass loss and tensile strength were measured on reinforcing bars that were pulled out from the concrete. The chloride content and pH values were also tested on concrete powders. The results indicated that drained-lined formwork (F5 with TB50 + F613 geotextile liner) compared to steel sheet (F4 undrained and unlined) gave 16% lower corrosion and 68% higher bonding strength on reinforcing bars embedded samples, 73% lower mass loss and 4% higher tensile strength on reinforcing bars, and 70% lower chloride content and 4% higher pH on concrete powders. in addition, it was found that the corrosion strength of reinforcing steels in concrete could be increased if drained-lined formworks were utilized.Öğe Kalıp yüzey özelliklerinin betonun karbonatlaşması üzerine etkileri(2008) Subaşı, Serkan; Arslan, MetinBu çalışmanın amacı, kalıp yüzey özelliklerinin betonun karbonatlaşma miktarına etkisini araştırmaktır. Bu amaçla farklı yüzey özelliklerine sahip 7 adet betonarme perde duvar kalıbı hazırlanmıştır. Kalıplarda sarıçam, karakavak, çelik sac ve kontrplak kalıp yüzey malzemesi olarak kullanılmıştır. Kontrplak yüzeyli olarak hazırlanan 4 adet kalıptan 3 tanesinin yüzeyine drenaj kanal ve delikleri açılarak kalıp yüzeyleri farklı geotekstil astarlarla kaplanmıştır. Beton dökümü gerçekleştirildikten 28 gün sonra kalıplar sökülerek beton bloklar 6 yıl boyunca atmosfer şartlarına maruz bırakılmıştır. Daha sonra beton bloklardan alınan karot örnekler üzerinde karbonatlaşma derinliği ve farklı derinliklerden alınan toz örnekler üzerinde ise pH değerleri ölçülmüştür. Sonuç olarak; drenajlı-astarlı kalıplara dökülmüş betonların, sarıçam, karakavak, çelik sac ve kontrplak kalıba dökülen betonlara göre; daha az karbonatlaşma miktarına sahip olduğu, SB-20 geotekstil astarla kaplı olan drenajlı kalıba dökülen betonun en az karbonatlaşma derinliğine sahip olduğu, en fazla karbonatlaşma miktarının çelik sac yüzeyli kalıba dökülen betonda oluştuğu görülmüştür.Öğe Kontrollü geçirgen kalıpların beton yüzey sertliği üzerine etkileri(2008) Arslan, Metin; Subaşı, SerkanBu araştırmanın amacı; farklı yüzey özelliklerine sahip kalıplardan elde edilen ve uzun süreli atmosfer şartlarında maruz bırakılan betonların yüzey sertliklerindeki değişimi araştırmaktır. Değişik yüzey özelliklerine sahip 10 adet perde duvar kalıbı hazırlanmıştır. Bazı kalıp yüzeylerine drenaj kanal ve delikleri açılarak farklı geotekstil astarlarla kaplanmıştır. Bütün kalıplara eşit şartlarda beton dökülmüştür. Elde edilen beton duvarlar yatay pozisyonda 6 yıl süre ile atmosfer şartlarına maruz bırakılmıştır. Beton duvarlara her yıl Schmidt Çekici ile yüzey sertliği deneyi uygulanmıştır. Ayrıca betonun maruz kalmış olduğu iklim koşulları incelenmiştir. Sonuç olarak; yüzeyi geotekstil astarlarla kaplı kalıplardan elde edilen betonların atmosferik etkilerden daha az zarar gördüğü, astarlı kalıplardan üretilen betonların astarsız kalıplara dökülenlerden daha iyi yüzey sertliği değerlerine sahip olduğu görülmüştür.