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YALITIMLI DIŞ DUVARLARDA KULLANILAN DIŞ CEPHE KAPLAMALARININ UYUMLULUK ÖZELLİKLERİNİN DEĞERLENDİRİLMESİ

COMPATIBILITY ASSESSMENT OF EXTERIOR FINISH COATS FOR INSULATED WALLS

Journal Name:

Publication Year:

DOI: 
10.4305/METU.JFA.2013.1.5
Abstract (2. Language): 
New approaches are emerging in contemporary wall construction as a result of improved understanding of building materials and their behaviour. Not so long ago, the accepted practice was to create impermeable exterior walls by using moisture-proof and vapour-proof layers in their sectional compositions. However, any failure, such as tiny cracks in any one of these impermeable layers, causes accumulation of entrapped moisture which could not escape by evaporation from the wall surface (Hughes, 1986; Massari and Massari, 1993; Richardson, 2001). This results in a decrease in the lifetime of building materials, visible defects on wall surfaces, such as discoloration, cracking, scaling and flaking on finish coats, and unhealthy interiors (Bochen et al., 2005). The concept of the “breathing wall”, therefore, gained importance in the last few decades and external wall compositions, allowing the passage of water vapour back and forth through it, were started to be constructed. Along with this, energy efficient buildings and improvement of construction technology in this regard became a current issue in contemporary buildings. In addition to installing more efficient fuelburning equipment, the use of both thermal insulation layers and lightweight porous masonry blocks and/or panels for its walls proper, should be incorporated within the compositions of the building envelope. However, due to their high water absorption characteristics, light-weight porous masonry needs to be protected from rainwater by means of watertight protective coatings and/or by water repellents (Andolsun et al. 2006; Kuş, 2004). For these reasons, the exterior finishing systems consisting of under- and finish-coats, having low water permeability but high water vapour permeability properties are necessary.
Abstract (Original Language): 
Yalıtımlı dış duvarlarda kullanılan sentetik emülsiyon, polimer ve çimento esaslı koruyucu dış cephe kaplamaları ve bunları tamamlayan alt katmanların oluşturduğu dış cephe bitirme sistemleri, su buharı geçirimliliği ve esneklik modülü açısından incelenmiştir. Astar, boya ve ısı yalıtım katmanları gibi yalıtımlı dış duvar kesitini tamamlayan diğer katmanların da su buharı geçirimlilikleri incelenmiştir. Yapı bileşenlerini oluşturan malzemelerin tek başlarına özellikleri önemli olmakla birlikte, ilişkide oldukları diğer komşu malzemelerle de uyumlu olmaları önemlidir. İncelenen tüm cephe kaplamalarının yüksek su buharı geçirimliliğine sahip oldukları anlaşılmıştır. Gerçekte su buharı geçirimliliğine direnç indeksi (μ) yüksek olan bu kaplamalar, çok ince tabakalar halinde uygulandıklarından dolayı, yüksek su buharı geçirimli hale gelmişlerdir. Astar veya boya katmanı, cephe kaplama malzemelerinin nefes alma özelliklerini değişen seviyelerde azaltmaktadır. Polistiren ısı yalıtım malzemeleri ile çimento esaslı kaba ve ince sıvalar, duvar kesiti içerisindeki su buharı akışını önemli ölçüde kesen, yani duvarların nefes almasına engel olan katmanlardır. Sentetik emülsiyon ve çimento esaslı cephe kaplamalarının ve bunlarla birlikte kullanılan çimento esaslı sıvaların düşük ama yeterli bir dayanıma sahip oldukları görülmüştür.
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