Silis dumanı katkılı geri kazanılmış agregalı betonların elastisite modüllerinin karşılaştırmalı analizi

Yıl 2018, Cilt: 24 Sayı: 6, 1069 - 1078, 18.12.2018

Özgür Çakır , Hasan Dilbas

Öz

Atık
malzemelerin geri dönüşümü, doğal kaynakların korunmasından ve yaşanabilir bir
gelecek için öncülük edecek çevresel etkilerinin azaltılmasından dolayı, yapı
sektöründe sürdürülebilirlik kavramı üzerinde önemli bir etkiye sahiptir. Yapım
işlemleri, genellikle, yüksek miktarda yapı ve yıkıntı atığı (YYA) oluşumuyla
sonuçlanmakta ve geri dönüşüm işlemi ardından YYA bertaraf edilmesi için inşaat
mühendisliği uygulamalarında, özellikle geri kazanılmış agregalı betonda
(GKA-B), geri kazanılmış agrega (GKA) olarak kullanımı büyük potansiyele
sahiptir. Bu bağlamda, çeşitli oranlarda GKA (0-30-40-70-100%) ve çeşitli oranlarda silis dumanı (SD) (0-5-10%) içeren beton
karışımları GKA-B‘ nun elastisite modülünü belirlemek üzere üretilmiştir. Bu
çalışma, çeşitli standartlar tarafından ve çeşitli araştırmacılar tarafından
önerilen teorik elastisite modülü formüllerince hesaplanan GKA-B elastisite
modülü değerlerinin deneysel olarak elde edilen GKA-B elastisite modülü
değerlerine yakınlıklarının olup olmadığını göstermeyi amaçlamaktadır. Analitik
ve istatistik değerlendirmeler yapılmıştır. Sonuç olarak, GKA oranının
betondaki artışı ile elastisite modülü azalmaktadır. GKA-B’da SD kullanımı
elastisite modülünü ve basınç dayanımını artırmaktadır. İrdelenen standartlar
göz önüne alındığında, Amerikan standardı (ACI 318-05) elastisite modülünü deneysel sonuçlara göre, en yüksek standart
sapma göstermesine rağmen, yakın tahmini vermektedir. Diğer taraftan
araştırmacılar tarafından GKA-B elastisite modülü tahmini için önerilen
denklemler, irdelenen standartların ve deney sonuçlarının üzerinde sonuç
vermektedirler. SD içeren ve içermeyen betonlar için bir elastisite modülü
denklemi de bu çalışmada önerilmektedir.

Anahtar Kelimeler

Geri kazanılmış agregalı beton (GKA-B), Silis dumanı (SD), Elastisite modülü, Standartlar

A comparative analysis of elasticity modulus of recycled aggregate concrete with silica fume

Öz

Recycling
of waste materials has significant influence on the concept of sustainability
in construction industry due to the conservation of natural resources and
minimizing the environmental impacts which leads to habitable future.
Construction activities, in general, result in huge amount of construction and
demolition waste (C&DW) and C&DW has a great potential for possible
disposal as recycled aggregate (RA) in civil engineering applications,
especially in recycled aggregate concrete (RAC), after recycling processes. In
this concept, concrete mixtures including RA and silica fume (SF) at various
ratios (0-30-40-70-100%) and (0-5-10%), respectively, are produced in order to
determine the elasticity modulus of RAC. This work aims to examine elasticity
modulus of RAC determined according to the formulas of standards and studies.
Analytical and statistical assessments are performed and experimental and
theoretical results are compared. When RA content increases, the elasticity
modulus decreases. SF utilization in RAC improves the mechanical parameters
(elasticity modulus and compressive strength). The American standard (ACI
318-05) predicts the elasticity modulus approximately to the experimental
results although it has the highest relative standard deviations in comparison
to the regarded standards. Moreover, proposed equations for RAC by researchers
estimate the elasticity modulus values greater than those of standards and the
experimental results. An elasticity modulus equation is also proposed for RAC
with and without SF.

Anahtar Kelimeler

Recycled aggregate concrete, Silica fume, Elasticity modulus, Standards

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