Investigation of the thermal
performance of waste rubber
as a building element
Journal Name:
- Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi
Keywords (Original Language):
Author Name | University of Author | Faculty of Author |
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Abstract (2. Language):
A great majority of matters, which are considered as
wastes in the world, consist of recyclable materials.
Waste, which is whether industrial or not, is seen as
the biggest problem for both Turkey and World in
the future in terms of the way to eliminate or to get
rid of. One of the most logical solutions of this
problem is to recycle of disposal and waste
materials.
The use of industrial waste rubbers to improve
properties of concrete is quite common way. In this
context, experimental investigations are performed
to obtain new concrete types with relatively high
strength, low density and good thermal and acoustic
properties for energy efficient buildings. For this
purpose, six sets and different types of concrete
samples were prepared with a constant watercement
ratio, and normal aggregates replaced by
Waste rubber concrete aggregates at different
volume fractions such as 10%, 20%, 30%, 40%,
50% and 60% of the total aggregate volume.
Aggregate grading is made by sieve analysis
method.
As a result of the sieve analysis, the amount of
aggregate remaining on each sieve is weighed, and
the amount of aggregate remaining on each sieve is
calculated as a percentage (%), by comparing the
total weight of the sampled weights.
In order to improve the physical and chemical
properties of concrete and to increase the durability
of construction elements, cement and silica fume are
used in concrete production. Super plasticizers and
air entraining additives are used in the production
of concrete with waste rubber. At the same time, a
high proportion of water-reducing/new-generation
super plasticizing concrete admixture material has
been used in order to provide processability and at
the same time to prevent decomposition.
Mechanical tests were all conducted and the hot disk
method was used to establish thermal property
values of concrete samples. As the aggregate ratio
increases, the heat insulation property increases at
high rates. It was determined that the thermal
conductivity of the produced samples decreased by
73.5% for 60 % waste rubber replacement. The
maximum and minimum density values were found to
be in the range of 2434,30 - 1658,99 kg/m3,
respectively. The result reveals that a low weight
waste is required to produce rubber-reinforced
concrete.
Experimental studies on compressive strengths
showed that 95% reduction in compressive strength
of the specimen was found as a result of calculations
made on specimens produced with normal concrete
at 60% waste rubber. Such reductions in the bulk
densities can have significant advantages from the
point of earthquake resistance; thus, the strong
vibrations during the earthquake can be absorbed by
using these structures.
It is seen that the ultrasonic pulse velocity of the
normal concrete is 4,673 km / s while that the
ultrasonic pulse velocity of the specimens produced
with 60% waste rubber is 1,626 km / s. Hence, sound
insulation was improved by 65.2%.
As a result, the usage of waste rubber aggregate in
concrete is very effective on the mechanical and
thermal properties for lightweight concretes and.in
this study, the relations between the mechanical and
thermal properties were determined. The main focus
of this paper was to investigate the utilization of
waste materials in industrial production.
Consequently, the reuse of wastes provides
reduction of the environmental threats caused by
waste tires, introduction of an alternative source to
aggregates in concrete and also contributing to
lower insulation cost.
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Abstract (Original Language):
Dünya üzerinde atık olarak değerlendirilen maddelerin büyük bir kısmı geri dönüştürülebilir malzemelerden
oluşmaktadır. Atık ya da atıl malzemelerin depolanması ya da uzaklaştırılması Türkiye ve Dünyada
geleceğin en büyük problemlerinden biri olarak görülmektedir. Bu problemin en mantıksal çözümlerinden
biri atık ya da atıl malzemelerin yeniden kullanılabilirliğinin sağlanabilmesidir. Bir endüstriyel atık olan
lastiklerin, beton özeliklerini geliştirmek amacıyla betonun içine katılması oldukça yaygın olarak
kullanılmaktadır. Bu doğrultuda, bu çalışmada, enerji verimli binalar için nispeten yüksek mukavemet, düşük
yoğunluklu, yüksek ısı ve ses yalıtımı olan yeni beton tipleri elde etmek için deneysel bir çalışma
gerçekleştirilmiştir. Bu amaçla, sabit su-çimento oranında, normal agrega yerine hacimce %10, %20, %30,
%40, %50 ve %60 oranlarında atık lastik agregası kullanılarak çeşitli beton numuneleri hazırlanmıştır.
Deneysel çalışmalarda birim ağırlıkları değişen toplam 6 seri beton üretilmiştir. Üretilen tüm numunelerin
mekanik testleri yapılmış ve ısıl özellikleri sıcak disk yöntemi ile ASTM ve EN standartlarına uygun olarak
belirlenmiştir. Deneysel çalışmaların sonuçlarına göre kullanılan agreganın elde edilen betonun
mukavemetini ve yoğunluğunu düşürdüğü, buna karşı ısı ve ses yalıtım özelliğini yüksek oranda arttırdığı
görülmüştür. Bu çalışmada dünyada ve ülkemizdeki endüstriyel atık ürünlerinin mühendislik
çalışmalarındaki sonuçları derlenerek yorumlanmıştır.
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