Yapı elemanlarında kullanılan atık lastiklerin ısıl performansının incelenmesi

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.