Asphalt recycling efforts are increasing in order to reduce the effects of high energy and rawmaterial consumption in the asphalt sector. One of the most common methods for using oldasphalt material, which still retains some value, is recycling with foam bitumen.In practice, for the preparation and evaluation of cold mixes produced using foam bitumen, ITS(Indirect Tensile Strength) and MR (Resilient Modulus) methods are generally used. Amongthese methods, ITS is mostly applied for the evaluation of the materials optimum percentagesvalues and MR test is also used for the evaluation of mixture performance.In the experimental study, firstly for the cold mixes prepared with foam bitumen, optimum foambitumen values of the production series were determined by ITS test. Then, reproductions weremade for these optimum values and resilient modulus values were determined. It was found thatthe ITS and MR values were significantly affected by the material gradation and this showedthe opposite tendency for the materials with the same gradation. The type of active filler waseffective the same as the values of the mixtures on ITS and MR. Especially, the MR resultswere affected by the bitumen grade. As a result of the study, evaluation limit values; 225 kPafor ITSDRY value, 150 kPa for ITSWET value and 70% for TSR, 400 MPa resilient modulus valueand 0.21 layer coefficient value are recommended for FBSM (Foam Bitumen StabilizedMaterial).

Teknolojik gelişmeler sayesinde asfalt üretim sıcaklıkları düşürülerek sıcak karışımlara benzer performanslı karışımlar elde edilebilmektedir. Sıcak karışım asfaltların malzemelerinin yani agrega ve bitümün yüksek sıcaklıklarda ısıtılması nedeniyle yarattıkları olumsuz çevresel etkiler, üretim maliyetlerinde meydana gelen sürekli artış ve hammadde kaynaklarındaki azalma nedenleriyle asfalt üretim sıcaklıklarının düşürülmesi eğilimi ve malzemelerin geri kazanımının popülerliği giderek artmaktadır.Köpük bitüm ve geri kazanılmış/doğal agrega kullanılarak uygulanan köpük bitümle geri kazanım yöntemi, çevresel ve ekonomik olarak avantajları olan bir yöntemdir. Köpük bitümle uygun bir karışım hazırlayabilmek için ilk aşama, karışımda kullanılacak bitümün en ideal köpürme özelliklerinin (genleşme oranı ve yarılanma süresi) doğru şekilde belirlenebilmesidir. Bu nedenle çalışmada, farklı asfalt çimentolarının köpürme özellikleri deneysel olarak belirlenmiştir. Ayrıca deneylerde kullanılan bitümlerin köpürme özellikleri Bulanık Mantık ve ANFIS yöntemleri kullanılarak modellenmiş ve sonuçlar deneysel olarak elde edilen verilerle kıyaslanmıştır.Elde edilen veriler ışığında kullanılan tüm bitümlerin farklı köpürtme su yüzdeleri için kullanımlarının literatürde önerilen minimum köpürme özelliklerini sağladığı ve kullanılan tahminleme yöntemlerinin benzer sonuçlarla deneysel verileri desteklediği sonucuna ulaşılmıştır.

In composite reinforced concrete elements formed by concrete and rebar, only if these two materials work together, reinforced concrete elements can fully function. The significant factor that will ensure working together is the bond strength, which is called adherence. The higher the value of this force, the harder the rebar is to pull out from the concrete. In this experimental study, the effect of concrete additives and aggregate type on the bond strength and the amount of elongation of the reinforcement without stripping from the concrete was investigated. For this purpose, 28-day compressive strength and adherence force and reinforcement elongation amounts of the concrete mixtures produced by using mineral, chemical and fiber additives for two different aggregate series, crushed stone and gravel, and two different cement dosages, were observed. In addition, by using 3 different rebar in terms of diameter and surface properties, the effect of these properties on concrete-rebar adherence was revealed. As a result of the study, the use of crushed stone aggregate, hyperplasticizer additive, mineral additive and ribbed rebar with 18mm diameter increased the bond strength compared to the reference samples.

The course of turned of bituminous pavement layers into hot mix asphalt (HMA) layers has been increasing day by day all over the world. Bituminous surface treatment that contains consirable amount of aggregate and bitumen, is an important source of recycling that offers a great amount of pavement materials intead of virgin material usage on pavement consruction. In the study, it was aimed to investigate the usability of bituminous surface layer treatment in the base layers of the HMA roads by mixing with foam bitumen and active filler materials in order to eliminate the potential performance degradation that will be encountered when it is recycled due to the low bitumen percentage compared to hot mix asphalt and the wear of the aggregate due to climatic conditions and traffic loads over time. The study conducted that intends to technically evaluate the cold recycling of bituminous surface treatment of roads with foam bitumen and active filler materials; for 70/100 bitumen grade, 5 different bitumen mixes were prepared and ideal bitumen percentage was investigated for this bitumen grade. The effect of bitumen percentage on mixture performance was evaluated with 50/70-100/150-160/220 bitumen grades and mixtures were prepared in single bitumen ratio (2.5%). It was investigated that active fillers will give suitable results for foam bituminous mixtures by preparing mixtures for three different active fillers; cement, hydrated lime and fly ash. To evaluate all these productions, ITS, unconfined compressive strenght, triaxial resilient modulus and asphalt permanent deformation tests were performed. The results obtained showed that production made using 2% foam bitumen and 1% was found suitable for moisture sensitivity and structural stability. Recycling of bituminous surface treatment using foam bitumen and cement is an environmentally and economically beneficial method by reducing both waste and raw material consumption.