Mechanical properties of mortar containing recycled asphalt

U radu je korišten reciklirani asfalt kao zamjena dijela cementa za pripremu cementnog kompozita. Dio cementa je zamijenjen prosijanim prahom od recikliranog asfalta u omjeru od 5 do 15 % na masu cementa. Ispitivanje je obuhvatilo analizu gustoće, Blainove specifične ploštine, vrijeme vezivanja, granulometrijski sastav, tlačnu čvrstoću, otpornost na smrzavanje i odmrzavanje, apsorpciju vode te SEM-EDS i XRD analize. Rezultati su pokazali da se dodatkom recikliranog asfalta u cementnom kompozitu smanjuje gustoća, tlačna čvrstoća i Blainova specifična ploština, a povećava se žilavost mješavina.Recycled asphalt is used in this paper as replacement for a part of cement in the production of cement composite. A part of cement was replaced with a sieved recycled asphalt powder in the proportion of 5 to 15 % of the cement weight. The testing comprised the analysis of density, Blaine specific surface area, setting time, particle size distribution, compressive strength, resistance to freezing and thawing, water absorption, and the SEM-EDS and XRD analyses. The results show that the density, compressive strength, and Blaine surface area decrease, and that toughness increases, with an addition of recycled asphalt into cement composite

The Effects of Different Types of Fly Ash on the Compressive Strength Properties of Briquettes

The aim of this study is to evaluate the effect of the different types of fly ash on the compressive strength properties of sintered briquettes. Thermal gravimetric (TG) analysis was carried out. The chemical composition and physical properties of the materials used were determined. Particle size distribution and microstructure elemental analyses of the materials used were carried out by a particle size analyzer (Mastersizer) and a scanning electron microscope (SEM-EDS). Following the characterization of the materials, briquettes were prepared by sintering at different temperatures. Compressive strength test results of the briquette samples indicated that briquettes with a compressive strength value of 47.45 N/mm2 can be produced. The results obtained exceed the Turkish standard (TS EN 771-1) requirements (9.8–23.54 N/mm2). SEM-EDS results showed that briquette samples made with Tunçbilek (T) fly ash had a higher percentage of the glassy phase than the other briquette samples. Due to this microstructure, it results in higher compressive strength value

Evaluation of the mechanical, durability microstructural and mineralogical properties of cement composites treated with waste tire rubber

In this study, waste tire powder groups from the same waste tire material but with different particle sizes are added in cement mixtures that are intended for the production of cement composites as a replacement for certain proportions of the cement content. Four different waste tire group particle size ranges of 0-0.075 mm, 0.075-0.18 mm, 0.18-0.425 mm and 0.425-2 mm are added in cement mixtures by mass of 5%, 10% and 15%. After physical and chemical properties and particle size distributions of the prepared mixtures are determined, mortar specimens of 4x4x16 cm are taken, which are then subjected to compressive strength, weight change, microstructure (SEM-EDS) and mineralogical (XRD) analyses. When the results are evaluated, it is found that compressive strength values of cement mortars including 10% of waste tire powder are higher in thaw freezing-series when compared to the water-curing series. The SEM-EDS and XRD analyses also provided results coherent with compressive strength values. On the other hand, the wetting-drying series are found to be the series with the lowest weight change results.Scientific Research Projects Coordination Unit of Istanbul UniversityIstanbul University [7681]The authors would like to thank to Istanbul Asphalt Factories and especially to the Head of Production, Zafer Sola for supplying the wastes. The set cement factory laboratory staffs are gratefully acknowledged for their assistance with the experimental study. This work was supported by Scientific Research Projects Coordination Unit of Istanbul University, Project number 7681.WOS:0004067280000022-s2.0-8502129279