Tortum, Ahmet; Sünbül, Şeyma

Nowadays, durability and longevity represent the main issues in the field of road concrete. Roller Compacted Concrete (RCC) is a sustainable option for road pavements due to its low binder content, fast application and high strength. Nevertheless, there is a necessity for the improvement of RCC road concretes through the incorporation of various additives to enhance their performance. The present study investigates the mechanical and microstructural properties of RCC road concretes containing Fe₂O₃ and TiO₂ nano powders and basalt fiber additives. Three distinct mixtures were formulated, and a series of compressive strength, flexural strength and abrasion resistance tests were conducted. The results were verified by BET (Brunauer-Emmett-Teller) and SEM (Scanning Electron Microscope) analyses. The experimental findings demonstrated that the incorporation of nano powder and basalt fiber additives was effective in increasing the durability of concrete. The third mixture demonstrated optimal performance, exhibiting a compressive strength of 61.20 MPa, a flexural strength of 8.80 MPa, and a mass loss of 2.5 g. BET analysis revealed that the incorporation of nanopowders enhanced the matrix density by increasing the surface area. Furthermore, the SEM images demonstrated that the nanopowders were uniformly dispersed within the matrix, and the basalt fibres exhibited robust interfacial interactions. In conclusion, the combined use of Fe2O3 and TiO2 nanopowders with basalt fibre additive is considered as an effective approach to improve the performance of RCC road concretes.

Özdın, Tufan; Memişoğullarından, Esra

This paper examines the transfer of n­UJ-rings between A and B in an amalgamated duplication of a ring A along some ideal K of a ring B with a ring homomorphism f:A→B (denoted by A⋈^f K).

Acar, Selim; Karaduman Er, Irmak; Yildirim, Memet Ali; Soltabayev, Baktiyar; Ateş, Aytunç

Undoped ZnO and Ni-doped ZnO thin films were synthesized on glass substrate using theSILAR method. The aim of this work is the analysis of NO gases using Zn1-xNixO sensorsconcentrations in the range from 100 ppb to 25 ppm. The gas sensing properties of the films forlow NO gas concentrations were carefully investigated within a temperature range from 35 to135ºC. The gas measurement results revealed that the doping process was strongly affected bythe response of Ni-doped ZnO thin films. The Zn0.75Ni0.25O sensor exhibited higher sensitivity,faster response, and recovery times for NO gas at low (100 ppb) concentration. It was concludedthat the Ni dopant enhanced the properties of ZnO films for gas sensor applications by changingthe microstructure, morphology, and bandgap of ZnO material.