Browsing by Author "Al-Hagri, M.G."

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Citation - WoS: 3
Citation - Scopus: 3
Effect of Single and Hybrid Incorporation of Steel, Polypropylene, and Pet Fibers on the Properties of Concrete Under Static and Impact Loading
(ICE Publishing, 2025) Al-Hagri, M.G.; Döndüren, M.S.
In this paper, the effect of single and hybrid use of steel fibers (STF), polypropylene fibers (PPF), and PET fibers (PETF) on the static and impact properties of concrete was comprehensively evaluated. Concretes were evaluated and compared according to different properties, including static properties (unit weight, compressive strength, flexural strength, splitting tensile strength, fracture energy, and flexural toughness), microstructural properties, impact performance, and cost. In addition, the overall performances of the tested mixtures were comparatively assessed using the desirability function (DF) analysis. The performed tests and analyses showed that while STF had a positive effect on the compressive strength of concrete, PPF and PETF had a negative effect. On the other hand, fibers, especially STF, remarkably increased the splitting tensile strength, flexural strength, flexural toughness, fracture energy, and impact performance of concrete. It was found that under static and impact loads, fibers were successful at shifting the brittle behavior of concrete into a more ductile one. Scanning electron microscopy (SEM) analysis revealed that STF had a better adherence with the surrounding cement paste than PPF and PETF. It was concluded from the DF analysis that concrete containing %1 STF showed the best overall performance among all the tested concrete mixtures. © 2025 ICE Publishing. All rights reserved.
Citation - WoS: 1
Citation - Scopus: 2
Experimental Study on Static and Impact Properties of Concrete Incorporating Nano-Sio2, Nano-Al2o3 and Fe2o3 in Single and Combined Forms
(ICE Publishing, 2023) Al-Hagri, M.G.; Döndüren, M.S.
This paper presents a comparative evaluation of the single and combined effect of nanoparticles on the static and impact properties of concrete. Nano-SiO2, nano-Al2O3 and nano-Fe2O3 were used separately and in combined forms as partial replacements of cement by 1% and 2% by weight. The impact of nanoparticles on the unit weight, compressive strength, split tensile strength, flexural strength, toughness, fracture energy, impact performance of concrete was experimentally examined. In addition, the effect of these nanoparticles on the microstructure of concrete was investigated using SEM analysis. Moreover, to evaluate the commercial production of such concretes, the cost effectiveness of use of nanoparticles in concrete was also discussed. Desirability function analysis was also conducted to compare the overall performance of the tested concretes. The results revealed that use of nano materials in concrete had a positive effect on improving their mechanical performance. Nanoparticles increased the compressive strength, split tensile strength, flexural strength, and energy absorption capacity of concrete. Use of nanoparticles didn't show any significant influence on the unit weight of concrete. Moreover, the results also showed that nano materials didn't have a good influence on the impact performance of concrete. SEM analysis showed that use of nanoparticles improved the microstructure of concrete. © 2023 Emerald Publishing Limited: All rights reserved.
Citation - Scopus: 24
A Review of the Effect and Optimization of Use of Nano-Tio2 in Cementitious Composites
(MIM RESEARCH GROUP, 2022) Döndüren, M. S.; Al-Hagri, M.G.
There are some problems and weaknesses related to cement-based materials, such as their very low tensile strength, low chemical resistance and the huge contribution of cement production to industrial CO2 emissions. One possible method to reduce the impacts of such problems is the partial replacement of cement in cementitious materials with nano materials. This work provides a detailed review of incorporation of one of the most widely used nano materials, namely nano-titanium dioxide, and its effect on the properties of cementitious composites. Different properties have been considered in the current study, such as fresh properties, mechanical properties (compressive strength, split tensile strength and flexural strength), durability (permeability, ultrasonic pulse velocity (UPV), electrical resistivity, carbonation resistance, freeze and thaw resistance and sulfate attack resistance) and microstructural properties. This paper also investigates the optimum content of nano-TiO2 in cement-based materials. Moreover, the cost effectiveness of use on nano-titania in cementitious composites has been discussed. Nano titania reduces the workability and setting time of cement-based materials. It can be very effective in improving the mechanical properties, durability and microstructural properties of cementitious composites. © 2022 MIM Research Group.