Sürdürülebilir Kalkınma Amaçları
Yazarlar
Yayınlar
- MakaleYalnız künye2026Scopus SJRQ1High-temperature, freeze–thaw, and sulfate resistance of mortars incorporating ternary blends of fly ash, chromite, and waste glass
Gülmez, Nihan; Kanellopoulos, Antonios
The demand for sustainable construction materials promotes the use of industrial waste in cement-based systems. This study examines mortars incorporating fly ash (FA) (0%, 7.5%, and 15%), waste glass, and chromite aggregates for mechanical and durability performance. Specimens underwent compressive strength, freeze–thaw, high-temperature, sulfate attack, and ultrasonic pulse velocity tests, while microstructure was characterized by x-ray diffraction, thermogravimetric analysis, and scanning electron microscopy–energy-dispersive spectroscopy. Mortars with 7.5% FA exhibited relatively high compressive strength and improved freeze–thaw resistance. The combined use of chromite and FA improved strength retention at 800°C, reaching 23 MPa with 7.5% FA and 50% chromite. The greatest sulfate resistance occurred in mortars containing 15% FA and 15% waste glass, maintaining compressive strengths of 61 and 70.9 MPa after MgSO4 and Na2SO4 exposure, respectively.
- MakaleYalnız künye2025Scopus SJRQ1Mechanical, durability and microstructure properties of eco-friendly self-compacting mortars with addition of volcanic scoria, silica fume and boron waste as cement replacement
Şahin Yön, Merve
The objective of this experimental study is to investigate the mechanical and durability performances of self-compacting mortars containing industrial waste and natural stone to develop an environmentally friendly mortar. Binary series of boron waste (B), silica fume (S) and volcanic scoria (V) were formed by substituting up to 95 % by weight with Portland cement, and ternary series were formed by substituting up to 80 % by weight with Portland cement. A total of 14 mixtures and one reference mixture (R) were improved for the purpose of investigating the workability, mechanical strength and durability properties of self-compacting mortar with different binder compositions. Samples of 40x40x160 mm were produced to evaluate mechanical properties and freeze-thaw effect, 100x100x100 mm for abrasion testing and 50x50x50 mm to determine physical properties. Additionally, SEM/EDS and XRD analyses were performed to determine the microstructural characteristics of the mixtures formed. The test results demonstrated that the sole replacement of boron waste with Portland cement resulted in enhanced fluidity. Nonetheless, the 90-day compressive strengths of the S10V20 and B5S10V5 mixtures exhibited increases of 7.47 % and 5.57 %, respectively, relative to the reference, whilst the B15 series saw a 52.5 % reduction, marking the lowest 90-day compressive strength compared to the reference sample. When the freeze-thaw effect was assessed after 136 cycles, the compressive strength diminished by 8.57 %, 13.1 %, 4.13 %, 7.28 %, 6.22 %, 24.77 %, and 48.1 % in the R, B5, V5, V10, V15, B5S10V5, B5S10V10, and B5S10V15 samples, respectively. Among the samples subjected to abrasion tests, a loss of 6.5 per thousand occurred in the mass of the reference sample at the end of 6 minutes, while a loss of 11 per thousand occurred in the binary mixture containing 5 % B, which had the highest abrasion.
AtıfScopus16WoS14OpenAlex16
İncele - Yüksek Lisans TeziAçık Erişim2022Çimento fabrikası etrafında yetişen bitkilerde bazı stratejik hammaddelerin belirlenmesi
Harun Harmanşah
Bu tez çalışmasının ana amacı, çimento fabrikası etrafında yetişen bazı bitki türlerinde bazı stratejik hammaddelerin konsantrasyonlarının belirlenmesidir. Bu amaçla, çimento fabrikası etrafında yetişen badem, buğday, dut, nar, çam ve üzüm bitkileri hasatlandı ve stratejik hammaddelerden kobalt (Co), stronsiyum (Sr), antimon (Sb), fosfor (P), lantan (La) ve magnezyum (Mg) konsantrasyonları tespit edildi. Elde edilen verilere göre yaprak kısmında en yüksek kobalt konsantrasyonu çam bitkisinde 0,43 mg/kg olarak, en yüksek stronsiyum konsantrasyonu üzüm bitkisinde 209,4 mg/kg olarak, en yüksek antimon konsantrasyonu çam bitkisinde 0,09 mg/kg olarak, en yüksek fosfor konsantrasyonu buğday bitkisinde 2990 mg/kg olarak, en yüksek lantan konsantrasyonu çam bitkisinde 0,31 mg/kg olarak ve en yüksek magnezyum konsantrasyonu dut bitkisinde 4790 mg/kg olarak belirlendi. Yaprak kısmında tespit edilen kobalt konsantrasyonları Çam > Badem > Üzüm > Dut > Buğday > Nar şeklinde; stronsiyum konsantrasyonları Üzüm > Dut > Çam > Badem > Nar > Buğday şeklinde; antimon konsantrasyonları Çam > Üzüm > Buğday = Nar = Badem = Dut şeklinde; fosfor konsantrasyonları Buğday > Dut > Badem > Üzüm > Nar > Çam şeklinde; lantan konsantrasyonları Çam > Üzüm > Badem > Dut > Buğday > Nar şeklinde ve magnezyum konsantrasyonları Dut > Badem > Üzüm > Nar > Çam > Buğday şeklinde sıralandı.