Microstructural alteration of alkali activated slag mortars depend on exposed high temperature level

Autor: Hakan Turker, Muzeyyen Balcikanli, Erdogan Ozbay, İbrahim Halil Durmuş, Mustafa Erdemir
Přispěvatelé: Mühendislik ve Doğa Bilimleri Fakültesi -- İnşaat Mühendisliği Bölümü, Türker, Hakan Tacettin, Balçıkanlı, Müzeyyen, Özbay, Erdoğan
Rok vydání: 2016
Předmět:
Fly-ash
Performance
Cement
0211 other engineering and technologies
Geopolymers | Coal Ash | Slag Cement
Alkali activated slags
Sodium silicate
02 engineering and technology
High temperature resistance
Pastes
law.invention
Microstructural alterations
chemistry.chemical_compound
Engineering
law
021105 building & construction
Silicon compounds
Curing
General Materials Science
Composite material
Microstructure
Curing (chemistry)
Elevated temperature
Multidisciplinary
Temperature control
Civil
Thermogravimetric analysis
021001 nanoscience & nanotechnology
Geopolymer concrete
Bending tests
Sodium hydroxide
Cements
Construction & Building Technology
Slags
0210 nano-technology
Scanning electron microscopy
Metakaolin
Workability
Portland cement
Materials science
X ray diffraction
Materials Science
Elevated-temperature
Compressive strength
Atomic absorption spectrometry
Microstructural variation
Ordinary Portland cement mortars
Civil and Structural Engineering
Slag cement
Behavior
Silicates
Sodium
Alkali activated slag
Building and Construction
Compression testing
High temperature
Mortar
chemistry
Zdroj: Construction and Building Materials. 104:169-180
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2015.12.070
Popis: WOS: 000368956500020
This article reports a study on the microstructural and mechanical properties of the Alkali Activated Slag mortars (MS) upon exposing to the elevated temperatures up to 800 degrees C. Slag cement is activated by sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions with silicate modulus (Ms = SiO2/Na2O) of 1.0 and sodium (Na) dosages of 5%. MS mortars were being subjected to the ambient and high temperature curing (6 h under 60 degrees C) after undisturbed for 24 h in mold at room temperature. Ordinary Portland cement (OPC) mortar was also prepared as control. Bending and compression tests were conducted at ambient temperature and after exposure to high temperatures at 28 days. Both AAS and OPC mortars were subjected to the X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TGA) tests to find out the microstructural variation due to the exposed temperature level. Test results revealed that the high temperature resistance of the alkali activated slag mortars and Portland cement mortars are clearly different from each other's. Contrary to the expectations, brilliant mechanical and high temperature resistance might not be observed at the alkali activated slag mortars irrespective of the applied cured conditions. Additionally, applied curing regime and exposed temperature level had a significant effect on the TGA, XRD and SEM images. (C) 2015 Elsevier Ltd. All rights reserved.
Databáze: OpenAIRE
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