کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
6713844 1428734 2018 9 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Performance of copper slag contained mortars after exposure to elevated temperatures
ترجمه فارسی عنوان
عملکرد ذرات مس پس از قرار گرفتن در معرض دمای بالا، ملات را شامل می شود
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
Performance of copper slag contained mortars after exposure to elevated temperatures is studied in this paper. Portland cement (PC) based mortar with copper slag replacements of 0, 5%, 10% and 15%, as well as NaOH activated copper slag mortar with NaOH concentrations of 6 M, 8 M, 10 M and 12 M were manufactured. Compressive strength and flexural strength of the mortar specimens were tested at room temperature and after exposure to 200 °C, 400 °C, 600 °C, 800 °C, 1000 °C and 1200 °C, respectively. Paste specimens were further prepared to measure their chemical and physical changes with temperature by using X-ray diffraction (XRD), thermal gravity (TG)/differential scanning calorimeter (DSC) and scanning electron microscopy (SEM)/SEM-energy dispersive spectrometer (EDS) techniques. The results show that the strength of PC mortars containing copper slag increased within 200 °C, but after that their strength declined continuously. While the strength of alkali activated copper slag mortars increased dramatically both within 200 °C and after 800 °C. Amorphous Fe(OH)3/Fe(OH)2 gels could be formed in the hydration products of PC containing copper slag at room temperature and of alkali activated copper slag at a higher temperature. For alkali activated copper slag, after 600 °C, Fe2O3 was formed as a result of the oxidation of Fe2SiO4 and/or the decomposition of Fe(OH)3/Fe(OH)2. With the further increase of temperature, Fe2O3 could have melted in a Na-rich environment. The melted matters could sufficiently flow through the pores and cracks in the matrix. When the matters cooled down, they could fill in the pores and cracks and then make the matrix much dense to provide high strength.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 172, 30 May 2018, Pages 378-386
نویسندگان
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