کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8105838 | 1522165 | 2014 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Durability and microstructure characteristics of alkali activated coal bottom ash geopolymer cement
ترجمه فارسی عنوان
ویژگی های رطوبت و ریزساختار سیمان ژئوموپلاستی خاکستر قلیایی فعال
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
Many studies have focused on the production of mortar and concrete without cement. This is referred to as geopolymer mortar or concrete. This paper discusses the effect of alkali oxides (Na2O = 8, 12, 16 wt.% and SiO2 = 0, 4, 8, 12 wt.%) on compressive strength, microstructure and durability of circulating fluidized bed combustion coal bottom ash (CBA) geopolymer cements (GC). Durability and morphology tests were carried out through heating and freezing tests. The highest compressive strength (25.83 MPa) was achieved at Na2O wt.% = 12, SiO2 wt.% = 8. The optimum atomic ratios for a compact microstructure were obtained for Si/Al between 3.5 and 4 and Si/Na close to 0.5. Following the sintering, the main reaction products (N-A-S-H gel) became more amorphous at 800 °C, attaining Si/Al and Si/Na atomic ratios of 4.54 and 0.98. Sodium carbonate formation was observed at 800 °C. Also, the strength loss of GC was only 6.77% after 30 freeze-thaw cycles. The results show that durable geopolymer concrete without cement can be produced by using waste bottom coal ash. Therefore, the production of geopolymer concrete has a high environmental impact, decreasing waste material in addition to global warming.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Cleaner Production - Volume 81, 15 October 2014, Pages 211-217
Journal: Journal of Cleaner Production - Volume 81, 15 October 2014, Pages 211-217
نویسندگان
Ä°lker Bekir Topçu, Mehmet UÄur Toprak, Tayfun UygunoÄlu,