کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4913252 | 1428763 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of nano-SiO2 on the alkali-activated characteristics of spent catalyst metakaolin-based geopolymers
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effects of the nano-SiO2 (NS) addition levels (0.5-2%) and replacement levels of spent catalyst (0-20%) in a geopolymer were analyzed quantitatively. The initial and final setting time of spent catalyst metakaolin-based geopolymers (MKGP) with a 5% spent catalyst substitution at a constant addition of 0.5% NS were 201 and 270Â min, respectively. The compressive strength of these geopolymers after 56Â days of curing age was 71.10Â MPa. Adding 2% NS substantially increased the compressive strength of the samples, and the high energy increases the speed and degree of polymerization. The percentage of mesopores was 84%. The Fourier transform infrared spectra of the geopolymers contained a distinct intensity band at 1300-900Â cmâ1, associated with the Si-O-T asymmetric vibration. The geopolymer with the optimal spent catalyst replacement level and NS addition level contained more structural dener beneficial to structure development. In summary, the application of NS to a geopolymer enhanced its compactness and strength.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 143, 15 July 2017, Pages 455-463
Journal: Construction and Building Materials - Volume 143, 15 July 2017, Pages 455-463
نویسندگان
Kang-Wei Lo, Kae-Long Lin, Ta-Wui Cheng, Yu-Min Chang, Ju-Ying Lan,