کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5436855 1509653 2017 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flexural behavior of geopolymer composites reinforced with steel and polypropylene macro fibers
ترجمه فارسی عنوان
رفتار انعطاف پذیر کامپوزیت های ژئوپلیمر تقویت شده با فیبرهای فولادی و پلی پروپیلن
کلمات کلیدی
کامپوزیت ژئوپلیمر تقویت شده از خاکستر الیاف پرواز، فیبر ماکرو، غلظت محلول قلیایی، پخت، رفتار انعطاف پذیر،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
Like ordinary Portland cement concrete, the matrix brittleness in geopolymer composites can be reduced by introducing appropriate fiber reinforcement. Several studies on fiber reinforced geopolymer composites are available, however there is still a gap to understand and optimize their performance. This paper presents the flexural behavior of fly ash-based geopolymer composites reinforced with different types of macro steel and polypropylene fibers with higher aspect ratio. Three types (length-deformed, end-deformed and straight) of steel fibers and another type of length-deformed polypropylene fiber with optimum fiber volume fraction of 0.5% are studied. The effects of different geometries of the fibers, curing regimes (ambient cured and heat cured at 60 °C for 24 h) and concentration of NaOH activator (10 M and 12 M) on the first peak strength, modulus of rupture and toughness of the geopolymer composites are investigated. The quantitative effect of fiber geometry on geopolymer composite performance was also analyzed through a fiber deformation ratio. The compressive strength, splitting tensile strength and flexural toughness are significantly improved with macro fibers reinforcement and heat curing. The results also show that heat curing increases the first peak load of all fiber-reinforced geopolymers composites. End-deformed steel fibers exhibit the most ductile flexural response compared to other steel fibers in both heat and ambient-cured fiber reinforced geopolymer composites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 80, July 2017, Pages 31-40
نویسندگان
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