مطالعه آزمایشگاهی اثر ریزدانه و درصد الیاف بر رفتار و ظرفیت ترک خوردگی مواد مرکب سیمانی مهندسی شده (ECC)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران ،دانشکده مهندسی، دانشگاه فردوسی مشهد ،مشهد

2 مهندسی عمران، دانشکده فنی، دانشگاه فردوسی مشهد، مشهد، ایران

10.22124/jcr.2023.22591.1588

چکیده

در این پژوهش آزمایشگاهی اثر استفاده از الیاف پلی پروپیلن (PP)، غبار کوره ذوب آهن، سرباره آهن مذاب، پودر سنگ معدنی، ماسه شسته طبیعی و میکروسیلیس بجای الیاف پلی وینیل الکل (PVA)، خاکستربادی و ماسه سلیس برای بهبود خواص مکانیکی و شکل‌پذیری مواد مرکب سیمانی مهندسی (ECC) مورد بررسی قرار گرفت. برای این منظور 12 طرح اختلاط متفاوت بررسی شد. سپس نمونه های فشاری و خمشی برای مخلوط ها ساخته و آزمایش شدند. مشاهده شد که استفاده همزمان از میکروسیلیس و غبار کوره ذوب‌آهن با ایجاد شکل‌پذیری و افزایش مقاومت ماده مرکب می‌تواند جایگزین مناسبی برای خاکستر بادی باشد. پودر سنگ معدنی در یک ترکیب مناسب می‌تواند جایگزین ماسه سیلیس در ترکیب ECC شود. در نسبت سیمان به مواد سیمانی برابر 1/25 بهترین عملکرد برای ECC بدست آمد. با افزایش درصد الیاف از 1 به 1/5 مقدار مقاومت خمشی 65 درصد و خیز وسط دهانه 21/7 درصد افزایش یافت و درصد بهینه الیاف PP برای شروع رفتار سخت‌شوندگی مقدار 1/5 درصد بدست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation of the effects of aggregate and fiber percentage on the behavior and cracking potential of Engineered Cementitious Composites

نویسندگان [English]

  • Mohammad Reza Esfahani 1
  • Mohammad Amiri 2
1 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)
2 Ferdowsi university of Mashhad
چکیده [English]

The aim of this study is to determine the effect of replacing polyvinyl alcohol (PVA) fibers, fly ash (FA), and silica aggregate with polypropylene (PP) fibers, ground blast furnace slag (GBFS), iron furnace dust, limestone powder (LSP), natural sand, and microsilica to improve the mechanical properties and ductility of Engineered Cementitious Composites (ECC). Twelve different mixtures of ECC were designed and prepared. For each mixture, flexural and compression specimens were made and tested. The combination of microsilica and GBFS increases the strength and ductility of the composite, making it a viable alternative to fly ash. Replacement of silica sand with LSP that contains the appropriate composition can enhance ECC. The best results were achieved in ECC when the cementitious materials ratio was 1.25. By increasing the percentage of PP fibers from 1 to 1.5, the flexural strength increased by 65 percent, the middle span deflection of the flexural specimen increased by 21.7 percent, and the optimal amount of PP fibers to initiate hardening was 1.5 percent.

کلیدواژه‌ها [English]

  • Engineered Cementitious Composite
  • limestone powder
  • Ground Blast Furnace Slag
  • polypropylene fibers
  • microsilica

مراجع

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