تاثیر سرباره آهن و الیاف پلی‌پروپیلن بر مشخصات مقاومتی و ضربه ملات ژئوپلیمری پایه خاک رس زئولیتی فعال شده با مواد قلیایی سدیمی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه سمنان

2 استاد، دانشکده مهندسی عمران، دانشگاه سمنان

3 ستاد، دانشکده مهندسی عمران، دانشگاه سمنان

چکیده

امروزه با درک اثرات مخرب سیمان و ایجاد آلاینده‌گی محیط زیست، دانشمندان در صدد دریافت روش‌های مختلف به منظور جایگزینی سیمان، توام سازگار با محیط زیست می‌باشند. یکی از این روش‌ها، استفاده از مواد پایه خاک حاوی الومینوم سیلیکاتی با فعال کننده‌های قلیایی و ضایعات صنعتی می‌باشد. هدف اصلی این تحقیق بررسی مشخصات مقاومتی و دوام ملات ژئوپلیمر و مقایسه آن با ملات پایه سیمانی و گلی خاک رس بود. برای این هدف هشت طرح اختلاط ملات مدنظر گرفته شد. دو طرح آن به ملات‌های پایه سیمانی و گلی به منظور مقایسه و شش طرح آن به ملات ژئوپلیمری اختصاص داده شد. ملات ژئوپلیمری با 0، 30 و 40 درصد سرباره که در سه طرح آن 1/0 درصد الیاف پلی‌پروپلین به‌صورت حجمی استفاده گردیده مدنظر گرفته شد. غلظت محلول هیدروکسید‌سدیم 12 مولار و نسبت سیلیکات سدیم بر هیدروکسید‌سدیم 5/2 بودند. نمونه ها از نظر مقاومت فشاری و کششی در سنین 7، 28، 54 و 90 روز آزمایش شدند و پس از 28 روز نیز آزمون جذب آب، جذب آب موئینگی و مقاومت در برابر ضربه انجام شد. نتایج آزمون مقاومت فشاری 28 روزه نشان داد که نمونه‌های ژئوپلیمری حاوی 30 و 40 % سرباره با الیاف پلی‌پروپیلن به ترتیب 53 و 73% مقاومت نمونه سیمانی و 6/3 و 9 برابر نسبت به نمونه‌ پایه رسی بیشتر شدند و مقاومت کششی نمونه‌های موردنظر 53 و 63 % مقاومت نمونه سیمانی را کسب کردند و نسبت به نمونه پایه رسی 5 و 5/9 برابر بیشتر شدند. نتایج نشان داد که استفاده از الیاف پلی‌پروپیلن در نمونه‌های ژئوپلیمری حاوی 30 و 40% سرباره باعث کاهش جذب آب گردید ولی در مقایسه با نمونه سیمانی، پس از ۷۲ ساعت ۹۵ و ۷۲ % آب بیشتری جذب کردند. ضریب جذب موئینگی در تمامی نمونه‌های ژئوپلیمری رقم بالایی را نشان داد اما استفاده از الیاف در نمونه حاوی 40 % سرباره باعث کاهش 1 % این ضریب نسبت به نمونه غیرالیافی آن گردید. نتایج مقاومت ترک خوردگی نمونه‌های ژئوپلیمری در آزمایش ضربه نشان داد که نمونه‌های حاوی 30 و 40 % سرباره با الیاف به ترتیب 40 و 73 % مقاومت ترک خوردگی نمونه سیماتی را کسب کردند. مقاومت انهدام نمونه حاوی 30 % سرباره با الیاف حدود 46 % مقاومت سیمانی را به‌دست آورد اما مقاومت انهدام نمونه حاوی 40 % سرباره با الیاف، 15 % بیشتر از نمونه سیمانی شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Iron Slag and Polypropylene Fibers on the Strength and Impact Characteristics of Geopolymer Mortar based on Zeolite Clay Activated with Sodium Alkali Substances

نویسندگان [English]

  • Mohammad Arif koshyar 1
  • omid rezaifar 2
  • Mohammad Kazem Sharbatdar 3
1 PhD Candidate, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran.
چکیده [English]

In light of the adverse ecological outcomes of cement production, researchers are exploring alternative materials that can replace cement in construction while maintaining environmental compatibility. An alternative strategy is the use of soil base materials containing aluminum silicate with alkaline activators and industrial waste. This study aims to evaluate the strength and durability properties of geopolymer mortar relative to cement and clay-based mortars. Eight mixing designs were employed, including two for cement and clay-based mortars for comparison, and six for geopolymer mortars. The geopolymer mortars tested comprised 0%, 30%, and 40% slag, with 0.1% polypropylene fibers used in three designs. A 12 M concentration of sodium hydroxide solution and a sodium silicate to sodium hydroxide ratio of 2.5 were utilized in this study. The samples were subjected to compressive and tensile strength evaluations at 7, 28, 54, and 90-day intervals. Additionally, water absorption, capillary water absorption, and impact resistance tests were performed after 28 days. The compressive strength test conducted after 28 days revealed that geopolymer mortars that contained either 30% or 40% slag, along with polypropylene fibers, achieved 53% and 73% of the compressive strength of the cement sample, respectively. This increase represented a 3.6 to 9-fold improvement over clay-based samples. The tensile strength of the geopolymer samples was found to be 53% and 63% of the strength of the cement, but 5 and 9.5 times higher than the clay-based sample, respectively. The results showed that the use of polypropylene fibers in geopolymer samples containing 30 and 40% slag reduced water absorption, but compared to cement samples, they absorbed 95 and 72% more water after 72 hours. The coefficient of capillary absorption in all geopolymer samples was high, but the use of fibers in the sample containing 40% slag resulted in a 1% reduction in this coefficient compared to the non-fiber sample. Cracking resistance tests were conducted on the geopolymer samples, which showed that the samples containing 30 and 40% slag with fibers achieved 40 and 73% of the cracking resistance of the cement sample, respectively. The destruction resistance of the sample containing 30% slag with fibers was approximately 46% of the cement resistance, while the model containing 40% slag with fibers exhibited a 15% improvement relative to the cement sample.

کلیدواژه‌ها [English]

  • Geopolymer
  • Clinoptilolite soil
  • Slag
  • Alkaline Activators
  • Compressive and Tensile Strength
  • Water Absorption
  • Impact Resistance
  • Polypropylene Fibers

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سابقه مقاله

  • تاریخ دریافت: 10 اسفند 1401
  • تاریخ بازنگری: 25 خرداد 1402
  • تاریخ پذیرش: 28 تیر 1402

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