بررسی آزمایشگاهی و تحلیل آماری مقاومت‌های طراحی سازه‌ای و ضربه‌ای ملات های ژئوپلیمری الیافی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 دانشگاه سمنان

3 استاد یار گروه عمران دانشکده فنی دانشگاه لرستان

چکیده

با توجه به میزان مصرف بالای ملات و بتن به ویژه در سازه‌ها و نیاز روز افزون به تولید سیمان، توجه به اثرات مخرب زیست محیطی این ماده ضروری به نظر می‌رسد. یکی از راه کارها، تولید مصالح سازگار با محیط زیست و با کاهش اثرات مخرب مرتبط با تولید سیمان پرتلند، همچون ملات و بتن‌های ژئوپلیمری سرباره‌ای می‌باشد. هدف این مقاله بررسی آزمایشگاهی با رویکرد آماری خصوصیات مکانیکی و مقاومتی ملات‌های سیمانی و ژئوپلیمری الیافی است چهار طرح اختلاط شامل سه طرح اختلاط ژئوپلیمری به ترتیب با 0، 5/0 و 1 درصد میکروالیاف فولادی و یک طرح اختلاط ملات معمولی به منظور مقایسه با ملات ژئوپلیمری در نظر گرفته شد. مجموعا 320 نمونه ساخته شد که از هر طرح اختلاط 20 نمونه مکعبی ، 20 نمونه استوانه‌ای، 20 نمونه تیر کوچک، 20 نمونه دیسک کوچک ساخته شد. نتایج آزمایش‌ها نشان داد با افزایش درصد میکروالیاف فولادی تا 1 درصد در نمونه‌های ژئوپلیمری، مقاومت فشاری، کششی و مدول گسیختگی ترتیب تا 6/39، 60/86 و 63/40 % افزایش یافت همچنین تعداد ضربات مقاومت انهدام حدود 25 برابر بیشتر شد. در تمامی آزمایش‌های مقاومت فشاری، کششی، خمشی و ضربه ای نمونه‌های ژئوپلیمری بدون الیاف، مقاومت بهتری نسبت به نمونه‌های ملات معمولی سیمانی داشتند. در تمامی نمونه‌های ژئوپلیمری با افزایش درصد الیاف، انحراف از معیار و ضریب تغییرات و در نتیجه پراکندگی داده‌ها افزایش یافت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental investigation and statistical analysis on structural design and impact strengths of fiber geopolymer mortar

نویسندگان [English]

  • mohammad hossein dalvand 1
  • Mohammad Kazem Sharbatdar 2
  • Ahmad Dalvand 3
1 Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Semnan University
3 Lorestan University
چکیده [English]

Due to the high consumption of mortar and concrete, especially in structures and the increasing demand for cement production, considering the environmental degradation effects of this substance, it seems necessary. One of the solutions is to produce environmentally friendly materials and reduce the damaging effects of Portland cement production, Such as slag geopolymer mortar and concrete. The purpose of this paper is to experimentally investigate the statistical approach of the mechanical and resistive properties of cement mortar and geopolymer fibers mortar. Four mix designs, including three geopolymer mix designs with 0, 0.5, and 1% steel micro-fibers and a conventional mortar mix design, were considered. A total of 320 specimens were made, each consisting of 20 cubic specimens, 20 cylindrical specimens, 20 small beam specimens, and 20 small disc specimens. The results indicated that by increasing the percentage of steel microfibers up to 1% in geopolymer samples, the compressive strength, tensile strength and modulus of rupture increased by 6.39, 60.86, and 63.40%, respectively. The number of destruction resistance blows was also about 25 times higher. In all compressive, tensile, flexural, and impact strengths tests, the non-fiber geopolymer specimens had better behavior than conventional cement mortar specimens. In all geopolymer specimens with increasing fiber percentage, standard deviation and coefficient of variation increased as a result of data dispersion.

کلیدواژه‌ها [English]

  • Mechanical characteristics
  • statistical analysis
  • Geopolymer mortar
  • Micro steel fiber
  • Impact Strength
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