بررسی خواص بتن حاوی سنگدانه‌های بازیافتی و لاستیک ضایعاتی به همراه میکروسیلیس

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی و مهندسی، دانشگاه رازی، کرمانشاه، ایران .

چکیده

     هدف اصلی در این تحقیق، بررسی آزمایشگاهی خواص مکانیکی بتن حاوی سنگدانه ­های بازیافتی بتنی و لاستیک ضایعاتی به همراه میکروسیلیس می­ باشد. بدین منظور سنگدانه­ های بازیافتی بتنی به میزان 0، 25، 50 و 100 درصد وزنی جایگزین درشت دانه و میکروسیلیس به میزان 10 درصد وزنی سیمان، جایگزین سیمان شده است. همچنین در دو نمونه آزمایشگاهی دارای 50 درصد سنگدانه بازیافتی بتنی، یکی در حالت بدون میکروسیلیس و دیگری با میکروسیلیس از لاستیک ضایعاتی به میزان 30 درصد حجمی ماسه جایگزین سنگ دانه ریز، استفاده شده است. در گام بعدی مقدار اسلامپ، مقاومت فشاری، مقاومت کششی، مقاومت خمشی، نمودار تنش-کرنش، چگالی و نفوذپذیری نمونه ­ها مورد ارزیابی قرار گرفته است. نتایج این پژوهش نشان می­دهد که وجود سنگدانه­ های بازیافتی سبب کاهش 3/2 تا14/5 درصدی مقاومت فشاری و همچنین افزودن پودر لاستیک به نمونه دارای 50 درصد سنگدانه بازیافتی، سبب کاهش 71 درصدی مقاومت فشاری نسبت به نمونه مرجع (نمونه با سنگدانه‌های طبیعی بدون میکروسیلیس) شده است. همه­ ی نمونه­ های دارای میکروسیلیس نسبت به نمونه ­های مشابه بدون میکروسیلیس، مقاومت فشاری بیشتری دارند. بیشترین مقاومت فشاری مربوط به نمونه­ی دارای 25 درصد سنگدانه بازیافتی و میکروسیلیس است که نسبت به نمونه مرجع 9/6 درصد بیشتر است. نمونه حاوی 50 درصد سنگدانه بازیافتی در حضور و در غیاب پودر لاستیک به ترتیب 55 و 72 درصد، مقاومت کششی کمتری و به ترتیب 30 و 67 درصد مقاومت خمشی کمتری نسبت به نمونه مرجع دارند. کمترین جذب آب، برای نمونه بدون سنگدانه­ های بازیافتی دارای میکروسیلیس و به میزان 0/5 درصد است.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of Properties of Concrete Containing Recycled Aggregates and Waste Rubber with Micro Silica

نویسندگان [English]

  • Hosain Shorbi Niazi
  • Ebrahim Khalilzadeh Vahidi
Department of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
چکیده [English]

The main purpose of this study is to experimental investigation the properties of concrete containing recycled concrete aggregates and waste rubber with micro silica. For this purpose, recycled concrete aggregates in the amount of 0%, 25%, 50% and 100% by weight have replaced with coarse aggregate and micro-silica at the amount of 10% by weight have replaced with cement. Also, in two specimens with 50% recycled concrete aggregate, first without micro silica and second with micro silica, waste rubber with 30% by volume of fine aggregate has been replaced and used. In the next step, the amount of slump, compressive strength, tensile strength, flexural strength, stress-strain curve, density and permeability of the specimens are evaluated. The results of this study show that the presence of recycled aggregates reduces the compressive strength from 3.2% to 14.5% and also adding waste rubber powder to the specimen with 50% recycled aggregates reduces the compressive strength to the 71% compared to the reference specimen (specimen with natural aggregates and without micro-silica). All specimens with micro silica have higher compressive strength than similar specimens without micro silica. The highest compressive strength is related to the specimen with 25% recycled aggregate and micro silica, which is 9.6% higher than the reference specimen. Specimens containing 50% recycled aggregate in the presence and absence of waste rubber powder have 55 and 72% lower tensile strength and 30 and 67% lower flexural strength, respectively, than the reference specimen. The lowest water absorption is for the specimen without recycled aggregates with micro silica at the amount of 0.5%.

کلیدواژه‌ها [English]

  • Properties
  • Recycled concrete aggregates
  • Waste rubber
  • Micro-silica
  • Water absorption

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 3
خرداد 1401
صفحه 1151-1164

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