ارزیابی خصوصیات مکانیکی و دوام بتن با پودر سنگ مرمر کردستان

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشگاه شاهد-تهران-ایران

2 گروه مهندسی عمران، واحد سنندج، دانشگاه آزاد اسلامی، سنندج، ایران

چکیده

پودر سنگ مرمر (MD) یکی از اصلی ترین عناصر مورد استفاده در سرامیک، کاشی و سفال می‌باشد. از این پودر با دانه‌بندی مختلف در بسیاری از صنایع مانند لاستیک، پلاستیک، چرم مصنوعی، مواد شوینده و دارو استفاده می‌شود. طبق مطالعات نویل پرکننده می‌تواند به صورت طبیعی و یا به صورت فرآوری شده وجود داشته باشد. پرکننده‌ها باید ویژگی و نرمی یکنواختی داشته باشند. نباید هنگام استفاده در بتن، میزان آب مصرفی را افزایش دهند، همچنین مقاومت بتن را تحت تاثیر قرار ندهند. در برخی از تحقیقات تاثیر این پودر بر مشخصات بتن مورد توجه بوده است. در این مطالعه، مزایای استفاده از پودر سنگ مرمر بر خصوصیات مکانیکی و دوام بتن به عنوان یک افزودنی معدنی بررسی می‌شود. هدف اصلی این مطالعه، بررسی تأثیر پودر سنگ مرمر تهیه شده از ضایعات معادن سنگ منطقه کردستان (ایران) بر روانی، مقاومت فشاری و دوام بتن در سن 28 روز است. بنابراین 180 نمونه بتنی مکعبی با مقادیر مختلف نسبت آب به سیمان و پودر سنگ مرمر به ماسه ساخته شدند. نتایج آزمایش نشان می‌دهد که افزودن پودر سنگ مرمر به بتن اثرات خوبی بر مقاومت فشاری بتن در مقادیر بالای نسبت آب به سیمان دارد. همچنین با افزودن پودر سنگ مرمر به بتن می‌توان افزایش دوام بتن را پیش بینی کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of mechanical properties and durability of concrete with provided marble dust from Kurdistan

نویسندگان [English]

  • Alireza Habibi 1
  • Aryan Bazrafkan 2
  • Arash Sayari 2
1 Shahed University-Tehran-Iran
2 Department of Civil Engineering, Sanandaj branch, Islamic Azad University, Sanandaj, Iran
چکیده [English]

Marble dust is an industrial by-product that has recently been used as a mineral powder to improve the mechanical properties of concrete. Furthermore, since large amounts of marble dust is available in the waste of stone crushing plants in areas like Kurdistan, employing this powder in the process of making concrete reduces both environmental pollution and the final price of concrete. In this paper, an experimental study was conducted to evaluate the effects of using marble dust as a partial replacement of sand in concrete on slump, 28-day compressive strength, and durability at 28 days. To this end, 180 cubic specimens with 30 mixing designs were tested at the age of 28 days. Studied mixing designs by considering two general groups include three ratios of water to cement (0.4, 0.45, and 0.5) with five ratios of marble dust to sand (0, 0.05, 0.1, 0.15, and 0.2) for each water to cement ratios, and two fineness moduluses of 2.4, and 3 for each groups. The results indicated that partial replacement of sand with marble dust in concrete has different effects on concrete slump. Whereas, it improves compressive strength and decreases permeability of concrete. Moreover, it was found that for each of water to cement ratios, and for both quantities of fineness modulus of sand, increasing marble dust-to-sand ratio from 0 to 20%, increases the compressive strength by 5 to 16% with respect to its respective control specimen. In addition, the results indicated that for each of water to cement ratios, and for both amounts of fineness modulus of sand, increasing the marble dust to sand ratio from 0 to 20%, decreases the depth of water penetration by 55 to 79% with respect to its respective control specimen.

کلیدواژه‌ها [English]

  • Marble dust
  • Mix Design
  • Slump
  • Compressive strength
  • Depth of water penetration

مراجع

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سابقه مقاله

  • تاریخ دریافت: 06 فروردین 1399
  • تاریخ بازنگری: 31 اردیبهشت 1399
  • تاریخ پذیرش: 09 تیر 1399

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