ارزیابی عملکرد نانوسیلیکات در ارتقای خواص مکانیکی سنگ آهکی به‌کاررفته در معماری میراث جهانی پاسارگاد

نوع مقاله : پژوهشی

نویسندگان

1 دانشگاه هنر اصفهان

2 دانشگاه اصفهان

3 دانشگاه گرانادا اسپانیا

4 ، دانشگاه گرانادا، اسپانیا

5 دانشگاه گرانادا، اسپانیا

چکیده

در این پژوهش به‌لحاظ ارزش والای آثار معماری سنگی ایران و ضرورت حفظ و نگه‌داری آنها برای آیندگان، پژوهشی بر ارتقای خواص مکانیکی سنگ آهکی (سنگ آهک ماسه‌دار) به‌کاررفته در معماری پاسارگاد از طریق استفاده از مادۀ نانوسیلیکات (SiO2) به‌عنوان استحکام‌بخش برای بهبود خواص مکانیکی سنگ و درنتیجه افزایش عمر این نوع سنگ‌‌ها انجام گرفت. در این راستا خواص جذب آب، ضریب نفوذپذیری آب، درصد تخلخل و آزمون‌های پیرسازی تسریعی از طریق استانداردهای اروپایی (UNE-EN) انجام گرفتند؛ علاوه‌بر آن تغییرات سرعت امواج التراسونیک در بافت سنگ‌ها طی آزمون‌های پیرسازی اندازه‌گیری شدند و هم‌چنین تغییرات سختی سطحی توسط دستگاه نیمه‌مخرب Micro-drilling موردارزیابی قرار گرفتند. نانوسیلیکات نرخ جذب آب و خشک شدن را حدوداً 11 درصد و جذب مویرگی آب را تا حدودی کاهش داد، اما ضریب نفوذپذیری آب نسبتاً بدون تغییر باقی ماند. درمقابل، تخلخل سنگ 14 درصد کاهش یافت و مقاومت سطحی آن 20 درصد افزایش پیدا کرد. ارتقای خصوصیات مکانیکی ازطریق افزایش سختی سطحی، افزایش مقاومت دربرابر پیرسازی‌های تسریعی و کاهش تخلخل از نتایج مثبت حاصل نانوسیلیکات در ارتقای خصوصیات مکانیکی و دوام سنگ آهکی پاسارگاد هستند.

کلیدواژه‌ها

عنوان مقاله [English]

Effectiveness Assessment of Nano Silicate Application to Improve Mechanical Properties of a Limestone Used in the Architecture of Pasargadae World Heritage Site

نویسندگان [English]

  • Atefeh Shekofteh 1
  • Hossein Ahmadi 1
  • Mehdi Yazdi 2
  • Anna Arizzi 3
  • Eduardo Molina 4
  • Giuseppe Cultrone 5
1 Art university of Isfahan
2 Isfahan University
3 University of Granada Spain
4 University of Granada Spain
5 University of Granada Spain
چکیده [English]

Abstract   In this study, according to the high value of stone architecture in Iran, an investigation to improve mechanical properties on a type of limestone (Sandy limestone) used in Pasargadae were done by Nano Silicate (SiO2) as a consolidation material. Thus, some mechanical properties such as water absorption, water vapor permeability, porosity and resistance to against aging tests have studied by using UNE-EN standards and Ultrasonic velocity as well as changes in superficial strength by Micro-drilling. Results show the rate of water absorption and water drying decrease about %11 and water capillarity slightly changed. In contrast, water vapor permeability remained almost the same. But, the porosity of stone decreased %14 as well as %20 increasing the superficial resistance. Hence the improving two properties of the stone (porosity and superficial resistance) by applying Nano Silicate are the advantages of this kind of material in order to increase sandy limestone durability used at Pasargadae World Heritage Site.

کلیدواژه‌ها [English]

  • Ultrasonic velocity
  • freez-thaw
  • Salt Crystallization
  • Nano silicate
  • Limestone
  • Pasargadae
  • Mechanical properties
  • Superficial Resistance
  • Consolidation
  • Accelerated aging

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