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

مهندسی عمران فردوسی

مقاله 3، دوره 31، شماره 4 - شماره پیاپی 24، آبان 1397، صفحه 41-62   

نوع مقاله: پژوهشی

شناسه دیجیتال (DOI): 10.22067/civil.v31i4.62937

نویسندگان

عاطفه شکفته^{* 1}؛ حسین احمدی¹؛ مهدی یزدی²؛ آنا اریتزی³؛ ادواردو مولینا⁴؛ جوزپه کلترونه⁵

¹دانشگاه هنر اصفهان

²دانشگاه اصفهان

³دانشگاه گرانادا اسپانیا

⁴، دانشگاه گرانادا، اسپانیا

⁵دانشگاه 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

نانو سیلیکات؛ سنگ آهک؛ پاسارگاد؛ خواص مکانیکی؛ مقاومت سطحی؛ استحکام بخشی؛ پیرسازی تسریعی؛ التراسونیک؛ یخبرشدن؛ تبلور نمک

سایر فایل های مرتبط با مقاله

3-shkofteh.pdf

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