مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی خواص مکانیکی و ریزساختار بتن خاکی خود متراکم: استفاده در سیستم‌های ساخت و ساز کم کربن

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی عمران، آب و محیط‌زیست، دانشگاه شهید بهشتی، تهران، ایران
2 استادیار، دانشکده مهندسی عمران، آب و محیط‌زیست، دانشگاه شهید بهشتی، تهران، ایران
3 دکتری، دانشکده مهندسی عمران، آب و محیط‌زیست، دانشگاه شهید بهشتی، تهران، ایران
چکیده
امروزه به‌واسطه گرمایش کره زمین و مخاطره‌های زیست محیطی حاصل از آن، استفاده از مصالح کم‌کربن نظیر خاک رس، سیمان‌‌های کم کربن و غیره به ‌دلیل نقش آن‌ها درکاهش تولید گازهای گلخانه‌ای ناشی از صنعت ساخت و ساز اجتناب ناپذیر می‌باشد. در این مطالعه، جهت امکان‌ سنجی استفاده از بتن خاکی در المان‌های سازه‌ای و غیر سازه‌ای (پرکننده)، مطالعه‌ای جامع بر روی خواص مکانیکی، ریزساختاری و تحلیل چرخه عمر طرح‌های پیشنهادی بتن خاکی بر مبنای عملکرد خود‌متراکم صورت پذیرفته است. بدین منظور، ابتدا درصد‌های مختلف 3 نوع خاک رس مختلف با سیمان جایگزین شدند. بر اساس نتایج مقاومت فشاری مخلوط‌های خمیر سیمانی، خاک رس بهینه انتخاب و برای ساخت بتن‌های خاکی خود‌‌متراکم استفاده گردید. در این پژوهش، میزان جایگزینی سیمان بر اساس 50، 60، 70، 80 و 100% خاک رس انجام پذیرفت. بر اساس نتایج خواص مکانیکی، مقاومت فشاری با افزایش خاک رس روند کاهشی داشته، اما این روند با افزایش زمان نگهداری بتن ثابت نبوده است. همچنین نتایج منحنی‌‌های تنش- کرنش نشان داد که نمونه‌های حاوی مقادیر بالای خاک رس دارای کرنش قابل تحمل بیشتر، مدول ارتجاعی و چقرمگی کمتر می‌باشند. بر اساس نتایج آلتراسونیک، مخلوط‌های بتن خاکی خودمتراکم بر اساس کیفیت طبقه بندی شدند و با تحلیل رگرسیون رابطه‌ای برای محاسبه مقاومت فشاری بر اساس نتایج غیر مخرب آلتراسونیک در این نوع بتن ارائه گردید. نتایج آزمایش‌های ریز ساختار بتن نظیر FESEM و ترموتراگیوتمری، متناسب با نتایج مقاومت مکانیکی می‌باشد و کاهش محصولات هیدراتاسیون، افزایش ترک و حفرات به‌واسطه افزایش میزان خاک رس را تأیید می‌نماید. در نهایت تحلیل چرخه عمر نشان می‌دهد استفاده از بتن خاکی می‌تواند میزان تولید CO2 را در طرح‌های سازه‌ای به مقدار 33 % و در طرح-های غیر سازه‌ای (پرکننده) تا 88 % کاهش دهد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigation of the mechanical properties and microstructure of self-compacting earth concretes for use in low-carbon construction systems

نویسندگان English

afshin khodaparast 1
Kianoosh Samimi 2
mahyar pakan 3
1 PhD student, Faculty of Civil, Water and Environment Engineering, Shahid Beheshti University, Tehran, Iran
2 Assistant Professor, Faculty of Civil, Water and Environment Engineering, Shahid Beheshti University, Tehran, Iran
3 Ph.D., Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
چکیده English

Nowadays, because of global warming and its consequences, low-carbon materials such as clay and low-carbon cement are becoming more popular. Hence, they may be able to play a significant role in reducing greenhouse gas emissions. In this study, the fresh state, mechanical properties, microstructure, and life cycle analysis of self-compacting earth concrete were investigated to evaluate its potential utilization in both structural and non-structural components. Three types of clay were substituted with cement as a paste to determine the best type of clay for concrete production. According to earth concrete design mixtures, clay is substituted for cement in amounts of 50%, 60%, 70%, 80% and 100%. It can be concluded from these results that compressive strength decreased as clay content increased. However, this trend did not remain constant throughout the curing process. According to the stress-strain results, earth concretes that contain a high percentage of clay are more tolerable strain and have a lower modulus of elasticity and toughness. Ultrasonic results classified self-compacting earth concrete mixtures according to quality. Following that, based on a regression analysis result, a formula was developed to calculate compressive strength using non-destructive ultrasonic data. Microstructure tests, such as thermogravimetry and FESEM, confirm the mechanical strength results and show that clay content was the main reason for the cracks and holes. Finally, the life cycle analysis indicated that earth concrete decreased CO2 emissions by 33% and 88% in structural and non-structural design mixtures, respectively.

کلیدواژه‌ها English

Greenhouse gases
self-compacting earth concrete
mechanical strength
microstructure
life cycle
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  • تاریخ دریافت 17 بهمن 1402
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