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اثر ریزساختار فیزیکی منافذ بر مقاومت فشاری و جذب آب در بتنهای خودتراکم حاوی میکروسیلیس و متاکائولین | ||
تحقیقات بتن | ||
مقاله 1، دوره 14، شماره 1 - شماره پیاپی 33، فروردین 1400، صفحه 5-19 اصل مقاله (886.55 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jcr.2021.17493.1453 | ||
نویسندگان | ||
پرویز قدوسی1؛ لیلا عادل زاده سعدآبادی* 2 | ||
1دانشگاه علم و صنعت ایران | ||
2دانشکده مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران | ||
چکیده | ||
شناخت ریزساختار فیزیکی از جمله توزیع اندازه منافذ و نفوذپذیری بتن در مقابل آب به دلیل اثر آن بر دوام بلند مدت، حائز اهمیت است. هدف تحقیق حاضر بررسی اثر ریزساختار فیزیکی منافذ در بتنهای خودتراکم حاوی متاکائولین و میکروسیلیس بر درصد جذب آب و جذب مویینه آب و مقاومت فشاری است. بتنهای خودتراکم با مقدار مواد سیمانی kg/m3450 و نسبت آب به سیمان 35/0، 45/0 و 55/0 طراحی شدند. ترکیبهای دوتایی و سه تایی سیمان، میکروسیلیس و متاکائولین برای این تحقیق ساخته شد. به منظور بررسی تفاوت اثر متاکائولین و میکروسیلیس بر ریزساختار فیزیکی، مخلوطهای حاوی متاکائولین و جایگزینی میکروسیلیس و متاکائولین با نسبت آب به سیمان 0.45 ساخته شد. مشخصات ریزساختار فیزیکی شامل اندازه میانه منافذ، حجم منافذ بزرگ و کوچک مویینه در بتنهای خودتراکم پوزولانی توسط آزمایش تخلخلسنجی جیوهای اندازه گیری شد. آزمایشهای مقاومت فشاری، جذب حجمی و مویینه آب بر روی نمونههای بتن خودتراکم انجام شد. نتایج نشان داد که عامل موثر مهم بر مقاومت فشاری و نفوذپذیری در برابر آب، اندازه میانه منافذ و حجم منافذ بزرگ مویینه است. بتن حاوی 20 درصد متاکائولین و 8 درصد میکروسیلیس علیرغم داشتن بیشترین مقاومت فشاری 77 مگاپاسکال، کمترین تخلخل را نداشت. کمترین تخلخل با مقدار 6/8 درصد، متعلق به بتن خودتراکم حاوی میکروسیلیس و نسبت آب به سیمان 35/0 است. | ||
کلیدواژهها | ||
ریزساختار فیزیکی منافذ؛ بتن خودتراکم؛ متاکائولین؛ میکروسیلیس؛ جذب آب | ||
مراجع | ||
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