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بررسی رابطه نرخ نفوذ آب و مقاومت سطحی بتن در شرایط حاد یخ و ذوب یخ و بسط یک تئوری جدید | ||
نشریه مهندسی عمران و محیط زیست | ||
مقاله 8، دوره 54، شماره 117، اسفند 1403، صفحه 93-105 اصل مقاله (4.76 M) | ||
نوع مقاله: مقاله کامل پژوهشی | ||
شناسه دیجیتال (DOI): 10.22034/ceej.2025.61955.2360 | ||
نویسندگان | ||
محمود نادری1؛ علی صابری ورزنه* 2؛ سردارولی دین1 | ||
1دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین | ||
2دانشکده فنی و مهندسی، دانشگاه بینالمللی امام خمینی (ره)، قزوین | ||
چکیده | ||
با افزایش سن، مقاومت فشاری بتن افزایش مییابد. تحقیقات آزمایشگاهی نشان داده که با افزایش مقاومت فشاری، نفوذ آب در بتن کاهش مییابد. اما در تئوریهای موجود، برای اندازهگیری نفوذپذیری، تاثیر سن بتن مورد توجه قرار نگرفته است. همچنین در معادله دارسی، نفوذ آب بصورت یک بعدی در نظر گرفته شده اما نفوذ آب به بتن در چند جهت میباشد. مقاومت سطحی بتن نیز میتواند رابطهی نزدیکی با مقدار نفوذپذیری داشته باشد. لذا در این مقاله با بسط یک تئوری، معادله جدیدی ارائه شده که با فاصله گرفتن از مواردی همچون یک بعدی یا دو بعدی بودن انتشار آب، با استفاده از اندازه و توزیع منافذ داخل بتن، مقدار نرخ نفوذ آب به بتن را با دقت بالایی اندازهگیری مینماید. از مزیتهای مدل فوق، تاثیر سن در اندازهگیری نرخ نفوذ آب در بتن است. مقدار نرخ نفوذ آب در بتن نیز با بکارگیری آزمون محفظه استوانهای اندازهگیری شده و نتایج آن با مدل تئوری مقایسه گردیده. با استفاده از آزمون انتقال-اصطکاک نیز مقاومت سطحی نمونهها تعیین و رابطهی آن با مقدار نفوذپذیری بدست آمده است. نمونههای آزمایشگاهی علاوه بر شرایط عادی، تحت شرایط حاد یخ و ذوب یخ قرار گرفته و تاثیر آن بر مقاومت سطحی، نرخ نفوذ و رابطهی آنها مورد بررسی قرار گرفته است. نتایج حاصله بیانگر دقت بالای مدل جدید در اندازهگیری نرخ نفوذ آب میباشد. همچنین ضمن تاثیر منفی شرایط حاد بر مقدار نرخ نفوذ آب، رابطه معکوسی بین نفوذپذیری با مقاومت سطحی بتن در شرایط عادی و حاد وجود دارد. | ||
کلیدواژهها | ||
روش انتقال اصطکاک؛ نرخ نفوذ آب؛ یخ و ذوب یخ؛ مقاومت سطحی؛ مدل تئوری | ||
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آمار تعداد مشاهده مقاله: 60 تعداد دریافت فایل اصل مقاله: 24 |