مهندسی سازه و ساخت

مهندسی سازه و ساخت

بکارگیری آزمون‌های ابداعی پیچش و محفظه استوانه‌ای و بسط مدل جدید تئوری جهت اندازه‌گیری نرخ نفوذ آب در بتن

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دکترای سازه، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران.
2 استاد، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران.
3 دانشجوی دکترای سازه، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی(ره)، قزوین، ایران.
چکیده
مشخصات مکانیکی و پایایی بتن بصورت مستقیم با ویژگی‌های ساختاری منافذ میکروسکوپی بتن در ارتباط است. با توجه به اینکه در هندسه اقلیدسی، تمامی ابعاد بصورت اعداد صحیح می‌باشند لذا نمی‌توان ساختار منافذ میکروسکوپی را توسط آن تعریف نمود. لذا در این مقاله با گذر از محدودیت‌هایی مانند یک بعدی و دو بعدی و... اقدام به ارائه تئوری جدیدی شده که مشخصات واقعی سیستم‌های پیچیده را بیان می‌نماید. بعد طول پیچیدگی و مساحت سطحی منافذ از مشخصات مهم مدل مذکور می‌باشد. همچنین با بررسی استانداردهای معتبر جهانی، ملاحظه می‌گردد که برای اندازه‌گیری نفوذپذیری بتن نیاز به دستگاه‌های آزمایشگاهی بوده و نمی‌توان در محل پروژه و بصورت درجا اقدام به ارزیابی نفوذپذیری نمود. به همین جهت نیاز به معرفی و بکارگیری آزمون‌های نوین و درجا برای اندازه‌گیری نفوذپذیری و مقاومت بتن مورد نیاز می‌باشد. در این مقاله برای اندازه‌گیری نرخ نفوذ آب به بتن و همچنین مقاومت سطحی بتن از آزمون‌های ابداعی و درجای محفظه استوانه‌ای و پیچش استفاده شده است. دستگاه مرتبط با آزمون‌های مذکور بسیار ساده، قابلیت تکرار و قابل استفاده در محل پروژه می‌باشند. نتایج آزمایش‌ها نشانگر دقت بالای مدل تئوری معرفی شده جهت اندازه‌گیری نرخ نفوذ آب در بتن می‌باشد. همچنین اختلاف بسیار اندکی بین نتایج آزمایشگاهی با نتایج حاصل از تئوری مشاهده شد. با استفاده از آزمون پیچش نیز می‌توان بدون شکستن نمونه مقدار مقاومت فشاری بتن را با ضریب تعیین حدود 95 درصد ارزیابی نمود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Application of innovative tests of twist-off and cylindrical chamber and development of a new theoretical model to measure the rate of water penetration in concrete

نویسندگان English

Ali Saberi Vaezaneh 1
Mahmood Naderi 2
sardarwali din 3
1 Ph.D, Civil Engineering Faculty, Imam Khomeini International University, Qazvin, Iran.
2 Professor, Department of Civil Engineering, Imam Khomeini International University, Qazvin, Iran
3 Ph.D student,. Civil Engineering Faculty, Imam Khomeini International University, Qazvin, Iran.
چکیده English

The mechanical characteristics and reliability of concrete are directly related to the structural characteristics of the microscopic pores of concrete. Considering that in Euclidean geometry, all dimensions are integers, therefore, the structure of microscopic pores cannot be defined by it. Therefore, in this article, passing the limitations such as one-dimensional and two-dimensional, etc., a new theory has been presented that expresses the real characteristics of complex systems. Dimension length of complexity and surface area of pores are important characteristics of the mentioned model. Also, by examining the valid international standards, it can be seen that laboratory devices are needed to measure the permeability of concrete and it is not possible to evaluate the permeability at the project site. For this reason, there is a need to introduce and use new and in-situ tests to measure the permeability and strength of concrete. In this article, to measure the rate of water penetration into concrete as well as the surface resistance of concrete, innovative and in-situ tests of cylindrical chamber and twist-off have been used. The devices related to the mentioned tests are very simple, repeatable and can be used at the project site. The results of the tests show the high accuracy of the introduced theoretical model for measuring the rate of water penetration in concrete. Also, a very small difference between the laboratory results and the theoretical results was observed. By using the twist-off test, it is possible to evaluate the compressive strength of concrete without breaking the sample with a coefficient of determination of about 95%.

کلیدواژه‌ها English

Twist-off
Rate of water penetration
Theoretical model
Cylindrical chamber
Concrete
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  • تاریخ دریافت 03 اردیبهشت 1403
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