بررسی تأثیر شرایط تر و خشک شدن مداوم بر استقامت کانال آبی شهرستان ورزنه

صابری ورزنه, علی; نادری, محمود

doi:10.22093/wwj.2025.529392.3498

بررسی تأثیر شرایط تر و خشک شدن مداوم بر استقامت کانال آبی شهرستان ورزنه

نوع مقاله : مقاله پژوهشی

نویسندگان

علی صابری ورزنه ¹

محمود نادری ²

¹ پژوهشگر پسا دکترا، گروه عمران، دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران

² استاد، گروه عمران، دانشکده دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران

10.22093/wwj.2025.529392.3498

چکیده

ارزیابی دوام کانال‌های آب‌رسانی، به‌ویژه در شرایط حاد محیطی مانند تر و خشک شدن‌، اهمیت زیادی دارد. علاوه بر این، توسعه آزمون‌های درجا که امکان ارزیابی سریع و مقرون‌به‌صرفه سازه‌ها را بدون نیاز به تخریب بتن فراهم کند، دارای نقش حیاتی است. در این پژوهش اثرات شرایط تر و خشک مداوم بر نفوذپذیری بتن و عملکرد کانال آب‌رسانی شهر ورزنه بررسی شد. برای اندازه‌گیری نفوذپذیری بتن، از روش "محفظه استوانه‌ای" استفاده شد که قابلیت اندازه‌گیری درجا و غیرمخرب نفوذپذیری بتن را دارد. نتایج نشان داد که در اثر شرایط تر و خشک، نفوذپذیری بتن به‌طور چشمگیری افزایش یافته است. برای شبیه‌سازی رفتار بدنه بتنی کانال، اقدام به ساخت نمونه‌های بتنی در آزمایشگاه شد و تأثیر چرخه‌های مختلف تر و خشک شدن مداوم بر نفوذپذیری بررسی شد. همچنین با استفاده از بررسی ریز ساختاری بتن، تأثیر شرایط فوق بررسی شد. نتایج حاصله بیانگر افزایش نفوذپذیری بتن تحت شرایط تر و خشک شدن به مقدار حدود 17درصد بود که تأثیر به‌سزایی بر افت استحکام بدنه بتنی کانال داشت. همچنین با استفاده از نمودارهای سه‌بعدی، رابطه بین مقاومت فشاری با پارامترهای نفوذپذیری تعیین شد. عمل‌آوری مناسب نیز باعث کاهش حدود 20 درصدی ترک‌های جمع‌شدگی بتن شد.

کلیدواژه‌ها

چرخه‌های تر و خشک

کانال

نفوذپذیری

بتن

عنوان مقاله English

Investigation of the Effect of Continuous Wetting and Drying Cycles on the Durability of the VarzanehWater Channel

نویسندگان English

Ali Saberi Varzaneh ¹

Mahmood Naderi ²

¹ Postdoc Researcher, Faculty of Civil Engineering, Imam Khomeini International University, Qazvin, Iran

² Prof., Faculty of Civil Engineering, Imam Khomeini International University, Qazvin, Iran

چکیده English

Assessment of water conveyance channel durability, particularly under severe environmental conditions such as wetting and drying cycles, is of considerable importance. Moreover, the development of in-situ testing methods that enable rapid and cost-effective evaluation of structures without the need for concrete destruction plays a crucial role. In this study, the effects of continuous wetting and drying conditions on the permeability of concrete and the performance of the Varzaneh water conveyance channel were investigated. These conditions have resulted in significant water loss and reduced water transmission capacity. Considering that the methods introduced in international standards are generally destructive and only applicable in laboratory environments, the Cylindrical Chamber method was used in this research to measure concrete permeability. This method enables non-destructive, in-situ permeability measurement of concrete. The results indicated that the permeability of concrete increased significantly under wet-dry cycling conditions. To simulate the behavior of the canal’s concrete lining, laboratory concrete specimens were prepared, and the effects of various cycles of continuous wetting and drying on permeability were examined. Additionally, microstructural analysis of the concrete was performed to assess the impacts of these conditions. The findings revealed that wetting and drying conditions led to an approximate 17% increase in concrete permeability, which significantly compromises the integrity of the channel’s concrete body. Furthermore, three-dimensional plots were utilized to establish the relationship between compressive strength and permeability parameters. Proper curing was also found to reduce shrinkage cracks in concrete by about 20%. Therefore, to maintain optimal channel performance, it is essential to implement preventive measures and appropriate repairs.

کلیدواژه‌ها English

Wetting and Drying Cycles

Water Conveyance Channel

Permeability

Concrete

Cylindrical Chamber

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