بررسی رسانایی هیدرولیکی و گرفتگی بتن های نفوذپذیر سبک حاوی لیکا و اسکوریا

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
کمیل مومنی 1
رضا قویدل 2
1 استادیار، گروه مهندسی عمران دانشگاه فنی و حرفه ای، تهران، ایران
2 گروه عمران دانشگاه آزاد اسلامی واحد لشت نشاء
چکیده
بتن نفوذپذیر به بتنی گفته می شود که با توجه به تخلخل بالا امکان عبور آب با سرعت بالا را از درون خود امکان پذیر می سازد. رویه های آسفالتی و بتنی جاده ها هرچند قابلیت های سازه ای و دوام بالایی دارند ولی از نظر زیست محیطی و همچنین الودگی صوتی آسیب های زیادی را به محیط زیست انسان ها وارد می کنند. یکی از این مشکلات، عدم نفوذ آب حاصل از بارندگی به زمین می باشد، علاوه بر این جاری شدن آب باران موجب به وجود آمدن سیلاب در شهرها می شود که ممکن است خسارات مالی و جانی فراوانی را به همراه بیاورد.از سوی دیگر، آلودگی رواناب های سطحی به رس می تواند باعث ایجاد گرفتگی در تخلخل های موثر بتن نفوذپذیر شود که در نتیجه مهم ترین خصیصه این بتن را که نفوذپذیری بالا است، دچار مشکل می کند. در این تحقیق با بهره گیری از پوزولان دوده سیلیسی سعی شد تا علاوه بر نفوذپذیری بالا و گرفتگی کمتر، ویژگی های مکانیکی بهتری بدست اید. علاوه بر این با بهره گیری از سبکدانه های لیکا و اسکوریا وزن مخصوص بتن نفوذپذیر به طور محسوسی پایین آورده شد تا ضمن افزایش تخلخل داخلی و ساختاری به کاهش آلودگی های صوتی نیز کمک نماید. نتایج مشخص نمود که نمونه های حاوی لیکا عملکرد بهتری در آزمون های مکانیکی به دست می دهند. نمونه های حاوی سنگدانه اسکوریا تخلخل و نفوذپذیری در مقایسه با نمونه های حاوی لیکا دارند که هر دوی این خصوصیات از اهمیت بالایی در بتن نفوذپذیر برخوردار هستند. جایگزینی 10% از سیمان با دوده سیلیسی خصوصیات مکانیکی نمونه ها را بهبود بخشید. در تمام حالات، نمونه ها نفوذپذیری قابل قبولی را برای عبور سوسپانسیون های رسی حتی در غلظت های بالا (75 و 100 درصد) نشان دادند. اما اختلاف بین مخلوط 10% با آب فاقد رس چشمگیر بود در حالی که با افزایش غلظت، اختلاف رسانایی هیدرولیکی بسیار کمتر گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Investigation of hydraulic conductivity and clogging of light permeable concrete containing Leica and Scoria

نویسندگان English

KOMEIL MOMENI 1
Reza Ghavidel 2
1 Assistant Professor, Department of civil Engineering, Technical and Vocational TUV Tehran,Iran
2 Department of Civil Engineering, Islamic Azad University, Lasht Nasha Branch
چکیده English

Pervious concrete is a concrete that, given its high porosity, allows higher rates of water infiltration through it. Although asphalt and concrete pavements have high structural and durability capabilities, they have a considerable high impact on the environment in terms of environmental as well as acoustic noise production. One of these problems are the drastic decrease in rainwater penetration to the ground and the consequent flooding disasters in the cities, which can lead to significant financial and life damage. On the other hand, surface clay pollution runoff can lead to clogging and take negative impact at effective permeability of such concrete. Thus making the most important feature of this concrete, which is high permeability, would be accompanied by some difficulties. In this study, using silica fume, it’s been tried to make a permeable concrete in order to have desirable mechanical properties, high permeability and less clogging. In addition, with the use of leca and scoria lightweight aggregates, the specific gravity of pervious concrete was significantly reduced to help noise pollution reduction by increasing internal and structural porosity. The results showed that the samples containing leca has a better performance in mechanical tests. Specimens containing scoria aggregates have higher porosity and permeability, which both have high importance in pervious concrete. Replacing 10% of cement by silica fume improved the mechanical properties of the specimens. In all cases, the samples showed acceptable permeability for slurry passage even at high concentrations, but the difference between the 10% clay suspension compared to clay-free water was significant, while the hydraulic conductivity decrease rate was much lower with increasing the concentration of clay.

کلیدواژه‌ها English

Lightweight Concrete
Hydraulic Conductivity
Clogging
Porosity percentage
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مهندسی عمران مدرس
دوره 20، شماره 3
مهر و آبان 1399
صفحه 161-174