مطالعه تاثیر نوع سنگدانه بر مقاومت و نفوذپذیری بتن

نوع مقاله: علمی - پژوهشی

نویسندگان

1 استاد، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

2 کارشناس ارشد مهندسی عمران، مدیر گروه مهندسی عمران، آموزشکده فنی (پردیس وزارت راه و شهرسازی)، لوشان، ایران

3 کارشناس ارشد مهندسی سازه، گروه مهندسی عمران، واحد تاکستان، دانشگاه آزاد اسلامی، تاکستان، ایران

چکیده

نفوذ پذیری یکی از عوامل مهم و تاثیر گذار بر دوام بتن می‌باشد. از اینرو در این مقاله به بررسی تاثیر عواملی نظیر مقاومت بتن، جذب آب، چگالی و مقاومت سنگ بر نفوذ پذیری بتن پرداخته شد. در ساخت بتن‌های مورد مطالعه بطور مجزا از هشت نوع سنگ با ویژگی‌های متفاوت به نام‌های سیلیس، مرمریت، آندزیت، آهک، تراورتن، توف، توف متراکم و گرانیت استفاده گردید. همچنین جهت تعیین نفوذ پذیری بتن از روش ابداعی محفظه استوانه ای و برای تعیین مقاومت بتن و صخره سنگ از روش مقاومت فشاری تک محوره و روش ابداعی پیچش استفاده شد. نتایج بدست آمده نشان داد که ارتباط بین مقاومت و نفوذ پذیری بتن، با ضریب همبستگی بین تا ، بیش از ضریب همبستگی سایر عوامل مانند جذب آب، چگالی و مقاومت صخره با نفوذ پذیری بتن می‌باشد. همچنین بتن بدست آمده از سنگدانه‌های تراورتن دارای بیشترین و بتن بدست آمده از سنگدانه‌های گرانیت دارای کمترین مقدار نفوذ آب بوده و نفوذ پذیری بتن حاصل از سنگدانه‌های اندزیت و توف، با گذشت زمان مشابه می‌باشد. با مشاهده روند نفوذ آب در بتن، مشاهده شد که نفوذ پذیری بتن بدست آمده از سنگدانه آهک، 8/11 برابر نفوذ پذیری بتن بدست آمده از سنگدانه گرانیت می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Effect of kind of aggregate on strength and permeability of concrete

نویسندگان [English]

  • Mahmood Naderi 1
  • rezvan valibeigi 2
  • seyed mohammad mir safi 3
1 Professor, Department of Civil Engineering, Engineering Faculty, International Imam Khomeini University, Qazvin, Iran
2 MSc of Civil Engineering, Head of Civil Engineering Department., Technical College (Ministry of Road and Urban Development Campus), Lowshan, Iran
3 MSc of Structural Engineering, Department of Civil Engineering, Engineering Faculty, Takestan Branch, Islamic Azad University, Takestan, Iran
چکیده [English]

Permeability is one of the most important factors affecting in the durability of concrete. So in this article, the effect of concrete strength, water absorption, density and strength of rock on the permeability of concrete studied. In the Studied concrete used separately from eight type’s rock with different characteristics namely silica stone, marble, andesite, limestone, travertine, tuff, dense tuff, granite. To determine the permeability of concrete used “cylindrical chamber” method. Also, to study the strength of concrete and rock used the “Twist-off” and uniaxial compressive strength methods. The results shown that the relationship between concrete strength and permeability of concrete with correlation between 0.67 to 0.77 is over than the correlation of other factors such as water absorption, density and strength of rock. Also, the concrete made with the travertine aggregates had highest and the concrete made with the granite aggregates concrete had lowest amount of water permeability. The Concrete made with dense tuff and marble aggregates had the relatively similar conditions in the amount of water permeability. Also, studies show that the permeability of concrete resulted from andesite and tuff aggregates is similar. Permeability of The concrete made with limestone aggregates was 11.8 times of permeability of concrete made with granite aggregates.

کلیدواژه‌ها [English]

  • Permeability
  • Twist
  • Cylindrical chamber
  • water absorption
  • Parent rock

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