پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

ارزیابی اثر دوده سیلیس بر مشخصات نفوذ پذیری روسازی‌های بتنی حاوی الیاف

نوع مقاله : مقاله پژوهشی

نویسندگان
حسن زیاری 1
احسان سبحانی فرد 2
فریدون امیدی نسب 3
1 استاد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران
2 دانشجوی دکتری، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران
3 دانشیار، دانشگاه لرستان، خرم آباد، ایران
10.22034/tri.2023.384568.3132
چکیده
بهبود مشخصات مقاومتی و نفوذ پذیری مخلوط‌های بتنی مورد استفاده در روسازی‌های بتنی به منظور افزایش عملکرد و دوام این روسازی‌ها از اهمیت بالایی برخوردار است. در این میان، استفاده از مواد نوین به جهت بهبود این خصوصیات در روسازی‌های بتنی اهمیت می‌یابد. مواد افزودنی دوده سیلیس و الیاف ماکرو پلی پروپیلن از انواع مواد نوین در صنعت روسازی هستند. تحقیق حاضر به ارزیابی اثر دوده سیلیس بر مشخصات مقاومتی و نفوذ پذیری روسازی‌های بتنی هوادار حاوی الیاف ماکرو پلی پروپیلن در مقادیر مصرف مختلف پرداخته است. در همین راستا، دوده سیلیس در مقادیر مصرف 5 و 7.5 درصد و الیاف ماکرو پلی پروپیلن در مقادیر مصرف 0.9 و 1.8 کیلوگرم بر متر مکعب به مخلوط بتنی شاهد اضافه گردید. همچنین خصوصیات مقاومتی شامل مقاومت فشاری، کششی دو نیم شدن و خمشی و خصوصیات نفوذ پذیری شامل جذب آب و عمق نفوذ پذیری تحت فشار مخلوط‌های بتنی مطابق با روش‌های استاندارد ارزیابی شده است. نتایج حاکی از آن بود که دوده سیلیس باعث تغییر چشمگیر خصوصیات مقاومتی و نفوذ پذیری مخلوط‌های بتنی حاوی الیاف می‌گردد. با افزودن دوده سیلیس، مقاومت فشاری، کششی دو نیم شدن و خمشی بتن به ترتیب حداکثر تا میزان 44، 54 و 27 درصد افزایش یافت. همچنین دوده سیلیس باعث کاهش میزان جذب آب و عمق نفوذ پذیری حداکثر تا میزان 12 و 48 درصد گردید. میزان مصرف دوده سیلیس نیز تاثیر چشمگیری بر تغییر رفتار مقاومتی و نفوذ پذیری روسازی بتنی داشت. مشاهده گردید در بین خصوصیات مقاومتی، دوده سیلیس بیشترین تاثیر را بر مقاومت کششی دو نیم شدن و در بین خصوصیات نفوذ پذیری آن، بیشترین تاثیر را بر عمق نفوذ پذیری بتن داشته است. بعلاوه تغییر مقاومت فشاری بیشتر از مقاومت خمشی روسازی بتنی شده است.
کلیدواژه‌ها
الیاف ماکرو پلی پروپیلن
خصوصیات مقاومتی
دوده سیلیس
روسازی بتنی هوادار
نفوذ پذیری

موضوعات

عنوان مقاله English

Evaluation of the Effect of Silica Fume on the Permeability Characteristics of Concrete Pavements Containing Fibers

نویسندگان English

Hassan Ziari 1
Ehsan Sobhanifard 2
Fereydoon Omidinasab 3
1 Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
2 Ph.D., Student, School of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
3 Associate Profeesor, Department of Engineering, Lorestan University, KhoramAbad, Lorestan, Iran.
چکیده English

It is very important to improve the strength and permeability characteristics of concrete mixtures used in concrete pavements in order to increase the performance and durability of these pavements. Meanwhile, the use of new materials to improve these characteristics in concrete pavements becomes important. Silica fume and polypropylene macro fibers are among the types of new materials in the pavement industry. The present research has evaluated the effect of silica fume on the resistance and permeability characteristics of air-entrained concrete pavements containing macro polypropylene fibers in different amounts. In this regard, silica fume in consumption amounts of 5% and 7.5% and polypropylene macro fibers in consumption amounts of 0.9 kg/m3 and 1.8 kg/m3 were added to the reference concrete mixture. Also, the strength properties including compressive, splitting tensile and flexural strength and permeability properties including water absorption and penetration depth under the pressure of concrete mixtures have been evaluated according to standard methods. The results indicated that silica fume significantly changes the strength and permeability properties of concrete mixtures containing fibers. With the addition of silica fume, the compressive, tensile, and flexural strength of concrete increased to 44%, 54%, and 27%, respectively. Also, silica fume decreased the amount of water absorption and penetration depth up to 12 and 48 percent. The consumption of silica fume also had a significant effect on the change in the strength behavior and permeability of the concrete pavement. It was observed that among the strength properties, silica fume had the greatest impact on the splitting tensile strength and among its permeability properties, it had the greatest impact on the penetration depth of concrete. In addition, the change in compressive strength is greater than the flexural strength of the concrete pavement.

کلیدواژه‌ها English

Polypropylene Macro Fibers‌
Resistance Characteristics
Silica Fume
Air-Entrained Concrete Pavements‌
Permeability
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