بررسی دوام و مقاومت فشاری بتن با استفاده از افزودنی‌های الیاف پلی‌پروپیلن، پلی-کربوکسیلات اتر و ‌ E205

نوع مقاله : علمی - پژوهشی

نویسندگان

1 عضو هیئت علمی دانشگاه آیت اله العظمی بروجردی

2 گروه عمران، دانشگاه بروجرد

چکیده

امروزه پژوهشگران در تلاشند تا با بهره‌گیری از مواد افزودنی، خواص مکانیکی و دوام بتن را به‌طور همزمان افزایش دهند. در این پژوهش، نتایج آزمایشگاهی تأثیر اختلاط بتن با درصدهای مختلف مواد افزودنی پلی‌کربوکسیلات اتر و ماده E205 به طور جداگانه بر روی بتن الیافی مسلح شده با الیاف پلی‌پروپیلن مورد بررسی قرار گرفته است. در این راستا از آزمایش‌های دوام شامل آزمایش-های مقاومت ویژه الکتریکی، جذب آب حجمی، نفوذ تسریع شده یون کلر(RCPT) و همچنین مقاومت فشاری بتن مورد بررسی قرار گرفته است. به علاوه، جهت مطالعه ریزساختار خمیر سیمان حاوی الیاف پلی‌‌پروپیلن و مواد افزودنی پلی‌کربوکسیلات اتر و افزودنی E205 از آزمایش‌های طیف سنجی تفرق اشعه ایکس(XRD)، تصاویر میکروسکوپ الکترونی روبشی(SEM) و آزمون ترکیب شیمیایی به روش XRF استفاده شده است. نتایج بدست آمده نشان می‌دهد که اضافه کردن افزودنی پلی‌کربوکسیلات اتر و الیاف پلی‌پروپیلن(نمونه A) 51% و اضافه کردن افزودنی E205 و الیاف پلی‌پروپیلن(نمونهB) 36% نفوذ تسریع شده یون کلر را نسبت به نمونه شاهد کاهش می‌دهد، جذب آب حجمی بتن در نمونه‌های A ،27 % و در نمونه‌های B به مقدار 16% نسبت به نمونه شاهد کاهش یافت، همچنین مقاومت ویژه الکتریکی بتن نسبت به نمونه شاهد در نمونه‌های A، 263 % و در نمونه هایB ، 310 % افزایش یافت. مقاومت فشاری در نمونه‌های A درسن 7 و 28 روزه به ترتیب 134% و56% نسبت به نمونه شاهد افزایش یافته است و بیشترین مقاومت فشاری در نمونه‌های B در سن 7 و 28 روزه به ترتیب 43% و 29% نسبت به نمونه شاهد افزایش یافته است. با توجه به نتایج ذکر شده می‌توان نتیجه گرفت که دوام و مقاومت فشاری بتن الیافی مسلح شده با الیاف پلی‌پروپیلن با اضافه کردن مواد افزودنی پلی‌کربوکسیلات اتر و ماده E205 افزایش می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of durability and compressive strength of concrete using polypropylene, E205 and polycarboxylate ether additives

نویسندگان [English]

  • Mehdi Komasi 1
  • Mohamadreza Piryaei 2
1 Department of Civil Engineering, Faculty of Engineering, University of Ayatollah ozma Borujerdi, Borujerd, Iran
2 Civil Engineering -Boruojerd University
چکیده [English]

Nowadays researchers are trying to simultaneously enhance the mechanical properties and durability of concrete using additives. In this study, the experimental results of the effect of admixture concrete with different percentages of polycarboxylate ether and E205 additives were investigated separately on fiber reinforced concrete with polypropylene fibers. In this regard, durability tests including electrical resistivity tests, water absorption, rapid choloride permeability test (RCPT) and compressive strength of concrete have been investigated. In addition, to study the microstructure of cement paste containing polypropylene fibers and polycarboxylate ether additives and E205 additives were used, X-ray diffraction spectroscopy (XRD) experiments, scanning electron microscopy (SEM) images and XRF chemical composition test. The results show that adding additives to the concrete admixture, reduced compared to the control sample 51% chlorine ion penetration in concrete with polycarboxylate ether and polypropylene fibers (sample A) and 36% chlorine ion penetration with E205 additive. Water absorption was reduced in samples A 27% and in samples B, 16% compared to the control sample, also the increase in specific electrical resistivity compared to the control sample was 525% in samples A and 619% in samples B. Also, the compressive strength of samples at 7 and 28 days of age increased by 134% and 56%, respectively, and the highest compressive strength in samples B at 7 and 28 days were 43% and 29%, respectively. Control sample increased. According to the results, it can be concluded that the durability and compressive strength of fibers reinforced with polypropylene fibers is increased by adding polycarboxylate ether and E205 additives.

کلیدواژه‌ها [English]

  • Durability
  • specific electrical resistivity
  • polycarboxylate ether
  • RCPT
  • E205
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