بررسی خواص رئولوژی بتن خودتراکم با استفاده از نمودارهای رئوگراف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد تهران‌جنوب

2 دانشجوی دکتری مهندسی و مدیریت ساخت دانشگاه آزاد اسلامی واحد تهران‌جنوب

10.22124/jcr.2022.18430.1473

چکیده

بتن خودتراکم در برابر تغییرات زمان، دما و مصالح نسبت به بتن معمولی دارای حساسیت بیشتری می‌باشد. این موضوع به علت ترکیبی از نیازهای متنوع بتن خودتراکم در حالت تازه می‌باشد. رئولوژی اطلاعات ارزشمندی در مورد خصوصیات بتن تازه خودتراکم ارائه می‌دهد، ولی چگونگی دستیابی به بتن بهینه خودتراکم با استفاده از نمودارهای رئوگراف، می‌تواند اطلاعات کاربردی را سبب شود. در این تحقیق بتن‌های خودتراکم با مقادیر متفاوت سیمان، پودرسنگ، افزودنی اصلاح‌کننده لزجت و انواع فوق‌روان‌کننده‌ تحت شرایط محیطی مختلف ساخته شده است و به عبارتی برای اندازه‌گیری خواص رئولوژی، دمای مخلوط‌های بتن خودتراکم با توجه به شرایط محیطی فصل‌های مختلف انتخاب شده است. ازاین‌جهت، برای انجام آزمایش‌های کارایی و رئولوژی، ساخت نمونه‌ها در فصل‌های مختلف سال به انجام رسید. در این پژوهش با استفاده از نمودارهای رئوگراف، خواص رئولوژی اجزای بتن خودتراکم در طول زمان 60 دقیقه مورد بررسی قرار گرفت. بر اساس نتایج به‌دست‌آمده، استفاده از فوق‌روان‌کننده پلی‌کربوکسیلات نسبت به فوق‌روان‌کننده نفتالین سولفونات، رئولوژی بتن خودتراکم را بهبود می‌بخشد. از سوی دیگر، افزایش سیمان تا 440 کیلوگرم بر مکعب در بتن‌های خودتراکم حاوی اصلاح-کننده لزجت، سبب بهبود رئولوژی می‌شود. بتن‌های با افزودنی اصلاح‌کننده لزجت، 50 درصد افت جریان اسلامپ کمتری نسبت به بتن-های پودری دارند بنابراین برای دمای بالا، بتن‌های پودری توصیه نمی‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of Rheological Properties of Self-Compacting Concrete Using Rheographs

نویسندگان [English]

  • Seyyed Azim Hosseini 1
  • ali zal nezhad 2
1 Assistant Professor, School of Civil Engineering, Islamic Azad University, South Tehran Branch
2 PhD student in Construction and Management Engineering, Islamic Azad University, South Tehran Branch
چکیده [English]

Basically, self-compacting concrete mixtures (SCC) are more susceptible to temperature, time, and ingredients compared to the conventional ones. This matter is because of the combination of varied needs in the fresh mode, extremely complexed mixture proportions, and its naturally low yield stress. The rheology provides valuable information about the properties of fresh self-compacting concrete (SCC), but investigation of the procedure for achieving optimal SCC mix using the so-called rheographs can further provide practically useful information. In the present research, having their properties functions of temperature and mixing time, SCC samples were prepared with different amounts of cement, limestone, viscosity-modifying admixture and superplasticizer. In order to measure the rheological properties of the prepared samples, the SCC mix temperature was adjusted according to the dominant environmental conditions in different seasons. Accordingly, the samples were prepared during different seasons of the year to check for their workability and rheology. Rheographs were used to investigate the rheological properties of the SCC mixes during a period of 60 min. According to the results, the use of polycarboxylate superplasticizer and increasing the amount of cement at a given water-to-cement ratio were found to improve the rheological properties of the resultant concrete mix. increasing Portland cement to 440 kg/m3 in SCC mixtures containing viscosity modifying admixtures (VMA) improved rheology. On the other hand, the powder type SCC mixtures had 50% more slump loss compared to VMA type SCC mixtures. Therefore, the powder concrete is not recommended for high-temperature operating conditions.

کلیدواژه‌ها [English]

  • temperature
  • cement
  • limestone
  • viscosity-modifying admixture
  • superplasticizer

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تحقیقات بتن
دوره 15، شماره 1 - شماره پیاپی 37
فروردین 1401
صفحه 109-121

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